BEGIN; UPDATE Inno_tbl SET x = 100; INSERT INTO Myisam_tbl SELECT x FROM Inno_tbl; UPDATE Inno_tbl SET x = 200; INSERT INTO Myisam_tbl SELECT x FROM Inno_tbl; COMMIT;
To get the right values in Myisam_tbl, the transacted and non-transacted commands must be interleaved. (I am assuming SBR, not RBR.) > -----Original Message----- > From: Shawn Green [mailto:shawn.l.gr...@oracle.com] > Sent: Wednesday, August 01, 2012 12:07 PM > To: Rick James > Cc: David Lerer; Zhigang Zhang; mysql@lists.mysql.com > Subject: Re: How often the slave to pull data from master? > > On 8/1/2012 1:13 PM, Rick James wrote: > > That leads to another question... > > Does this 'separate cache' contain an extra copy (vs the 'only' copy) > of the non-transacted events? > > I would expect that it must be an extra copy. > > > > No. The non-transacted events are applied to the tables they belong to > as they are executed. We track them in this cache for replication > purposes. Are you worried about a race between a crash and the time > where the cache is applied to the main binary logs? > > This is a very unlikely event for two reasons: > > 1) the non-transacted change must occur within a transaction > > 2) most users that use transactions only use transaction-enabled > storage engines (InnoDB). > > So in order to lose non-transacted changes from a crash that happens > before the cache is appended to the binary log, you must > a) have a sequence of statements (or ROW-based changes) that is smaller > than --binlog-cache-size limit > b) have a mixed-mode transaction. > > If this is a valid concern for your usage pattern set --binlog-cache- > size to a smaller value. > http://dev.mysql.com/doc/refman/5.5/en/replication-options-binary- > log.html#sysvar_binlog_cache_size > > -- > Shawn Green > MySQL Principal Technical Support Engineer Oracle USA, Inc. - Hardware > and Software, Engineered to Work Together. > Office: Blountville, TN > -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/mysql
