UPDATE statements are in “query end state”

Question

We recently upgraded mysql database which is running on mysql server version 5.5.8. After the upgrade sometimes we are seeing the simple upgrade staements taking more than 1

Answer 1

Suggestions:

1) Check the size of your log files

LINK: Lots of "Query End" states in MySQL, all connections used in a matter of minutes

2) Make sure "id" has an index

3) Look at various MySql tuning and configuration options. For example: innodb_flush_log_at_trx_commit = 0

LINK: "query end" step very long at random times

WARNING: consider carefully before disabling log flushing. Look here for more details:

LINK: https://dba.stackexchange.com/questions/12611/is-it-safe-to-use-innodb-flush-log-at-trx-commit-2

Answer 2

Try adding quotes to any value you use in the query as they were all strings. That helped me many times. For example:

UPDATE Accounts SET IPadd = 'xx.xx.xx.xx' WHERE Id='xx';

Answer 3

I've checked some solutions here and I came up to this link.

Add this line (if it exists edit it):

innodb_flush_log_at_trx_commit = 0

in the /etc/my.cnf

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However

On Pedro Werneck comment:

Setting innodb_flush_log_at_trx_commit naively can be dangerous

It's your choice if you're doing transactional queries to it.