…SQL can produce an infinite variety of queries. The query optimizer analyzes queries for common patterns the MySQL designers know can… storing another column, and reinitializing the sequence after making certain insert/update/delete operations. If you have a dataset that changes infrequently, then…
Post: Tuning InnoDB Concurrency Tickets
May 24, 2010 By 5 Comments
… of rows inserted – 1 SELECT: 1 ticket per row returned UPDATE: 1 ticket per row examined + 1 ticket per row updated DELETE: 1 ticket per row examined + 1 ticket per row deleted ALTER: (2 * rows in the table) – 1 As with any performance optimization…
Comment: How to find wrong indexing with glance view
March 8, 2010 By 27 Comments
… a reasonable choice in 1965 for a production database involving inserts, updates and deletes but not so much in 2010. MySQL surprisingly supports… detrimental. Not only do these indexes slow down insert operations, the MySQL optimizer sometimes appears to become rather overwhelmed by the number…
Post: MySQL Query Cache
July 27, 2006 By 70 Comments
… called “Query Cache” which is quite helpful for MySQL Performance optimization tasks but there are number of things you need to…_hits/Qcache_inserts Other portion of overhead comes from modification statements which you can calculate by (Com_insert+Com_delete+Com_update+Com_replace…
Post: Percona Server 5.1.59-13.0
October 16, 2011 By Leave a Comment
…make it faster. By reading the rows for “INSERT“, “UPDATE“ and “DELETE“ statements but not updating them (Fake Changes), the rollback is very fast…unnecessarily delays their creation in a mysqldump output, so –innodb-optimize-keys should ignore foreign key constrains. #859078 (Alexey Kopytov). …
Post: Percona Server 5.5.16-22.0
October 16, 2011 By 2 Comments
…make it faster. By reading the rows for “INSERT“, “UPDATE“ and “DELETE“ statements but not updating them (Fake Changes), the rollback is very …unnecessarily delays their creation in a mysqldump output, so –innodb-optimize-keys should ignore foreign key constrains. #859078 (Alexey Kopytov). …
Comment: Database problems in MySQL/PHP Applications
August 11, 2006 By 13 Comments
… important benefits – your data > becomes managable, your ALTER TABLE or OPTIMIZE TABLE > now locks small table for few seconds rather than… create indexes. Foreign key references may add processing time to inserts, updates, and deletes but there are other benefits. Also – if you’re…
Post: MySQL Partitioning - can save you or kill you
December 11, 2010 By 45 Comments
…to write about using MySQL Partitioning for Performance Optimization and I just got a relevant customer …can be a lot slower. The gain from updates typically comes from having smaller BTREE on …values and when number of deletes by “id” and bunch of inserts. The deletes are mainly clustered around most…
Comment: How fast can MySQL Process Data
April 11, 2008 By 3 Comments
… understand… Which in return means that if you have multiple deletes/inserts/updates going on on your table you are never sure if… table rather then looking at some index (if that is optimized). I am also wondering why you didn’t use an…
Post: Ultimate MySQL variable and status reference list
January 8, 2011 By 4 Comments
….commanual Com_delete_multiblogpercona.commanual …insert_limitblogpercona.commanual Delayed_insert_threadsblogpercona.commanual delayed_insert…optimizer_prune_levelblogpercona.commanual optimizer_search_depthblogpercona.commanual optimizer…unique_checksblogpercona.commanual updatable_views_with_…
