Rich,
It depends... Is Fiscal_Year truly just the year, or is it a full Date
column?
If it's just the year, then an index would be of no benefit, since all rows
in each partition would have the same value. A query that included
..."Where Fiscal_Year = 1999" would hit the right partition because the
optimizer would recognize the partition key being referenced - no index
needed.
If Fiscal_Year is a Date column and queries include something like ..."Where
Fiscal_Year Between To_Date('19990713','YYYYMMDD')And
To_Date('19990714','YYYYMMDD')" then a local index would be useful. The
optimizer would point the query to the 1999 partition and the local index
would facilitate fetching the appropriate rows there.
Jack
--------------------------------
Jack C. Applewhite
Database Administrator/Developer
OCP Oracle8 DBA
iNetProfit, Inc.
Austin, Texas
www.iNetProfit.com
[EMAIL PROTECTED]
(512)327-9068
-----Original Message-----
Sent: Friday, July 13, 2001 12:31 PM
To: Multiple recipients of list ORACLE-L
Hi all,
So there I am, partitioning a 7M+ row table by FISCAL_YEAR. There is
currently an index on FISCAL_YEAR that I had planned to drop, but I can't
seem to find anything to back up my assumption that the index would no
longer be needed, and would in fact slow down access to the table. I've
done some explain plan comparisons that look good to me, but I'd like some
outside force to say "Yay", "Nay", or "RTFM in the Oracle yadda-yadda for
8.1.7".
Anyone?
Rich Jesse System/Database Administrator
[EMAIL PROTECTED] Quad/Tech International, Sussex, WI USA
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Author: Jack C. Applewhite
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