CN108664635A - Acquisition methods, device, equipment and the storage medium of statistics of database information - Google Patents
Acquisition methods, device, equipment and the storage medium of statistics of database information Download PDFInfo
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Abstract
The embodiment of the invention discloses a kind of acquisition methods, device, equipment and the storage mediums of statistics of database information.The acquisition methods of the statistics of database information include：The statistical information of user is collected into instruction and is converted into corresponding SQL statement；Semantic analysis is carried out to the SQL statement, extracts the SELECT statement that can be executed by database；SELECT statement, which is executed, by database obtains the data acquisition system for meeting statistical information collection instruction；Data acquisition system is counted to obtain statistical information.The embodiment of the present invention greatly reduces waste and the run time of system resource, improving performance, while reducing implementation and maintenance difficulties.
Description
Technical field
The present embodiments relate to database technology more particularly to a kind of acquisition methods of statistics of database information, device,
Equipment and storage medium.
Background technology
In relevant database, statistical information is that the optimizer of database generates the necessary backman of optimal execution plan
Tool.Statistical information generally comprises the information such as number of data lines, data mean breadth, the number of different value, the distribution situation of value, optimization
Device judges influence situation of the filter condition in inquiry to data result set according to these information, and does different calculating operations
When system expense.
Currently, the usual way for obtaining statistical information is that scanning index (scans row statistical information on the aggregation rope of the table
Draw, which then scanned for the statistical information of index), all row of parsing index, then right from the data page read
These data such as are integrally ranked up, are grouped, analyzing at the processing, obtain such as number of data lines, data mean breadth, the number of distinct values
And the information such as distribution situation of value.
But as the increase of data scale, the operations such as scanning, parsing, the sequence of data may require that greatly in the above method
I/O, memory and the computing resource of amount, will also expend more and more times, especially in the unappeasable data rule of memory requirements
Under mould, brush operation is also had, these will all seriously affect the performance of statistical information generation.
Invention content
The embodiment of the present invention provides a kind of acquisition methods, device, equipment and the storage medium of statistics of database information, with big
The big waste for reducing system resource and run time, improving performance, while reducing implementation and maintenance difficulties.
In a first aspect, an embodiment of the present invention provides a kind of acquisition methods of statistics of database information, including：
The statistical information of user is collected into instruction and is converted into corresponding SQL statement；
Semantic analysis is carried out to the SQL statement, extracts the SELECT statement that can be executed by database；
The SELECT statement, which is executed, by the database obtains the data set for meeting the statistical information collection instruction
It closes；
Count to obtain statistical information to the data acquisition system, the statistical information include number of data lines, data mean breadth,
The number of different value and the distribution of different value.
Optionally, after the SELECT statement that extracts and can be executed by database, further include：
The SELECT statement is marked with keyword STAT.
Optionally, it is described the data acquisition system is counted to obtain statistical information after, further include：
Database System Tables are written into the statistical information.
Optionally, the statistical information by user collects instruction and is converted into corresponding SQL statement, including：
Extraction objects of statistics and sample rate in instruction is collected from the statistical information, according to the objects of statistics and described is adopted
The statistical information is collected instruction and is converted into the SQL statement by sample rate.
Second aspect, an embodiment of the present invention provides a kind of acquisition device of statistics of database information, including：
User instruction conversion module is converted into corresponding SQL statement for the statistical information of user to be collected instruction；
SQL processing modules, for carrying out semantic analysis to the SQL statement, extracting can be executed by database
SELECT statement；The SELECT statement, which is executed, by the database obtains the data for meeting the statistical information collection instruction
Set；
Data collection process module obtains statistical information for being counted to the data acquisition system, and the statistical information includes
The distribution of number of data lines, data mean breadth, the number of different value and different value.
Optionally, the SQL processing modules are additionally operable to that the SELECT statement is marked with keyword STAT.
Optionally, the data collection process module is additionally operable to statistical information Database System Tables are written.
