JPH0314143A - Detecting system for abnormality of file - Google Patents

Abstract

PURPOSE:To prevent a data file from becoming abnormal by inspecting a record format and a pointer in a block, and executing read-in from a data file to a sub-buffer secured by a system in the case the other block does not exist on a buffer when the inspected block is referring to the other block. CONSTITUTION:This system is constituted of a block extracting means 20, an abnormality detecting means 30 in a block, a retrieving means 40 of a reference block and a reading-in means 50, etc. In this state, a block number in which a block write-out request exists is extracted, and when an extracted block exists, an inspection in the block is executed, and whether abnormality exists in the block or not is checked, and unless abnormality exists, an inspection of the reference block is executed, and whether abnormality exists in the reference block or not is checked. When abnormality is detected in the block, an editing output request of program information in a memory is executed, and it is outputted. In such a way, in a data base system, the generation of abnormality of a file is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a database file abnormality detection method in an information processing system.

[Conventional technology]

Conventionally, when a file error occurs in a database system, the method for detecting the file error is to start an application program that uses the database file, access the file error location, edit and output the program information in memory at that time, Detection is done through manual investigation and analysis.

[Problem to be solved by the invention]

The conventional method of manually detecting file abnormalities by editing and outputting the program information in memory at the time when the program that accessed the abnormal part of the file ran, (1) There may be a time difference.

(2) The program in which the file abnormality occurred may be different from the program in which the file abnormality was detected.

Therefore, there is a problem in that it is not possible to reliably collect data for investigating the cause of file abnormality.

[Means to solve the problem]

The file abnormality detection method of the present invention includes an extraction means for extracting a block number when writing a block image on a busier onto a disk, and an abnormality detection means for checking whether there is any abnormality in the record format or pointer in the block. A search means for checking whether or not the other block is in the buffer when the inspected block references another block, and a sub-buffer secured by the system when the other block is not in the buffer. and one reading means for reading from a data file.

〔Example〕

Next, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. In the figure, the file abnormality detection method includes a program 10 that makes a buffer write request, an extraction means 20 that extracts a block for which a write request has been made and controls checking for all blocks, and an abnormality that checks whether there is an abnormality in the block. Detecting means 30, searching means 40 for determining whether or not the reference block is in the buffer when a record in the block points to a record in another block; Reading means 50 for reading into a subbuffer secured by the system
, writing means 60 when there is no abnormality in the writing block
, a buffer 70 used by the program 10 for input/output. A sub-buffer 80 into which a reference block is read by the reading means 50, and a data definition 90 referred to by the abnormality detection means 30.
, data file 100, in-memory program information editing/output means 110 in case of file abnormality, output device 1
It consists of 20.

FIG. 2 is a flowchart showing the processing of the above file abnormality detection method. In the same figure, the file abnormality detection method extracts the block number with a block write request (step 210), and if there is an extracted block, it inspects the block (steps 220 and 230) to determine whether there is an abnormality in the block. (step 240), and if there is no abnormality, the reference block is inspected (step 250), and it is checked whether there is an abnormality in the reference block (step 26).
0), if there is no abnormality, inspect the next extraction block.

When the search for all extraction blocks is completed (step 22
0 (NO), writes the block in the buffer onto disk (step 290) and ends the test.

In step 240 or 260, if an abnormality is detected in the block (No in step 240 or step 260), a request is made to edit and output the program information in memory (step 270), and the output is requested in step 28.
0), the inspection process ends.

FIG. 3 is a flowchart of the abnormality detection means 30. First, the data definition is read (step 310), and if there is no abnormality in the pointer and record format (YES in steps 320 and 330), control is transferred to the search means 40 (step 340).

If there is an abnormality in step 320 or 330 above (
If No in step 320 or 330), control is transferred to edit 5 output means 110 (step 350).

FIG. 4 is a flowchart showing the processing of the search means 40 and the reading means 50. When a record in the block to be inspected points to a record in another block (step 41
If the block to be referenced is not on the buffer (YES at step 420), data file 1 is
Read sub-buffer 80 block from 00 (
step 430). Then, the data definition is read (step 440), and if the referenced record is invalid (step 450: No), control is transferred to the editing output means 110 (step 460), and the referenced record is correct (step 450). (YES in step 410) or when no other block is referenced (No in step 410), the extraction means 20
Control is transferred to (step 470).

〔Effect of the invention〕

According to the present invention, it is possible to detect a block in which a file error has occurred when writing from the buffer to the disk, so it is possible to prevent the data file from becoming abnormal, and it is possible to avoid file recovery. can. Furthermore, since the file abnormality generation program and the detection program are the same, it is easy to collect investigation materials for the cause of the abnormality.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a flowchart showing processing, FIG. 3 is a flowchart of the abnormality detection means 30, and FIG. 4 is a flowchart of the search means 40 and reading means 50. . 1...extraction means, 30...abnormality detection means, 40...search means, 50...reading means, 60...writing means , 70...
・Buffer, 80...Sub buffer, 100・
...Data file, 110...Editing output means.

Claims (1)

[Claims] An extraction means extracts the block number when writing a block image on the buffer onto the disk, an abnormality detection means checks whether there are any abnormalities in the record format or pointer within the block, and an abnormality detection means checks whether the inspected block references other blocks. and a reading means for reading from a data file into a sub-buffer secured by the system when the other block is not in the buffer. A file anomaly detection method featuring: