…, the triggers must be changed. The work in the trigger is immediate and affects every transaction. Finally, MySQL has limited trigger support…c2: 2 *************************** 2. row *************************** dml_type: 1 uow_id: 10 fv$server_id: 999 c1: 3 c2: 3 *************************** 3. row …
Post: Ultimate MySQL variable and status reference list
January 8, 2011 By 4 Comments
… referring to the amazing MySQL manual, especially the option and variable reference table….table_sizeblogpercona.commanual tmpdirblogpercona.commanual transaction_alloc_block_sizeblogpercona.commanual transaction_isolationblogpercona.commanual transaction_prealloc_sizeblogpercona.commanual tx_…
Post: Why audit logging with triggers in MySQL is bad for replication
September 29, 2008 By 10 Comments
…using two triggers on that table. select trigger_name, event_object_table, Event_Manipulation from information_schema.triggers where trigger_schema = ‘mydb’…_ID, Name, Value, Field_Id) Values (Old.Foo_History_ID, Old.Name, Old.Value, Old.Field_Id); Transaction 1 starts and updates. Start Transaction;…
Post: Bug#12704861
November 20, 2011 By 1 Comment
… problem that is fixed in MySQL 5.1.60. I’ll …after btr_cur_pessimistic_update()” (revision id: marko.makela@oracle.com-20110616072721-8bo92ctixq6eqavr … tablespace file bounds. This should trigger an assertion failure in fil_io()… mini-transaction of the BLOB write, not to the mini-transaction of the …
Post: INSERT INTO ... SELECT Performance with Innodb tables.
July 12, 2006 By 21 Comments
… with caution. Note disabling binary logs is not enough to trigger relaxed locks. You have to set innodb_locks_unsafe_for… SHOW INNODB STATUS: —TRANSACTION 0 42304626, ACTIVE 14 sec, process no 29895, OS thread id 2894768 updating or deleting mysql tables in use…; asc ;; —————— —TRANSACTION 0 42304624, ACTIVE 37 sec, process no 29895, OS thread id 4058032 fetching rows, thread declared inside InnoDB 3 mysql tables…
Comment: Drilling down to the source of the problem
November 14, 2008 By 7 Comments
… release, and I have some tables that use BEFORE INSERT triggers to update another value in a different table. I was… InnoDB. TRANSACTION 1 2897690526, not started, process no 17811, OS thread id 1197627712, thread declared inside InnoDB 499 MySQL thread id 243641148, query id 2415637111…
Post: MySQL Query Cache
July 27, 2006 By 69 Comments
…” which is quite helpful for MySQL Performance optimization tasks but there… implement. Might not work with transactions – Different transactions may see different states … such as UUID(), RAND(), CONNECTION_ID() etc it will not be …to fragmentation lowmem_prunes can be triggered even if there is some …
Post: How Percona does a MySQL Performance Audit
November 24, 2008 By 17 Comments
…mining stock market transactions,” or whatever the…power management: processor : 7 vendor_id : GenuineIntel cpu family : 6 …mysql –user=mysql –pid-file=/var/run/mysqld/mysqld.pid –skip-external-locking –port=3306 –socket=/var/db/mysql/mysql…_SCHEMA query will surely trigger errors about this.)…
Post: Debugging problems with row based replication
May 6, 2010 By 10 Comments
… format does offer advantages particularly if triggers or stored procedures are used, …340782 # at 340823 #100506 12:42:56 server id 1Â end_log_pos 340678Â …transaction. You should always set read_only = true on your MySQL slaves to prevent accidental changes in data from happening! *edit* The MySQL…
Comment: Why MySQL could be slow with large tables ?
June 20, 2007 By 139 Comments
…: SELECT column2, column3 FROM table1 WHERE column1 = id; The index is on column1. So when I… or come to its knees with the transaction record as mentioned above (a small fraction …referential integrity and such, MySQL was a pathetic “option”. Yes 5.x has included triggers, stored procedures, and…
