JPH03202956A - Retrieval method for history data - Google Patents

Abstract

PURPOSE:To shorten a retrieval time by saving a data and time at that time, using the table of the date and time as an index and retrieving the date and time form the index when history data is generated and when it is saved in a hard disk and the like. CONSTITUTION:A recording medium consists of the index area of one track and the history data saving area 2 of 3,000 tracks. Namely, history data from a history data buffer on a memory is saved in the history data saving area 2 in a track unit and the index is generated on the memory. For the content of the index, the date is recorded by six bytes from the head in an ASCII code, the number of registration by subsequent two bytes by hexadecimal and time by the ASCII code in four bytes unit the end of one table. At the time of retrieval, retrieval start date and time are inputted and a device being the object of retrieval is inputted so as to retrieve the objective index. Thus, the retrieval time can be shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a historical data retrieval method that is applied, for example, to historical data analysis when a trouble occurs in a system.

(Conventional technology) Conventionally, when analyzing historical data when a problem occurs in a system, it is necessary to directly search for the historical data part of the target date and time from a huge amount of historical data, output it, and analyze it. was.

(Problems to be Solved by the Invention) Conventionally, there has been a problem in that it takes a lot of time to search for a necessary part from a huge amount of historical data.

Therefore, the present invention provides a historical data search method that can reduce the time required for date search and time search by searching the index area for date and time, thereby reducing the time required to search for necessary parts. The purpose is to

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a means for saving history data track by track in a history data save area of a storage medium, and a means for saving history data in units of tracks in a history data save area of a storage medium, and a method for saving history data in units of tracks in a history data save area of a storage medium.

means for saving an index in which the number of registrations and time are recorded in the index area of the storage medium; means for searching the index area saved by this means for a target date, number of registrations and time; and means for searching by this means. The present invention is characterized by comprising means for searching target historical data based on date, number of registrations, and time, and means for reading the historical data searched by this means and searching for a target device.

(Function) When historical data is generated and saved to a node disk, etc., the present invention also saves the date and time at that time, and uses the date and time data as inch 2 soks.
By searching for the date and time from the above-mentioned information, the larger the amount of historical data, the more disk access can be reduced and the search time can be shortened.

(Example) Fig. 2 shows the configuration of a storage medium, for example a node disk, with an index area 1 of 1 track (64 sectors).
and a history data save area 2 of 3000 tracks. That is, the history data from the history data buffer on the memory is saved track by track in the history data save area 2 of the node disk. Then the first
Create an index in memory with the contents shown in the figure.

Figure 1 shows an index table of 256 bytes (bytes
e) is enlarged to show the contents of the memory.

In other words, the contents of the index are AS 6 bytes from the beginning.
■The date (for example, September 25, 1989) in CII code, the next 2 bytes in hexadecimal, ■the number of registrations, and from then on, 4
■Time in byte unit ASCII code (for example, 15:00
0 minutes) and up to the end of one table (256 bytes) (up to 62 items). This index area 1 is 1
Tracks (64 sectors) are secured, and the above table is 6
It is possible to register up to 4 tables and a maximum of 3968 items.

By creating the above-mentioned index, when performing a search, as shown in the processing overview of historical data search in FIG. 3, the search start date and time are entered manually, and the device to be searched is entered to search for the target index.

That is, first, the date in the first 6 bytes of the index table is searched, and if the corresponding date is found, then the time is searched. Then, it counts the registration time of the corresponding time from the beginning of the index, finds out how many tracks from the beginning of the history data on the hard disk the corresponding time is, reads the history data from the corresponding track, and registers the target device. Start your search. Then, the search results for the target device are output and the process ends.

[Effects of the Invention] As described above, the present invention is effective in reducing the time spent on date search and time search when searching a huge amount of historical data spanning several days. Therefore, it is possible to shorten the time required to search for a necessary portion of historical data.

[Brief explanation of drawings]

FIG. 1 is a configuration explanatory diagram showing an example of the contents of an index table according to the present invention, FIG. 2 is a configuration explanatory diagram showing an example of the index area and history data save area of a hard disk according to the present invention, and FIG. 3 is a flowchart illustrating an example of an overview of a historical data search process according to the invention. 1... Index area, 2... History data save area.

Claims (1)

[Claims] means for storing historical data on a track-by-track basis in a historical data storage area of a storage medium; means for storing index information consisting of date, number of registrations, and time of historical data in an index area of said storage medium; means for searching index information of a target date, number of registrations, and time from the index area searched for, a means for searching for target historical data from the index information searched by this means, and a means for reading the historical data searched by this means. 1. A method for searching historical data, comprising: means for searching for a target device.