JP2003006011A - Method for taking over journal merge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain continuous results in the following batch works even when transaction processings of a user are performed among a plurality of data processing systems. SOLUTION: The respective journals of processors (a), b are stored in journal data sets 11, 13, both journals are merged in a journal merge part 71 and stored in a data base 14. In the case of switch of control from a data processing system A1 at a transiting origin to a system B2 at a transiting destination, operating environment information and unprocessed journals (for example, the journal of the data processor b) which are not merged are stored in a take-over data set 15, they are transmitted to a take-over data base 25 of the system B2 at the transiting destination, pieces of the operating environment information of systems A, B are combined together, merge between journals of the unprocessed journal and a processor d at the transiting destination corresponding to the processor (a) at the transiting origin is performed and merge of journals of processors c, d at the transiting destination is performed after completion of the unprocessed journal in a journal merge part 81 of the system B2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a journal for realizing continuity of journals acquired for each of a plurality of corresponding data processing devices in an operation of migrating a user's transaction processing between two data processing systems. Regarding the merge takeover method.

[0002]

2. Description of the Related Art Conventionally, a system for switching between two data processing systems to continue user transaction processing has been constructed for the purpose of disaster prevention in financial online systems such as banks and securities. It is placed in a remote place and the database update information is sent from the active data processing system to the standby data processing system, and the standby data processing system updates the database almost at the same time so that the database updates are always synchronized. In other words, there is a method in which an active data processing system replaces a user's transaction processing with a standby data processing system when a failure occurs and continues business. In this case, after changing the data processing system, user-specific batch job processing (hereinafter referred to as batch job) that is a post-process
Will also be executed at the replacement destination, but batch work must be a continuous series of processes before and after the system replacement.
However, even if the data processing system is non-stop, there is no way to realize the series of journals acquired by each data processing device that is the input of the batch job. I can't continue.

[0003]

In the prior art, when migrating online transaction processing between data processing systems, the migration source stops all the data processing devices that are in operation, and when the stop is confirmed, the subsequent processing is continued. It is necessary to activate the data processing device of the migration destination. In this case, there is no means for migration in a different system in journal merge processing between data processing systems, but since the subsequent batch job uses the merge journal as input, the batch job also ensures continuity between the migration destination and the migration source. There is no description about that. An object of the present invention is to ensure the continuity of batch operations between a migration destination and a migration source when migrating online transaction processing between data processing systems.

[0004]

In order to solve the above problems, the present invention provides a plurality of data processing devices having an online transaction processing unit and a shared monitoring unit, and a shared database referred to and updated by each of the data processing devices. When,
A data set (hereinafter referred to as a journal data set) that stores log information (hereinafter referred to as a journal) output by each data processing device, and a journal is acquired from each journal data set and merged and output in chronological order And a second data processing system having a journal merging unit for transferring the update information of the database of the first data processing system to the second data processing system, and based on this update information, the first data processing system is transferred to the second data processing system. By updating the database of the second data processing system, the contents of the database are always matched between the data processing systems, and the transaction to the second data processing system is triggered by the stop of the data processing device of the first data processing system. By transferring processing, continuous online transactions between different data processing systems are possible. This is a journal merge takeover method in an online transaction processing system that performs transaction processing, in which environment information for operating the journal merge section of the first data processing system is stored in a dataset (hereinafter referred to as a takeover dataset) The contents of the set are transferred to the takeover data set of the second data processing system at the time of the transition of the transaction processing, and the journal merge unit of the second data processing system activated after the transfer is completed is the operating environment of the transfer source and the transfer destination. The journals acquired by the respective data processing devices are merged in chronological order. Further, when the transaction processing is transferred to the second data processing system triggered by the stop of the data processing device of the first data processing system, a journal that has not been merged by the journal merge unit (hereinafter referred to as an unprocessed journal) If there is any journal data set, the journal merge unit stores the unprocessed journal in the takeover data set, and the contents of this takeover data set are transferred to the takeover data set of the second data processing system at the time of transaction processing transition. After the activation of the second data processing system, the journal merging unit of the second data processing system takes over the transaction processing of the data processing device of the first data processing system which has not output the unprocessed journal. Data processing of the second data processing system And the journal that location is output,
After inputting the unprocessed journal transferred to the takeover data set and merging, the transaction processing of the data processing unit of the first data processing system that has not output the unprocessed journal is taken over after the input of the unprocessed journal is completed. The second data processing that inherits the transaction processing of the data processing apparatus of the second data processing system that is output and the transaction processing of the data processing apparatus of the first data processing system that outputs the unprocessed journal The journal output by the data processor of the system is input and merged.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the present invention will be outlined with reference to FIG. Before explaining FIG. 5, FIG. 4 will be described. FIG. 4 schematically illustrates the migration of online transaction processing between conventional data processing systems. The source system A stops all the operating data processing devices a and b, and when the stop is confirmed, the subsequent data processing devices c and d of the target system B are activated. In this case, if there is a journal of the data processing device a or b that has not been processed in the journal merge process in the migration source system A, the migration source system A
Does not transfer the unprocessed journal from the system B to the transfer destination system B. For this reason, there is no continuity between the migration source and the migration destination merge journal, and there is also no continuity between the migration source and migration destination badge operations that use the merge journal as an input.

