Partitioned table space stats ... Incremental question and TEMP tablespace usage...
Date: Thu, 22 Mar 2012 11:12:00 -0400
- I have been steeped in a bunch of Incremental Stats blog posts for the past week and I think I am just confusing myself at this point.
If I want to use Incremental stats on my Partitioned tables, I am under the impression I need to use AUTO_SAMPLE_SIZE. Is this accurate?
Is it not possible to use a custom Sample Size in conjunction with Incremental Stats? Or is it possible but my synopses will be less accurate?
2) Reason I am asking is that I have a table that I can't get stats on... keeps erroring out so I am trying to figure out how I can get a successful stats run on it. I would like to try reducing the sample size by changing from Auto to a small percentage of the table size.
This is a generic 18.104.22.168 (straight install with no patches) on Solaris 64-bit
Table MYSCHEMA.MYTABLE has 42 partitions, 15 gb across all partitions, largest partition is 1.75gb, but most are in the 300mb range.
I have 64gb temp space defined for this database, and no one else is logged on.
I have the table stats preferences configured like this:
EXEC DBMS_STATS.set_table_prefs('MYSCHEMA', 'MYTABLE', 'INCREMENTAL', 'TRUE'); EXEC DBMS_STATS.set_table_prefs('MYSCHEMA', 'MYTABLE', 'GRANULARITY', 'AUTO'); EXEC DBMS_STATS.set_table_prefs('MYSCHEMA', 'MYTABLE', 'ESTIMATE_PERCENT', DBMS_STATS.AUTO_SAMPLE_SIZE);
And then execute the following:
EXEC DBMS_STATS.gather_table_stats('MYSCHEMA', 'MYTABLE',DEGREE=>4);
The stats gathering chugs along and after about 45 minutes it fails with: ERROR at line 1:
ORA-01652: unable to extend temp segment by 128 in tablespace TEMP ORA-06512: at "SYS.DBMS_STATS", line 18408 ORA-06512: at "SYS.DBMS_STATS", line 18429 ORA-06512: at line 1
I am still a newbie on stats for partitioned tables... Seems odds that a 15gb table requires so much (64gb) of temp while gathering. Not sure if I am hitting a bug. Metalink searches sent me on some wild goose chases. Any suggestions before I request a swath of disk space for more TEMP files appreciated as I have to get this worked out before I move on to the larger tables in this schema (50gb+).
-- Dave Mann www.brainio.us www.ba6.us - Database Stuff - http://www.ba6.us/rss.xml -- http://www.freelists.org/webpage/oracle-lReceived on Thu Mar 22 2012 - 10:12:00 CDT