| Bug #46648 | SQL_CALC_FOUND_ROWS kills performance with ORDER BY and LIMIT | ||
|---|---|---|---|
| Submitted: | 11 Aug 2009 11:41 | Modified: | 17 Aug 2009 13:36 |
| Reporter: | Jille Timmermans | Email Updates: | |
| Status: | Verified | Impact on me: | |
| Category: | MySQL Server: Optimizer | Severity: | S3 (Non-critical) |
| Version: | 5.1.32, 4.1, 5.0, 5.1, azalea bzr | OS: | Linux (2.6.28.7) |
| Assigned to: | CPU Architecture: | Any | |
| Tags: | limit, order by, performance, sql_calc_found_rows | ||
If the data you need to attach is more than 3MB, you should create
a compressed archive of the data and a README file that describes the data
with a filename that includes the bug number (recommended filename:
mysql-bug-data-46648.zip) and upload one to sftp.oracle.com.
A free Oracle Web (SSO) account (the one you use to login bugs.mysql.com)
and a client that supports SFTP are required in order to access the SFTP server.
To upload the file to sftp.oracle.com:
- Open an SFTP client and connect to
sftp.oracle.com. Specify port2021and remote directory/support/incoming/. - Log in with your newly created Oracle Web account (email address) and password.
- Upload the archive to
/support/incoming. - Once you have uploaded the file, add a comment to this bug to notify us about it.
sftp -oPort=2021 -oUser=email sftp.oracle.com:/support/incoming
Usage Notes: This directory is unlistable, which means that once you have uploaded your file, you will not be able to see it. A file cannot be uploaded more than once with the same filename. The filename must be changed before attempting to upload the file again. The filename should always start with mysql-bug- prefix. Files are retained on the SFTP server for 7 days and then permanently removed.
