… 0 MySQL thread id 53038, OS thread handle 0x7ff759b22700, query id 3918786 localhost root Sending data select count(*) from sbtest,sbtest x Trx read view will not see trx with id >= 12304, sees < 12301 As you can see in this…
Post: Percona XtraDB Cluster: Multi-node writing and Unexpected deadlocks
August 17, 2012 By 17 Comments
… entries 1 MySQL thread id 3972, OS thread handle 0x7fddb84e0700, query id 16408 localhost root sleeping show engine innodb status Trx read view will not see trx with id >= 83C, sees < 83C TABLE LOCK table `test`.`autoinc` trx id 83B lock mode IX RECORD LOCKS space id 0 page no…
Post: When does Innodb Start Transaction ?
January 11, 2011 By 9 Comments
…, process no 23727, OS thread id 139753656395520 MySQL thread id 112, query id 411 localhost root show innodb status Trx read view will not see trx with id >= F56AEE, sees < F56AEE If you're running in AUTOCOMMIT=0 mode the same logic will apply – setting this mode will NOT start transaction however reading…
Post: SHOW INNODB STATUS walk through
July 17, 2006 By 40 Comments
… 0 MySQL thread id 8079, query id 728899 localhost root Sending data select sql_calc_found_rows * from b limit 5 Trx read view will not see trx with id >= 0 80157601, sees… 0 MySQL thread id 8078, query id 728898 localhost root Sending data select sql_calc_found_rows * from b limit 5 Trx read view will not see trx with id >= 0 80157600, sees…
Post: ACTIVE with Locks – Now thats a problem !
June 2, 2011 By 2 Comments
… locks, like in this case: MySQL thread id 2059, query id 1014425 10.10.10.10 user Trx read view will not see trx with id >= 2 1418401228, sees < 2 1418374947 ---TRANSACTION 2 1418401057, ACTIVE 295 sec, process no 1098, OS thread id 1224980800 3…
Post: Percona XtraDB Cluster reference architecture with HaProxy
June 20, 2012 By 63 Comments
…will start using an other one. However if we connect to port 3307, we will use all the 3 nodes for reads…with data for the benchmark. # sysbench –test=oltp –db-driver=mysql –mysql-engine-trx=yes –mysql-table-engine=innodb –mysql-host=127.0.0.1 –mysql…
Post: Differences between READ-COMMITTED and REPEATABLE-READ transaction isolation levels
August 28, 2012 By 3 Comments
…read views In REPEATBLE READ, a ‘read view‘ ( trx_no does not see trx_id >= ABC, sees < ABB ) is created at the start of the transaction, and this read view…id > 100 FOR UPDATE; The above update will create a gap lock that will prevent any rows with id…
Post: Innodb undo segment size and transaction isolation
January 12, 2011 By 3 Comments
…, ACTIVE 15867 sec, process no 19349, OS thread id 1630148928 MySQL thread id 188790, query id 14796224615 host.domain.com 127.0.0.1… data, it even can be seen in SHOW INNODB STATUS: Trx read view will not see trx with id >= F58464, sees < F58462 but whatever isolation mode you’re using beware…
Post: Implementing efficient counters with MySQL
July 1, 2007 By 16 Comments
…not have the problem, if you have innodb_flush_log_at_trx_commit=1 log flushes can well be the problem – even with…with such semantics and it will handle real-time counters very efficiently pushing few updates back to MySQL…
