Mysql replication invalidating query cache entries Free webcam sex on iphone 5
If your query cache is large, your SELECT queries may be noticeably slowed waiting on a response from the query cache while it’s busy removing invalidated queries by some other thread.
Data tracking within auto cache invalidation keeps the user profile query cache up to date and significantly offloads the database from processing repetitive queries.e Commerce sites where users can buy and sell items in an auction require the auction price and associated data such as current bidders to be fetched and updated frequently.I had hoped for the opposite, and this seems like buggy behavior... I can't stop and start the replication at all without breaking the replication.If I do "stop slave" and then "start slave" again it immediately has an error like this, seemingly for random tables that have been written to (not one in particular): Could not execute Write_rows event on table XXX; Duplicate entry 'YYY' for key 'ZZZ', Error_code: 1062; handler error HA_ERR_FOUND_DUPP_KEY; the event's master log binlog.000003, end_log_pos 704849 I have scoured the bug reports and found nothing to explain either of these. I'm running the Linux (AMD64 / Intel EM64T) build of 5.1.25 on a xeon box...nothing that unusual about my environment or database. If nobody has ideas I suppose I will file bug reports, but these are such general failures I don't know what to say in them other than "it don't work".In theory, the cache exists to speed up your application by responding to the same query with results directly from memory instead of parsing, optimizing, and re-executing the query against the database.
However, the query cache is only useful in certain scenarios.
If that describes the average usage for your database, you may see a small performance boost by disabling the query cache altogether.