Tunable buffer size for fast index creation in InnoDB
We should look into making the buffer size used for InnoDB fast index creation tunable. It is currently calculated based on the merge block size (which is hardcoded to 1 MB) and the minimum index record size (see row0merge.c for details). In other words, it is allocated to process 1 MB worth of index records.
Blueprint information
- Status:
- Complete
- Approver:
- Alexey Kopytov
- Priority:
- Medium
- Drafter:
- Alexey Kopytov
- Direction:
- Approved
- Assignee:
- Alexey Kopytov
- Definition:
- Approved
- Series goal:
- Accepted for 5.5
- Implementation:
-
Implemented
- Milestone target:
-
5.5.27-28.0
- Started by
- Alexey Kopytov
- Completed by
- Stewart Smith
Related branches
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Port the innodb_
This diff makes the block size that is used in the merge sort dynamic
by adding the session variable innodb_
value for this variable is 1M, and the max is 1G. By varying the
values of this variable dbas can let the mysql server use larger
blocks during secondary index creation. The default is 1048576 which
is 1MB.
