CN111061724B - High-speed real-time database management method and device for power distribution automation system - Google Patents
High-speed real-time database management method and device for power distribution automation system Download PDFInfo
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Abstract
The invention relates to a high-speed real-time database management method and device for a power distribution automation system. The method comprises the following steps: A. in the main and standby databases, uniformly packaging data access interfaces through functions; B. pre-storing a remote signaling attribute content table, a remote signaling state table, a hash direct addressing table of a terminal and a remainder dividing addressing table according to remote signals in a real-time database, and configuring a linked list data structure for each terminal; C. if the remote signaling number of the accessed terminal exceeds the threshold value, the data index is carried out by combining the remainder removing addressing table with the linked list data structure, otherwise, the data index is carried out by directly using the hash direct addressing table. The apparatus comprises a memory and a processor which implements the method described above when executing a computer program stored in the memory. The invention can reduce the cost of the memory on the premise of ensuring the data retrieval performance.
Description
Technical Field
The invention relates to a high-speed real-time database management method and device for a power distribution automation system.
Background
For the distribution automation system, since the number of the accessed terminals is particularly large, according to the current statistical experience of field operation, the number of the accessed FTUs of a city system can reach tens of thousands, and the number of the accessed DTUs also reaches thousands, and in the future, the number of the accessed terminals is only increased. The DAS system receives three remote information sent by so many terminals at the same time, so that the access speed of the three remote databases is important in order to ensure that the performance index can meet the requirements of national network standards.
Existing triple-tele-information libraries are accessed using a hash direct addressing method, which is not better than this method in terms of performance. While databases designed using the hash direct addressing method have absolute advantages in performance, this speed advantage is traded for memory overhead, and as distribution automation progresses, more terminals are accessed by the system and more information is sent to the system on the distribution terminals.
Suppose a local market system is to access 50000 FTUs, and the maximum number of remote signaling signals which can be accessed by the FTUs reaches 300. 8000 DTUs are connected, the maximum number of remote signaling signals which can be connected by the DTU is 3000, each remote signaling needs a memory of 100 bytes to store information, and then the memory size needed by a remote signaling database is as follows: 3900000000 byte=3719m, where light is a telemetry database, requiring approximately 3.7G of memory, as well as telemetry database. It can be seen that database memory consumption designed using the hash direct addressing method is actually too great.
There is also a problem that the conditions described above define a maximum telemetry signal, a maximum telemetry number. There is no requirement in the specification that the remote signaling of an access terminal must be less than 300, and for terminals with individual remote signaling greater than 300, either the system does not access the remote signaling information above the remote signaling of the terminal 300 or the system expands to accommodate the terminal.
Disclosure of Invention
In order to solve the technical problems and reduce the memory overhead on the premise of ensuring the performance, the invention provides a high-speed real-time database management method and device suitable for a power distribution automation system.
The technical scheme of the invention relates to a high-speed real-time database management method for a power distribution automation system, which comprises the following steps:
A. in the main and standby databases, uniformly packaging data access interfaces through functions;
B. pre-storing a remote signaling attribute content table, a remote signaling state table, a hash direct addressing table of a terminal and a remainder dividing addressing table according to remote signals in a real-time database, and configuring a linked list data structure for each terminal;
C. if the remote signaling number of the accessed terminal exceeds the threshold value, the data index is carried out by combining the remainder removing addressing table with the linked list data structure, otherwise, the data index is carried out by directly using the hash direct addressing table.
In some aspects, the step a comprises: establishing a database in a mode of file mapping and sharing memory;
when receiving the data updating request, the data synchronization service process sends the content of the request updating to the standby database, and the standby database updates to the main database after receiving the information.
In some aspects, the step a further comprises: for the main and standby databases in the same local area network, synchronizing the main and standby databases of all data during the establishment of TCP/IP connection; when the connection is normal, the update data on the main database is synchronized to the standby machine at the same time, so that the standby database executes the update. For the master and slave databases in different networks, when the version numbers received by the slave databases are discontinuous, the master database is informed to carry out full data synchronization through a handshake mechanism.
In some aspects, in said step B: the hash direct addressing table contains remote signals and corresponding data storage index information; the remainder dividing addressing table comprises a remote signal corresponding to the remainder dividing, a data index position obtained according to the remainder dividing value of the remote signal, and a linked list position index when data conflict.
