Replication Checksumming Through Encryption

Problem A problem we occasionally see is Relay Log corruption, which is most frequently caused by network errors. At this point in time, the replication IO thread does not perform checksumming on incoming data (currently scheduled for MySQL 6.x). In the mean time, we have a relatively easy workaround: encrypt the replication connection. Because of […]

Case Insensitive REPLACE() for MySQL

One request I occasionally see is for a case insensitive version of REPLACE() for MySQL. I wrote this a while back, but here it is now for all of you to play around with. It uses a basic na├»ve string search algorithm, so can be slow under some circumstances. [code lang=”sql”]DELIMITER $$ DROP FUNCTION IF […]

Replication with InnoDB and MyISAM Transactions

There’s a change of behaviour in MySQL 5.1.31 for Row Based Replication, if you have InnoDB transactions that also write to a MyISAM (or other non-transactional engine) table. It’s a side effect of fixing Bug #40116. Take this simple example:

After this, the Master innodb_tbl would look like this: item val 1 1 2 […]