JP2972223B2 - Rollback method for sequential files without journal - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a file recovery process performed for reprocessing when a failure occurs in a program such as a high-level language processing program, a user program, etc. The present invention relates to a rollback method for a journal-less process file that automatically performs a process of restoring an input file and an output file that is a process file (referred to as a sequential data set that has not been journaled; the same applies hereinafter).

[Conventional technology]

Conventionally, in input file recovery processing consisting of sequential files without journals, the program itself positions the record position with respect to the input file (VTOC of the input file).
(Recovery of file position pointer in (Volume Table Of Contents)) to roll back the input file.

Also, in the recovery processing of the output file consisting of the sequential files without journal, the record position could not be positioned (recovery of the file position pointer in the VTOC of the output file) for the output file. Was starting over.

[Problems to be solved by the invention]

In the above-described conventional input file recovery processing that is a journal-less sequential processing file, since the program positions the record position with respect to the input file by itself, there is a disadvantage that the processing in the program becomes complicated.

Further, in the conventional recovery processing of an output file that is a sequential processing file without a journal, there is a fatal drawback that the output file cannot be rolled back because the record position cannot be positioned with respect to the output file.

SUMMARY OF THE INVENTION An object of the present invention is to provide a journal-less sequential processing file rollback method in which an input file and an output file consisting of a journal-less sequential processing file can be automatically rolled back. .

[Means for solving the problem]

According to the rollback method of a non-journaled sequential processing file of the present invention, at least one record of data is input from an input file which is a non-journaled sequential processing file, subjected to necessary processing, and output to an output file which is a non-journaled sequential processing file. When a failure occurs in a transaction, the input file and the output file are rolled back to a state before execution of the transaction. VTOC information updating means for updating a file position pointer indicating a file position pointer and a file position pointer indicating a record position in the file of the output file; and input file position of the input file at the time of starting transaction processing of a program. Calling the VTOC information updating means by passing the interface and the output file position pointer of the output file to update the file position pointer of the input file and the file position pointer of the output file in the VTOC, and File position pointer saving means for saving an input file position pointer of a file and an output file position pointer of the output file to a save area, and an input file position pointer and an output file position saved in the save area when a program failure occurs File position pointer recovery means for calling the VTOC information updating means by passing a pointer and recovering a file position pointer of the input file and a file position pointer of the output file in the VTOC.

[Action]

In the rollback method of the sequential processing file without journal according to the present invention, the VTOC information updating means updates the file position pointer in the VTOC of the input file and the file position pointer in the VTOC of the output file, and the file position pointer saving means stores the program. At the start of the transaction processing, the input file position pointer of the input file and the output file position pointer of the output file at that time are passed and the VTOC information updating means is called, and the file position pointer in the VTOC of the input file and the file in the VTOC of the output file Updates the position pointer and saves the input file position pointer of the input file and the output file position pointer of the output file at that time to the save area, and the file position pointer recovery means saves to the save area when a program failure occurs VT passes the input file position pointer and the output file position pointer has been
The OC information updating means is called to recover the file position pointer in the VTOC of the input file and the file position pointer in the VTOC of the output file.

〔Example〕

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

FIG. 1 is a block diagram showing a configuration of a rollback method of a journal-less sequential processing file according to an embodiment of the present invention. The rollback method of the journal-less sequential processing file of the present embodiment includes a program 1, an input file 2 consisting of a journal-less sequential processing file, an output file 3 consisting of a journal-less sequential processing file, an execution program monitor 4, and an evacuation program. The main part is composed of the area 5.

The execution program monitor 4 includes a file position pointer saving unit 41, a file position pointer recovery unit 42, a VTOC
And an information updating means 43.

Next, the operation of the rollback method of the thus-configured non-journal processed file according to the present embodiment will be described.

The program 1 refers to a series of processing of inputting one processing unit of data (hereinafter, referred to as a transaction) including one or a plurality of records from the input file 2, performing necessary processing, and outputting the processed data to the output file 3. At the start of the same, the file position pointer saving means 41 in the execution program monitor 4 is called.

The file position pointer saving means 41 stores the input file 2
From the file control block (not shown) for the output file 3 and the file position pointer for the output file 3 (hereinafter referred to as the input file position pointer) , Output file position pointer), and passes the obtained input file position pointer and output file position pointer to call the VTOC information updating means 43.

The VTOC information updating means 43 updates the file position pointer in the VTOC of the input file 2 and the file position pointer in the VTOC of the output file 3 with the passed input file position pointer and output file position pointer, respectively. The executed input processing from the input file 2 and output processing for the output file 3 are validated.

In addition, the file position pointer saving means 41 saves the obtained input file position pointer and output file position pointer in the save area 5.

If a failure occurs in the program 1 during the processing of a certain transaction, the processing of the transaction must be redone. Therefore, the program 1 calls the file position pointer recovery means 42 in the execution program monitor 4.

The file position pointer recovery means 42 extracts the input file position pointer and the output file position pointer saved in the save area 5 and passes the extracted input file position pointer and output file position pointer to call the VTOC information updating means 43.

The VTOC information updating means 43 restores the passed input file position pointer and output file position pointer to the file position pointer in the VTOC of the input file 2 and the file position pointer in the VTOC of the output file 3, respectively. It is positioned at the record position of the input file 2 and the record position of the output file 3 at the start of the transaction process currently being processed.

As described above, the rollback processing of the input file 2 and the output file 3 is automatically performed.

〔The invention's effect〕

As described above, according to the present invention, the input file position pointer and the output file position pointer are updated and saved at the start of the transaction processing of the program, and the input file position pointer and the output file position pointer are restored when the program fails. By performing the processing, there is an effect that the complexity of rolling back the input file in the program while being aware of the position of the record position of the input file can be eliminated.

Also, since the file position pointer in the VTOC of the output file is always updated at the start of the transaction processing of the program, the output file can be rolled back and the program must be aware of the position of the record position in the output file. The effect is that there is no need to roll back the output file.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a rollback system of a journal-less sequential processing file according to an embodiment of the present invention. In the figure, 1 ... program, 2 ... input file, 3 ... output file, 4 ... execution program monitor, 5 ... save area, 41 ... file position pointer saving means, 42 ... file position pointer recovery means , 43 ... VTOC information updating means.

Claims (1)

(57) [Claims] When a failure occurs in a transaction for inputting at least one record of data from an input file which is a journal-less sequential processing file, performing necessary processing and outputting the data to an output file which is a journal-less sequential processing file, In a rollback method of a non-journal sequential processing file in which an input file and the output file are rolled back to a state before execution of the transaction, a file position pointer indicating a record position in the input file in the VTOC and a file position pointer of the output file VTOC information updating means for updating a file position pointer indicating a record position in a file; and at the start of a program transaction process, an input file position pointer of the input file and an output file position of the output file at that time. The VOC information updating means is called by passing the location pointer to update the file location pointer of the input file and the file location pointer of the output file in the VTOC, and the input file location pointer and the input file location pointer of the input file at that time. File position pointer saving means for saving the output file position pointer of the output file to the save area; and updating the VTOC information by passing the input file position pointer and the output file position pointer saved to the save area when a program failure occurs. Call means,
A file position pointer recovering means for recovering a file position pointer of the input file and a file position pointer of the output file in a VTOC;