OK, Thanks to all of you for the input. Only if we can can have a big storage to put all the Oracle internals into our brains :)
There is a nice article in Metalink : Note 62005.1 Cheers Kumanan > -----Original Message----- > From: Rachel Carmichael [SMTP:[EMAIL PROTECTED]] > Sent: 15 March 2002 20:59 > To: Multiple recipients of list ORACLE-L > Subject: RE: A rollback segment question on minextents > > yes, Jonathan Lewis was kind enough to correct me privately on this. > > It is indeed only the first block that's used for header information, > the rest of the block is used for rollback change vectors. > > > --- [EMAIL PROTECTED] wrote: > > While on the subject.. > > Please see the Oracle Metalink Note: 1029850.6. > > It says the first "block" of the first segment contains header > > information. > > > > > > > -----Original Message----- > > > From: Kumanan Balasundaram > > > Sent: 15 March 2002 17:59 > > > To: '[EMAIL PROTECTED]' > > > Cc: '[EMAIL PROTECTED]' > > > Subject: RE: A rollback segment question on minextents > > > > > > Oracle recommends the size NEXT=INITIAL. > > > So if I had 10M initial, then most of the initial beyond the > > > header info will be wasted? Sure not! > > > > > > Kumanan > > > > > > -----Original Message----- > > > From: Rachel Carmichael [SMTP:[EMAIL PROTECTED]] > > > Sent: 11 March 2002 21:48 > > > To: Multiple recipients of list ORACLE-L > > > Subject: RE: A rollback segment question on minextents > > > > > > the first extent is used by oracle as the segment header to manage > > > the > > > transaction information within the rollback segment. The second > > > extent > > > contains the actual change vectors > > > > > > > > > --- [EMAIL PROTECTED] wrote: > > > > Hi, > > > > > > > > My point was that it could allocate one more extent as per need. > > > Why > > > > the > > > > need to minextents = 2? > > > > > > > > Thanks > > > > Kumanan > > > > > > > > > -----Original Message----- > > > > > From: Stephane Faroult [SMTP:[EMAIL PROTECTED]] > > > > > Sent: 07 March 2002 20:54 > > > > > To: Multiple recipients of list ORACLE-L > > > > > Subject: Re: A rollback segment question on minextents > > > > > > > > > > [EMAIL PROTECTED] wrote: > > > > > > > > > > > > Hi, > > > > > > > > > > > > I was wondering why Oracle force minextents for rollback > > > > > > segments to be two. Why can't we have minextents zero or > > > > > > no minextents clause at all. > > > > > > > > > > > > We can surely set initial extent to be large enough > > ourselves > > > > > > and next extent sized accordingly. > > > > > > > > > > > > Can someone enlighten me on the reason/thought behind this? > > > > > > > > > > > > Many thanks > > > > > > > > > > > > Kumanan Balasundaram > > > > > > Database Administrator, IT > > > > > > QXL ricardo plc > > > > > > www.qxl.com > > > > > > P: +44 (0)208 962 7409 > > > > > > > > > > Oracle doesn't reuse an extent which contains active > > > transactions. > > > > What > > > > > do you think would happen when you reach the end of your > > initial > > > > extent > > > > > ? Exactly. > > > > > -- > > > > > Regards, > > > > > > > > > > Stephane Faroult > > > > > Oriole Ltd > > > > > -- > > > > > Please see the official ORACLE-L FAQ: http://www.orafaq.com > > > > > -- > > > > > Author: Stephane Faroult > > > > > INET: [EMAIL PROTECTED] > > > > > > > > > > Fat City Network Services -- (858) 538-5051 FAX: (858) > > > 538-5051 > > > > > San Diego, California -- Public Internet access / > > Mailing > > > > Lists > > > > > > > > > > > > > > -------------------------------------------------------------------- > > > > > 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.com > > > > -- > > > > Author: > > > > INET: [EMAIL PROTECTED] > > > > > > > > Fat City Network Services -- (858) 538-5051 FAX: (858) > > > 538-5051 > > > > San Diego, California -- Public Internet access / Mailing > > > > Lists > > > > > > > > > -------------------------------------------------------------------- > > > > 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!? > > > Try FREE Yahoo! Mail - the world's greatest free email! > > > http://mail.yahoo.com/ > > > -- > > > Please see the official ORACLE-L FAQ: http://www.orafaq.com > > > -- > > > Author: Rachel Carmichael > > > INET: [EMAIL PROTECTED] > > > > > > Fat City Network Services -- (858) 538-5051 FAX: (858) > > 538-5051 > > > San Diego, California -- Public Internet access / Mailing > > > Lists > > > > > -------------------------------------------------------------------- > > > 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! Sports - live college hoops coverage > http://sports.yahoo.com/ > -- > Please see the official ORACLE-L FAQ: http://www.orafaq.com > -- > Author: Rachel Carmichael > INET: [EMAIL PROTECTED] > > Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 > San Diego, California -- Public Internet access / Mailing Lists > -------------------------------------------------------------------- > 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.com -- Author: INET: [EMAIL PROTECTED] Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- 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).