Next, FIG. 5 will be described. In the data processing system (system A), a plurality of data processing devices a,
Since b is operating, the journal merge processing of the data processing device x inputs the journals a and b (5-1). When migrating the data processing system, if one system a of the plurality of data processing devices a and b of the migration source is stopped, the operating environment information of the data processing device a is stored in the transfer source takeover data set to be inherited to the migration destination. If there is an unprocessed journal that has not been subjected to journal merge processing in the data processing device b other than the stopped migration source data processing device a, it is taken over to take over the above-mentioned takeover data set and unprocessed journal to the migration destination. Store in dataset (5-
2). After all the data processing devices of the migration source have stopped and the unprocessed journals of the migration source have been stored, the data processing device x
The journal merge process of is stopped. Thereafter, the data processing device x separately processes the takeover data set (including the unprocessed journal, if any) to the transfer destination takeover data set of the migration destination, and the data processing device y of the migration destination performs the data transmission process. By the receiving process, the transfer data set and the unprocessed journal are stored in the transfer destination transfer data set. (5-3).

The journal merge process of the data processing device y is started after the data transfer of the takeover data set from the migration destination is completed, and is acquired from the data processing devices a and b of the migration source based on the information from the takeover data set. The settings are reprinted so that the journals acquired from the data processing devices c and d of the transfer destination corresponding to the journals are a series. If there is an unprocessed journal at the migration source, the operating environment information of the migration-destination data processing device d corresponding to the migration-source stopped data processing device b is switched, and the unprocessed journal is input from the takeover data set. The journal merge processing with the journal of the processing device c is continued (5-4). When the unprocessed journal ends, all the journals on the system A side have been input, so the input from the unprocessed journal is stopped and the journal from the data processing device c of system B is input. (5-5) When the journal of the corresponding migration destination data processing device d is detected by the journal input from the data processing device c, the operating environment information is switched to the data processing device d and the journal is input to continue the journal merge process. Achieve by (5-6).

Next, an embodiment will be described with reference to FIGS. 1, 2 and 3. FIG. 1 is an embodiment showing a journal merge takeover method for merging journals between different data processing systems. The migration source data processing system A (1) and the migration destination data processing system B (2) constitute an online transaction processing system. The data processing system A (1) of the migration source has an online transaction processing unit (32, 42) and an online shared monitoring unit (3), respectively.
Two data processing devices a, b (3, 4) consisting of 1, 41),
It is composed of a data processing device x (7) including a journal merge section (71) and a data transfer transmission section (72). The online shared monitoring unit (31, 41) is connected to a plurality of online transaction processing units (32, 4) via the monitor data set (10).
After observing the time series of the transactions processed in 2) and establishing the relative time series order of the processed transactions between the data processing devices a and b, the online transaction processing unit ( 32, 42). Online transaction processing unit
(32, 42) adds the time-series information of the processed transaction to the journal and outputs it to the online journal data sets (11, 13) of the data processing devices a, b (3, 4), respectively. Further, the online sharing monitoring section (31, 41) manages lock information for performing exclusive processing when the plurality of online transaction processing sections (32, 42) access the shared database (12). A method in which a plurality of data processing devices access a shared data resource (shared database) while performing exclusive control in block units is disclosed in, for example, Japanese Patent Laid-Open No. 57-64850 and Japanese Patent Laid-Open No. 57-648.
As disclosed in Japanese Patent Laid-Open No. 61-61, it is known that a plurality of host computers are connected by a communication device to exchange lock information, and a description of exclusive control will be omitted.

