CN110442560A - Method, apparatus, server and storage medium are recurred in a kind of log - Google Patents
Method, apparatus, server and storage medium are recurred in a kind of log Download PDFInfo
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/10—File systems; File servers
- G06F16/18—File system types
- G06F16/1805—Append-only file systems, e.g. using logs or journals to store data
- G06F16/1815—Journaling file systems
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/10—File systems; File servers
- G06F16/18—File system types
- G06F16/182—Distributed file systems
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
- G06F16/28—Databases characterised by their database models, e.g. relational or object models
- G06F16/284—Relational databases
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Abstract
The embodiment of the invention discloses a kind of logs to recur method, apparatus, server and storage medium, wherein this method is applied to primary database, this method comprises: if it is determined that when current database example modifies target data page for the first time, generation is redo log, and is redo log wherein redoing log and synchronizing to redo log including page with conventional；Transmission is redo log to standby database, so that standby database root carries out log recurrence according to the Log Types redo log.The technical solution of the embodiment of the present invention, primary database is when generation is redo log, by increase a kind of new page synchronize redo log redo log type, standby database can be made not need additional logic judgment, according to Log Types can parallel processing page synchronize redoing log except redoing log, greatly improve the recurrence efficiency and performance of standby database.
Description
Technical field
The present embodiments relate to database technical field more particularly to a kind of log recur method, apparatus, server and
Storage medium.
Background technique
Relational database management system is usually used to reform (REDO) log to guarantee the persistence of affairs, any modification number
According to operation, can all generate REDO log in internal system, and after ensuring REDO log brush, the data page of modification is just written
Disk.Log serial number (Log Sequence Number, LSN) is one of relational database management system internal maintenance
BIGINT Type Value, for identifying REDO log recording, each LSN value represents a system inside relational database management system
The set of column modification data manipulation.
In the single-node data library database of a database instance (include), LSN value, which has, to be increased continuously and global
Unique characteristic, when data modification generates REDO log, system can distribute a LSN value, and the size of LSN value represents data and repairs
The sequencing changed.When the system failure is restarted, REDO log is successively reformed according to LSN value from small to large, so that it may in strict accordance with
The modification sequence of data, the state before restoring data to the system failure.Shared storing data library cluster may include multiple numbers
According to library example, user can connect any database example starting affairs, modifies data and generates REDO log, each database
Example independent maintenance log information, the LSN value inside database instance, which also has, is increased continuously characteristic, unique trait.For area
Divide the sequencing of modification, it is ensured that the LSN value that the same data page of disparate databases example modifications generates is incremental.Therefore,
The LSN value of each data instance is not necessarily continuously in shared storing data library cluster, does not also have uniqueness.
Data guardian system is the current relatively common solution for database high availability, usually by a master
Database (i.e. the host of database) and one or several for database (i.e. the standby host of database) composition.Standby database is logical
Cross the REDO log that recurrence primary database generates keeps data synchronous with primary database.Inside data guardian system, if main
Database is shared storing data library cluster, then will receive the REDO day that multiple database instances send over for database
Will, in order to guarantee data consistency, it is necessary to REDO log successively be reformed according to LSN value from small to large, otherwise can destroy data
Correctness.In the prior art, a kind of feasible method is after receiving the REDO log of primary database, by the REDO log of multichannel
REDO log is successively recurred again after merger sequence, but this method has the following problems: because of multiple data in primary database
The REDO log of library example be it is independent, after standby database receives the REDO log of data instance generation, need clear
Know whether other database instances produce REDO log, be otherwise unable to complete merger sequence, and standby database need by
It is recurred again after multichannel REDO log merger sequence, treatment effeciency is unable to meet demand, and repeatability can be guaranteed.
Summary of the invention
The embodiment of the present invention provides a kind of log and recurs method, apparatus, server and storage medium, to optimize in database
Scheme is recurred in the log of standby host, is improved log and is recurred efficiency.
In a first aspect, the embodiment of the invention provides a kind of logs to recur method, it is applied to primary database, comprising:
If it is determined that generation is redo log when current database example modifies target data page for the first time, wherein described
It redoes log to synchronize to redo log including page and be redo log with conventional；
It is redo log described in transmission to standby database, so that the Log Types that the standby database root is redo log described in
Carry out log recurrence.
Second aspect, the embodiment of the invention also provides a kind of logs to recur method, is applied to standby database, comprising:
Obtain redoing log for primary database transmission；
According to the Log Types redo log, log recurrence is carried out to described redo log, it is described to redo log packet
It includes page and synchronizes and redo log and conventional redo log.
The third aspect, the embodiment of the invention also provides a kind of logs to recur device, is configured at primary database, comprising:
Log generation module, for if it is determined that being generated when current database example modifies target data page for the first time
Redo log, wherein it is described redo log to synchronize including page redo log and conventional redo log；
Log sending module, for send it is described redo log to standby database so that described in the standby database root evidence
The Log Types redo log carry out log recurrence.
