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Oracle analyze [message #272742]

Sat, 06 October 2007 23:16

tanmoy1048
Messages: 133
Registered: June 2007

Senior Member

I m using oracle 10gR2.
When oracle itself analyze(or something) its objects. For example,
I have a table test.Now
Select count(*) from test
And, select num_rows from tabs where table_name='TEST';
results is different. When oracle will give the correct result.

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Re: Oracle analyze [message #272746 is a reply to message #272742]

Sat, 06 October 2007 23:51

BlackSwan
Messages: 26766
Registered: January 2009
Location: SoCal

Senior Member

>results is different.
OK, different for WHAT????
We are not looking over your shoulder & seeing what you are seeing.
>When oracle will give the correct result.
HUH?
What results does Oracle give & how do you (or I) know it is correct?

Answer is 5! is that correct?

I am not sure what exactly is the question?

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Re: Oracle analyze [message #272748 is a reply to message #272742]

Sun, 07 October 2007 00:04

tanmoy1048
Messages: 133
Registered: June 2007

Senior Member

for smart answer.
>Select count(*) from test
whats the output of this SQL?the number of rows.
>select num_rows from tabs where table_name='TEST';
whats the output of this SQL?the number of rows after gathering the statistics.And sometimes the results are different. My question was WHY??

Anyway I got the answer,
http://download.oracle.com/docs/cd/B19306_01/server.102/b14231/tasks.htm#ADMIN0235

[mod-edit] removed illiterate IM speak.

[Updated on: Mon, 08 October 2007 08:11] by Moderator

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Re: Oracle analyze [message #272751 is a reply to message #272742]

Sun, 07 October 2007 00:14

BlackSwan
Messages: 26766
Registered: January 2009
Location: SoCal

Senior Member

>Anyway I got the answer,
>htt://download.oracle.com/docs/cd/B19306_01/server.102/b14231/tasks.htm#ADMIN0235

Color me dense.
If the answer has been available for more than a day or two,
what exactly is the answer & why was the question even asked?

NOTHING that has been posted allows anyone to confirm or deny ANY statement regarding any "problem" or "solution".

[Updated on: Sun, 07 October 2007 00:22] by Moderator

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Re: Oracle analyze [message #272852 is a reply to message #272748]

Mon, 08 October 2007 01:11

Littlefoot
Messages: 21823
Registered: June 2005
Location: Croatia, Europe

Senior Member
Account Moderator

tanmoy1048,

how does "Managing Automatic System Tasks Using the Maintenance Window" document explain different results between

Select count(*) from test;

and

select num_rows from tabs where table_name='TEST';

Does it mean that you have analyzed the 'TEST' table a long time ago (relatively speaking) and have added/removed records from the same table in the meantime and solved the problem by scheduling ANALYZE regularly, or ...?

[Updated on: Mon, 08 October 2007 01:12]

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Re: Oracle analyze [message #272878 is a reply to message #272742]

Mon, 08 October 2007 02:03

tanmoy1048
Messages: 133
Registered: June 2007

Senior Member

I just asked why those results are different.And so far I understand ..its a automatic task that collect the statistics of the table by using that window.

It was not my problem And I didnt schedule any analyze.

thanx

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Re: Oracle analyze [message #272895 is a reply to message #272878]

Mon, 08 October 2007 02:25

Michel Cadot
Messages: 68718
Registered: March 2007
Location: Saint-Maur, France, https...

Senior Member
Account Moderator

There are different because one is a count by scan of current data and the other one is a statistic of past data.

Regards
Michel

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