JPH03137741A - Transaction phase control device - Google Patents

Abstract

PURPOSE:To effectively use system resources by providing a phase control table showing the control state of phase information in respective transaction processes and controlling a generation in a phase information storage area. CONSTITUTION:A phase control means 20 checks whether a transaction process 102 is writing second generation phase information in a transaction process 101 by using the phase control table 30. When the writing of second generation phase information is not completed in the process 101, the process 102 waits for the completion of the writing of second generation phase information. When the writing of phase information completes in the process 101, the process 102 declares that second generation phase information in being written to the table 30 and writes second generation phase information in the process 102 into the phase information storage area 41. The flag of the table 30 which is raised in a previous step is eliminated here, and a processing terminates. Thus, the system resources can effectively be used.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention is utilized in a transaction phase management device of an online transaction system. In particular, it relates to the effective use of phase information storage areas.

〔overview〕

The present invention provides a transaction phase management device that provides a phase management table that indicates the management status of phase information, and reuses the storage area for phase information from one generation ago based on the contents of this table, thereby making effective use of system resources. It has been made possible.

[Conventional technology]

Conventionally, phase management devices for online transaction systems have performed phase management while performing generation management in case the system goes down while writing phase information, but this has resulted in wasteful use of the phase information storage area. Ta.

FIG. 4 is a flowchart showing the operating principle of generation management of a conventional transaction phase management device. Fifth
The figure shows the contents of a phase information storage area of a conventional transaction phase management device.

In FIG. 5, it is necessary to store two generations of phase information, as shown by a pair of phase information 41A, 42A and a pair of phase information 43A, 44A.

The necessity of generation management will be explained with reference to FIG. The phase control of the transaction is carried out as a group from the start to the completion of phase information writing as in step S41, and in step S42 the actual phase information is written in the phase information storage area (this is assumed to be the first generation phase information). Step 34 after the transaction has proceeded
When performing phase control again in Step 3, a failure or system down (S4
If 5) occurs, the current phase information writing has not yet been completed, so if the area written in step 342 is overwritten in step S44, the final phase information will not be found anywhere, so Transaction restart is not possible.

Therefore, the phase information written in step S44 is written as second generation phase information in an area different from the phase information storage area written in step S42. As a result, even if the system goes down in step S45, the transaction can be restarted by reading the first generation phase information in step 346.

By the method shown in FIG. 4, the phase information storage area becomes as shown in FIG. FIG. 5 shows a case where there are two transaction processes 1 and 2 that write phase information.

[Problem that the invention seeks to solve]

However, in such conventional phase management devices, phase management is performed while performing generation management in consideration of the possibility that the system goes down while writing phase information. left in vain,
There were problems in effective management of system resources.

The present invention solves the above problems, and aims to provide a transaction phase management device that can effectively utilize system resources.

[Means for solving problems]

The present invention provides a plurality of transaction processes, a phase information storage area for storing phase information of each transaction process, and phase management for performing generation management on phase information from each transaction process and storing it in the phase information storage area. The transaction phase management device includes a phase management table that indicates the management state of phase information of each transaction process, and the phase management means controls the phase information storage area in the phase information storage area based on the contents of the phase management table. It is characterized by including means for performing generation management and reusing a storage area for phase information of one generation before.

[Effect]

A phase management table is provided that indicates the management status of phase information of each transaction process.

The phase management means performs generation management in the phase information storage area based on the contents of this phase management table, and also reuses the phase information storage area of one generation before to store the phase information. The above operations enable effective use of system resources.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings. 1st
The figure is a block diagram of a transaction phase management device according to an embodiment of the present invention. In FIG. 1, the transaction phase management device includes a plurality of transaction processes 10. ．． 10□, and a phase information storage area 4 that stores phase information of each transaction process 10.
0, and a Funnies management means 20 that performs generation management on phase information from each transaction process 10 and stores it in a phase information storage area 40.

Here, the present invention is characterized by comprising a phase management table 30 indicating the management status of phase information of each transaction process 10, and the phase management means 30:
The purpose of the present invention is to include means for reusing the phase information storage area of the previous generation, which does not interfere with generation management in the phase information storage area 40, based on the contents of the phase management table 30.

The operation of the transaction phase management device having such a configuration will be explained. FIG. 2 is a diagram showing the contents of the phase information storage area of the transaction phase management device of the present invention. FIG. 3 is a flowchart showing the operation of the phase management means of the transaction phase management device of the present invention.

A detailed explanation will be given focusing on how the phase information storage area shown in FIG. 3 becomes according to this embodiment.

This embodiment focuses on the fact that once the phase information writing in step S44 shown in FIG. 4 is completed, the phase information storage area written in step S42 can be reused.

The phase information storage areas 41, 42, and 43 shown in FIG. 2 are the phase information storage areas 41A and 4 shown in FIG. 5, respectively.
Compatible with 2A and 43A.

When the transaction process 2 writes second generation phase information, conventionally it would write to the phase information storage area 44A shown in FIG. 5, but in this embodiment it overwrites it to the phase information storage area 41A shown in FIG. 2. do. This situation will be explained in detail using FIG.

In FIG. 3, the phase management means 20 first uses the phase information management table 30 to check whether the transaction process 2 is writing second generation phase information in the transaction process 1 (S31).

If writing of the second generation phase information has not been completed in transaction process 1, transaction process 2 waits for transaction process 1 to complete writing of phase information. Transaction process 1
If writing of the phase information has been completed in , the transaction process 2 first declares to the phase management table 30 that it is writing the second generation phase information (532), and stores the phase information storage area shown in FIG. 4
The second generation phase information of transaction process 2 is written to 1 (S33). The flag in the phase management information table 3° set in step S332 is cleared in step S34, and the process ends.

As mentioned above, in this embodiment, the phase information storage area is approximately 3
Since it can be reduced to /4, system resources can be used effectively.

It is unlikely that a situation will occur frequently where transaction phase information is written to the same phase information storage area and one transaction process is forced to wait, so there will be no reduction in performance.

〔Effect of the invention〕

As explained above, the present invention has the excellent effect of effectively utilizing system resources.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a transaction phase management device according to an embodiment of the present invention. FIG. 2 is a diagram showing the contents of the phase information storage area of the transaction phase management device of the present invention. FIG. 3 is a flowchart showing the operation of the phase management means of the transaction phase management device of the present invention. FIG. 4 is a flowchart showing the operating principle of generation management of a conventional transaction phase management device. FIG. 5 is a diagram showing the contents of a phase information storage area of a conventional transaction phase management device. 10,. 10□・・・Transaction process, 2o
...Face management means, 30... Phase management table, 40... Phase information storage area, 41.41A
... Phase information storage area of transaction process 1 (first generation), 42.42A... Phase information storage area of transaction process 1 (second generation), 4
3.43A... Phase information storage area for transaction process 2 (first generation), 44A... Phase information storage area for transaction process 2 (second generation)
.

Claims (1)

[Claims] 1. A plurality of transaction processes, a phase information storage area for storing phase information of each transaction process, and generation management of the phase information from each transaction process to the phase information storage area. A transaction phase management device comprising: a phase management table that indicates a management state of phase information of each transaction process, and the phase management device stores the phase information based on the contents of the phase management table. A transaction phase management device characterized by comprising means for managing generations within a storage area and reusing a storage area for phase information of one generation before.