On index-obsessed apps, you'll often see massive amount of LIO to a target of a nested loop. ie, scan mega table and then index probe the inner table for every row of the mega table...
Generally you'll see smoke coming out of the index root/branch blocks on the target table :-) hth connor --- Greg Moore <[EMAIL PROTECTED]> wrote: > A while back someone mentioned that the two main > causes of slow SQL are > excesive LIO's and excesscive database calls, which > show up as excessive CPU > use and excessive network traffic, respectively. > > Regarding the database calls, is there a "classic" > reason for this problem? > > My best guess is it's caused by an SQL statement in > a PL/SQL loop, which > could be rewritten as a single SQL statement. But > is this the single, > commonly seen cause for this problem, or are there > other common ways this > inefficiency is introduced? > > Thanks in advance for help in understanding this. > > -- > Please see the official ORACLE-L FAQ: > http://www.orafaq.com > -- > Author: Greg Moore > 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 http://www.oracledba.co.uk http://www.oaktable.net "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" __________________________________________________ Do You Yahoo!? Everything you'll ever need on one web page from News and Sport to Email and Music Charts http://uk.my.yahoo.com -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- 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).
