Gather Stats on Newly Partitioned Table

Question

I partitioned an existing table containing 92 million rows. The method was using dbms_redefinition, whereby I started the redef and then added the indexes and constraints last. After partitioning, I did not gather stats on any of the partitions that were created and I did not analyze any of the indexes. Then I loaded an additional 4 million records into on of the partitions of the newly partitioned table. I ran dbms gather stats on this particular partition and it took over 15 hours. Normally it only takes 4 hours to run dbms gather stats on the individual partitions, so I stopped it after 15 hours. When I monitored it while it was running, it looked like it was taking a really long time gathering stats on the indexes. Is this normal for a newly partitioned table? Is there something I can to prevent it from taking so long when I run gather stats? Oracle Version 10.2.0.4

Answer 1

-- Gather PARTITION Statistics
SYS.DBMS_STATS.gather_table_stats(ownname => upper(v_table_owner), tabname => upper(v_table_name),
partname =>v_table_partition_name, estimate_percent => 20, cascade=> FALSE,granularity => 'PARTITION');
-- Gather GLOBAL INDEX Statistics
for i in (select * from sys.dba_indexes where table_owner = upper(v_table_owner)
and table_name = upper(v_table_name) and partitioned = 'NO'
order by index_name)
loop
SYS.DBMS_STATS.gather_index_stats(ownname => upper(v_table_owner), indname => i.index_name,
estimate_percent => 20, degree => NULL);
end loop;
-- Gather SUB-PARTITION Statistics
SYS.DBMS_STATS.gather_table_stats(ownname => upper(v_table_owner), tabname => upper(v_table_name),
partname =>v_table_subpartition_name, estimate_percent => 20, cascade=> TRUE,granularity => 'ALL');