June 20, 2013

Post: Flexviews - part 3 - improving query performance using materialized views

query execution time. It may be possible, therefore, to refresh an MV based on a query that takes 45 minutes to execute… use this MV to display the total sales …time: mysql> call flexviews.enable( -> flexviews.get_id(‘demo’,'complete_example2′)); Query OK, 0 rows affected (42 min 42.14 sec) mysql

Post: How Percona does a MySQL Performance Audit

… the same components. Tagging, friends, queues, click tracking, search, paginated displays — we’ve seen these and dozens of other common patterns… the top 10 most expensive queries, in total execution time. By the way, the slow query logs in the stock MySQL server are extremely limited…

Post: SHOW INNODB STATUS walk through

… InnoDB 442 mysql tables in use 1, locked 0 MySQL thread id 8079, query id 728899 …buffers. Normal reads originated from query executions are executed by threads running queries. On Unix/Linux you …for execution or being executed at the same time. Also number of pending fsync operations is displayed. …

Post: InnoDB Full-text Search in MySQL 5.6 (part 1)

…—-. 1 mysql mysql 98304 Feb 20 16:09 FTS_00000000000000ad_STOPWORDS.ibd -rw-rw—-. 1 mysql mysqlquerying the various I_S.INNODB_FT_* tables. In particular, the INNODB_FT_CONFIG table is supposed to “display…more times, and each execution took between 6 and 8 seconds, but the output of the query

Post: Percona Server 5.1.49-rel12.0

time_distribution – Counts queries with very short execution times and groups them by timedisplaying an incorrect time. Bug #610525 – Reduces the number of compile time

Post: mk-query-digest, query comments and the query cache

time, cpu time, mysql query times, etc, and automatically places this information into the Apache environment. It also includes support for “augmenting” SQL queries

Post: How does MySQL Replication really work?

MySQL manual here. Put simply, the events can be one of two types: Statement based – in which case these are write queries… to display information) Exec_Master_Log_Pos – which position from master binary log is being executed … ever read from one disk at a time. That being said, one solution to fix …

Post: Announcing Percona Server for MySQL version 5.1.67-14.4

…files. Bugs Fixed: Time in slow query log was displayed incorrectly when slow_query_log_microseconds_timestamp … (Laurynas Biveinis). The server could crash when executing an INSERT or UPDATE statement containing … line option innodb_changed_pages_limit. MySQL option handling would then shadow the …

Post: Announcing Percona Server for MySQL version 5.5.29-30.0

…(Sergei Glushchenko). The server could crash when executing an INSERT or UPDATE statement containing…line option innodb_changed_pages_limit. MySQL option handling would then shadow the…1105726 (Laurynas Biveinis). Time in slow query log was displayed incorrectly when slow_query_log_timestamp_precision…

Post: Converting Character Sets

Query OK, 0 rows affected (0.02 sec) mysql> ALTER TABLE `t1` CONVERT TO CHARACTER SET utf8 COLLATE utf8_general_ci; Query… in the replication chain (very time/bandwidth/disk space consuming). Except for …would be executed without executing them. –user|u The MySQL user –version|V Display version …