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/tables.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] 
> 
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=====
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"

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