Optionally, the user instruction conversion module is specifically used for collecting from the statistical information and extracts statistics in instruction
The statistical information is collected instruction according to the objects of statistics and the sample rate and is converted into the SQL by object and sample rate
Sentence.
The third aspect an embodiment of the present invention provides a kind of computer equipment, including memory, processor and is stored in
On reservoir and the computer program that can run on a processor, the processor realize such as above-mentioned first party when executing described program
The acquisition methods of any statistics of database information in face.
Fourth aspect, an embodiment of the present invention provides a kind of storage medium including computer executable instructions, the meters
Calculation machine executable instruction by computer processor when being executed for executing the database as described in any in above-mentioned first aspect
The acquisition methods of statistical information.
The embodiment of the present invention by using database execute SELECT statement, by database itself SQL optimizers and hold
Row device goes to complete the collection and processing of data, can not only utilize optimizer for the suitable index of its selection, can also utilize and hold
The existing optimization of row device itself and parallel processing, greatly reduce waste and the run time of system resource, improving performance, simultaneously
Reduce implementation and maintenance difficulties.
Description of the drawings
Fig. 1 is the flow chart of the acquisition methods for the statistics of database information that the embodiment of the present invention one provides；
Fig. 2 is the flow chart of the acquisition methods of statistics of database information provided by Embodiment 2 of the present invention；
Fig. 3 is the structural schematic diagram of the acquisition device for the statistics of database information that the embodiment of the present invention three provides；
Fig. 4 is a kind of structural schematic diagram for computer equipment that the embodiment of the present invention four provides.
Specific implementation mode
The embodiment of the present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this
The described specific embodiment in place is used only for explaining the embodiment of the present invention, rather than the restriction to the embodiment of the present invention.In addition also
It should be noted that illustrating only for ease of description, in attached drawing and the relevant part of the embodiment of the present invention rather than entire infrastructure.
Embodiment one
Fig. 1 is the flow chart for the acquisition methods of statistics of database information that the embodiment of the present invention one provides, and this method can be with
It is executed, is specifically comprised the following steps by computer equipment：
The statistical information collection instruction of user is converted into corresponding SQL statement by step 101；
Computer equipment collects extraction objects of statistics and sample rate in instruction from statistical information, according to objects of statistics and sampling
Statistical information is collected instruction and is converted into SQL statement by rate.For example, user needs to do sample rate to certain row C for belonging to certain table T and be
100% statistical information, user input statistical information and collect instruction：
STAT 100ON T(C)
Computer equipment converts thereof into SQL statement：
STAT 100ON SELECT C,COUNT(*),
SYSFUN_1(C),SYSFUN_2(C)..,SYSFUN_N(C)FROM T GROUP BY C ORDER BY C
Wherein STAT indicates that this is that a statistical information collects sentence, and 100 indicate that sample rate is that 100%, ON indicates statistics
The SELECT statement of data source later, in SELECT statement C be objects of statistics row, T be C belonging to table, SYSFUN_1,
SYSFUN_2.., SYSFUN_N is system-computed function, can be as needed for obtaining the information needed such as average data width
Addition is reduced, and GROUP BY C are data according to C column splits, and ORDER BY C are that data are arranged according to C and sorted, and COUNT (*) is indicated
The line number of data in every group.
Step 102 carries out semantic analysis to SQL statement, extracts the SELECT statement that can be executed by database；
Database itself can execute some sentences, can change to general additions and deletions and look into SQL statement progress morphology, language
Method, semantic analysis and execution, and not expanded database can identify " STAT 100ON SELECT... " this SQL statement
For the SQL statement of mistake, and the present embodiment Computer equipment carries out semantic analysis to the SQL statement that is converted to, extracts
The SELECT statement that can be executed by database can optionally be marked SELECT statement with keyword STAT.
