CN100356376C - Energy saving store method for embedded type mobile database - Google Patents
Energy saving store method for embedded type mobile database Download PDFInfo
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- CN100356376C CN100356376C CNB2005100613923A CN200510061392A CN100356376C CN 100356376 C CN100356376 C CN 100356376C CN B2005100613923 A CNB2005100613923 A CN B2005100613923A CN 200510061392 A CN200510061392 A CN 200510061392A CN 100356376 C CN100356376 C CN 100356376C
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
Abstract
The present invention discloses an energy-saving store method for embedded mobile databases. The method of the present invention uses the storage characteristics of embedded mobile databases, a data storage layer is rebuilt at a mobile terminal, and the access to host servers, which is supported by various devices including networks, is added; an access decision layer is built between a data access layer and the data storage layer to decide devices needed accessing by each data requirement. Based on the architecture, a user uses parameters of an appointed access strategy, and a system adopts a method of writing to all devices and reading to optimal devices in order to obtain the optimal database performance and power consumption.
Description
Technical field
The present invention relates to a kind of energy saving store method of embedded mobile data base.
Background technology
The embedded mobile data base technology is the emerging technology that becomes increasingly active in recent years and receive much concern, it is except the major function with relational database, also at the characteristics of embedded system and mobile computing, the tool characteristic in addition at aspects such as the architecture of database, function setting, application and developments.The appearance of embedded mobile data base technology, make that people can be by the portable client terminal (as: PDA in the hand, palm PC, mobile phone etc.) with wireless mode visit central database system, thus can not obtain own needed data with freely not being subjected to environmental constraints.Between the operating system and application program of embedded mobile data base in embedded device, for the application that needs database function provides support and drives.
Because the compactness of embedded system resource on time and space, embedded database has the characteristics of himself, mainly shows following several respects:
1. occupying system resources is few.Be exactly to take few ROM that tries one's best, ram space and cpu resource specifically, we can say that this is the most outstanding characteristics of embedded database, this is determined by the embedded system resource-constrained.
2. manageability, robustness and security.In embedded device, the management of database is transparent to the user, and this just requires embedded database can finish functions such as starting initialization, log management, data compression, backup, data recovery automatically; And embedded device often has unpredictable hard reset, and this just needs database that the robustness of height is arranged.
3. transplantability.The platform of embedded system is of a great variety, so embedded database should have certain portability, to be applicable to different hardware and software platforms.
The computing environment of move database is the expansion of traditional distributed Database Systems, and it can regard the distributed system that client and fixed server node dynamically are connected as.Therefore the data base management system (DBMS) in the mobile computing environment is a kind of dynamic distributed data base management system (DBMS).Its mode configuration is divided into the two large divisions on the whole: the one, and centralized data base system model structure has been represented the basic structure of each local field local database systems on the ground; The one, the pattern rank of distributed data base system, comprising: overall external schema, global concept schema, fragmentation schema, distribution pattern.
Embedded mobile data base combine embedded and mobile both, be with the difference of general database: embedded mobile data base logically is not independently, it must be got in touch with fixing central database server wirelessly, download needed data from central database, and the modification that this locality is done is uploaded to central database, so depend on central database server in essence, data wherein are a subclass of central database.The embedded mobile data base system has embedded and mobile both advantage concurrently, overcomes both weakness simultaneously in application again.The movability of mobile device and disconnecting inevitable requirement system have higher autonomy, but the limitation of movability, data storage and processing power requires database and central database on the mobile device that close getting in touch arranged again.
Summary of the invention
The object of the present invention is to provide a kind of energy saving store method of embedded mobile data base.
