Gathering statistics on partitioned and non-partitioned tables

Hi all,
My DB is 11.1
I find that gathering statistics on partitioned tables are really slow.
TABLE_NAME                       NUM_ROWS     BLOCKS SAMPLE_SIZE LAST_ANALYZED PARTITIONED COMPRESSION
O_FCT_BP1                        112123170     843140    11212317 8/30/2011 3:5            NO                    DISABLED
LEON_123456                      112096060     521984    11209606 8/30/2011 4:2           NO                   ENABLED
O_FCT                           115170000     486556      115170 8/29/2011 6:3            YES
SQL> SELECT COUNT(*) FROM user_tab_subpartitions
2 WHERE table_name =O_FCT'
3 ;
COUNT(*)
       112I used the following script:
BEGIN
DBMS_STATS.GATHER_TABLE_STATS(ownname          => user,
                                tabname          => O_FCT',
                                method_opt       => 'for all columns size auto',
                                degree           => 4,
                                estimate_percent =>10,
                                granularity      => 'ALL',
                                cascade          => false);
END;
/It costs 2 mins for the first two tables to gather the statistics respectively, but more than 10 mins for the partitioned table.
The time of collecting statistics accounts for a large part of total batch time.
And most jobs of the batch are full load in which case all partitions and subpartitions will be affected and we can't just gather specified partitions.
Does anyone have some experiences on this subject? Thank you very much.
Best regards,
Leon
Edited by: user12064076 on Aug 30, 2011 1:45 AM

Hi Leon
Why don't you gather stats at partition level? If your partitions data is not going to change after a day (date range partition for ex), you can simply do at partition level
GRANULARITY=>'PARTITION' for partition level and
GRANULARITY=>'SUBPARTITION' for subpartition level
You are gathering global stats every time which you may not require.
Edited by: user12035575 on 30-Aug-2011 01:50

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