… events ? If you can’t get fancy graph quickly you can … better as you can query temporary tables too: mysql> select sum(data_length…+ 2623331) File system 294352 (82672 + 211680) Lock system 318875832 (318747272 + 128560) Recovery system 0 … leaks like valgrind are too slow to run in production. So …
Post: Identifying the load with the help of pt-query-digest and Percona Server
December 29, 2011 By 3 Comments
… get started. Before We Start! But before we start, make sure you have enabled slow query logging…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_time: 2.365434 Lock_…
Post: Slow Query Log analyzes tools
September 6, 2006 By 83 Comments
…slow query log starts to look like this: # User@Host: root[root] @ localhost [] # Query_time: 0.000652 Lock…queries slow query log may be growing too rapidly to follow, so we implemented slow query log filter (based on parse_mysql_slow…
Post: MySQL Slow query log in the table
May 31, 2007 By Leave a 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 … and lock time does not store fractions of the second. Today I’ve got some time to play with table based slow query… to aggregate log entirely in SQL finding most frequent slow query types or queries which load server the most. The other handly feature…
Post: ACTIVE with Locks – Now thats a problem !
June 2, 2011 By 2 Comments
… long enough ACTIVE transactions which have some locks, like in this case: MySQL thread id 2059, query id 1014425 10.10.10.10… id 1224980800 3 lock struct(s), heap size 368, 1 row lock(s), undo log entries 1 MySQL thread id 1720, query id 1011283… corresponding to this old transaction and so you can get system to slow down because of maintaining many old row versions. I…
Post: What do we optimize with mk-query-digest ?
December 15, 2009 By 2 Comments
…query itself – general system overload, row level locks, table locks all could cause query response time to be unreasonable. If Slowest query is not interactive query…perfectly possible to get bad performance with MySQL responsible for large portion of response time without any slow queries. We’ve …
Post: Scaling problems still exist in MySQL 5.5 and Percona Server 5.5
May 20, 2011 By 11 Comments
… query log with mk-query-digest. When I filtered out only queries…lock_s_lock_spin,pfs_rw_lock_s_lock_fu nc,btr_search_build_page_hash_index,btr_search_info_update_slow…get_next,rr_quick,sub_select,do_select,JOIN::exec,mysql_sel ect,handle_select,execute_sqlcom_select,mysql_execute_command,mysql…
Post: How Percona does a MySQL Performance Audit
November 24, 2008 By 17 Comments
…mysql –user=mysql –pid-file=/var/run/mysqld/mysqld.pid –skip-external-locking –port=3306 –socket=/var/db/mysql/mysql…expensive queries, in total execution time. By the way, the slow query logs in the stock MySQL server…how much total gain I can get from it. Queries are not just “bad” or “good” –…
Post: Managing Slave Lag with MySQL Replication
October 12, 2007 By 11 Comments
…queries being replicated. Unfortunately MySQL Slow Query Log does not log replication queries. Though this is one of few slow query logging improvements you can get with our Slow Query…
Post: Modeling MySQL Capacity by Measuring Resource Consumptions
March 8, 2011 By 1 Comment
…get CPU consumption per query ? You can take a look at procfs for MySQL process: root@ubuntu:/var/log/mysql…query logging and log_slow_verbosity=full you can also get great amount of related data from mk-query…======= ======= ======= # Exec time 8338s 1us 284s 5ms 13ms 298ms 185us # Lock time 71s 0 …