The technical scheme that the present invention solves its technical matters employing is as follows:
1) adds the access decision layer in the embedded mobile data base on terminal;
Embedded mobile data base system on the terminal can be divided into following level:
Sql like language translation layer/interface layer, data access layer, data storage layer; Add the access decision layer between data access layer and data storage layer, its major function is: preserved the log-on message of each equipment and the write queue corresponding, accepted the visit to the data fragment on upper strata with each equipment, and the decision-making of the equipment that conducts interviews; This layer is one deck that whole embedded mobile data base reaches energy-conservation most critical;
2) register a plurality of memory devices, and log-on message is kept at the access decision layer;
Embedded mobile data base is supported multiple memory device, by registering the memory device that increases support; The registration of an equipment need provide the power consumption w of equipment, the delay 1 that reads and writes data, specify this equipment can be provided for the space size S of database storing simultaneously under various states; The log-on message of each equipment is stored in the access decision layer, the decision-making foundation during as data access; I.e. write queue of plant maintenance for this reason in internal memory of Database Systems behind each facility registration;
3) distribution pattern of modification global catalog;
Distributed data base system has been safeguarded a global catalog in internal memory, deposited the definition of global concept schema, fragmentation schema, distribution pattern, and the definition of map between each pattern, deposit the definition of relevant user access authority and the definition of data integrity constraint condition;
The fragment that obtains according to fragmentation schema, be distributed in physically on various memory devices and the central database, amended distribution pattern defines each fragment deposit position physically according to selected data policy, promptly a fragment and a plurality of equipment is set up a kind of map of one-to-many;
4) read-write of data storage layer;
A) read data:
The first step, the application program read request on upper strata; User distribution formula query requests is by sql like language translation layer/interface layer, and data access layer implements on the suitable data fragment user's query requests, and given the access decision layer with these data slots;
In second step, select memory device; By the distribution pattern in the data dictionary, the equipment that will have the request msg fragment adds candidate device; The information that the access decision layer provides according to device registration and the access strategy parameter of user's appointment select best equipment to conduct interviews in candidate device;
Determine the privilege of access degree of a memory device need consider two factors: the power consumption of equipment, the access delay of equipment; The formula that is used for the preferred value of computing equipment visit is:
T＝(w/W)*k+(l/L)*(l-k)
Wherein:
T is the relative importance value of device access, and it is high more to be worth more little relative importance value,
W is the power of device registration,
The access delay of l equipment,
The average power consumption of all device registrations of W,
The average retardation of all device registrations of L,
K is a user-specified parameters, is used to weigh the degree of paying the utmost attention to of data access power consumption and response speed, and it is worth between 0 to 1;
The 3rd step is from the data storage layer reading of data; When selection equipment is carried out read operation, check the write operation that whether has in the write queue at this piece earlier, if exist, write queue is all write this equipment, carry out read operation again;
If the data slot of request only is present in the central database, then by the network service layer, reading corresponding data fragment from central database, and the corresponding data fragment is added the write queue of each equipment;
Postpone excessive equipment for some, for improving response speed, taked another strategy when reading of data: the access decision layer switches to system the mode by the access to netwoks central database earlier, in its time delay, carry out reading of data slot, when arriving facility registration after specified time delay, again access object is pointed to local device;
For the data slot that is distributed in distinct device simultaneously, under the condition that the user allows, carry out parallel work-flow, further improve data reading speed;
B) write data:
The first step, the application program write request on upper strata; The user's data update request is by sql like language translation layer/interface layer, and data access layer is converted into the renewal operation to the distributed data base fragment, and these is upgraded operation given the access decision layer;
In second step, will operate the adding write queue; The access decision layer is received write operation, promptly revises, deletes, increases, and these operations are added the write queue of each equipment, and revises distribution pattern in the data dictionary;
In the 3rd step, the visit data accumulation layer writes corresponding device or central database with the operation in the formation; When several situation below the appearance, process is write in startup the operation in the write queue is write storage medium or by communication management layer, writes central database, after operation is finished, will empty or delete formation:
(1) formation reaches the length of setting, empties formation after writing;
(2) reach time that writes back of setting, empty formation after writing;
(3) piece of current read operation correspondence is present in the write queue, empties formation after writing;
When (4) a certain equipment being nullified, write back deletion formation from database;
Write queue writes the operation of storage medium and adopts FIFO to carry out in proper order, to keep the consistance of data.
The present invention compares with traditional embedded mobile data base, and the useful effect that has is:
The present invention is a kind of embedded database that is applied in the mobile environment, make it can support plurality of devices in modification data of database accumulation layer, and by " reading from an optimal device; the strategy of writing to all devices ", for energy-saving data access afterwards provides condition, the efficient of visit and the integrality of data have been taken into account simultaneously again.
(1) low in energy consumption, the efficient height.Though write operation adopts the method for writing to a plurality of equipment, this on power consumption than the common operation height of writing separately to an equipment, but for certain operations in the future provides energy-conservation condition, for one mainly be the terminal device of read access request, this practice is more much lower than commonsense method energy consumption generally.Simultaneously this write operation asynchronous, that concentrate has reduced equipment at spent time and the energy of each operating mode conversion, has improved the response speed of write operation.Aspect read operation,, will preferentially use the equipment of power consumption and efficient the best by the access decision layer.Visit some in addition when postponing large equipment, visit the sky that central database remedies user's time delay by network and wait for.
