…pessimistic locking cluster-wide, it uses optimistic locking. Initially a transaction on PXC behaves much like a regular Innodb transaction. It does pessimistic locking…
Post: Percona XtraDB Cluster: Multi-node writing and Unexpected deadlocks
August 17, 2012 By 17 Comments
Comment: Test Drive of Solid
September 25, 2006 By 5 Comments
… integration with the MySQL Server. I will address below the rest of the issues that you raised. About the pessimistic locking, our release notes mention that we do not yet support pessimistic locking. However, we could have been… FOR UPDATE behaves differently from InnoDB. One thing to remember is that our Storage Engine for MySQL comes from our main code…
Post: Heikki Tuuri Innodb answers - Part I
October 26, 2007 By 19 Comments
… a merge is attempted. btr0cur.h: /* In the pessimistic delete, if the page data size drops … COMMITTED, then InnoDB normally does not lock the ‘gaps’, and it does not lock rows whose latest …new features in MySQL 5.1 Q15: How frequently does Innodb fuzzy checkpointing is activated HT: InnoDB flushes …
Comment: Product to try: MySQL/MariaDB-Galera 0.8
June 13, 2011 By 34 Comments
…, it is more solid than MySQL semi-sync in that the transaction is guaranteed to apply to InnoDB tablespace – if this fails… try to write to same rows on a single InnoDB instance, then locks will be taken on those rows, and possibly the… transactions. (I suppose this is a variation of optimistic vs pessimistic locking problem.)
Comment: Percona XtraDB Cluster reference architecture with HaProxy
June 22, 2012 By 63 Comments
… you lock records in InnoDB with PXC, records are only locked on the local node. Let’s say you open up 2 mysql sessions… the application level by retrying transaction. This is called optimistic locking, because here we are being optimistic. This means we assume…, we want these to be rare. On the other side, pessimistic locking across nodes would involve much more network roundtrips, which would…
Post: Test Drive of Solid
September 22, 2006 By 5 Comments
… its interpretation by Innodb. Let’s look how PESIMISTIC works (mysqld started with –soliddb_pessimistic). Test 1: Deadlock detection: Session1: mysql> begin; Query… READ-COMMITED for locking reads (SELECT FOR UPDATE/LOCK IN SHARE MODE) as only actual row versions can be locked. With Innodb we would…
Post: Countless storage engines
May 3, 2007 By 6 Comments
…presented. In good old time when Oracle bought InnoDB, MySQL did one step – announced MySQL supports Plugginable Storage Architecture. In that time …attractive from performance reasons. Solid The engine with both pessimistic and optimistic locking on the table level. The interesting note Solid …
