Gather table stats after shrink?

Question

Hello,
do I need (or is it useful) to run dbms_stats.gather_table_stats after table shrink or does oracle update statistics automatically?
Regards,
Arndt

Answer 1

Hi,
I'd suggest you to write some script to run it from crontab to gather statistics automaticaly.
You can do the same via Enterprise Manager scheduling it on daily/hourly basis you wish.
select 'Gather Schema Stats' from dual;
select 'Started: '|| to_char(sysdate, 'DD-MM-YYYY HH24:MI:SS') from dual;
-- exec dbms_stats.gather_schema_stats('<my_schema>');
select '- for all columns size auto' from dual;
exec DBMS_STATS.gather_schema_stats(ownname => '<my_schema>', estimate_percent => DBMS_STATS.AUTO_SAMPLE_SIZE, method_opt => 'FOR ALL COLUMNS SIZE AUTO', degree => DBMS_STATS.AUTO_DEGREE, cascade => true, force => true);
select '- for all indexed columns size skewonly' from dual;
exec  DBMS_STATS.gather_schema_stats(ownname => '<my_schema>', estimate_percent => DBMS_STATS.AUTO_SAMPLE_SIZE, method_opt => 'FOR ALL INDEXED COLUMNS SIZE SKEWONLY', degree => DBMS_STATS.AUTO_DEGREE, cascade => true, force => true);
select 'Finished: '|| to_char(sysdate, 'DD-MM-YYYY HH24:MI:SS') from dual;Good luck!
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