Hi! Btw, minimum inittrans is 2 in 9i when block is formatted using conventional insert and it's 3 when a block is formatted using direct path insert, even though data dictionary claims otherwise.
Optimal inittrans for a *block* is the number of concurrent transactions in it. Optimal inittrans for a segment should be set such way that majority of the blocks shouldn't have the need to extend ITL area during transaction activity in them. That means, if 99% of your blocks experience 2 concurrent transactions at a given time, but 1% have 4 transactions, then I'd still set inittrans to 2, but maxtrans to higher value instead. It is hard to calculate the number of concurrent transactions in a block, since we don't have much control in which blocks our data is stored, nor we don't know which exact rows will be modified in given time that well either. One common pitfall is a recommendation to set inittrans for table as high as many concurrent inserts to it you have -> this may lead into overly large ITLs, because if using multiple freelists and freelist groups, inserts are spread into several blocks anyway. An easy for smapling optimal inittrans for existing data is to use "alter system dump datafile" command to dump a range of datablocks and grep for "itc:" from the file, this shows you max interested transaction count for evey block. Tanel. ----- Original Message ----- To: "Multiple recipients of list ORACLE-L" <[EMAIL PROTECTED]> Sent: Thursday, September 25, 2003 1:13 PM > Tables have default INITRANS value. > I want to set this parameter to a suitable value. Because INITRANS is 1 as default value and I want to avoid from load of dynamic > But how can I figure out suitable value of this parameter for each table. > > > -- > Please see the official ORACLE-L FAQ: http://www.orafaq.net > -- > Author: <[EMAIL PROTECTED] > 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: Tanel Poder 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).