Further, the log generation module includes modifying determination unit for the first time, the determination unit tool of modification for the first time
Body is used for:
If it is determined that target data page brush, alternatively, upper one in the non-brush of the target data page and global buffer
The corresponding database instance of modification record is different from the current database example, it is determined that the current database example is to institute
Target data page is stated to be modified for the first time.
Further, the log generation module includes that page synchronizes and redoes log unit, and the page, which synchronizes, redoes log list
Member is specifically used for:
Page log serial number of the target data page before the modification for the first time is determined as synchronization log sequence number,
Described in synchronization log sequence number increments and unique；
Upper modification note based on the synchronization log sequence number and the target data page before the modification for the first time
Corresponding database instance is recorded, the page is generated and synchronizes and redo log.
Further, described device further include:
Conventional log module, for if it is determined that the current database example non-repair for the first time to the target data page
When changing, conventional redo log is generated.
Fourth aspect, the embodiment of the invention also provides a kind of logs to recur device, is configured at standby database, comprising:
Log acquisition module, for obtaining redoing log for primary database transmission；
Module is recurred in log, and the Log Types for redoing log according to carry out log weight to described redo log
Drill, it is described redo log to synchronize including page redo log and conventional redo log.
Further, the log recurrence module includes:
First recur unit, if for it is described redo log to synchronize for the page redo log, day is reformed according to
The synchronization log sequence number of will and the comparison result for recurring completion log serial number carry out log recurrence to described redo log.
Further, the first recurrence unit is specifically used for:
If described recur completes log serial number less than the synchronization log sequence number redo log, waiting behaviour is executed
Make, until described recur completes log serial number more than or equal to the synchronization log sequence number redo log.
Further, the log recurrence module includes:
Second recurs unit, if redoing log for described redo log for the routine, parallel to the conventional weight
It does log and carries out log recurrence, wherein the quantity routinely redo log is at least one.
5th aspect, the embodiment of the invention also provides a kind of server, the server includes:
One or more processors；
Storage device, for storing one or more programs；
When one or more of programs are executed by one or more of processors, so that one or more of processing
Device realizes that method is recurred in log as described in relation to the first aspect, or method is recurred in the log as described in second aspect.
6th aspect, the embodiment of the invention also provides a kind of computer readable storage mediums, are stored thereon with computer
Program realizes that method is recurred in log as described in relation to the first aspect when the program is executed by processor, or as described in second aspect
Log recur method.
The embodiment of the present invention is determining that current database example modifies target data page for the first time by primary database
When, generation is redo log, and transmission is redo log to standby database, so that standby database root is carried out according to the Log Types redo log
Log is recurred, and is redo log wherein redoing log and synchronizing to redo log including page with conventional.The technical solution of the embodiment of the present invention,
Primary database when generation is redo log, by increase a kind of new page synchronize redo log redo log type, can make
Standby database does not need additional logic judgment, according to Log Types can parallel processing page synchronize the weight except redoing log
Log is done, the recurrence efficiency and performance of standby database are greatly improved.
Detailed description of the invention
Fig. 1 is the flow chart of the log recurrence method in the embodiment of the present invention one；
Fig. 2 is the schematic diagram of the data guardian system in the embodiment of the present invention one；
Fig. 3 is the flow chart of the data modification process in the embodiment of the present invention one；
Fig. 4 is the flow chart of the log recurrence method in the embodiment of the present invention two；
Fig. 5 is the structural schematic diagram of the log recurrence device in the embodiment of the present invention three；
Fig. 6 is the structural schematic diagram of the log recurrence device in the embodiment of the present invention four；
Fig. 7 is the structural schematic diagram of the server in the embodiment of the present invention five.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention rather than limiting the invention.It also should be noted that in order to just
Only the parts related to the present invention are shown in description, attached drawing rather than entire infrastructure.
Embodiment one
Fig. 1 is the flow chart of the log recurrence method in the embodiment of the present invention one, and the present embodiment is applicable to database
In redo log the case where carrying out log recurrence, this method can recur device by the log that is configured in primary database and hold
Row, which can be realized by the way of software and/or hardware, for example, the device is configured in server.
Fig. 2 is the schematic diagram of the data guardian system in the embodiment of the present invention one, which is only one and shows
The quantity of example, standby database can be multiple.Data guardian system in figure includes a primary database 101 and a standby data
Library 102, wherein primary database 101 is the shared storing data library cluster including two database instances, primary database 101
In include database instance 1 and database instance 2, each database instance individually generates and manages redoing log for itself.It is main
Database instance 1 and redoing log for database instance 2 can be sent in standby database 102 by database 101, standby database
102 can redo log progress log recurrence to what is received, realize and keep data synchronous with primary database 101.
Method is recurred to log with the data guardian system in Fig. 2 in the present embodiment to be illustrated.
