Global Transactions Identifiers are one of the new features regarding replication in … probably want to gradually enable GTID replication for an easier rollback in the event of a problem. And some items in… ON with servers where gtid_mode is OFF. This would greatly simplify the transition to GTID-based replication and allow easier rollbacks…
Post: Innodb undo segment size and transaction isolation
January 12, 2011 By 3 Comments
… their impact on undo space usage. Inserts only have a small record in undo space so row can be deleted on rollback, update… to appropriate blob version. Now lets move on to the main topic – how does transaction isolation affects purging ? Innodb is smart and… your application supports it. Note you can set isolation mode on transaction start so you do not have to just pick one…
Comment: Pitfalls of converting to InnoDB
March 8, 2007 By 16 Comments
…->transaction_in_progress) { $this->rollback(); } } public function commit() { $ret = self::$mysqli->commit(); $this->transaction_in_progress = false; } public function rollback() { $ret = self::$mysqli->rollback(); $this->transaction_in_progress = false; } I notice your code above has a loop on…
Post: Ultimate MySQL variable and status reference list
January 8, 2011 By 4 Comments
…commanual innodb_replication_delayblogpercona.commanual innodb_rollback_on_timeoutblogpercona.commanual Innodb_row_lock_current…commanual tmpdirblogpercona.commanual transaction_alloc_block_sizeblogpercona.commanual transaction_isolationblogpercona.commanual transaction_prealloc_sizeblogpercona….
Comment: When does Innodb Start Transaction ?
January 12, 2011 By 9 Comments
… something that starts a transaction (say, INSERT or SELECT). Generally, the standard says that on ROLLBACK TO SAVEPOINT “the SQL-transaction is restored to… as the transaction simply did not exist back than, your ROLLBACK TO SAVEPOINT will rollback the transaction, and no transaction will exist right after ROLLBACK TO…
Post: Fix of InnoDB/XtraDB scalability of rollback segment
January 18, 2009 By 9 Comments
… results the problem is in concurrency on rollback segment, which by default is single and all transactions are serialized accessing to segment. Fortunately InnoDB internally has mechanism to support multiple rollback segments – and Yasufumi…
Comment: Checking for a live database connection considered harmful
May 5, 2010 By 38 Comments
… my reply here. MySQL used to roll back the whole transaction on a lock wait timeout, but since 5.0 it only…/innodb-parameters.html#sysvar_innodb_rollback_on_timeout There are cases where it rolls back the whole transaction (deadlock is one). I don’t think we need to care about explicit ROLLBACK, only what happens…
Post: Falcon Storage Engine Design Review
January 12, 2007 By 19 Comments
… it can be the problem – if transaction spawns multiple databases you need multiple log flushes on commit, plus ether you use XA to synchronize these which is expensive or it will be possible for your transaction… very long rollbacks on recovery but also means you should have enough memory to hold all transaction changes. I agree most transactions are small…
Post: Shard-Query EC2 images available
May 11, 2011 By 2 Comments
… `Carrier` (`Carrier`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1 COMMENT=’Contains information on flights, and what airline offered those flights and the flight… innodb-replication-delay=# innodb-rollback-on-timeout innodb-rollback-segments=16 innodb-stats-auto-update=0 innodb-stats-on-metadata=0 innodb-stats-sample…-cache-size=32 thread-stack=256K tmp-table-size=64M transaction-isolation=READ-COMMITTED user=mysql wait-timeout=86400 To be…
Post: Replication checksums in MySQL 5.6
February 15, 2013 By 3 Comments
… executed on a replica instead of the master non deterministic queries bad use of replication filters rollback of transactions mixing transactional and non-transactional tables The real problem is that replication may keep on running without error…