Step 103, the data acquisition system for obtaining meeting statistical information collection instruction by database execution SELECT statement；
Database can carry out morphology, grammer, semantic analysis and execution, the present embodiment Computer to SELECT statement and set
It is standby that SELECT statement is executed by database, for example, database is according to the above-mentioned SELECT statement of conventional resolution, i.e. SELECT C,
COUNT (*), SYSFUN_1 (C), SYSFUN_2 (C) .., SYSFUN_N (C) FROM T GROUP BY C ORDER BY C, obtain
The data acquisition system instructed is collected to statistical information is met.It is noted that this SELECT statement will be common according to one
Query statement executes in the database, will be possible to use some existing optimisation techniques and processing module, if than in the presence of with
This is classified as first secondary index, can save the sorting operation in text-processing data, division operation by indexing scanning
Also it will greatly reduce the utilization of computing resource because data are drained through sequence；In addition this SELECT statement the result is that through excessive
Group, the value (need to only occur because of identical value after grouping primary) largely repeated can be removed under normal circumstances, this will subtract
Few many unnecessary data transfers, will also save the resource consumption of subsequent processing, this is not only able to be multiplexed existing ripe mould
Block (the SQL processing modules in legacy data library), and optimal mode will be used to scan and arrange data on the whole, it carries significantly
Rise the overall performance that statistical information generates.
Step 104 counts to obtain statistical information to data acquisition system, statistical information include number of data lines, data mean breadth,
The number of different value and the distribution of different value.
Computer equipment ergodic data set therefrom gets statistical information and (includes at least the average width of number of data lines, data
The distribution of degree, the number of different value and different value), and statistical information is written in Database System Tables.Due to data acquisition system
It is that have passed through grouping and sequence processing according to normal queries sentence, so obtaining these statistical informations will be than traditional statistical information
Gathering method is much easier, also quickly much.
The technical solution of the present embodiment executes SELECT statement by using database, is optimized by the SQL of database itself
Device and actuator go to complete the collection and processing of data, can not only utilize optimizer for the suitable index of its selection, can also
Using the existing optimization of actuator itself and parallel processing, greatly reduce waste and the run time of system resource, enhancing
Can, while reducing implementation and maintenance difficulties.
Embodiment two
Fig. 2 is the flow chart of the acquisition methods of statistics of database information provided by Embodiment 2 of the present invention, and this method can be with
It is executed, is specifically comprised the following steps by computer equipment：
The statistical information collection instruction of user is converted into corresponding SQL statement by step 201.
For example, STAT 100ON T (C) are converted into
STAT 100 ON SELECT C,COUNT(*),
SYSFUN_1(C),SYSFUN_2(C)..,SYSFUN_N(C)FROM T GROUP BY C ORDER BY C。
Step 202 carries out semantic analysis to SQL statement.
If semantic analysis correctly goes to step 203, otherwise report an error.
Step 203 extracts SELECT statement from SQL statement, is used in combination STAT that SELECT statement is marked.
SELECT statement in previous example is：SELECT C,COUNT(*),SYSFUN_1(C),SYSFUN_2(C)..,
SYSFUN_N(C)FROM T GROUP BY C ORDER BY C。
Step 204 carries out semantic analysis to SELECT statement.
Step 205 generates optimal execution plan for SELECT statement.
After comprehensive descision, an optimal executive plan can be generated according to index and the factors such as parallel parameter herein.
Step 206 executes optimal execution plan, generates data acquisition system.
Step 207 counts data acquisition system to obtain statistical information, and Database System Tables are written in statistical information.
Embodiment three
Fig. 3 is the structural schematic diagram of the acquisition device for the statistics of database information that the embodiment of the present invention three provides, with reference to figure
3, which includes：User instruction conversion module 11, SQL processing modules 12 and data collection processing module 13, wherein user refers to
Conversion module 11 is enabled, corresponding SQL statement is converted into for the statistical information of user to be collected instruction；SQL processing modules 12 are used
In carrying out semantic analysis to the SQL statement, the SELECT statement that can be executed by database is extracted；It is held by the database
The row SELECT statement obtains meeting the data acquisition system that the statistical information collects instruction；Data collection process module 13 is used
In counting to obtain statistical information to the data acquisition system, the statistical information includes number of data lines, data mean breadth, different value
Number and different value distribution.
