Method for constructing real-time database and data searching method
A data retrieval and construction method technology, applied in the field of reading and real-time database retrieval, can solve problems such as real-time performance can not meet the requirements, and achieve the effect of small data volume, small network bandwidth and fast access
Inactive Publication Date: 2011-09-14
HOHAI UNIV
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Problems solved by technology
The query method mostly uses search algorithms such as B+ tree. With more and more records managed by the real-time database, the average time to retrieve each object is getting longer and longer. That is, as the access volume increases, the real-time performance of the system It will also decline, the more access, the faster the decline, the real-time performance of the application will not meet the requirements
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Embodiment Construction
[0029] At first, the present invention provides a kind of construction method of real-time database, comprises the steps:
[0030] (1) Divide the real-time database into several data tables. The number and capacity of the tables are determined according to the needs, and a unique number starting from 0 is assigned to each data table, and at the same time, a two-dimensional search for each real-time database data table is established. array, with figure 1 Shown, including the number of each table and the corresponding memory start address;
[0031] (2) Each data table defines a number of fields, each field is a record, and each record is given a record number starting from 0; the storage content of each field can also be predefined, defined as real-time changing data or not Changed parameters;
[0032] (3) Establish a composite data structure of the record ID, including the serial number of the data table, the record number, and the number of uses. Among them, each time the s...
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The invention discloses a method for constructing a real-time database, which comprises the following steps of: 1, dividing the real-time database into a plurality of data sheets, determining quantity and capacity of the data sheets according to demands, endowing a unique number starting from 0 to each data sheet, and establishing a searching two-dimensional array related to the data sheets, wherein the searching two-dimensional array comprises numbers of the data sheets and memory starting addresses of the data sheets; 2, defining a plurality of fields for each data sheet, endowing each field with a recording number starting from 0; and 3, establishing composite structure data recording ID, wherein the composite structure data comprise numbers, recording numbers and use times of the data sheets, the storage position of each record is deleted once, and the use time is added with 1. The real-time database constructed by using the method can be used for searching request data without being influenced by the data volumes in the real-time database. The invention also discloses a data searching method of the real-time database.
Description
technical field [0001] The invention belongs to the technical field of electric power automation, in particular to a method for searching and reading a real-time database in an electric power automation system. Background technique [0002] Real-time database is a branch of database system development, which is suitable for dealing with continuously updated and rapidly changing data processing. In the field of real-time monitoring system of electric power automation, in order to improve the response speed of the system, real-time database is generally used. Real-time database is the product of the combination of real-time system and database technology, using database technology to solve the data management problems in real-time systems. [0003] In the power automation system, the power system operation data sent by device collection and communication will be placed in the real-time database and refreshed continuously. In order to monitor the real-time changes of power op...
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IPC IPC(8): G06F17/30
Inventor 蒋宏图袁越
Owner HOHAI UNIV