The journal merging unit (71) inputs the journals of the online journal data sets (11, 13) output by the data processing devices a, b (3, 4) and makes transactions based on the time series information in the journals. Merge journals in units and output the merged result to merge journal data set (14). JP-A-63-201846 is known as a method of merging journals acquired by a system in which a database is shared by a plurality of data processing devices, and therefore a description of the merge processing method will be omitted. The merge journal acquired in the merge journal data set (14) becomes input information for user-specific batch business processing, such as information system business processing, in a subsequent process. It is also used for database recovery processing when the shared database is damaged. The takeover data set (15) stores the environmental information for the migration work in order to notify the migration destination of the environmental information of the data processing system A (1) in which the journal merge section (71) operates.

FIG. 9 shows the format of the takeover data set. The takeover data set is composed of takeover information and an unprocessed journal, but the unprocessed journal may not be stored in another data set and may not exist. The environment information for migration work stored in the takeover information includes the number of data processing devices (9-1), data processing device identification ID (9-2), and data processing device configuration information (9-3-1 to 9-3- n), the journal merge section takeover information (9-4). Number of data processing devices (9-
1) stores the number of data processing devices that configure the migration source data processing system and are set to share the database. The data processing device identification ID (9-2) is identification information set in the migration source data processing device, and is stored in the order set in the online shared monitoring unit of each data processing device. The online configuration information of the data processing device (9-3-1 to 9-3-n) is the online configuration information of each data processing device required for system migration, and the migration destination journal merge section can Check the composition and reprint. The storage order of the data processing device configuration information is the data processing device identification.
Match the order of IDs. Journal merge section takeover information (9
-4) stores operating environment information for reproducing the operation state of the journal merge unit in the migration destination journal merge unit. The unprocessed journal is stored in the takeover data set if the unprocessed journal is not provided with another data set for the unprocessed journal for storing the unprocessed journal.

The data processing system B (2) of the migration destination is equivalent to the data processing system A (1) of the migration source, and the online transaction processing units (52, 62) of the data processing devices c, d (5, 6). , And an online shared monitoring unit (51, 61), a journal merge unit (81), and a data transfer receiving unit (82), and a data processing device y (8). Each online transaction processing unit has a shared database.
Access (22), record the result as a journal, and output it to the online journal dataset (21, 23).
The journal merge unit (81) inputs the journals of the online journal datasets (21, 23) and outputs the merge result to the merge journal dataset (24). Further, the journal merge section (81) inputs the migration source environment information from the takeover data set (25).

When the data processing system A (1) of the migration source is in operation, the data processing system B (2) of the migration destination is operated as a backup system to update the shared database (22) the same as the migration source. Therefore, when the migration source shared database (12) is updated, the database update information transmission unit (33, 43) transmits the updated content to the migration destination as reflection information and the reflection information is transmitted to the migration destination database update information reception unit.
When received at (53, 63), the updated contents are reflected in the database at the backup system at the migration destination. The backup system activates the database update transaction when the online transaction processor (52, 62) of the data processor (5, 6) receives the reflection information by the database update information receiver (53, 63), and the shared database ( twenty two)
It is realized by updating. However, the backup control method at the time of operation of the migration source is not the subject of this patent, and thus its details are omitted.

When the migration source data processing system A (1) is terminated and control is switched to the migration destination data processing system B (2), the operating environment information is taken over by the inherited data set ( It is necessary to instruct in advance to store it in 15). The operating environment information includes the configuration definition information of each of the data processing devices a, b (3, 4) of the migration source, which is necessary for continuing the journal merge process, and the journal merge unit (7
It is composed of the status information of 1). Journal merge department (71)
Is required to detect the stop of the online transaction processing unit (32, 42) by the input file end information of the journal, so that the data processing system shifts before the data processing devices a, b (3, 4) actually stop. Need to tell. An example of a method of instructing the journal merge unit (71) to shift the data processing system is shown below. Before the data processing devices a, b (3, 4) actually stop, the data processing system migration command is input from the system console device of the data processing device x (7) to the journal merge unit (71) to make the online transaction processing unit. A method that starts the data processing system migration when the stop of (32, 42) is detected. When it is known that the data processing system is to be migrated before the journal merge unit (71) is started, a method for designating the data processing system transfer by a control statement instructing the start and processing method of the journal merge unit. A command is issued to the online transaction processing part (32, 42) to instruct the migration between the data processing systems of the journal merge part, it is stored in the online journal data set as journal information, and this journal is input by the journal merge part. There is a method of instructing the data processing system migration by doing so.