Based on the above technical solution, the SQL processing modules 12 are additionally operable to keyword STAT to described
SELECT statement is marked.
Based on the above technical solution, the data collection process module 13 is additionally operable to write the statistical information
Enter Database System Tables.
Based on the above technical solution, the user instruction conversion module 11 is specifically used for from the statistical information
Extraction objects of statistics and sample rate in instruction are collected, is collected the statistical information according to the objects of statistics and the sample rate
Instruction is converted into the SQL statement.
The acquisition device for the statistics of database information that the embodiment of the present invention is provided can perform any embodiment institute of the present invention
The acquisition methods of the statistics of database information of offer have the corresponding function module of execution method and advantageous effect.
Example IV
Fig. 4 is a kind of structural schematic diagram for computer equipment that the embodiment of the present invention four provides, as shown in figure 4, the calculating
Machine equipment includes processor 20, memory 21, input unit 22 and output device 23；The quantity of processor 20 in computer equipment
Can be one or more, in Fig. 4 by taking a processor 20 as an example；Processor 20, memory 21, input in computer equipment
Device 22 can be connected with output device 23 by bus or other modes, in Fig. 4 for being connected by bus.
Memory 21 is used as a kind of computer readable storage medium, can be used for storing software program, computer can perform journey
Sequence and module, such as the corresponding program instruction/module of the acquisition methods of the statistics of database information in the embodiment of the present invention.Processing
Device 20 is stored in software program, instruction and module in memory 21 by operation, to execute the various of computer equipment
The acquisition methods of above-mentioned statistics of database information are realized in application of function and data processing.
Memory 21 can include mainly storing program area and storage data field, wherein storing program area can store operation system
Application program needed for system, at least one function；Storage data field can be stored uses created data etc. according to terminal.This
Outside, memory 21 may include high-speed random access memory, can also include nonvolatile memory, for example, at least a magnetic
Disk storage device, flush memory device or other non-volatile solid state memory parts.In some instances, memory 21 can be further
Include the memory remotely located relative to processor 20, these remote memories can be set by network connection to computer
It is standby.The example of above-mentioned network includes but not limited to internet, intranet, LAN, mobile radio communication and combinations thereof.
Input unit 22 can be used for receiving the number or character information of input, and generates and set with the user of computer equipment
It sets and the related key signals of function control inputs.Output device 23 may include that display screen etc. shows equipment.
Embodiment five
The embodiment of the present invention five also provides a kind of storage medium including computer executable instructions, and the computer can be held
Row instruction by computer processor when being executed for executing statistics of database information that any embodiment of the present invention is provided
Relevant operation in acquisition methods.
By the description above with respect to embodiment, it is apparent to those skilled in the art that, the present invention
Embodiment can be realized by software and required common hardware, naturally it is also possible to by hardware realization, but in many cases before
Person is more preferably embodiment.Based on this understanding, the technical solution of the embodiment of the present invention is substantially in other words to existing skill
The part that art contributes can be expressed in the form of software products, which can be stored in computer
In readable storage medium storing program for executing, such as the floppy disk of computer, read-only memory (Read-Only Memory, ROM), random access memory
(Random Access Memory, RAM), flash memory (FLASH), hard disk or CD etc., including some instructions are used so that one
Computer equipment (can be personal computer, server or the network equipment etc.) executes each embodiment of the embodiment of the present invention
The method.
It is worth noting that, in the embodiment of above-mentioned apparatus, included each unit and module are only patrolled according to function
It volume is divided, but is not limited to above-mentioned division, as long as corresponding function can be realized；In addition, each function list
The specific name of member is also only to facilitate mutually differentiation, is not intended to restrict the invention the protection domain of embodiment.