As shown in Figure 1, this method can specifically include:
S110, if it is determined that when current database example modifies target data page for the first time, generation is redo log.
Wherein, to be relational database server provide the example of data service for user to database instance, and user can be with
The data service operation internal data therein provided by database instance.To the number for including in primary database in the present embodiment
It is not construed as limiting according to the quantity of library example.Data page can be the basic unit of management memory space in database instance.It reforms
(REDO) log may include page synchronize redo log and it is conventional redo log, it is a kind of newly-increased reform that page, which is synchronized and redo log,
Log Types, page, which is synchronized and is redo log, to be the last modification relevant information before currently modify for data page
Log recording, page synchronizes redo log in synchronization log sequence number increments and unique.
Further, it determines that current database example modifies target data page for the first time, may include: if it is determined that mesh
Data page brush is marked, alternatively, the corresponding database instance of a upper modification record in the non-brush of target data page and global buffer
It is different from current database example, it is determined that current database example modifies target data page for the first time.Wherein brush is
Finger stores target data page into disk.
By inquiry global buffer in brush record, can determine target data page whether brush, however, it is determined that number of targets
According to page brush, it is determined that other database instances except current database example modify to the target data page
And brush, it needs to load newest target data page from disk, thus may determine that current database example is to current newest
Target data page modification for the first time.Or, however, it is determined that the non-brush of target data page can then inquire the modification in global buffer
Record.If a upper modification record corresponding database instance of the target data page in global buffer and current database example
Difference, the i.e. corresponding database instance of Last modification of the target data page before current database example modifications are not worked as
Preceding database instance can then determine that the target data page is modified by other database instances except current database example
It crosses, needs to obtain newest target data page from the corresponding database instance of the modification record, thus may determine that current number
According to the modification for the first time that library example is to current newest target data page.For example, database instance 1 has modified data page p1, still
Non- brush, the corresponding database instance of the upper modification record recorded in global buffer at this time (Last modification record) are number
According to library example 1, for the database instance other than database instance 1, then data page p1 is modified, as modified for the first time.
Further, generation page, which synchronizes, redoes log, and may include S111-S112 (not shown), specific:
S111, page log serial number of the target data page before modifying for the first time is determined as synchronization log sequence number.
Wherein, page synchronize redo log be it is a kind of it is newly-increased redo log type, synchronization log sequence number increments and unique,
Position in journal file can be before routinely redoing log.It may include mesh that page, which synchronizes and redoes log the content of middle record,
Mark file identification (ID), target data page page number, number of targets belonging to the mark (ID) of the affiliated table space of data page, target data page
According to the synchronization log sequence number of page newest place database instance number and target data page, wherein table space belonging to target data page
Mark can indicate that file identification belonging to target data page can be indicated using fil_id, target data page page using ts_id
Number can using page_no indicate, the newest place database instance number of target data page can using ep_se indicate, number of targets
It can be indicated using page_lsn according to the synchronization log sequence number of page.
It is available to be recorded in target data page before current database example modify for the first time to target data page
This page of log serial number is determined as synchronization log sequence number after modifying for the first time by the page log serial number on head.
S112, it is corresponded to based on the upper modification record of synchronization log sequence number and target data page before modifying for the first time
Database instance, generate page and synchronize and redoes log.
After determining synchronization log sequence number, however, it is determined that target data page brush does not know last modification target then
Which the database instance of data page is specifically, need at this time for all database example except current database example it is equal
It generates page to synchronize and redoes log, that is, generates multiple pages and synchronize and redo log.If it is determined that the non-brush of target data page, then can pass through
The modification record of target data page determines before current database example is modified for the first time in global buffer, and a upper modification record is corresponding
Database instance database instance number, the database instance number be the newest place database instance number of target data page,
A page is only generated at this time to synchronize and redo log.
Furthermore, it is desirable to determine file identification and target belonging to the mark of table space belonging to target data page, target data page
Data page page number.Based on table belonging to synchronization log sequence number, the newest place database instance number of target data page, target data page
File identification and target data page page number belonging to the mark in space, target data page, generate page and synchronize and redoes log.
Furthermore, however, it is determined that current database example to target data page carry out it is non-modify for the first time when, generate conventional reforms day
Will.When current database example carries out n-th modification to target data page, redoing log for generation only includes conventional reform day
Will, wherein N is the integer more than or equal to 2.
S120, transmission are redo log to standby database, so that standby database root carries out day according to the Log Types redo log
Will is recurred.
Specifically, this can be redo log after primary database generation is redo log and be sent to standby database, so that standby
Database root carries out log recurrence according to the Log Types redo log.It is redo log if redoing log and being synchronized for page, waits page
It synchronizes and redoes log the newest place database instance of target data page of middle record and recurred and then to current database example
Carry out log recurrence；It is redo log if redoing log to be conventional, log recurrence is directly carried out by parallel thread.Routine is reformed
The quantity of log can ensure that the performance of recurrence by parallel processing to be multiple.