(2) configurability.The user can specify the k value as required, comes the consideration degree of governing response speed and power consumption.The T value is more little in general, and the relative importance value of device access is high more, and promptly priority access is low in energy consumption, responds fast equipment, in guaranteed efficiency, has reached purpose of energy saving.
Description of drawings
Accompanying drawing is the embedded mobile data base system assumption diagram of applicating energy-saving storage means;
Embodiment
As shown in drawings, the data access flow process of having used the embedded mobile data base of energy saving store method is specially:
At first user or application program are carried out grammatical analysis by sql like language translation layer/interface layer to SQL statement, and mandate, integrity checking and query optimization or calling interface function generate the instruction to the logical data operation.
The set operation on upper strata utilizes amended global catalog by data access layer, and operation is converted to the base unit that distributed data base is visited, the i.e. operation of data logic fragment.And, navigate to each memory device or central database physically with these data slots.
The access decision layer will be according to the physical allocation situation of upper layer data fragment, the decision-making of the equipment that conducts interviews.This layer is one deck that whole embedded mobile data base reaches energy-conservation most critical.
Final visit local datastore layer or central database, to being positioned at data slot and the system buffer on multiple memory device and the master server, the logic of execute file is opened, closes, is read page or leaf, writes page or leaf, the buffer zone read and write, announce operation such as superseded.
The energy saving store method of embedded mobile data base mainly is by reading and writing realizing of two aspects, and when setting up database, needs the memory device of each support of registration also to revise global catalog:
1. the registration of memory device
The local database system of terminal is supported one or more memory devices.When local data base is set up, need a memory device at least, can increase the memory device of support afterwards by the registration new equipment.The registration of an equipment need provide the power consumption w of equipment, and the delay 1 that reads and writes data under various states specifies this equipment can be provided for the space size S of database storing simultaneously.Behind the facility registration, its log-on message will be stored in the access decision layer, the decision-making foundation during as data access; I.e. write queue of plant maintenance for this reason in internal memory of Database Systems behind each facility registration;
The block size that the branch of data is equipped with operating system is a unit, when the data on the memory device will reach a certain size (designated space size 90%), local database system will start a process, adopt clock algorithm (or other replacement policy) that the space is heavily distributed.
As, device registration SD card, CF card and micro harddisk (MD), log-on message is as follows:
SD card: 1=A millisecond, w=H watt, S=100M
CF card: 1=B millisecond, w=I watt, S=100M
MD (micro harddisk): (operating condition) 1=C millisecond, (during dormant state) 1=D ms, w=J watt, S=500M
Then: L=(A+B+C+D)/4 millisecond, W=(H+I+J)/3 watt
Behind the facility registration, be 01, the CF card is numbered physical equipment 02, micro harddisk is numbered physical equipment 03 SD card numbering physical equipment;
2. revise the distribution pattern of global catalog
Distributed data base system has been safeguarded a global catalog, mainly deposited global concept schema, fragmentation schema, the definition of distribution pattern, and the definition of map between each pattern, deposit the definition of relevant user access authority and the definition of data integrity constraint condition.
Data slot is the logical gate of holotopy, and in traditional distributed data base, a fragment can be assigned on the different node of network physically, and distribution pattern has defined the node that fragment is deposited.Because in the design, fragment is distributed on various memory devices and the central database physically, therefore distribution pattern is revised as according to selected data policy, define the physical equipment (comprising database server) that each fragment is deposited, promptly a fragment and a plurality of equipment are set up a kind of map of one-to-many.This is a kind of redundant distribution.
3. the read-write of data storage layer
A) read data:
The first step, the application program read request on upper strata.User distribution formula query requests is by sql like language translation layer/interface layer, and data access layer implements on the suitable data fragment user's query requests, and has given the access decision layer with these data slots;
In second step, select memory device.
If the user carries out: SELECT*FROM tablel WHERE attr=1;
Then by local database system query decomposition and database localization, return data distributes and the candidate device tabulation, as table 1;
Table 1
| The data slot numbering | The physical location numbering | Whether be positioned at write queue |
| 1 | 02，03 | Not |
| 2 | 01 | Be |
| 3 | 03 (dormant state) | Not |
| 4 | - | Not |
| 5 | - | Not |
| 6 | 03 (dormant state) | Not |
According to formula T=(w/W) * k+ (l/L) * (l-k)
After the user specifies the k value, can calculate each device access relative importance value T
The SD card, T
The CF cardAnd T
Micro harddisk (md)
The 3rd step is from the data storage layer reading of data.
