JPH0120451B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to system down events caused by software logic failures that occur during transaction execution, that is, data inconsistencies, pure program logic errors, and interface errors. This invention relates to a software logical fault relief method for avoiding the problem.

Conventional technology In the past, when a software logical failure occurred during the transaction execution process, the system was generally brought down, the failure information was collected and analyzed, the causative transaction was isolated, and the system was prevented from restarting the system. After that, I restarted the system.

In the case of conventional systems, the scale of the service functions provided is small and the social impact is small, so software logical failures that occur due to the execution of specific transactions are treated as system failures, and the recovery time after failure is minimized. We are dealing with this by shortening it. Therefore, conventionally, the entire service provided by the system is interrupted, ie, the system goes down frequently. As a result, this has resulted in significant losses for system users and a sense of distrust in the system.

OBJECTS OF THE INVENTION An object of the present invention is to provide a software logical failure relief method that limits the scope of service interruption to the transaction that causes the failure and eliminates service interruption for the entire service provided.

Composition of the Invention The method of the present invention includes a table rescue means that restores the memory contents that were updated during the execution of the corresponding transaction due to the occurrence of a software logical error to the state before the update as part of invalidating the transaction, and and transaction invalidation means for invalidating the transaction.

Embodiments of the Invention Next, the present invention will be described in detail with reference to the drawings. Referring to FIG. 1, the first embodiment of the present invention is comprised of table rescue means and transaction invalidation means.

Referring to FIG. 2, the table rescue means includes a transaction input section 1, a transaction execution section 2, a table access section 6, a memory storage section 7, an exclusive control section 8, a pre-update image storage section 9,
It is composed of a relief processing section 4 and a table relief section 10. Referring to FIG. 3, the transaction invalidation means is composed of a transaction input section 1, a transaction execution section 2, a common interface area section 3, a relief processing section 4, and a transaction invalidation section 5. . Next, the operation of the first embodiment will be explained in detail. Referring to FIG. 2, in the table rescue means, a transaction execution unit 2 operates in response to a transaction input 21 from a transaction input unit 1. The transaction execution unit 2 makes a request 22 to the table access unit for a table based on the memory storage method that the transaction execution unit 2 wishes to refer to or update. The table access unit 6 issues an exclusive use request 23 to the exclusive control unit 8 in order to exclusively use the requested table. The exclusive control unit 8 performs a usage permission 24 if no other transaction execution unit 2 is in use. Next, the table access unit 6 performs reference 25 and update 27 of the requested table. The table access section 6 transfers 26 the table contents to the pre-update image storage section 9 before updating the requested table. Next, the reference and update results are returned 28 to the transaction execution unit 2. On the other hand, the relief processing section 4 is activated 29 due to the occurrence of a software logic failure during the operation of the transaction execution section. If the system requires table relief, the relief processing section 4 activates the table relief section 30. The table rescue unit 10 extracts 31 the memory table before-update image from the table-before-update image storage unit 9 . Next, the extracted pre-update image is passed to the table access unit 6 for reference and update, thereby restoring the table to the state before the start of the transaction. A system that only requires table rescue means then uses transaction invalidation means to execute from the next transaction. Next, details of one embodiment of the operation of the transaction invalidation means will be described below.

Referring to FIG. 3, in the transaction invalidation means, the transaction execution unit 2 operates in response to a transaction input 21 from the transaction input unit 1. Before starting processing, the transaction execution unit 2 transfers 22 the return address when a logical failure occurs and information for reporting the status of logical failure to the common interface area unit 3. When a software logical failure occurs during execution of a transaction, the relief processing section 4 is activated 23. The relief processing unit 4 transfers 24 the transaction identification that caused the activation to the common interface area unit 3. In other words, it is possible to reject the same transaction that occurs thereafter. Next, the relief processing unit 4 activates 25 the transaction invalidation unit 5. The transaction invalidation unit 5 receives the return address from the common interface area unit 3 26
I do. Next, the transaction invalidation unit 5 performs a return 27 to the position of the return address.

Regarding unconditional invalidation as in this embodiment, there is also a method in which the transaction execution unit 2 selects whether invalidation is possible or not depending on the conditions at the time of transaction execution, and it is possible to select invalidation of the transaction or system down. .