In addition, using the page log serial number being recorded on data top margin in the present embodiment, dynamic modification system has been distributed
Max log sequence number, it can be ensured that each database instance generated when modifying identical data page page synchronize redo log in it is same
Log serial number is walked, has and is incremented by and unique characteristic.Therefore, page is synchronized and is redo log, it can be according to synchronization log sequence
The sequence of row number carries out log recurrence.
Fig. 3 is the flow chart of the data modification process in the embodiment of the present invention one, referring to Fig. 3, current number in primary database
The process modified according to library example to target data page is as follows: S11, initializing local log serial number.Initialize current number
It is 0 according to the local log serial number in the example of library, local log serial number can be indicated using PTX_LSN.S12, target is obtained
The modification authority of data page.S13, newest target data page is obtained.It is loaded by caching syncretizing mechanism from other examples or disk
Newest target data page.S14, modification target data page and generation are redo log.Current database example modifications target data page
And it generates page and synchronizes and redo log and conventional redo log.S15, judge whether page log serial number is greater than local logged sequence
Number.The page log serial number recorded on target data top margin before modifying is read, page log serial number can use PAGE_LSN table
Show, if PAGE_LSN > PTX_LSN, illustrates that other database instances modified the target data page, execute S16, otherwise hold
Row S17.S16, local log serial number is modified.PTX_LSN=PAGE_LSN+1 is set.S17, whether modify and terminate.If
PAGE_LSN≤PTX_LSN then illustrates to modify the target data page without other database instances, it is determined whether modification terminates,
If so, executing S18, otherwise returns and execute S12.S18, judge whether system distribution log serial number is less than local logged sequence
Number.Comparison system distributes log serial number and local log serial number, and system distribution log serial number can use CUR_LSN table
Show, if CUR_LSN < PTX_LSN, illustrates that other database instances modified the target data page, then execute S19, otherwise, such as
Up to the present fruit CUR_LSN >=PTX_LSN, is not yet modified after illustrating that target data page last change is complete, then holds
Row S20.S19, modification system distribute log serial number.CUR_LSN=PTX_LSN is set.S20, local log serial number is modified
Log serial number is distributed with system.PTX_LSN=CUR_LSN+1 is modified, new CUR_LSN is itself to add one.S21, page is determined
Log serial number.Page log serial number PAGE_LSN is equal with PTX_LSN.S22, the modification authority for discharging target data page.
One database instance is before modifying data page, it is ensured that first obtains the modification authority of data page, and obtains newest
Data page, after modifying data page, the page for generating database example, which synchronizes, to be redo log, while being read and being saved data top margin
The page log serial number of upper record saves most big page log serial number if modification is related to multiple data pages.Complete data page
After modification, the most big page log serial number being collected into is modified according to this, the currently allocated maximum system of adjustment system distributes day
Will sequence number redoes log sequence number to determine that page synchronizes the page redo log and synchronizes.
Illustratively, if in primary database including three database instances: database instance 1, database instance 2 and data
Library example 3, CUR_LSN=1000 in database instance 1, CUR_LSN=2000 in database instance 2, in database instance 3
CUR_LSN=3000.Database instance 1 modifies data page P1 (P1 first revision loads, PAGE_LSN=800 from disk),
PTX_LSN=801 is arranged after reading data page in initial setting up PTX_LSN=0, after the completion of data page P1 modification, modification CUR_
LSN=1001, PTX_LSN=1001 modify PAGE_LSN=1001, and two pages of generation are synchronized and redo log, respectively
(database instance 2,800), (database instance 3,800).Database instance 3 continues to modify data page P1, from database instance 1
PAGE_LSN=1001 is read, PTX_LSN=1002 is set, after the completion of data page P1 modification, modification CUR_LSN=3001,
PTX_LSN=3001, modification PAGE_LSN=3001.And generate a page synchronize redo log for (database instance 1,
1001).Database instance 2 continues to modify data page P1, reads PAGE_LSN=3001 from database instance 3, PTX_LSN is arranged
After the completion of=3002, data page P1 modification, PTX_LSN > CUR_LSN is found, modify CUR_LSN=3002, modify PAGE_LSN
=3002, and generation one is synchronized and is redo log as (database instance 3,3001).
The technical solution of the present embodiment is determining that current database example is first to the progress of target data page by primary database
When secondary modification, generation is redo log, and transmission is redo log to standby database, so that standby database root is according to the log class redo log
Type carries out log recurrence, redoes log wherein redoing log and synchronizing to redo log including page with conventional.In the present embodiment, master data
Library when generation is redo log, by increase a kind of new page synchronize redo log redo log type, standby data can be made
Library does not need additional logic judgment, according to Log Types can parallel processing page synchronize and reform day except redoing log
Will greatly improves the recurrence efficiency and performance of standby database.
Embodiment two
Fig. 4 is the flow chart of the log recurrence method in the embodiment of the present invention two.The present embodiment is applicable to database
In redo log the case where carrying out log recurrence, this method can recur device by the log being configured in standby database and hold
Row, which can be realized by the way of software and/or hardware, for example, the device is configured in server.Such as Fig. 4 institute
Show, the method for the present embodiment specifically includes:
S210, redoing log for primary database transmission is obtained.
Wherein, redo log may include that page synchronizes and redoes log and conventional redo log.
Whether S220, to redo log be that page is synchronized and redo log.
According to the Log Types redo log, log recurrence is carried out to redoing log, first determines the log class redo log
Type determines to redo log according to log content whether be that page is synchronized and redo log, if redoing log is that page is synchronized and redo log,
S230 is then executed, is redo log if redoing log to be conventional, executes S240.
S230, the comparison result that log serial number is completed according to the synchronization log sequence number and recurrence that redo log, counterweight
It does log and carries out log recurrence.
Standby database can be one recurrence task system of each primary database example allocation when carrying out log recurrence,
The recurrence task system can recorde the case where correspondence database example log is recurred.Completion log serial number is wherein recurred to attach most importance to
The newest log serial number that log recurrence is completed that task system is the storage of correspondence database example is drilled, can specifically be passed through
APPLY_LSN [ep_seqno] indicates that the recurrence that meaning is database instance ep_seqno completes log serial number and is
APPLY_LSN。
It is less than the synchronization log sequence number redo log if recurring and completing log serial number, executes waiting operation, until
It recurs and completes log serial number more than or equal to the synchronization log sequence number redo log.If standby database processing is to reforming
Page in log, which synchronizes, to be redo log, then may determine that recurrence complete log serial number whether be greater than or equal to redo log it is same
Log serial number is walked, is less than the synchronization log sequence number redo log if recurring and completing log serial number, database of descriptions is real
There are log serial numbers to be equal to redoing log for synchronization log sequence number by example ep_seqno, and current recurrence session can wait pending datas
The recurrence thread of library example ep_seqno carries out log recurrence, completes and log serial number is greater than or equal to and reforms day until recurring
The synchronization log sequence number of will, continues to recur.It is greater than or equal to the synchronization redo log if recurring and completing log serial number
Log serial number, then database of descriptions example ep_seqno had recurred the weight that log serial number is equal to synchronization log sequence number
Log is done, is withouted waiting for.
Illustratively, if database instance 2 generates database instance 1 page when modifying target data page, which synchronizes, is reformed day
Will, the routine that standby database first receives database instance 1 are redo log, then are received the page of database instance 2 and synchronized and reform
Log and it is conventional redo log, even if to recur speed fast for 2 thread of database instance under complications, encounter page and synchronize and reform day
Will judges that recurring completion log serial number synchronizes the synchronization log sequence number redo log less than page, then meeting of database instance 2 etc.
Pending data library example 1 recurs thread and recurs completion, is further continued for the recurrence itself routinely redo log.
If target data page brush, the page that standby database receives database instance 2, which synchronizes, to be redo log and conventional weight
Log is done, and recurs completion log serial number and synchronizes the synchronization log sequence number redo log less than page, but due to long-range
The principle of reading requirement log elder generation brush, it can be ensured that other database instances did not modify the target data page, counted at this time
It is withouted waiting for according to library example 2.
S240, log recurrence is carried out to conventional redo log parallel.
The quantity wherein routinely redo log is at least one.Standby database by parallel thread to it is conventional redo log into
Row log is recurred.
The technical solution of the present embodiment is redo log by what standby database obtained that primary database sends, according to reforming day
The Log Types of will carry out log recurrence to redoing log, and redo log to synchronize including page and redo log and conventional redo log.
In the present embodiment, due to include in redoing log a kind of new page synchronize redo log redo log type, standby database is not
Need additional logic judgment, directly can according to Log Types can parallel processing page synchronize reforming except redoing log
Log greatly improves the recurrence efficiency and performance of standby database.
Embodiment three
Fig. 5 is the structural schematic diagram of the log recurrence device in the embodiment of the present invention three, which recurs device and can set
It is placed in primary database, the present embodiment is applicable to redo log the case where carrying out log recurrence in database.The present invention is real
It applies log provided by example and recurs log recurrence method provided by the executable embodiment of the present invention one of device, have execution method
Corresponding functional module and beneficial effect.
The device specifically includes log generation module 310 and log sending module 320, in which:
Log generation module 310, for if it is determined that being given birth to when current database example modifies target data page for the first time
At redoing log, redo log wherein redoing log and synchronizing to redo log including page with conventional；
Log sending module 320 is redo log for sending to standby database, so that standby database root evidence was redo log
Log Types carry out log recurrence.
