RE: Full table scan difference

From: DENNIS WILLIAMS <DWILLIAMS_at_LIFETOUCH.COM>
Date: Fri, 04 Apr 2003 17:13:37 -0800
Message-ID: <F001.0057B29A.20030404171337@fatcity.com>

Cary, Denny - Thanks very much. I was running out of ideas on a Friday afternoon, then I just ran out. Have a good weekend, will try these suggestions Monday.

Dennis Williams
DBA, 40%OCP, 100% DBA
Lifetouch, Inc.
dwilliams_at_lifetouch.com

-----Original Message-----
Sent: Friday, April 04, 2003 3:54 PM
To: Multiple recipients of list ORACLE-L

1. Dial 1-0-0-4-6.
2. Look at the latching and pinning statistics promoted at asktom, ixora, and jlcomp.

Cary Millsap
Hotsos Enterprises, Ltd.
http://www.hotsos.com

Upcoming events:

- Hotsos Clinic 101 in Chicago, London, Reykjavik, Ottawa, Denver
- Visit www.hotsos.com for schedule details...
- IOUG-A Live 2003, Orlando, 10am Monday 28 April: "Oracle Operational

Timing Data"

-----Original Message-----
WILLIAMS
Sent: Friday, April 04, 2003 2:49 PM
To: Multiple recipients of list ORACLE-L

List - As I mentioned earlier, a new manager came from a site that regularly rebuilt tables. I protested the value of this, but his response was "well, at least you could test it." So on a test instance I've been doing a CTAS to create a reorganized copy of the table in the same tablespace (LMT with uniform extents, autoextend on). As expected, the number of blocks is very close.

   Then I've been doing a FTS (select count(*)) on both tables. Usually the time is very close. However, on one large table, the original is much faster
-- 18-sec. vs. 27-sec. 21,349 blocks vs. 21179. Same plan. Does anyone have
a theory for this discrepancy?

Dennis Williams
DBA, 40%OCP, 100% DBA
Lifetouch, Inc.
dwilliams_at_lifetouch.com
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Author: DENNIS WILLIAMS
  INET: DWILLIAMS_at_LIFETOUCH.COM

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Author: Cary Millsap
  INET: cary.millsap_at_hotsos.com

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Author: DENNIS WILLIAMS
  INET: DWILLIAMS_at_LIFETOUCH.COM

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San Diego, California        -- Mailing list and web hosting services
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To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). Received on Fri Apr 04 2003 - 19:13:37 CST