What we found is that it doesn't matter which tablespace the session causing the wait is accessing. As explained to me (by Dan Fink I believe), Oracle doesn't KNOW if that transaction will involve the tablespace you are trying to make read-only or if it will not. So rather than take a chance, the alter tablespace waits for all transactions executing at the time it was issued to complete.
--- AK <[EMAIL PROTECTED]> wrote: > Rachel , > Thanks for the Reply . On checking further I found that this session > was > waiting on a lock from another session . But the table or object > which was > locked by other session does not belong to this tablespace . Then why > does > the read only operation waiting for the lock to release ?? Does it > mean > that all transactions which started before issuing "alter tablespace > read > only" should be finished ?? > > -ak > > > ----- Original Message ----- > To: "Multiple recipients of list ORACLE-L" <[EMAIL PROTECTED]> > Sent: Wednesday, July 30, 2003 5:44 PM > > > > Ah, one I have the answer to, as I had a similar question a while > back. > > > > The alter tablespace read only is waiting for every query which > started > > before the alter tablespace was issued to finish. Just in case one > of > > them might write to that tablespace and therefore fail. > > > > so while the database does not HAVE to be quiesced before you issue > an > > alter tablespace read only, it helps to prevent waits > > > > > > --- Tanel Poder <[EMAIL PROTECTED]> wrote: > > > Hi! > > > > > > Alter tablespace read only performs checkpoint on datafiles > belonging > > > to this tablespace. But 10 minutes on an idle system is > indicating > > > some problems. > > > > > > Check this: select event, p1, p2, p3, state from v$session_wait > where > > > sid = <sid of waiting session>; > > > > > > You should get some indication, on what your alter tablespace > command > > > is waiting. > > > > > > Tanel. > > > > > > ----- Original Message ----- > > > From: AK > > > To: Multiple recipients of list ORACLE-L > > > Sent: Wednesday, July 30, 2003 10:34 PM > > > Subject: read only tablespace > > > > > > > > > why does it take long time to turn a tablespace read only . I > > > issued the command 10 mins back , its still not returned . There > is > > > almost no activity in db . > > > > > > 8.1.7.4 > > > hp-ux > > > > > > -ak > > > > > > __________________________________ > > Do you Yahoo!? > > Yahoo! SiteBuilder - Free, easy-to-use web site design software > > http://sitebuilder.yahoo.com > > -- > > Please see the official ORACLE-L FAQ: http://www.orafaq.net > > -- > > Author: Rachel Carmichael > > 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: AK > 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). > __________________________________ Do you Yahoo!? Yahoo! SiteBuilder - Free, easy-to-use web site design software http://sitebuilder.yahoo.com -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Rachel Carmichael 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).