The technical solution of the present embodiment is determining that current database example is first to the progress of target data page by primary database
When secondary modification, generation is redo log, and transmission is redo log to standby database, so that standby database root is according to the log class redo log
Type carries out log recurrence, redoes log wherein redoing log and synchronizing to redo log including page with conventional.In the present embodiment, master data
Library when generation is redo log, by increase a kind of new page synchronize redo log redo log type, standby data can be made
Library does not need additional logic judgment, according to Log Types can parallel processing page synchronize and reform day except redoing log
Will greatly improves the recurrence efficiency and performance of standby database.
Further, log generation module 310 includes modifying determination unit for the first time, modifies determination unit for the first time and specifically uses
In:
If it is determined that target data page brush, alternatively, a upper modification record in the non-brush of target data page and global buffer
Corresponding database instance is different from current database example, it is determined that current database example carries out for the first time target data page
Modification.
Further, log generation module 310 includes that page synchronizes and redoes log unit, and page synchronizes that redo log unit specific
For:
Page log serial number of the target data page before modifying for the first time is determined as synchronization log sequence number, wherein synchronous day
Will sequence number increments and unique；
The corresponding data of a upper modification record based on synchronization log sequence number and target data page before modifying for the first time
Library example, generation page, which synchronizes, to be redo log.
Further, the device further include:
Conventional log module, for if it is determined that current database example to target data page carry out it is non-modify for the first time when, it is raw
It is redo log at conventional.
Device is recurred in log provided by the embodiment of the present invention can be performed the recurrence of log provided by the embodiment of the present invention one
Method has the corresponding functional module of execution method and beneficial effect.
Example IV
Fig. 6 is the structural schematic diagram of the log recurrence device in the embodiment of the present invention four, which recurs device and can set
It is placed in standby database, the present embodiment is applicable to redo log the case where carrying out log recurrence in database.The present invention is real
It applies log provided by example and recurs log recurrence method provided by the executable embodiment of the present invention two of device, have execution method
Corresponding functional module and beneficial effect.
The device specifically includes log acquisition module 410 and module 420 is recurred in log, in which:
Log acquisition module 410, for obtaining redoing log for primary database transmission；
Module 420 is recurred in log, for carrying out log recurrence to redoing log, weight according to the Log Types redo log
Doing log includes that page synchronizes and redoes log and conventional redo log.
The technical solution of the present embodiment is redo log by what standby database obtained that primary database sends, according to reforming day
The Log Types of will carry out log recurrence to redoing log, and redo log to synchronize including page and redo log and conventional redo log.
In the present embodiment, due to include in redoing log a kind of new page synchronize redo log redo log type, standby database is not
Need additional logic judgment, directly can according to Log Types can parallel processing page synchronize reforming except redoing log
Log greatly improves the recurrence efficiency and performance of standby database.
Further, log recurrence module 420 includes:
First recurs unit, if redoing log for redoing log to synchronize for page, according to the synchronization log redo log
Sequence number and the comparison result for recurring completion log serial number carry out log recurrence to redoing log.
Further, the first recurrence unit is specifically used for:
It is less than the synchronization log sequence number redo log if recurring and completing log serial number, executes waiting operation, until
It recurs and completes log serial number more than or equal to the synchronization log sequence number redo log.
Further, log recurrence module 420 includes:
Second recurs unit, if redoing log for redoing log to be conventional, carries out day to conventional redo log parallel
Will is recurred, wherein the quantity routinely redo log is at least one.
Device is recurred in log provided by the embodiment of the present invention can be performed the recurrence of log provided by the embodiment of the present invention two
Method has the corresponding functional module of execution method and beneficial effect.
Embodiment five
Fig. 7 is the structural schematic diagram of the server in the embodiment of the present invention five.Fig. 7, which is shown, to be suitable for being used to realizing the present invention
The block diagram of the exemplary servers 512 of embodiment.The server 512 that Fig. 7 is shown is only an example, should not be to the present invention
The function and use scope of embodiment bring any restrictions.
As shown in fig. 7, server 512 is showed in the form of generic server.The component of server 512 may include but not
Be limited to: one or more processor 516, storage device 528 connect different system components (including storage device 528 and processing
Device 516) bus 518.
Bus 518 indicates one of a few class bus structures or a variety of, including storage device bus or storage device control
Device processed, peripheral bus, graphics acceleration port, processor or total using the local of any bus structures in a variety of bus structures
Line.For example, these architectures include but is not limited to industry standard architecture (Industry Subversive
Alliance, ISA) bus, microchannel architecture (Micro Channel Architecture, MAC) bus is enhanced
Isa bus, Video Electronics Standards Association (Video Electronics Standards Association, VESA) local are total
Line and peripheral component interconnection (Peripheral Component Interconnect, PCI) bus.
Server 512 typically comprises a variety of computer system readable media.These media can be it is any being capable of bedding and clothing
The usable medium that business device 512 accesses, including volatile and non-volatile media, moveable and immovable medium.
