… HISTORY table). This is the lock for each index tree. We may be able to disperse the lock using by the partitioning of… SEMAPHORES section again, “has waited at handler/ha_innodb.cc line 7275 for 0.0000 seconds the semaphore: X-lock on RW-latch at… the line which appears for the most times (it is dict_operation_lock). It may be partition specific lock contention. The current XtraDB…
Post: Scaling problems still exist in MySQL 5.5 and Percona Server 5.5
May 20, 2011 By 11 Comments
…_aio_wait,io_handler_thread,start_thread,clone 5 pthread_cond_wait,os_cond_wait,os_event_wait_low,sync_array_wait_event,rw_lock_s_lock_spin,pfs_rw_lock…_sel_get_clust_rec_for_mysql,row_search_for_mysql,ha_innobase::index_read,handler::read_ra nge_first,handler::read_multi_range_next…
Post: Helgrinding MySQL with InnoDB for Synchronisation Errors, Fun and Profit
November 24, 2011 By 2 Comments
… we are talking about. For a proper implementation for our purposes, Patrick has added… by 0x6B34515: fil_aio_wait (fil0fil.c:4512) ==9090== by 0x6BC58E0: io_handler_thread (srv0start.c:…lock order violation, thus a potential deadlock. The locks in question are LOCK_global_system_variables and LOCK…
Post: Write contentions on the query cache
September 5, 2012 By 5 Comments
… EXPLAIN, SHOW PROFILE, SHOW STATUS LIKE ‘Handler%’. EXPLAIN and Handler counters only confirmed that the …Waiting for query cache lock | 0.000004 | | Waiting on query cache mutex | 0.000002 | | Sending data | 0.003407 | | Waiting for query cache lock | 0.000003 | | Waiting…
Post: Falcon Storage Engine Design Review
January 12, 2007 By 19 Comments
… certainly can be applied for MyISAM and Innodb. I remember there were plans to implement such handler interface but I’m not… Optimistic locking concurrency which can give you problems if you have lock intensive workload so many update queries have to wait for row level locks. With Falcon at this point situation is rather funny, it will still wait for other transaction which…
Post: Ultimate MySQL variable and status reference list
January 8, 2011 By 4 Comments
…lock_wait_timeoutblogpercona.commanual innodb_locks_unsafe_for…
Comment: MySQL Server Memory Usage
September 1, 2006 By 21 Comments
…to handle for …Handler_commit’, ’19092941′ ‘Handler_delete’, ’0′ ‘Handler_discover’, ’0′ ‘Handler_read_first’, ’1100773′ ‘Handler_read_key’, ’2491307870′ ‘Handler_read_next’, ’1266206297′ ‘Handler_read_prev’, ’0′ ‘Handler…’, ’935242′ ‘Table_locks_immediate’, ’895966639′ ‘Table_locks_waited‘, ’20096′ ‘…
Post: Worse than DDOS
August 18, 2008 By 5 Comments
…” handler I already wrote about this topic, but when troubleshooting this all takes another angle. Default file handler means file gets locked while… would be either waiting on locks or owning the lock and so one of them is the process we’re looking for. Things are… – this does not cause any locks for parallel session use so only the process which actually stalls waiting on external resource will show…
Comment: How much memory can MySQL use in the worst case?
February 19, 2009 By 17 Comments
… a web that Realestate agents use to advertise properties for sale and/or rent. We are currently using …_reads 12 Handler_read_rnd 2,448 k(this increases steady as the server runs) Handler_read_rnd_…_merge_passes 2,602 Opened_tables 1,500 Table_locks_waited 74 hope this is enough information to help …
