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Home -> Community -> Mailing Lists -> Oracle-L -> RE: Partitioning
Dennis
What are you trying to achieve by partitioning? Generally I've seen two common goals, 1) break a large table into more manageable pieces, 2) performance tuning, so a query only has to scan a small partition. Sometimes the two can be achieved simultaneously, sometimes they are at odds. If you had a year column, and partitioned on that column, you might have manageability, but if none of your queries included that column, Oracle would probably do a full table scan on all partitions (maybe in parallel if you have the partitions on separate devices). On the other hand, I've partitioned a table by week, which produces 52 partitions for each year. Not good for manageability, but it made the queries blazingly fast.
Dennis Williams
DBA, 80%OCP, 100% DBA
Lifetouch, Inc.
dwilliams_at_lifetouch.com
-----Original Message-----
Sent: Tuesday, August 12, 2003 11:04 AM
To: Multiple recipients of list ORACLE-L
I have worked with partitioning before but have yet encountered the
following challenge -
The table we are trying to partition is a large table with hundreds of
millions of rows, which is ok. But it does not have a month column, although
it has dates. I would like to partition by month because this table contains
years of data and partitioning by days will result in thousands of
partitions. Of course we can add a month column but I think that will
require extensive downtime which we can't afford and I suspect it will cause
row-chaining as well. So anybody care to share with me any other
options/suggestions?
TIA Dennis
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Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services ---------------------------------------------------------------------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).
Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services ---------------------------------------------------------------------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 Tue Aug 12 2003 - 16:19:24 CDT
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