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need assist to delete histograms [message #339046]

Wed, 06 August 2008 11:49

kumar.joy
Messages: 69
Registered: August 2007
Location: morrisville

Member

Experts,

i have a question. one of my database is suffering with bind pecking. for this i got instruction from my teammates to delete histograms.

can any one provide some information about histograms and how to remove histograms.

Regards,

Jyothy..

[Updated on: Wed, 06 August 2008 11:49]

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Re: need assist to delete histograms [message #339047 is a reply to message #339046]

Wed, 06 August 2008 11:52

BlackSwan
Messages: 26766
Registered: January 2009
Location: SoCal

Senior Member

http://download.oracle.com/docs/cd/B19306_01/server.102/b14211/toc.htm

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Re: need assist to delete histograms [message #339054 is a reply to message #339046]

Wed, 06 August 2008 12:09

Mahesh Rajendran
Messages: 10708
Registered: March 2002
Location: oracleDocoVille

Senior Member
Account Moderator

>>information about histograms
Way too much to be explained in a forum.
Oracle docs carry all the information you want.
>> how to remove histograms
Depends on how you collect statistics and usage of METHOD_OPT.
If you are absolutely sure you may want to check try that in test environment and only for that specific table.
http://download.oracle.com/docs/cd/B19306_01/server.102/b14211/stats.htm#i42219
I would try with 'FOR ALL COLUMNS SIZE 1'

[Updated on: Wed, 06 August 2008 12:10]

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