… Error Messages which are confusing, here is one more: 080603 20:53:10 [Note] Slave: connected to master ‘repl@host.com:3306′,replication… Server I’m getting error log file flooded with messages like this and there is no hint in the message what would explain… it would be nice to include possible reason for this error message which MySQL already does in many other cases. I’ve…
Post: Debugging problems with row based replication
May 6, 2010 By 10 Comments
… like RAND() are used in DML statements. A statement based replication slave can get out of sync with the master fairly… rows, a replication slave which does not find a row referenced in a row-based log will immediately return an error: HA…; handler error HA_ERR_KEY_NOT_FOUND; the event’s master log mysql-bin.000001, end_log_pos 340718 This error message is…
Post: Missleading Innodb message on recovery
February 15, 2010 By 2 Comments
…. The customer came to me today having the following message in the error log after Slave crash while running MySQL 5.1… version without XtraDB or Percona Patches) InnoDB: In a MySQL replication slave the last master binlog file InnoDB: position 0 10000000… find first log file name in binary log index file” error message Looking at the Master for this slave I could see…
Post: Troubleshooting Relay Log Corruption in MySQL
August 2, 2008 By 5 Comments
… MySQL Error log file. The error message describes few reasons and indeed because there is little validation (ie no checksums) in the replication there are multiple reasons for bad event to show up in relay logs. Really this is only one of various error messages… are bad on the master you would get the same error message again and can continue with investigation. What if logs on…
Post: Statement based replication with Stored Functions, Triggers and Events
December 16, 2011 By 3 Comments
… our infrastructure. Is possible to define different Triggers in your replication servers if you need different actions for the same statements… your servers you will break your replication and the SQL process will stop with an error. Example: mysql> CREATE FUNCTION this_year… the replication will be broken. After executing a SHOW SLAVE STATUS you will see a message like the following one: Last_Error: Error ‘FUNCTION…
Post: How Does Semisynchronous MySQL Replication Work?
January 19, 2012 By 23 Comments
… not what happens in semi-synchronous replication. And if there is an error in semi-synchronous replication, such as a crash at the… to the traditional mode of replication. What does semi-synchronous replication guarantee me then? If there are no errors or timeouts, then the… not mean to sound negative, or to send the message that semi-synchronous replication is not useful. It is useful, but if…
Post: STOP: DELETE IGNORE on Tables with Foreign Keys Can Break Replication
February 2, 2012 By 1 Comment
…] {msandbox} (test) > SHOW WARNINGS \G *************************** 1. row *************************** Level: Error Code: 1451 Message: Cannot delete or update a parent row: a…deleted then those 100 events are logged and eventually replicated. [revin@forge rsandbox_5_5_170]$ ./master/use test ……
Post: MySQL Crash Recovery
July 30, 2006 By 26 Comments
… out of sync with database content. This will sometimes break replication but if you’re just planning on using binary log… internal Innodb dictionary may cause MySQL to fail with wierd error messages. In MySQL 4.1 sync_frm option was added which… more frustrating for users than getting honest “try again later” message, but also – warmup takes longer time on extreme load. Innodb…
Comment: Thoughts on MySQL Replication
October 17, 2008 By 18 Comments
… a lot of talks are done about this multi thread replication but it is far from trivial when you want it… general case. First failed queries – you can now set replication to skip errors but this is very dangerous thing to do, unless… with no error messages. Now grouping queries by tables requires dependency tracking (though it is much easier with row level replication) and it…
Comment: When should you store serialized objects in the database?
January 22, 2010 By 42 Comments
… main reasons as well. Imagine that you had some application error which caused an unindexed column to store the word broccoli…-less…”, but thank you for the two additional examples. Replication and messaging systems are both interesting in that they are so specific… justification that ‘it needs to be this way for the message system’ to convert everything over to E-Blob. That’s…
