At 10:05 AM 5/29/2003 -0800, you wrote:
Hi John,
Yes, monitoring was set. I wouldn't see anything in *tab_modifications if monitoring wasn't set.
Here's a new twist. What percentage are you comfortable with for valid estimates? I attended a seminar given by Jonathan Lewis a few weeks ago, and he stated that adequate statistics can be gathered using 1% sample. That was great news to me, who has time for huge estimates? OK, so I ran dbms_stats.gather_schema_stats using GATHER EMPTY and estimate_percent set to 1. The rowcounts are way wrong.
(FACP-LISA)>SELECT COUNT(*) 2 FROM VEGAS_MART 3 PARTITION (MAY_28_2003);
COUNT(*) ---------- 603826
(FACP-LISA)>select num_rows 2 from dba_tab_partitions 3 where table_name = 'VEGAS_MART' 4 and partition_name = 'MAY_28_2003';
NUM_ROWS ---------- 595500
(FACP-LISA)>
And Jonathan if you happen to read this email, if I am mis-stating what you stated in class please correct me. I am on 8.1.7.4 and that may be the difference.
Wolfgang Breitling Oracle7, 8, 8i, 9i OCP DBA Centrex Consulting Corporation http://www.centrexcc.com
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