RE: Chained vs. migrated rows - Any easy way to tell the

Ah... Thanks.  I should just leave the dba_tables.chain_cnt alone?   I
could clean it up dba_tables I suppose?

Not sure about Martins comment concerning object_space_usage.


Joel Patterson
Database Administrator
joel.patterson@xxxxxxxxxxx
x72546
904  727-2546

-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Martin Berger
Sent: Tuesday, November 18, 2008 7:44 AM
To: ORACLE-L
Subject: Re: Chained vs. migrated rows - Any easy way to tell the


would it be save to run
DBMS_SPACE.OBJECT_SPACE_USAGE to check for chain_pcent  > 0 without  
disturbing DBMS_STATS at all?

just a guess - never tried yet.
And I also doesn't see a valid answer for the question between chained  
and migrated rows there.

br.
  Martin

--
Martin Berger  http://berxblog.blogspot.com

Am 06.11.2008 um 10:35 schrieb Christian Antognini:

> Hi Joel
>
>> The difference between dba_tables.chain_cnt and what is contained
>> in chained_rows table now is still a mystery.  Stats are collected
>> nightly.
>
> DBMS_STATS doesn't compute the value chain_cnt. Therefore, there are  
> two
> possibilities:
> 1) dba_tables.chain_cnt = 0
> 2) dba_tables.chain_cnt > 0
>
> If 1, either the table doesn't contain chained/migrated rows or  
> ANALYZE
> was never used to compute statistics for it.
>
> If 2, at some time in the past the statistics were compute with  
> ANALYZE.
> Since DBMS_STATS doesn't compute it, you see the value at the time of
> the last execution of ANALYZE.

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