FIG. 6 shows a flowchart of the ending process of the data processing system transfer source. When the journal merge unit of the migration source is instructed to migrate the data processing system and the online transaction processing unit of the migration source stops, and then the transaction is processed by the corresponding online transaction processing unit of the migration destination data processing system (Fig. 1) Enter the journal (6-1), and as a result, if the end of the journal is judged (6-2) and the end is not detected, the input journal is merged (6-3) and the merge result is merged journal data. Output (6-4) to the set and input (6-1) the next journal. Journal end judgment (6-
If the end of the journal is detected in 2), the online transaction part has already stopped, so it is judged whether there is an instruction (6-5) to transfer between the journal merge data processing systems, and the transfer instruction is issued. If not, stop the input from the online journal data set that detected the end of the journal (6-6) and input the next journal from the online journal data set of another data processing device.
Do (6-1). If there is an instruction (6-5) to migrate the journal merge section between data processing systems, store the journal merge operating environment information in the takeover data set (6-7),
Detect end of all online journal datasets
(6-8) Check if you did. If there is a journal that has not been input, the unprocessed journal is output because the end of the online journal data set has not been reached, so the online journal data set (in the figure, it is the online journal data set of the data processing device b).
Enter the journal of (6-9). This, journal input
Also in (6-9), it is judged whether the end is detected (6-10). If the end of the journal is not detected, an unprocessed journal is output to the transfer source takeover data set. Power (6-11). When the end of the journal is detected, the input from that data set is stopped (6-12) and the next journal is input (6-9) from the online journal data set of another data processing device. When the end is detected in all online journal data sets (6-8), the data transfer transmission unit is started (6-13)
To stop the journal merge section (6-14).

FIG. 7 shows a flowchart of the data transfer / transmission unit. When the data transfer / transmission unit is activated in the migration source journal merge unit, initialization processing (7-1) is performed to establish a line.
Then, (7-2), and the data transfer receiving unit of the migration destination is activated (7-3).
In order to transfer the contents of the takeover data set to the destination takeover data set, input the takeover information from the takeover data set (7-4) and detect the end of the data set (7-5)
Send (7-6) until you do. After sending the takeover information, check whether there is an unprocessed journal (7-7), and if there is an unprocessed journal, check the destination (7-8), and then enter the unprocessed journal from the taken over data set (7 -9) and transmit (7-11) until the end of the data set is detected (7-10). Detects the end of unprocessed journals in the takeover data set (7-1
If 0) or there is no unprocessed journal (7-7), the line is disconnected (7-12) and the termination processing (7-13) is performed to end the data transfer.

The journal merging unit of the migration destination data processing system is transferred from the migration source to the data of the inherited data set and stored in the inherited data set of the migration destination, and is activated by the data transfer receiving unit after the data transfer is completed. , Read the operating environment information from the takeover data set, and compare it with the operating environment information acquired from the online transaction processing unit in operation at the migration destination. The online transaction processing unit that continues the journal is determined by imprinting so that the definition order of the migration source online sharing monitoring unit and the definition order of the migration destination online sharing monitoring unit match. For example, in the data processing system A (1), the online shared monitoring unit
The definition order of (31, 41) is the order of the data processing device a (3) and the data processing device b (4), and the definition order of the online shared monitoring unit (61, 51) of the data processing system B (2) is In the order of the data processing device d (6) and the data processing device c (5), the data processing device a (3) is replaced by the data processing device d (6) and the data processing device b (4) is replaced by the data processing device c. Recognize that (5) is the corresponding online.

FIG. 8 shows a flowchart of the start processing of the data processing system migration destination journal merge section. In the operation of continuing the journal merge processing from the migration source in the migration destination data processing system, it is confirmed whether there is the handover information of the migration source journal merge part transferred to the handover data set (8-1). If there is no takeover information or no takeover data set is specified in the control statement for activating the journal merge process, it is recognized as the first journal merge process and the first merge process (8-2) is performed and all the environmental information To initialize. If the takeover data set is specified and there is takeover information, enter the takeover information (8-3). Corresponds to the online transaction processing part of the migration source The online transaction processing part of the migration destination corresponds to the online transaction processing part of the migration source input from the takeover data set (8-4). Print the operation information of the online transaction processing part of the migration destination (8-5). Check whether there is an unprocessed journal of the migration source in the takeover data set (8-6). If there is no unprocessed journal, start processing ends. After that, the merge processing is continued with the journal acquired from the migration destination online transaction processing unit.

