Re: MySQL 5.5.33 History list not purging?
So I've done some more digging on this. 1. Upgraded to MySQL 5.5.37 2. Made sure we didn't have any old/long running transactions--nothing more than a few seconds. 3. Did a dump/reload in to a new DB and started with an empty history list. A few days later, we're back up over 3mil in the list. We're currently writing about 50MB/s to that machine. Is it possible the purge thread just...can't keep up for some reason? How can I get better visibility in to how quickly the purge thread is working vs. how many undo entries are being put in the thread? Thanks, *Brad Heller *| Director of Engineering | Cloudability.com | 541-231-1514 | Skype: brad.heller | @bradhe http://www.twitter.com/bradhe | @cloudability http://www.twitter.com/cloudability We're hiring! https://cloudability.com/jobs http://www.cloudability.com/jobs On Sun, Sep 7, 2014 at 2:04 AM, Jesper Wisborg Krogh my...@wisborg.dk wrote: Hi Brad, -Original Message- From: Brad Heller [mailto:b...@cloudability.com] Sent: Sunday, 7 September 2014 03:07 To: MySQL General List Subject: MySQL 5.5.33 History list not purging? For some reason, the history list isn't purging on one of my masters. This is causing all kinds of weird issues/behavior with reads. Here's the last 8 or so hours of history list length: http://i.imgur.com/Q4DEeVi.png I would start looking for an old transaction. You can use SHOW ENGINE INNODB STATUS or the information_schema.INNODB_TRX table to look for that. Best regards, Jesper Krogh MySQL Support -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql
RE: MySQL 5.5.33 History list not purging?
Hi Brad, -Original Message- From: Brad Heller [mailto:b...@cloudability.com] Sent: Sunday, 7 September 2014 03:07 To: MySQL General List Subject: MySQL 5.5.33 History list not purging? For some reason, the history list isn't purging on one of my masters. This is causing all kinds of weird issues/behavior with reads. Here's the last 8 or so hours of history list length: http://i.imgur.com/Q4DEeVi.png I would start looking for an old transaction. You can use SHOW ENGINE INNODB STATUS or the information_schema.INNODB_TRX table to look for that. Best regards, Jesper Krogh MySQL Support -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql
Re: MySQL 5.5.33 History list not purging?
Am 06.09.2014 um 19:07 schrieb Brad Heller: For some reason, the history list isn't purging on one of my masters. This is causing all kinds of weird issues/behavior with reads so why do you not just try to update first? 5.5.39 is recent and contains *a lot* of bufixes look at the changelogs - there are tons of replication related bugixes with each minor update signature.asc Description: OpenPGP digital signature
Re: MySQL 5.5.33 History list not purging?
Good point. We'll try that out. I noticed our ibdata file is gigantic now, likely due to the alter table migration we ran. What's the relationship here, do you think? *Brad Heller *| Director of Engineering | Cloudability.com | 541-231-1514 | Skype: brad.heller | @bradhe http://www.twitter.com/bradhe | @cloudability http://www.twitter.com/cloudability We're hiring! https://cloudability.com/jobs http://www.cloudability.com/jobs On Sat, Sep 6, 2014 at 10:12 AM, Reindl Harald h.rei...@thelounge.net wrote: Am 06.09.2014 um 19:07 schrieb Brad Heller: For some reason, the history list isn't purging on one of my masters. This is causing all kinds of weird issues/behavior with reads so why do you not just try to update first? 5.5.39 is recent and contains *a lot* of bufixes look at the changelogs - there are tons of replication related bugixes with each minor update
