Re: Automatic statistics don't work on 10g (job and statistics level OK)

From: Fuad Arshad <fuadar_at_yahoo.com>
Date: Thu, 24 Nov 2005 09:45:57 -0800 (PST)
Message-ID: <20051124174558.20929.qmail@web80513.mail.yahoo.com>

as far a si recall it will only analyze the table if the rate of change is more than 10%. i might be wrong but that is what i've observed on my database runnning 10.1.0.4

Juan Carlos Reyes Pacheco <juancarlosreyesp_at_gmail.com> wrote: I want to share something curious happened to me. I am writing a course on tuning, and I was testing the automatic gathering on 10g, only to be sure I created an empty table and waited to see it analyzed to the next day, and in two days it was unanalyzed.

21:39:21 SQL> select last_analyzed from dba_tables where owner='CACHUN' and table_name='TEST';
LAST_ANA

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next day,
08:16:47 SQL> select last_analyzed from dba_tables where owner='CACHUN' and table_name='TEST';
LAST_ANA

---

I checked
SELECT STATE FROM DBA_SCHEDULER_JOBS WHERE JOB_NAME = 'GATHER_STATS_JOB'; STATE

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SCHEDULED statistics level was TYPICAL

And the job didn't executed I checked dba_optstat_operations.

I checked if the job was working
08:21:04 SQL> EXEC SYS.DBMS_SCHEDULER.RUN_JOB('GATHER_STATS_JOB'); PL/SQL procedure successfully completed. 08:24:06 SQL> select last_analyzed from dba_tables where owner='CACHUN' and table_name='TEST';
LAST_ANAL

---

20-NOV-05 And it was working, so I dropped and recreated the table using another name. Then I query select * from cachun.test where object_name like 'A%', I had the theory it was going to be analyzed if the job found it had been tried to use, and nothing.

Then I continued with my test gather statitsics for fixed views and sys, and it started to work. And from then is working ok, I promess the first think I'm going to do after creating a database is gathering sys and fixed views statistics, and I'm run my own gathering statistics job, only to be sure :).

The only strange I did (it is a seed databaes where I created a very few tables, less than 2 MB). Is the fact the schema where I created the table was created automatically using datapump.

Does this happened to anybody or is the normal behaviour?
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8 years of experience in Oracle 7,8i,9i,10g and developer 6i
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http://www.freelists.org/webpage/oracle-l Received on Thu Nov 24 2005 - 11:48:13 CST