If there is an unprocessed journal in the migration source unprocessed journal confirmation (8-6), the unprocessed journal transferred to the takeover data set is input (8-7). When the end of the data or the end of the unprocessed journal is detected in the input of the unprocessed journal (8-8), it is recognized that the online transaction process of the migration source has stopped and the unprocessed journal from the corresponding online transaction process Stop the input (8-9), check the corresponding online transaction processing part of the migration destination, collate the operating environment information and set it so that the journal of the migration destination online transaction processing can be input (8-10). The start process ends.

When the end of the unprocessed journal is not detected (8-8) and the unprocessed journal is normally input (8-8), the journal acquired by the online transaction process of the migration destination to be merged is operating Input (8-11) from the processor journal data set. When the end of the data or the end of the journal is detected in the input of the journal acquired by the online transaction processing during operation (8-12), it is recognized that the migration destination online transaction processing has stopped, and the corresponding online transaction processing Stop the journal input of (8-13). At this time, if all the online transaction processing including the unprocessed journal has stopped (8-14), the end processing of the journal merge processing (8-15) is performed and the journal merge unit is ended. If the unprocessed journal and the journal acquired in the online transaction process in operation are input correctly, merge processing (8-16) is performed, the merge journal is output to the merge journal data set (8-17), and the unprocessed journal is input. Return to (8-7). This is achieved by repeating the above until all online migration is completed.

Next, a second embodiment will be described with reference to FIG. In the embodiment shown in FIG. 1, the storage destination of the unprocessed journal is separated from the takeover data set (15), the unprocessed journal data set (16) is set, and the takeover data set (15) is set.
Similarly, the journal merge unit (71) activates the data transfer transmission unit b (73) for the unprocessed journal data set (26) in the transfer destination data processing system B (2), and Send. The data processing device y (8) of the transfer destination receives the unprocessed journal at the data transfer receiving unit b (83) and stores it in the unprocessed journal data set (26) corresponding to the transfer source. Journal merge department of migration destination (81)
Input from the unprocessed journal data set (26) instead of inputting the unprocessed journal from the takeover data set (25). As a result, since the data transfer of the journal merge process takeover information to the migration destination can be performed in parallel, the waiting time for starting the journal merge process of the migration destination can be shortened.

Next, a third embodiment will be described with reference to FIG. In the embodiment shown in FIG. 2, the unprocessed journals are stored in the unprocessed journals of the data processing device a (3) as unprocessed journal data sets a (16), and the data processing device b is processed.
The unprocessed journal of (4) is stored separately in the unprocessed journal data set b (17) for each data processing device, and is stored in the data processing system B (2) of the migration destination similarly to the takeover data set (15). Processing journal data set a, b (26,
Send data transfer to 27). Further, the journal merge unit (81) of the transfer destination inputs from the unprocessed journal data sets a and b (26, 27). As a result, when the number of data processing devices further increases, the input journals are copied in parallel, whereby the processing time required for the transition of the journal merge processing can be shortened. Also, as another usage,
When the unprocessed journal cannot be stored only with the specified unprocessed journal data set larger than expected, by allocating it as a spare data set, it is possible to avoid the unmovable state due to the overflow of the unprocessed journal data set.

[0022]

As described above, according to the present invention, even when a user's transaction processing is performed between a plurality of data processing systems, the subsequent batch jobs are continuously performed without being aware of the interruption of the system. There is an effect that the result can be obtained.

[Brief description of drawings]

FIG. 1 is a diagram showing a first embodiment of a journal merge takeover method for merging journals between data processing devices having different data processing systems.

FIG. 2 is a diagram showing a second embodiment of the journal merge takeover method.

FIG. 3 is a diagram showing a third embodiment of the journal merge takeover method.

FIG. 4 is a diagram schematically showing migration of online transaction processing between conventional data processing systems.

FIG. 5 is a diagram for schematically explaining the present invention.

FIG. 6 is a diagram showing a flowchart of termination processing of a data processing system migration source.

FIG. 7 is a diagram showing a flowchart of processing of a data transfer / transmission unit.

FIG. 8 is a diagram illustrating a flowchart of a start process of a data processing system migration destination journal merge unit.

FIG. 9 is a diagram showing the contents of a takeover information data set.

