MIGRATING DATA IN TABLES IN A DATABASE

• US 20150112923A1
• Filed: 10/21/2013
• Published: 04/23/2015
• Est. Priority Date: 10/21/2013
• Status: Active Grant

• Current Assignee: SAP SE
• Original Assignee: SAP SE
• Inventors: Driesen, Volker, Haferkorn, Andre, Jordt, Nicolai, Specht, Juergen, Meissner, Steffen, Biewald, Lars-Eric
• Granted Patent: US 9,436,724 B2
• Time in Patent Office: Days
• US Class Current: 707/609
• CPC Class Codes: G06F 16/2379 Updates performed during online database operations; commit processing

Abstract

Techniques for migrating data in a database include identifying an update to one or more data entries of a source table; determining that a status of a trigger associated with the source table indicates to update a logging table, and in response: updating, in a first transaction, (i) the one or more data entries of the source table, and (ii) one or more data entries of the logging table based on the user input, and copying content of the source table to a target table; and determining that the status indicates to update the target table, and in response: updating, in a second transaction, (i) the one or more data entries of the source table and (ii) one or more data entries of the target table based on the user input, and updating the content of the target table based on the one or more data entries of the logging table.

Claims

1. A computer-implemented method for migrating data in a database, comprising:

identifying an update to one or more data entries of a source table;

determining that a status of a trigger associated with the source table indicates to update a logging table, and in response;

updating, in a first transaction, (i) the one or more data entries of the source table, and (ii) one or more data entries of the logging table based on the user input, and

copying content of the source table to a target table; and

determining that the status of the trigger associated with the source table indicates to update the target table, and in response;

updating, in a second transaction, (i) the one or more data entries of the source table and (ii) one or more data entries of the target table based on the user input, and

updating the content of the target table based on the one or more data entries of the logging table.

2. The computer-implemented method of claim 1, wherein identifying the update further comprises receiving a user input that comprises the update, the update comprising an insertion, deletion, or update to the one or more data entries of the source table.

3. The computer-implemented method of claim 1, wherein copying the content of the source table to the target table further comprises:

segmenting the content of the source table into one or more segments; and

copying each segment of the content from the source table to the target table.

4. The computer-implemented method of claim 3, wherein copying each segment of the content from the source table to the target table further comprises:

locking the segment of content currently being copied from the source table to the target table; and

restricting modification of the content associated with the segment of content of the source table based on the locking.

5. The computer-implemented method of claim 4, wherein locking the respective segment of content currently being copied from the source table to the target table further comprises locking one or more table rows of content associated with the segment of the source table content.

6. The computer-implemented method of claim 1, wherein copying content of the source table to the target table further comprises:

excluding the one or more data entries of the source table that were updated in the first transaction from being copied to the target table.

7. The computer-implemented method of claim 1, wherein the source table is associated with a first structure, the method further comprising:

creating the target table, the target table associated with a second structure differing from the first structure; and

associating the second structure with the content of the source table to be copied to the target table.

8. The computer-implemented method of claim 1, further comprising:

identifying a first table name associated with the source table;

replacing the first table name associated with the source table with a second table name; and

associating the first table name with the target table.

9. A computer program product encoded on a non-transitory storage medium, the product comprising non-transitory, computer readable instructions for causing one or more processors to perform operations comprising:

identifying an update to one or more data entries of a source table;

determining that a status of a trigger associated with the source table indicates to update a logging table, and in response;

updating, in a first transaction, (i) the one or more data entries of the source table, and (ii) one or more data entries of the logging table based on the user input, and

copying content of the source table to a target table; and

determining that the status of the trigger associated with the source table indicates to update the target table, and in response;

updating, in a second transaction, (i) the one or more data entries of the source table and (ii) one or more data entries of the target table based on the user input, and

updating the content of the target table based on the one or more data entries of the logging table.

10. The computer storage medium of claim 9, wherein copying the content of the source table to the target table further comprises:

segmenting the content of the source table into one or more segments; and

copying each segment of the content from the source table to the target table.

11. The computer storage medium of claim 10, wherein copying each segment of the content from the source table to the target table further comprises:

locking the segment of content currently being copied from the source table to the target table; and

restricting modification of the content associated with the segment of content of the source table based on the locking.

12. The computer storage medium of claim 11, wherein locking the respective segment of content currently being copied from the source table to the target table further comprises locking one or more table rows of content associated with the segment of the source table content.

13. The computer storage medium of claim 9, wherein copying content of the source table to the target table further comprises:

excluding the one or more data entries of the source table that were updated in the first transaction from being copied to the target table.

14. The computer storage medium of claim 9, wherein the source table is associated with a first structure, the method further comprising:

creating the target table, the target table associated with a second structure differing from the first structure; and

associating the second structure with the content of the source table to be copied to the target table.

15. The computer storage medium of claim 9, the operations further comprising:

identifying a first table name associated with the source table;

replacing the first table name associated with the source table with a second table name; and

associating the first table name with the target table.

16. A system of one or more computers configured to perform operations comprising:

identifying an update to one or more data entries of a source table;

determining that a status of a trigger associated with the source table indicates to update a logging table, and in response;

updating, in a first transaction, (i) the one or more data entries of the source table, and (ii) one or more data entries of the logging table based on the user input, and

copying content of the source table to a target table; and

determining that the status of the trigger associated with the source table indicates to update the target table, and in response;

updating, in a second transaction, (i) the one or more data entries of the source table and (ii) one or more data entries of the target table based on the user input, and

updating the content of the target table based on the one or more data entries of the logging table.

17. The system of claim 16, wherein copying the content of the source table to the target table further comprises:

segmenting the content of the source table into one or more segments; and

copying each segment of the content from the source table to the target table.

18. The system of claim 17, wherein copying each segment of the content from the source table to the target table further comprises:

locking the segment of content currently being copied from the source table to the target table; and

restricting modification of the content associated with the segment of content of the source table based on the locking.

19. The system of claim 18, wherein locking the respective segment of content currently being copied from the source table to the target table further comprises locking one or more table rows of content associated with the segment of the source table content.

20. The system of claim 16, the operations further comprising:

identifying a first table name associated with the source table;

replacing the first table name associated with the source table with a second table name;

associating the first table name with the target table.