Stephen, I do it all the time. Actually you don't have to lock the table; you may simply quiesce the table, meaning no transations will be allowed.
Steps: Quiesce the table Apply all the pending logs in the deferred trans queue on secondary database Truncate The MLOG$ table. No issues; in fact I think (note sure) it is supported by Oracle. And it should be; MLOG$ tables are just plain simple tables anyway. Hope this helps. Arup Nanda ----- Original Message ----- To: "Multiple recipients of list ORACLE-L" <[EMAIL PROTECTED]> Sent: Thursday, June 12, 2003 3:54 PM > > Among some of the "Rube Goldberg" applications around here, is one that has > multiple replication clients that subscribe to a master. For whatever > reason, we might have a client not update for a while and the MLOG table(s) > get big. Then, after that, every update has to read up to sky-high high > water mark. From the looking around we have done, the thing to do to get > the HWM back down without rattling replication seems to be (during a time > when we know no updates are going into the master): > > lock table xyz in exclusive mode; > alter table mlog$_xyz move tablespace over_there; > alter table mlog$_xyz move tablespace back_here; (optional, I suppose) > rollback; (release the lock) > > Does anyone know of any issues, pitfalls, invitation for disaster, etc. with > this? > -- > Please see the official ORACLE-L FAQ: http://www.orafaq.net > -- > Author: Stephen Lee > INET: [EMAIL PROTECTED] > > Fat City Network Services -- 858-538-5051 http://www.fatcity.com > San Diego, California -- Mailing list and web hosting services > --------------------------------------------------------------------- > To REMOVE yourself from this mailing list, send an E-Mail message > to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in > the message BODY, include a line containing: UNSUB ORACLE-L > (or the name of mailing list you want to be removed from). You may > also send the HELP command for other information (like subscribing). > -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Arup Nanda INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
