Hi Arvind, A little test for you.
You have a table that contains 10,000,000 rows that is packed tightly into 1,000,000 data blocks. You have an index that has a level of 4 and has 10,000 leaf blocks. The table is well striped across a number of devices and you have 4 CPUs on the box. You write a simple select statement that queries the table based on the indexed column and *just 10%* of the data needs to be retrieved. You determine that the CBO has performed a full table scan. Do you break out into a nervous sweat or do you sigh thank goodness and worry about something else instead ? Cheers Richard (let me know if you want to know the comparative costs ;) ----- Original Message ----- To: "Multiple recipients of list ORACLE-L" <[EMAIL PROTECTED]> Sent: Thursday, April 03, 2003 2:58 PM > Dear All, > > is there any way to find which tables (table name) are suffering from > full table scan ,so that i can create indexes on them to enhance the > performance. > > > Thanks > > Arvind > -- > Please see the official ORACLE-L FAQ: http://www.orafaq.net > -- > Author: Arvind Kumar > 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: Richard Foote 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).
