Comments on: Stabilize Oracle 10G’s Bind Peeking Behaviour by Cutting Histograms

By: francesco

francesco — Tue, 12 Apr 2011 08:54:13 +0000

Very helpfull and interseting, thank you.

By: Histograms and Bind Variables, But Why? « Charles Hooper's Oracle Notes

Histograms and Bind Variables, But Why? « Charles Hooper's Oracle Notes — Sat, 29 Jan 2011 14:46:53 +0000

[...] Stabilize Oracle 10G’s Bind Peeking Behaviour by Cutting Histograms [...]

By: Advait

Advait — Wed, 22 Sep 2010 04:46:10 +0000

Nice article !!

By: Anuj Singh

Anuj Singh — Tue, 14 Sep 2010 10:49:24 +0000

very very good article for :Bind variable peeking and well explained …

br
anuj

By: Tommy Petersen

Tommy Petersen — Fri, 30 Jul 2010 12:46:15 +0000

Bind variable peeking can also be confused by partitioning. If you have both small and large partitions for the same table, you could end up with a bad access path because of that, even without histograms.

By: Paul

Paul — Fri, 07 May 2010 18:50:43 +0000

Currently am facing a case where we get a bad plan when Oracle peeks an out-of-range varchar ( out-of-range on the low side ) – this is without histograms – it’s as if the out-of-range code path doesn’t handle this case well. I really don’t want to disable bind variable peeking for the whole user community, but I can’t get to the application code either. Just thought I’d add the extra complication of out-of-range values – usually with bind variable peeking we talk about skewed data. Our data is plenty skewed, but I got rid of the histograms, and when that out-of-range value shows up the plan goes south.

By: Lokesh Pandey

Lokesh Pandey — Fri, 26 Feb 2010 02:36:58 +0000

When dba_tab_histograms table will have 2 rows for a specific table and a specific column? one record with ENDPOINT_NUMBER as 0 and the second record with ENDPOINT_NUMBER as 1

By: pramod

pramod — Mon, 21 Dec 2009 05:52:20 +0000

Excellent Post..This Post solved one of my bugging problems :)
No histograms…when not required…
and When required we have to use skew only option (Even it may take some time).

By: Alon Principal

Alon Principal — Sun, 04 Oct 2009 12:53:06 +0000

Hi,

I’ve found your article very informative but there is still one question that is remained not answered for me and it also bothers me in my actual work is – how can I manually set the values of histograms?

I’m talking about something like DBMS_STATS.SET_COLUMN_STATS…

It’ll be very helpful in cases that I know the right skewed distribution of data in some column and don’t want to take a chance that during statistics gathering the distribution of the values in that column may be unusual due to irregular high/low load or error.

Thank you in advance,
Alon.

By: amit

amit — Mon, 15 Jun 2009 12:20:08 +0000

Very Good Artical..