Bug #21074 Large query_cache freezes mysql server sporadically under heavy load
Submitted: 14 Jul 2006 23:36 Modified: 12 Mar 2010 17:55
Reporter: Ananth Reddy Email Updates:
Status: Closed Impact on me:
Category:MySQL Server: Query Cache Severity:S3 (Non-critical)
Version:5.0.27, 4.1.19-standard-log OS:Linux (RedHat 4)
Assigned to: Kristofer Pettersson CPU Architecture:Any
Tags: bfsm_2007_03_01, bfsm_2007_07_19, bfsm_2007_08_16, freeze, locks, query_cache

File: Maximum allowed size is 3MB.

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-21074.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.

[28 Aug 2007 12:09] Shane Bester
testcase to show a problem every 5 minutes.  For couple of mins, 0 queries happen.

Attachment: qc01.c (text/plain), 10.22 KiB.