…Cache” which is quite helpful for MySQL Performance optimization tasks but there…- Meaning it does not work for subselects, inline views, parts of the … invalidated from query cache by table updates, this means number of queries…First looking at number of your selects – Com_select and see how many …
Post: MySQL EXPLAIN limits and errors.
July 24, 2006 By 6 Comments
… SELECT with appropriate where clause. This however would not tell you full story, especially now as MySQL has triggers which can make updates… important one is if Derived tables (selects in FROM clause) are used. MySQL will execute these subselects on explain to provide plan for…
Post: Air traffic queries in InfiniDB: early alpha
November 2, 2009 By 19 Comments
…_time: NULL Update_time: NULL…mysql> show warnings; +——-+——+————————————————————+ | Level | Code | Message | +——-+——+————————————————————+ | Error | 9999 | Subselect…Query Q1: mysql> SELECT DayOfWeek, …
Comment: Database problems in MySQL/PHP Applications
August 11, 2006 By 13 Comments
…background. > Things are different with MySQL. Good design will help … add processing time to inserts, updates, and deletes but there are other… This most applies to subqueries Where Subselects with IN() become > corellated even … > instead of: > SELECT * FROM articles WHERE user_id IN (SELECT id FROM …
