Indexing partition key
- From: amonte <ax.mount@xxxxxxxxx>
- To: Oracle-L Group <oracle-l@xxxxxxxxxxxxx>
- Date: Fri, 10 Sep 2010 18:52:36 +0200
Hi all
I have a data warehouse running in 11.1.0.7.
There is a fact tables with 3000 million of rows range partitioned at
entered_date per hour, entered_date is also indexed (btree index). This is
giving some performance headaches because many queries are so simple as
select .....
from fact_table1
where entered_date >= to_date(......)
and entered_date > to_date(......)
The range can go from 1 hour to 7 days. The problem is that instead of
scanning partitions (full scans) it uses index range scan and to check 9
hour data instead of taking around 20 seconds (using no_index hint) it takes
2 hours.
This is not the first time I have seen this issue, I am almost certian that
index on the partition key does not help in this case. Shall I drop the
index?
TIA
Alex
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