Storage device 528 may include the computer system readable media of form of volatile memory, such as arbitrary access
Memory (Random Access Memory, RAM) 530 and/or cache memory 532.Server 512 can be further
Including other removable/nonremovable, volatile/non-volatile computer system storage mediums.Only as an example, storage system
System 534 can be used for reading and writing immovable, non-volatile magnetic media (Fig. 7 do not show, commonly referred to as " hard disk drive ").To the greatest extent
It is not shown in pipe Fig. 7, the disc driver for reading and writing to removable non-volatile magnetic disk (such as " floppy disk ") can be provided, with
And to removable anonvolatile optical disk, such as CD-ROM (Compact Disc Read-Only Memory, CD-ROM), number
Word optic disk (Digital Video Disc-Read Only Memory, DVD-ROM) or other optical mediums) read-write CD
Driver.In these cases, each driver can be connected by one or more data media interfaces with bus 518.
Storage device 528 may include at least one program product, which has one group of (for example, at least one) program module,
These program modules are configured to perform the function of various embodiments of the present invention.
Program/utility 540 with one group of (at least one) program module 542 can store in such as storage dress
It sets in 528, such program module 542 includes but is not limited to operating system, one or more application program, other program moulds
It may include the realization of network environment in block and program data, each of these examples or certain combination.Program module
542 usually execute function and/or method in embodiment described in the invention.
Server 512 can also be with one or more external equipments 514 (such as keyboard, direction terminal, display 524 etc.)
Communication, can also be enabled a user to one or more terminal interact with the server 512 communicate, and/or with make the clothes
Any terminal (such as network interface card, modem etc.) that business device 512 can be communicated with one or more of the other computing terminal
Communication.This communication can be carried out by input/output (I/O) interface 522.Also, server 512 can also be suitable by network
Orchestration 520 and one or more network (such as local area network (Local Area Network, LAN), wide area network (Wide Area
Network, WAN) and/or public network, such as internet) communication.As shown in fig. 7, network adapter 520 passes through bus 518
It is communicated with other modules of server 512.It should be understood that although not shown in the drawings, can be used in conjunction with server 512 other hard
Part and/or software module, including but not limited to: microcode, terminal driver, redundant processor, external disk drive array, magnetic
Disk array (Redundant Arrays of Independent Disks, RAID) system, tape drive and data backup
Storage system etc..
The program that processor 516 is stored in storage device 528 by operation, thereby executing various function application and number
According to processing, such as realize that method is recurred in log provided by any embodiment of the invention.
Embodiment six
The embodiment of the present invention six additionally provides a kind of computer readable storage medium, is stored thereon with computer program, should
Realize that method is recurred in log provided by any embodiment of the invention such as when program is executed by processor.
The computer storage medium of the embodiment of the present invention, can be using any of one or more computer-readable media
Combination.Computer-readable medium can be computer-readable signal media or computer readable storage medium.It is computer-readable
Storage medium for example may be-but not limited to-the system of electricity, magnetic, optical, electromagnetic, infrared ray or semiconductor, device or
Device, or any above combination.The more specific example (non exhaustive list) of computer readable storage medium includes: tool
There are electrical connection, the portable computer diskette, hard disk, random access memory (RAM), read-only memory of one or more conducting wires
(ROM), erasable programmable read only memory (EPROM or flash memory), optical fiber, portable compact disc read-only memory (CD-
ROM), light storage device, magnetic memory device or above-mentioned any appropriate combination.In this document, computer-readable storage
Medium can be any tangible medium for including or store program, which can be commanded execution system, device or device
Using or it is in connection.
Computer-readable signal media may include in a base band or as carrier wave a part propagate data-signal,
Wherein carry computer-readable program code.The data-signal of this propagation can take various forms, including but unlimited
In electromagnetic signal, optical signal or above-mentioned any appropriate combination.Computer-readable signal media can also be that computer can
Any computer-readable medium other than storage medium is read, which can send, propagates or transmit and be used for
By the use of instruction execution system, device or device or program in connection.
The program code for including on computer-readable medium can transmit with any suitable medium, including --- but it is unlimited
In wireless, electric wire, optical cable, RF etc. or above-mentioned any appropriate combination.
The computer for executing operation of the present invention can be write with one or more programming languages or combinations thereof
Program code, described program design language include object oriented program language-such as Java, Smalltalk, C++,
It further include conventional procedural programming language-such as " C " language or similar programming language.Program code can be with
It fully executes, partly execute on the user computer on the user computer, being executed as an independent software package, portion
Divide and partially executes or executed on remote computer or terminal completely on the remote computer on the user computer.It is relating to
And in the situation of remote computer, remote computer can pass through the network of any kind --- including local area network (LAN) or extensively
Domain net (WAN)-be connected to subscriber computer, or, it may be connected to outer computer (such as provided using Internet service
Quotient is connected by internet).