For data slot 1, be positioned at simultaneously on CF card and the micro harddisk, if T
The CF card＜T
Micro harddisk (md), will preferentially select the CF card, if disposing, the user allows parallel read operation, will carry out read operation from two equipment simultaneously;
For data slot 2, can only select the SD card, but when carrying out read operation,, the operation of write queue need be write the SD card because this fragment is positioned at write queue, carry out read operation afterwards again, to guarantee the consistance of data;
For data slot 3 and 6, can only select the micro harddisk card, but because micro harddisk is when dormant state, response time is slow excessively, under the condition that wireless network connects, Database Systems will be obtained a part of data from central database in time delay, after micro harddisk begins reading of data, switch to the visit micro harddisk, to improve response speed.
For data slot 4,5, be not positioned on any one local device, therefore can only transfer request of access to communication management layer, by the access to netwoks central database, after the local acquisition request msg, visit data is added the write queue of each equipment by it, and the data fragmentation pattern of renewal data dictionary, prepare for visiting once more in the future.
B) write data:
The first step, the application programs write request on upper strata.User or application's data update request are by sql like language translation layer/interface layer, and data access layer is converted into the renewal operation to the distributed data base fragment, and these is upgraded operation given the access decision layer.
One group of user data update request is converted into renewal operation as shown in table 2.
Table 2
| Action number | The operation fragment | Action type | Physical location |
| 1 | 1 | Revise | 01 |
| 2 | 2 | Deletion | 02，03 |
| 3 | 3 | Increase | - |
In second step, will operate the adding write queue.
For data slot 1, only need retouching operation is added the write queue of the correspondence of 01 equipment and central database;
For data slot 2, deletion action need be added the write queue of 02,03 equipment and central database correspondence;
For data slot 3, need the write queue that operation adds all devices and central database correspondence will be increased.
Upgrade global catalog, keeping the consistance of renewal, and the fragment that do not write of mark.
In the 3rd step, the visit data accumulation layer writes corresponding device or central database with the operation in the formation.When several situation below the appearance, process is write in startup, the operation in the write queue is write storage medium or by communication management layer, writes central database, after operation is finished, will empty or delete formation:
(1) formation reaches the length of setting, empties formation after writing, and can determine according to the condition of database scale and embedded device;
(2) reach time that writes back of setting, empty formation after writing.Specify difference to write back the time according to the embedded device characteristic, general power consumption is bigger, and the response time is long, and the time that writes back is provided with bigger;
(3) piece of current read operation correspondence is present in the write queue, empties formation after writing;
When (4) a certain equipment being nullified, write back deletion formation from database;
Write queue writes the operation of storage medium and adopts FIFO to carry out in proper order, to keep the consistance of data.
Claims (1)
1. the energy saving store method of an embedded mobile data base is characterized in that:
1) adds the access decision layer in the embedded mobile data base on terminal;
Embedded mobile data base system on the terminal can be divided into following level:
Sql like language translation layer/interface layer, data access layer, data storage layer; Add the access decision layer between data access layer and data storage layer, its major function is: preserved the log-on message of each equipment and the write queue corresponding, accepted the visit to the data fragment on upper strata with each equipment, and the decision-making of the equipment that conducts interviews; This layer is one deck that whole embedded mobile data base reaches energy-conservation most critical;
2) register a plurality of memory devices, and log-on message is kept at the access decision layer;
Embedded mobile data base is supported multiple memory device, by registering the memory device that increases support; The registration of an equipment need provide the power consumption w of equipment, the delay l that reads and writes data, specify this equipment can be provided for the space size S of database storing simultaneously under various states; The log-on message of each equipment is stored in the access decision layer, the decision-making foundation during as data access; I.e. write queue of plant maintenance for this reason in internal memory of Database Systems behind each facility registration;
3) distribution pattern of modification global catalog;
Distributed data base system has been safeguarded a global catalog in internal memory, deposited the definition of global concept schema, fragmentation schema, distribution pattern, and the definition of map between each pattern, deposit the definition of relevant user access authority and the definition of data integrity constraint condition;
The fragment that obtains according to fragmentation schema, be distributed in physically on various memory devices and the central database, amended distribution pattern defines each fragment deposit position physically according to selected data policy, promptly a fragment and a plurality of equipment is set up a kind of map of one-to-many;