[Explanation of symbols]

1, 2 Data processing system 3, 4, 5, 6, 7, 8 Data processing device 10, 20 Monitor data set 11, 13, 21, 23 Online journal data set 12, 22 Shared database 14, 24 Merge journal data set 15 , 25 Takeover data set 16, 17, 26, 27 Unprocessed journal data set 31, 41, 51, 61 Online shared monitoring unit 32, 42, 52, 62 Online transaction processing unit 33, 43 Database update information transmission unit 53, 63 Database update information receiver 71, 81 Journal merger 72, 73, 74 Data transfer transmitter 82, 83, 84 Data transfer receiver

Claims (6)

[Claims] 1. A plurality of data processing devices having an online transaction processing part and a shared monitoring part, and a shared database which is referred to and updated by each of the data processing devices.
A data set (hereinafter referred to as a journal data set) that stores log information (hereinafter referred to as a journal) output by each data processing device, and a journal is acquired from each journal data set and merged and output in chronological order And a second data processing system having a journal merging unit for transferring the update information of the database of the first data processing system to the second data processing system. By updating the database of the second data processing system, the contents of the database are always matched between the data processing systems, and the transaction to the second data processing system is triggered by the stop of the data processing device of the first data processing system. By transferring processing, continuous online transactions between different data processing systems are possible. In an online transaction processing system for performing a transaction processing, environment information for operating the journal merge section of the first data processing system is stored in a data set (hereinafter referred to as a takeover data set), and the contents of the takeover data set are The journal merge unit of the second data processing system, which is transferred to the takeover data set of the second data processing system at the time of transition of the transaction processing and is activated after the transfer is completed, reconciles the operating environments of the transfer source and the transfer destination with each other. A method for taking over a merged journal, characterized in that the journals acquired by the respective data processing devices are merged in chronological order. 2. The journal merge takeover method according to claim 1, wherein when the transaction processing is transferred to the second data processing system triggered by the stop of the data processing device of the first data processing system, the journal merge When there is a journal that has not been merged by a copy unit (hereinafter referred to as an unprocessed journal) in any of the journal data sets, the unprocessed journal is stored in the inherited data set by the journal merge unit, and this inherited data set is stored. Is transferred to the takeover data set of the second data processing system at the time of transition of the transaction processing, and after the second data processing system is started, the journal merge unit of the second data processing system The first data processing of the person who has not output the processing journal The journal output by the data processing device of the second data processing system that inherits the transaction processing of the system data processing device and the unprocessed journal transferred to the inherited data set are input and merged, and the unprocessed journal And the journal output by the data processing device of the second data processing system that has taken over the transaction processing of the data processing device of the first data processing system that has not output the unprocessed journal. , Merging by inputting the journal output by the data processing device of the second data processing system that is taking over the transaction processing of the data processing device of the first data processing system that outputs the unprocessed journal A method for taking over a journal merge, which is characterized by: 3. The journal merge takeover method according to claim 2, wherein an unprocessed journal data set is provided in each of the first data processing system and the second data processing system, and the unprocessed journal is used as the inherited data set. In place of the above, the journal merge takeover method is characterized by storing in the unprocessed journal data set. 4. The journal merge takeover method according to claim 2, wherein the first data processing system and the second data processing system are provided with unprocessed journal data sets corresponding to the respective data processing devices. A journal merge takeover method, wherein an unprocessed journal related to a data processing device is replaced with the taken over data set and stored in an unprocessed journal data set corresponding to each data processing device. 5. A journal is read and merged from each journal data set corresponding to each data processing device that stores a journal output by two data processing devices of the migration source data processing system, and the merge result is merged into a merge journal data set. A function to store, an unprocessed journal that is not merged because there is no journal to be merged due to the stop of one data processing device, and a function to store the unprocessed journal stored in the inherited data set to the destination data processing A program that causes a computer to perform the function of transferring to the system. 6. The journal is read from each journal data set corresponding to each data processing device storing the journals output by the two data processing devices of the migration destination data processing system, and merged, and the merged result is merged into a merge journal data set. Storage function, unprocessed journal in the migration source data processing system transferred from the migration source data processing system and stored in the takeover data set, and the migration source data processing that does not output the unprocessed journal A program for causing a computer to realize a function of reading and merging a journal output by the data processing device of the migration destination data processing system that inherits the processing of the system data processing device and storing the merged result in a merge journal data set. .