Note that the above is only a better embodiment of the present invention and the applied technical principle.It will be appreciated by those skilled in the art that
The invention is not limited to the specific embodiments described herein, be able to carry out for a person skilled in the art it is various it is apparent variation,
It readjusts and substitutes without departing from protection scope of the present invention.Therefore, although being carried out by above embodiments to the present invention
It is described in further detail, but the present invention is not limited to the above embodiments only, without departing from the inventive concept, also
It may include more other equivalent embodiments, and the scope of the invention is determined by the scope of the appended claims.
Claims (12)
1. method is recurred in a kind of log, which is characterized in that be applied to primary database, comprising:
If it is determined that generation is redo log when current database example modifies target data page for the first time, wherein described reform
Log includes that page synchronizes and redoes log and conventional redo log；
It is redo log described in transmission to standby database, so that the Log Types that the standby database root is redo log described in carry out
Log is recurred.
2. the method according to claim 1, wherein the determining current database example to target data page into
Row is modified for the first time, comprising:
If it is determined that target data page brush, alternatively, a upper modification in the non-brush of the target data page and global buffer
It is different from the current database example to record corresponding database instance, it is determined that the current database example is to the mesh
Mark data page is modified for the first time.
3. being redo log the method according to claim 1, wherein generating page and synchronizing, comprising:
Page log serial number of the target data page before the modification for the first time is determined as synchronization log sequence number, wherein institute
State synchronization log sequence number increments and unique；
A upper modification record pair based on the synchronization log sequence number and the target data page before the modification for the first time
The database instance answered, generates the page and synchronizes and redo log.
4. the method according to claim 1, wherein further include:
If it is determined that the current database example to the target data page carry out it is non-modify for the first time when, generate conventional reforms day
Will.
5. method is recurred in a kind of log, which is characterized in that be applied to standby database, comprising:
Obtain redoing log for primary database transmission；
According to the Log Types redo log, log recurrence is carried out to described redo log, it is described to redo log including page
It synchronizes to redo log and be redo log with conventional.
6. according to the method described in claim 5, it is characterized in that, according to the Log Types redo log, to described heavy
It does log and carries out log recurrence, comprising:
If it is described redo log to synchronize for the page redo log, the synchronization log sequence number redo log according to again
The comparison result for completing log serial number is drilled, log recurrence is carried out to described redo log.
7. according to the method described in claim 6, it is characterized in that, according to the synchronization log sequence number redo log and again
The comparison result for completing log serial number is drilled, log recurrence is carried out to described redo log, comprising:
If described recur completes log serial number less than the synchronization log sequence number redo log, waiting operation is executed,
Until described recur completes log serial number more than or equal to the synchronization log sequence number redo log.
8. according to the method described in claim 5, it is characterized in that, according to the Log Types redo log, to described heavy
It does log and carries out log recurrence, comprising:
If described redo log redoes log for the routine, the routine is redo log carry out log recurrence parallel,
Described in the quantity that routinely redoes log be at least one.
9. device is recurred in a kind of log, which is characterized in that be configured at primary database, comprising:
Log generation module, for if it is determined that generation is reformed when current database example modifies target data page for the first time
Log, wherein it is described redo log to synchronize including page redo log and conventional redo log；
Log sending module, for send it is described redo log to standby database, so as to be reformed described in the standby database root evidence
The Log Types of log carry out log recurrence.
10. device is recurred in a kind of log, which is characterized in that be configured at standby database, comprising:
Log acquisition module, for obtaining redoing log for primary database transmission；
Module is recurred in log, and the Log Types for redoing log according to carry out log recurrence, institute to described redo log
It states to redo log to synchronize to redo log including page and be redo log with conventional.
11. a kind of server, which is characterized in that the server includes:
One or more processors；
Storage device, for storing one or more programs；
When one or more of programs are executed by one or more of processors, so that one or more of processors are real
Method is recurred in the now log as described in any in claim 1-4, or realizes the log as described in any in claim 5-8
Recurrence method.
12. a kind of computer readable storage medium, is stored thereon with computer program, which is characterized in that the program is by processor
It realizes that method is recurred in the log as described in any in claim 1-4 when execution, or realizes such as institute any in claim 5-8
Method is recurred in the log stated.
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| CN113239120B (en) * | 2021-06-07 | 2023-08-18 | 上海达梦数据库有限公司 | Log synchronization method, device, equipment and storage medium |
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| CN115114370A (en) * | 2022-01-20 | 2022-09-27 | 腾讯科技（深圳）有限公司 | Synchronization method and device for master database and slave database, electronic equipment and storage medium |
| CN115114370B (en) * | 2022-01-20 | 2023-06-13 | 腾讯科技（深圳）有限公司 | Master-slave database synchronization method and device, electronic equipment and storage medium |
| CN114647624A (en) * | 2022-05-11 | 2022-06-21 | 成都云祺科技有限公司 | Method, system and storage medium for capturing database consistent point in block-level CDP |
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