Bug #33650 mysql_alter_table() unnecessarily does full table copy
Submitted: 3 Jan 2008 12:38 Modified: 10 May 2011 13:53
Reporter: Marko Mäkelä Email Updates:
Status: Closed Impact on me:
None 
Category:MySQL Server: DDL Severity:S5 (Performance)
Version:5.1.23-bk, 5.5.7 OS:Any
Assigned to: CPU Architecture:Any
Triage: Triaged: D3 (Medium) / R3 (Medium) / E3 (Medium)

File: Maximum allowed size is 3MB.
Description:
Privacy:

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-33650.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:

  1. Open an SFTP client and connect to sftp.oracle.com. Specify port 2021 and remote directory /support/incoming/.
  2. Log in with your newly created Oracle Web account (email address) and password.
  3. Upload the archive to /support/incoming.
  4. Once you have uploaded the file, add a comment to this bug to notify us about it.
Example: 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.

[25 Feb 2008 10:36] Vasil Dimov
Patch that fixes this bug by calling create_length_to_internal_length() just before the is_equal() check

Attachment: bug33650.diff (application/octet-stream, text), 420 bytes.