Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Bug #23046302 COUNT(*) MUCH SLOWER ON 5.7 THAN 5.6
ANALYSIS This is regression caused due to worklog 6742 which implemented ha_innobase::records() which always uses clustered index to get the row count. Previously optimizer chose secondary index which was smaller in size of clustered index to scan for rows and resulted in a quicker scan. FIX After discussion it was decided to remove this feature in 5.7. [#rb14040 Approved by Kevin and Oystein ]
- Loading branch information
Showing
7 changed files
with
6 additions
and
169 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters