…MySQL has implemented priority connection scheduling for the Thread Pool. (Alexey Kopytov) Percona Server for MySQL… in the read_view_create_low() in most cases. This significantly …MySQL 5.5.30-30.2 are available in our online documentation. Bugs can be reported on the launchpad bug tracker. UPDATE…
Post: Percona Server 5.5.30-30.2 rerelease fixes non-restart issue
April 24, 2013 By Leave a Comment
…was completed regardless of its state before updating. This caused some problems for some users… MySQL has implemented priority connection scheduling for the Thread Pool. (Alexey Kopytov) Percona Server for MySQL …malloc call in the read_view_create_low() in most cases. This significantly improves …
Post: Ultimate MySQL variable and status reference list
January 8, 2011 By 4 Comments
…the amazing MySQL manual, especially the option and variable ….commanual long_query_timeblogpercona.commanual low_priority_updatesblogpercona.commanual lower_case_file_…_isolationblogpercona.commanual unique_checksblogpercona.commanual updatable_views_with_limitblogpercona.commanual Uptimeblogpercona….
Post: Using MyISAM in production
June 17, 2006 By 36 Comments
… priorities. By default MySQL treats updates as higher priority operations. You can use SELECT HIGH_PRIORITY or UPDATE LOW_PRIORITY to adjust that or you can simply set low_priority_updates option. Anyway default behavior means any UPDATE statement which…
Post: SELECT LOCK IN SHARE MODE and FOR UPDATE
August 6, 2006 By 51 Comments
… comparing locking hints in MySQL and SQL Server. In MySQL/Innodb LOCK IN SHARE MODE and SELECT FOR UPDATE are more than hints…; – A lot of shared locks on Innodb table but no updates. Supporting MySQL hints “HIGH_PRIORITY” and “LOW_PRIORITY” would probably be good start.
Post: MySQL Server Variables - SQL layer or Storage Engine specific.
June 8, 2006 By 14 Comments
… disk tables and HEAP for in memory tables. So first MySQL versions did not bother naming variables with storage engines prefix… also could use this feature. low_priority_updates If enabled selects will get higher priority than updates and waiting update will not stall all new selects…
Post: MySQL Upgrade Webinar Questions Followup
June 28, 2012 By 7 Comments
… the problem. Innodb internal format is rather low level and it rarely impacts application functionality … get to former execution plan either by updating statistics (ANALYZE TABLE) or disabling some of … upgrade from MySQL 5.5 to Percona Server 5.5 Compatibility is our highest priority with Percona…
Post: Knowing what pt-online-schema-change will do
November 1, 2012 By 1 Comment
… CREATE TRIGGER `pt_osc_test_t_upd` AFTER UPDATE ON `test`.`t` FOR EACH ROW REPLACE INTO … rows because this is a dry run. INSERT LOW_PRIORITY IGNORE INTO `test`.`_t_new` (`id`, `guest_language`, …any bugs in the tool, problems with the MySQL server (privileges, etc.), or other oddities, there is…
Comment: Why MySQL could be slow with large tables ?
June 20, 2007 By 141 Comments
…=1500 log_slow_queries=/var/log/mysql-slow.log sql-mode=TRADITIONAL concurrent_insert=2 low_priority_updates=1 The problem was that at… record as mentioned above (a small fraction of INSERTs and UPDATEs)? We explored a bunch of issues including questioning our hardware… over 30 tables and we needed referential integrity and such, MySQL was a pathetic “option”. Yes 5.x has included triggers…
Comment: Percona build7 with latest patches
November 20, 2008 By 26 Comments
… or more optimal my.conf file should looks for persona MySQL to keep let’s say 256 aggressive users in read…) mode? my current conf: (for MySQL 32bit) [mysqld] max_connections=2000 key_buffer_size=200M low_priority_updates=1 table_cache = 8000 sort_buffer…
