… release of MySQL 5.6, and I wanted to check if any improvement has been made to the slow query log in table format. Users of some MySQL appliances like Amazon RDS must use table…)/1000000.0); However, just like in prior releases of MySQL, when writing slow query information to the log table, query times and lock times are…
Post: MySQL Slow query log in the table
May 31, 2007 By 1 Comment
As of MySQL 5.1 get MySQL slow query log logged in mysql.slow_log table instead of the file as you had in previous versions. We rarely… table implementation in MySQL is well though of in regards to avoiding trouble. For example you can’t ALTER log table while query is… this would allow to aggregate log entirely in SQL finding most frequent slow query types or queries which load server the most. The other…
Post: A (prototype) lower impact slow query log
September 20, 2012 By 12 Comments
…the information in the slow query log. The code for my prototype can be found at lp:~stewart/percona-server/5.6-slow-query-… straight MySQL (no slow query log): 13 seconds MySQL with slow query log enabled: 18 seconds My audit plugin slow query log: 15 seconds straight Drizzle (no slow query log…
Post: Identifying the load with the help of pt-query-digest and Percona Server
December 29, 2011 By 3 Comments
… data points you need to attack the right query in the right way. But vanilla MySQL does have its limitations, it reports only… in the overview section. So say if you were using the vanilla MySQL server, you would see an entry like this in the slow query log: # Time: 111229 3:02:26 # User@Host: msandbox[msandbox] @ localhost [] # Query…
Post: Hidden columns of query_review_history table
August 28, 2012 By Leave a Comment
…can use pt-query-digest to process a MySQL slow query log and store historical values for review trend analysis into query_review_history table…you copied slow query log from the another server. Having hostname set might be useful for filtering queries in the database aggregating slow queries from …
Post: Ultimate MySQL variable and status reference list
January 8, 2011 By 4 Comments
…MySQL…Slow_launch_threadsblogpercona.commanual slow_launch_timeblogpercona.commanual Slow_queriesblogpercona.commanual slow_query_logblogpercona.commanual slow_query…
Post: Does Slow query log logs all slow queries ?
June 25, 2007 By 3 Comments
… may use MySQL Slow query log to log all slow queries to catch problematic queries or for audit purposes. In fact however not all the queries are logged. I already mentioned mysql slave queries are…
Post: Visualization tools for pt-query-digest tables
August 31, 2012 By 6 Comments
When you process MySQL slow query logs using pt-query-digest you can store samples of each query into query_review table and historical values for… data from the MySQL Slow Query Log. The name comes from the instrument in a weather station that measures wind speed. SQL queries are like…
Post: Profiling MySQL stored routines
January 19, 2009 By 4 Comments
… was – I’ll just analyze queries in the slow query log generated by our mysql build running with long_query_time=0, get the slowest ones…”. Let’s call it and see what shows up in the slow query log: mysql> SELECT whatstheweatherlike(5); +———————————————————-+ | whatstheweatherlike(5) | +———————————————————-+ | Its 5°C, time…
Post: Poor man's query logging
November 7, 2008 By 5 Comments
… –log (or –general-log in MySQL 5.1+) start-up parameter. The log writes any query being executed by MySQL to a file with limited amount of additional information. The other is slow log enabled by –log-slow-queries parameter (MySQL 5.1 requires also –slow-query-log), which was designed to store poorly performing queries that…
