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Message Posted: Mon, 04 Mar 2002 @ 17:15:14 GMT


     
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Subj:   Re: COLLECT STATISTICS on DBC
 
From:   David A. Hough

Collect statistics on older systems took a table level lock for the duration of the collect operation. On DBC this is BAD because of all the processes that will block while the table is locked. Example: many tables are accessed during login, a locked table means no logins. If you're going to collect statistics on DBC, pick your time carefully.

Newer systems have a different locking mechanism that takes the lock only at the end of the statistics collection. I'd defer any DBC collect statistics operations until I was on the appropriate level. NCR folks: was it 4.0 or 4.1 where this change came in?

david hough



     
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