I think with LMT's now, it is irrelevant. I still think you need to know approx. how big the table is going to be, and place it in the correct LMT. By this I mean that you may have different LMT's with different uniform extent sizes. A very large table should be placed in the largest LMT tablespace.
at least that's what I would do. the rest of the discussion is now moot - it just doesn't matter anymore. Tom Mercadante Oracle Certified Professional -----Original Message----- Sent: Friday, June 20, 2003 3:21 PM To: Multiple recipients of list ORACLE-L ok, so should the number of extents in a table be considered in table design? there are alot of .pdfs and people on this listserv that say it is irrelevant? > > From: Rachel Carmichael <[EMAIL PROTECTED]> > Date: 2003/06/20 Fri PM 02:44:52 EDT > To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]> > Subject: Re: oracle docs do say # of extents effect performance > > or reasonable to WANT? if I'm running a data warehouse, maybe. If an > OLTP system, orders and customers etc then I'm not likely to WANT the > next block of data on disk for my transaction > > > --- Darrell Landrum <[EMAIL PROTECTED]> wrote: > > My favorite part is > > "and all of the table's data will be stored in a relatively > > contiguous > > section of disk space". > > > > Is this even reasonable to believe, especially with any kind of > > striping implemented? > > > > >>> [EMAIL PROTECTED] 06/20/03 12:00PM >>> > > Two reasons: > > > > a) if you go into extent map blocks then you will > > suffer an overhead of at least 1 billionth of a > > percent :-) > > > > b) more seriously, its generally easier to pick up a > > "rogue" table if its run into thousands of extents and > > you had not intended it to. Its not a performance > > problem per se, but its indicative that its a segment > > thats doing something that was unforseen in the design > > phase.. > > > > hth > > connor > > > > --- [EMAIL PROTECTED] wrote: > I just read a .pdf by a > > couple of people at oracle > > > called Stop Fragmenting and start living where it > > > says not worry about the number of extents in a > > > tablespace. However in the administrators doc it > > > says the following: > > > > > > Estimate Table Size and Set Storage Parameters > > > Estimating the sizes of tables before creating them > > > is useful for the following reasons: > > > > > > You can use the combined estimated size of tables, > > > along with estimates for indexes, rollback segments, > > > and redo log files, to determine the amount of disk > > > space that is required to hold an intended database. > > > From these estimates, you can make correct hardware > > > purchases and other decisions. > > > > > > You can use the estimated size of an individual > > > table to better manage the disk space that the table > > > will use. When a table is created, you can set > > > appropriate storage parameters and improve I/O > > > performance of applications that use the table. For > > > example, assume that you estimate the maximum size > > > of a table before creating it. If you then set the > > > storage parameters when you create the table, fewer > > > extents will be allocated for the table's data > > > segment, and all of the table's data will be stored > > > in a relatively contiguous section of disk space. > > > This decreases the time necessary for disk I/O > > > operations involving this table. > > > > > > this is at the following link: > > > > > > > > > http://download-west.oracle.com/docs/cd/A87860_01/doc/server.817/a76956/tabl es.htm#208 > > > > > > > > am I reading this wrong or is Oracle stating that > > > you should have less extents in a table? I know > > > several people on here have posted that the number > > > of extents used by an object is almost irrelevant. > > > > > > -- > > > 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). > > > > ===== > > Connor McDonald > > web: http://www.oracledba.co.uk > > web: http://www.oaktable.net > > email: [EMAIL PROTECTED] > > > > "GIVE a man a fish and he will eat for a day. But TEACH him how to > > fish, and...he will sit in a boat and drink beer all day" > > > > > ________________________________________________________________________ > > Want to chat instantly with your online friends? Get the FREE Yahoo! > > Messenger http://uk.messenger.yahoo.com/ > > -- > > Please see the official ORACLE-L FAQ: http://www.orafaq.net > > -- > > Author: =?iso-8859-1?q?Connor=20McDonald?= > > 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: Darrell Landrum > > 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!? > SBC Yahoo! DSL - Now only $29.95 per month! > http://sbc.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: <[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: Mercadante, Thomas F 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).