Note that above are only preferred embodiment and the institute's application technology principle of the embodiment of the present invention.Those skilled in the art
It will be appreciated that the embodiment of the present invention is not limited to specific embodiment described here, can carry out for a person skilled in the art each
The protection domain that kind significantly changes, readjusts and substitutes without departing from the embodiment of the present invention.Therefore, although more than passing through
Embodiment is described in further detail the embodiment of the present invention, but the embodiment of the present invention is not limited only to the above implementation
Example can also include other more equivalent embodiments in the case where not departing from design of the embodiment of the present invention, and the present invention is implemented
The range of example is determined by scope of the appended claims.
Claims (10)
1. a kind of acquisition methods of statistics of database information, which is characterized in that including：
The statistical information of user is collected into instruction and is converted into corresponding SQL statement；
Semantic analysis is carried out to the SQL statement, extracts the SELECT statement that can be executed by database；
The SELECT statement, which is executed, by the database obtains the data acquisition system for meeting the statistical information collection instruction；
The data acquisition system is counted to obtain statistical information, the statistical information includes number of data lines, data mean breadth, difference
The number of value and the distribution of different value.
2. according to the method described in claim 1, it is characterized in that, in the SELECT languages that extracts and can be executed by database
After sentence, further include：
The SELECT statement is marked with keyword STAT.
3. method according to claim 1 or 2, which is characterized in that counted to the data acquisition system described
After information, further include：
Database System Tables are written into the statistical information.
4. according to the method described in claim 1, it is characterized in that, the statistical information by user, which collects instruction, is converted into phase
The SQL statement answered, including：
Extraction objects of statistics and sample rate in instruction are collected from the statistical information, according to the objects of statistics and the sample rate
The statistical information is collected into instruction and is converted into the SQL statement.
5. a kind of acquisition device of statistics of database information, which is characterized in that including：
User instruction conversion module is converted into corresponding SQL statement for the statistical information of user to be collected instruction；
SQL processing modules extract the SELECT languages that can be executed by database for carrying out semantic analysis to the SQL statement
Sentence；The SELECT statement, which is executed, by the database obtains the data acquisition system for meeting the statistical information collection instruction；
Data collection process module obtains statistical information for being counted to the data acquisition system, and the statistical information includes data
The distribution of line number, data mean breadth, the number of different value and different value.
6. device according to claim 5, which is characterized in that the SQL processing modules are additionally operable to use STAT pairs of keyword
The SELECT statement is marked.
7. device according to claim 5 or 6, which is characterized in that the data collection process module, being additionally operable to will be described
Database System Tables are written in statistical information.
8. device according to claim 5, which is characterized in that the user instruction conversion module is specifically used for from described
Statistical information collects extraction objects of statistics and sample rate in instruction, according to the objects of statistics and the sample rate by the statistics
Information collects instruction and is converted into the SQL statement.
9. a kind of computer equipment, including memory, processor and storage are on a memory and the meter that can run on a processor
Calculation machine program, which is characterized in that the processor realizes the data as described in any in claim 1-4 when executing described program
The acquisition methods of library statistical information.
10. a kind of storage medium including computer executable instructions, which is characterized in that the computer executable instructions by
Acquisition methods when computer processor executes for executing the statistics of database information as described in any in claim 1-4.
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| CN111274270A (en) * | 2020-02-24 | 2020-06-12 | 北京东方金信科技有限公司 | Statistical information processing and using method of database optimizer and storage device |
| CN111401009A (en) * | 2020-03-17 | 2020-07-10 | 深圳市随金科技有限公司 | Digital expression symbol recognition conversion method, device, server and storage medium |
| CN112925856A (en) * | 2019-12-06 | 2021-06-08 | 中国移动通信集团重庆有限公司 | Entity relation analysis method, entity relation analysis device, entity relation analysis equipment and computer storage medium |
| CN114238395A (en) * | 2022-01-06 | 2022-03-25 | 税友软件集团股份有限公司 | Database optimization method and device, electronic equipment and storage medium |
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