In some aspects, the step B comprises: when the attribute data is changed, the whole database is written and locked, so that conflicts caused by writing the same data by different processes are avoided; when real-time data is changed, if the data entry is a hash direct addressing table and a remainder-by-remainder addressing table, then the two tables are read-locked when the real-time data is written.
In some aspects, in step C: for FTU terminals, the threshold is preferably 70; for DTU terminals, the threshold is 2000. The divisor value is preferably 30 when the divide remainder addressing table is configured.
The invention also relates to a computer device comprising a memory and a processor, which executes a computer program stored in the memory to carry out the method.
The technical solution of the present invention also relates to a computer-readable storage medium, on which a computer program is stored, which computer program, when being executed by a processor, implements the above-mentioned method.
The beneficial effects of the invention are as follows:
1) On the basis of fully utilizing the advantages of the hash direct addressing method in performance, the remainder removing method and the linked list method are utilized to reduce the overhead of the memory;
2) A database is established by using a mode of file mapping and memory sharing, and data sustainability is provided;
3) Providing safe database read-write capability by using a file read-write lock;
4) The method ensures the consistency of data on different machines by using a mode of full data synchronization, update synchronization and version control.
Drawings
Fig. 1 shows a general flow chart of the method according to the invention.
Fig. 2 is a schematic diagram illustrating database synchronization in an arrangement according to the present invention.
Detailed Description
The conception, specific structure, and technical effects produced by the present invention will be clearly and completely described below with reference to the embodiments and the drawings to fully understand the objects, aspects, and effects of the present invention.
Referring to fig. 1, the method according to the present invention may comprise the steps of:
A. in the main and standby databases, uniformly packaging data access interfaces through functions;
B. pre-storing a remote signaling attribute content table, a remote signaling state table, a hash direct addressing table of a terminal and a remainder dividing addressing table according to remote signals in a real-time database, and configuring a linked list data structure for each terminal;
C. if the remote signaling number of the accessed terminal exceeds the threshold value, the data index is carried out by combining the remainder removing addressing table with the linked list data structure, otherwise, the data index is carried out by directly using the hash direct addressing table.
For step a, it may further include: establishing a database in a mode of file mapping and sharing memory; when receiving the data updating request, the data synchronization service process sends the content of the request updating to the standby database, and the standby database updates to the main database after receiving the information. For the main and standby databases in the same local area network, synchronizing the main and standby databases of all data during the establishment of TCP/IP connection; when the connection is normal, the update data on the main database is synchronized to the standby machine at the same time, so that the standby database executes the update. For the master and slave databases in different networks, when the version numbers received by the slave databases are discontinuous, the master database is informed to carry out full data synchronization through a handshake mechanism.
For step B: the hash direct addressing table contains remote signals and corresponding data storage index information; the remainder dividing addressing table comprises a remote signal corresponding to the remainder dividing, a data index position obtained according to the remainder dividing value of the remote signal, and a linked list position index when data conflict. When the attribute data is changed, the whole database is written and locked, so that conflicts caused by writing the same data by different processes are avoided; when real-time data is changed, if the data entry is a hash direct addressing table and a remainder-by-remainder addressing table, then the two tables are read-locked when the real-time data is written.
Details of the above method steps are described below by way of specific examples.
In one embodiment, the upper 8 bits of int are used as a tag to distinguish device types, while the lower 24 bits are used as primary hash index for direct addressing access to the database, and the telemetry, and remote control numbers are used as secondary hash index for database access, in the definition of device ID.
The following description will take a remote signaling library of FTU as an example:
from the above structure, when the remote signaling database is accessed, the detailed information of the remote signaling can be directly obtained according to the hash index and the remote signal of the equipment of the FTU.
The embodiments described below are based on the above described device ID structure as an example (int high 8 bits represent different device types, low 24 bits are hash values of the devices, defining the device IDs in this way, with maximum support access to 16777216 devices for a given type, this order of magnitude being sufficient for all sites at present and for a long period of time in the future).
