…. Caching full queries only – Meaning it does not work for subselects, inline views, parts of the UNION. This is also common… may see different states of the database, depending on the updates they have performed and even depending on snapshot they are… – Queries are constantly being invalidated from query cache by table updates, this means number of queries in cache and memory used…
Post: Air traffic queries in InfiniDB: early alpha
November 2, 2009 By 19 Comments
…_increment: NULL Create_time: NULL Update_time: NULL Check_time: NULL…; +——-+——+————————————————————+ | Level | Code | Message | +——-+——+————————————————————+ | Error | 9999 | Subselect in From clause …
Post: MySQL and PostgreSQL SpecJAppServer benchmark results
July 25, 2007 By 13 Comments
… my expectations would be getting at least 800 JOPS on updated software and hardware configuration, so I would argue MySQL is… slower at connection creation and MySQL is very fast, while SubSelect optimization is very bad in MySQL for many cases until…
Comment: Database problems in MySQL/PHP Applications
August 11, 2006 By 12 Comments
… indexes. Foreign key references may add processing time to inserts, updates, and deletes but there are other benefits. Also – if you… queries in this case. > This most applies to subqueries Where Subselects with IN() become > corellated even if they are not, and…
Post: MySQL EXPLAIN limits and errors.
July 24, 2006 By 6 Comments
… story, especially now as MySQL has triggers which can make updates very different. Also there is no way to tell you… (selects in FROM clause) are used. MySQL will execute these subselects on explain to provide plan for top most statement, so…