Referring to FIG. 1, the second embodiment of the present invention is comprised of a file rescue means and the transaction invalidation means. Referring to FIG. 4, the file rescue means includes a transaction input section 1, a transaction execution section 2, a file access section 11, an exclusive control section 8, a disk file 12, a pre-update image storage section 9, and a rescue processing section 4. , a file rescue section 13. The structure of the transaction invalidation means is the same as that of the transaction invalidation means of the first embodiment. Next, the operation of this embodiment will be explained in detail.

In the file rescue means, a transaction execution unit 2 operates in response to a transaction input 21 from a transaction input unit 1. The transaction execution unit 2 requests the file access unit 11 for the record identification ID of the disk file to be referenced or updated 22. The file access unit 11 issues an exclusive use request 23 to the exclusive control unit 8 in order to exclusively use the requested record. If there is no other transaction execution unit 2 in use, the exclusive control unit 8 performs usage permission 24. Next, the file access unit 11 performs reference 5 and update 7 of the requested record. The file access unit 11 transfers the record contents to the pre-update image storage unit 9 26 before updating the requested record. Next, the reference and update results are returned to the transaction execution unit 28
I do. On the other hand, when the transaction execution section is operating, the relief processing section 4 is activated 29 due to the occurrence of a software logical failure. If the system requires file relief, the relief processing section 4 activates the file relief section 13 (30). The file rescue unit 13 extracts 31 the image before file update from the image before file update storage unit 9 . Next, the extracted pre-update image is passed to the file access unit 11 for reference and update, thereby restoring the file to the state before the start of the transaction. A system that only requires file rescue means then uses transaction invalidation means to execute from the next transaction onwards. The details of the operation of the transaction invalidation means are the same as the transaction invalidation means of the first embodiment.

Referring to FIG. 1, a third embodiment of the present invention includes:
It consists of a relief information collection means and the transaction invalidation means. Referring to Figure 5,
The relief information collection means includes a transaction execution section 1, a common interface area section 3, a relief processing section 4, a relief information collection section 14, a memory storage section 7, a display section 15, and a secondary storage section 16. . The structure of the transaction invalidation means is the same as that of the transaction invalidation means of the first embodiment. Next, the operation of this embodiment will be explained in detail.

The relief information collection means is such that, before the transaction execution unit starts operating, the transaction execution unit 2 identifies the information desired to be collected in the common interface area unit 3.
21. Next, since a software logical fault has occurred during transaction execution, the relief processing section 4 is activated 22. The next relief processing section 4 is activated 3 of the relief information collection section 14 . The relief information collection unit 14 extracts 24 the information identification that the corresponding transaction execution unit 2 desires to collect from the common interface area unit 5 . Next, the relief information collection unit 14 extracts target information 2 from the memory storage unit 7.
Do step 5. Next, the relief information collection section 14 outputs the extracted information to the display section 26 and the secondary storage section 27. A system that only requires a relief information collection means then uses a transaction invalidation means to execute from the next transaction. The details of the operation of the transaction invalidation means are the same as the transaction invalidation means of the first embodiment.

Although the above-mentioned embodiment is an example in which each relief means is used individually, it is also possible to implement the relief means of the first to third embodiments in combination depending on the necessity of the system.

Effects of the Invention The present invention has the effect of being able to eliminate or minimize system downs caused by software logical failures of various causes by equipping various information processing systems with this software logical failure relief method.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the first, second and third embodiments of the present invention, FIG. 2 is a diagram showing the table rescue means in FIG. 1, and FIG. 3 is a diagram showing the transaction invalidation means in FIG. 1. 4 is a diagram showing the file rescue means of FIG. 1, and FIG. 5 is a diagram showing the rescue information collection means of FIG. 1. 1 to 5, 1...transaction input section, 2...transaction execution section,
3...Common interface area section, 4...Relief processing section, 5...Transaction invalidation section, 6...
...Table access section, 7...Memory storage section, 8
...exclusive control unit, 9...pre-update image storage unit,
10...Table relief section, 11...File access section, 12...Disk file, 13...File relief section, 14...Relief information collection section, 15...
...display section, 16...secondary storage section.

Claims (1)

[Scope of Claims] 1. Execution means for sequentially executing each transaction, and relief means for restoring the contents of memory updated by the transaction that caused the fault to the state before the update when a software logical fault occurs. and registration means for registering, in a registration unit, identification information of the transaction that caused the logical failure when the software logical failure occurs; control means for checking whether the identification information of is registered in the registration unit and instructing the execution means to start executing the transaction only if the identification information is not registered. Disability relief method.