Data structure design
Based on fully utilizing the advantages of the hash direct addressing method in performance, the remainder removal method and the linked list method are utilized to reduce the overhead of the memory, and the following is only taken as an example for remote signaling:
1) Remote signaling attribute table of contents (stored in array form, data size can be specified by configuration file)
Assuming that each remote signaling attribute needs to occupy 100 bytes of memory space, the space size of 100 thousands of remote signaling measurement points is 95M.
2) Remote signaling state table
Assuming that each remote signaling state needs to occupy 16byte of memory space, 100 ten thousand measuring points need to occupy 15M of space
3) Hash direct addressing table
Ftu_yx_max is the maximum remote signaling range for direct addressing access, and the value 70 can be adapted to most FTU terminals based on field experience. The hash direct addressing table occupies approximately 13M according to the maximum supporting 5 ten thousand FTU terminal access calculations.
Dtu_yx_max is 2000, maximum accessible DTU number is 5000, and DTU direct addressing table occupies about 38M.
4) Addressing table for remainder removal
Ftu_mod_num is the divisor in the remainder-dividing method, the larger the value of the divisor is, the smaller the possibility of data collision is, but the larger the occupied space is, and the value 30 (which can be modified by the configuration file) is comprehensively considered, and the size of the occupied space of the table is about 17M
The dtu_mod_num takes a value of 300 and the remainder of the division of the DTU address table occupies approximately 17M.
5) Linked list space structure used in addressing conflict except remainder
LINK_MAX takes 10 ten thousand values, and the space of the linked list occupies 1.5M
Data index structure instructions
The index table uses the design of direct addressing method, remainder removing method and chain table method, in general, the remote signaling of FTU is not greater than 70, but the remote signaling of DTU is not greater than 2000, the remote signaling within the limit can all use the direct addressing method to obtain the index, and for a few remote signaling exceeding the limit, the remainder removing method and chain table method are used to ensure that the system can access the remote signaling information with any size.
The following illustrates the applicability of the remainder-elimination method + linked list method.
Assuming that the FTU terminal with index 1 needs to access the 71 # remote signaling, the 101 # remote signaling and the 131 # remote signaling, the linked list structure can be illustrated by the following two tables.
When information of No. 131 remote signaling is to be accessed, (131-70)% 30=1, sftuyxmod (1). Smod (1). Ny x no-! =131, obtain Sftuyxmod (1). Smod (1). Nindex_next value 1, access Slink (1). Nyxno-! =131, obtaining a value 2 of Slink (1). Nindex_next, judging Slink (2). Nyxno= 131 &nrtuid = FTU1 ID, obtaining an index value nindex_inf=3, and obtaining detailed information of remote signaling and a remote signaling state according to the index value 3.
Security of database access
And the security of the reading and writing of the database is ensured by using a file reading and writing locking mechanism. According to the characteristics of the power distribution system, the attribute data of remote signaling, remote measurement and remote control are updated when the data is maintained, the updating frequency is not particularly high, the granularity of access locking aiming at the attribute can be relatively large, the updating frequency of the state library is very high, and locking with finer scales is needed.
When the attribute data is changed, the whole database is required to be written and locked, so that the conflict caused by writing the same data by different processes is avoided. (if the design at the application layer ensures that there is only one write process, then the lock scale of the write lock can be refined to units of terminal bits)
When real-time data is changed, the data entry is a hash direct addressing table and a remainder removing addressing table, so that the two tables can be read and locked when the real-time data is written, and the record is an array structure taking a terminal ID as a unit, and the locking can lock the whole index array of the related terminal ID, so that the access of the real-time data of other terminal equipment is not influenced.
Data synchronization
Referring to fig. 2, for the primary and secondary systems in the same lan, since the transmission is reliable, primary and secondary synchronization of full data can be performed once when a TCP/IP connection is established, and when the connection is normal, the primary machine updates data and synchronizes the update content to the secondary machine, so that the secondary machine performs a primary update.
For the network with the isolation system, the synchronization needs to have a handshake mechanism, when the handshake is interrupted and is recovered, the synchronization of all data is performed once, the version number needs to be increased for the common update synchronization, when the version number received by the standby system is discontinuous, the update data is lost, and at the moment, the host needs to be informed of all data synchronization through the handshake mechanism.
It should be appreciated that the method steps in embodiments of the present invention may be implemented or carried out by computer hardware, a combination of hardware and software, or by computer instructions stored in non-transitory computer-readable memory. The method may use standard programming techniques. Each program may be implemented in a high level procedural or object oriented programming language to communicate with a computer system. However, the program(s) can be implemented in assembly or machine language, if desired. In any case, the language may be a compiled or interpreted language. Furthermore, the program can be run on a programmed application specific integrated circuit for this purpose.
Furthermore, the operations of the processes described herein may be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The processes (or variations and/or combinations thereof) described herein may be performed under control of one or more computer systems configured with executable instructions, and may be implemented as code (e.g., executable instructions, one or more computer programs, or one or more applications), by hardware, or combinations thereof, collectively executing on one or more processors. The computer program includes a plurality of instructions executable by one or more processors.
Further, the method may be implemented in any type of computing platform operatively connected to a suitable computing platform, including, but not limited to, a personal computer, mini-computer, mainframe, workstation, network or distributed computing environment, separate or integrated computer platform, or in communication with a charged particle tool or other imaging device, and so forth. Aspects of the invention may be implemented in machine-readable code stored on a non-transitory storage medium or device, whether removable or integrated into a computing platform, such as a hard disk, optical read and/or write storage medium, RAM, ROM, etc., such that it is readable by a programmable computer, which when read by a computer, is operable to configure and operate the computer to perform the processes described herein. Further, the machine readable code, or portions thereof, may be transmitted over a wired or wireless network. When such media includes instructions or programs that, in conjunction with a microprocessor or other data processor, implement the steps described above, the invention described herein includes these and other different types of non-transitory computer-readable storage media. The invention also includes the computer itself when programmed according to the methods and techniques of the present invention.
The computer program can be applied to the input data to perform the functions described herein, thereby converting the input data to generate output data that is stored to the non-volatile memory. The output information may also be applied to one or more output devices such as a display. In a preferred embodiment of the invention, the transformed data represents physical and tangible objects, including specific visual depictions of physical and tangible objects produced on a display.
The present invention is not limited to the above embodiments, but can be modified, equivalent, improved, etc. by the same means to achieve the technical effects of the present invention, which are included in the spirit and principle of the present invention. Various modifications and variations are possible in the technical solution and/or in the embodiments within the scope of the invention.
Claims (5)
1. A database management method for a power distribution automation system, the method comprising the steps of:
A. in the main and standby databases, uniformly packaging data access interfaces through functions; the step A comprises the following steps:
establishing a database in a mode of file mapping and sharing memory;
when receiving the data updating request, the data synchronization service process sends the content of the request updating to the standby database, and the standby database updates to the main database after receiving the information;
for the main and standby databases in the same local area network, synchronizing the main and standby databases of all data during the establishment of TCP/IP connection;
when the connection is normal, the update data on the main database is synchronized to the standby machine at the same time, so that the standby database executes the update;
for the main and standby databases in different networks, when the version numbers received by the standby databases are discontinuous, the main databases are informed to carry out full data synchronization through a handshake mechanism;
B. pre-storing a remote signaling attribute content table, a remote signaling state table, a hash direct addressing table of a terminal and a remainder dividing addressing table according to remote signals in a real-time database, and configuring a linked list data structure for each terminal; in the step B:
the hash direct addressing table contains remote signals and corresponding data storage index information;
the remainder removing addressing table comprises a remote signal corresponding to the remainder removing, a data index position obtained according to the remainder dividing value of the remote signal and a linked list position index when data conflict;
when the attribute data is changed, the whole database is written and locked, so that conflicts caused by writing the same data by different processes are avoided;
when real-time data is changed, if the data entry is a hash direct addressing table and a remainder removing addressing table, reading and locking the two tables when the real-time data is written;
C. if the remote signaling number of the accessed terminal exceeds the threshold value, the data index is carried out by combining the remainder removing addressing table with the linked list data structure, otherwise, the data index is carried out by directly using the hash direct addressing table.
2. The method according to claim 1, characterized in that in said step C:
for FTU terminals, the threshold is 70; for DTU terminals, the threshold is 2000.
3. The method according to claim 1, characterized in that in said step C:
the divisor value is 30 when the divide remainder addressing table is configured.
4. A computer device comprising a memory and a processor, wherein the processor implements the method of any of claims 1 to 3 when executing a computer program stored in the memory.
5. A computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the method of any of claims 1 to 3.
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