4) read-write of data storage layer;
A) read data:
The first step, the application program read request on upper strata; User distribution formula query requests is by sql like language translation layer/interface layer, and data access layer implements on the suitable data fragment user's query requests, and given the access decision layer with these data slots;
In second step, select memory device; By the distribution pattern in the data dictionary, the equipment that will have the request msg fragment adds candidate device; The information that the access decision layer provides according to device registration and the access strategy parameter of user's appointment select best equipment to conduct interviews in candidate device;
Determine the privilege of access degree of a memory device need consider two factors: the power consumption of equipment, the access delay of equipment; The formula that is used for the preferred value of computing equipment visit is:
T＝(w/W)*k+(l/L)*(1-k)
Wherein:
T is the relative importance value of device access, and it is high more to be worth more little relative importance value,
W is the power of device registration,
The access delay of l equipment,
The average power consumption of all device registrations of W,
The average retardation of all device registrations of L,
K is a user-specified parameters, is used to weigh the degree of paying the utmost attention to of data access power consumption and response speed, and it is worth between 0 to 1;
The 3rd step is from the data storage layer reading of data; When selection equipment is carried out read operation, check the write operation that whether has in the write queue at this piece earlier, if exist, write queue is all write this equipment, carry out read operation again;
If the data slot of request only is present in the central database, then by the network service layer, reading corresponding data fragment from central database, and the corresponding data fragment is added the write queue of each equipment;
Postpone excessive equipment for some, for improving response speed, taked another strategy when reading of data: the access decision layer switches to system the mode by the access to netwoks central database earlier, in its time delay, carry out reading of data slot, when arriving facility registration after specified time delay, again access object is pointed to local device;
For the data slot that is distributed in distinct device simultaneously, under the condition that the user allows, carry out parallel work-flow, further improve data reading speed;
B) write data:
The first step, the application program write request on upper strata; The user's data update request is by sql like language translation layer/interface layer, and data access layer is converted into the renewal operation to the distributed data base fragment, and these is upgraded operation given the access decision layer;
In second step, will operate the adding write queue; The access decision layer is received write operation, promptly revises, deletes, increases, and these operations are added the write queue of each equipment, and revises distribution pattern in the data dictionary;
In the 3rd step, the visit data accumulation layer writes corresponding device or central database with the operation in the formation; When several situation below the appearance, process is write in startup the operation in the write queue is write storage medium or by communication management layer, writes central database, after operation is finished, will empty or delete formation:
(1) formation reaches the length of setting, empties formation after writing;
(2) reach time that writes back of setting, empty formation after writing;
(3) piece of current read operation correspondence is present in the write queue, empties formation after writing;
When (4) a certain equipment being nullified, write back deletion formation from database;
Write queue writes the operation of storage medium and adopts FIFO to carry out in proper order, to keep the consistance of data.
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| CN101459694B (en) * | 2008-12-31 | 2012-12-05 | 中国科学院计算技术研究所 | Highly available message transmission frame and method oriented to distributed file system |
| CN104281506B (en) * | 2014-07-10 | 2017-02-15 | 中国科学院计算技术研究所 | Data maintenance method and system for file system |
| CN105631708B (en) * | 2015-12-25 | 2020-10-16 | 腾讯科技（深圳）有限公司 | Information processing method and device |
| CN107247760B (en) * | 2017-05-31 | 2021-02-23 | 应急管理部国家减灾中心(应急管理部卫星减灾应用中心) | Multi-level disaster reduction and relief information management method and system based on loose coupling mode |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20050004968A1 (en) * | 2003-07-02 | 2005-01-06 | Jari Mononen | System, apparatus, and method for a mobile information server |
| CN1585545A (en) * | 2004-06-08 | 2005-02-23 | 中兴通讯股份有限公司 | Embedded data base niformation inquiring method for mobile telecommunicating system |
| JP2005190354A (en) * | 2003-12-26 | 2005-07-14 | Matsushita Electric Ind Co Ltd | Mobile database device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20050004968A1 (en) * | 2003-07-02 | 2005-01-06 | Jari Mononen | System, apparatus, and method for a mobile information server |
| JP2005190354A (en) * | 2003-12-26 | 2005-07-14 | Matsushita Electric Ind Co Ltd | Mobile database device |
| CN1585545A (en) * | 2004-06-08 | 2005-02-23 | 中兴通讯股份有限公司 | Embedded data base niformation inquiring method for mobile telecommunicating system |
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