Poor performance when using skip-level hierarchies

Hi there,
currently we have big performance issues when drilling in a skip-level hierarchy (each drill takes around 10 seconds).
OBIEE is producing 4 physical SQL statements when drilling f.e. into the 4th level (for each level one SQL statement). The statements runs in parallel and are pretty fast (the database doesn't need more than 0,5 seconds to produce the result), but ... and here we have probably somewhere a problem ... putting all the 4 results together in OBIEE takes another 8 seconds.
This are not big datasets the database is returning - around 5-20 records for each select statement.
The question is: why does it take so long to put the data together on the server? Do we have to reconfigure some parameters to make it faster?
Please guide.
Regards,
Rafael

If you really and exclusively want to have "OBIEE can handle such queries" - i.e. not touch the database, then you had best put a clever caching strategy in place.
First angle of attack should be the database itself though. Best sit down with a data architect and/or your DBA to find the best setup possible physically and then when you've optimized that (with regard to the kind of queries emitted against it) you can move up to the OBIS. Always try t fix the issue as close to the source as possible.

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jimthompson wrote:
Hi, I have a Linux distribution ( Oracle Enterprise Linux 5.3 i.e. Redhat ) that I have installed. It works fine when I used 2*512Mb dimms or replace them with a single 1Gb dimm. However when I try to go above 1 Gb the bootup and general performance deteriorates badly. The BIOS picks up the memory changes ok and I am using the same type of memory sticks. It makes no difference if I load a single memory channel with the 2 sticks or balance the sticks over the 2 channels - I still get poor performance. When I return to 1Gb of RAM performance is great
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Kim Sarkin
[email protected]

Hi Kim,
Sorry I can't help out, but, I'm curious how you got the AS 2008 drivers installed for use with OBIEE? I have an AS2008 environment, but, my OBIEE version only supports 2000 and 2005.
Thanks,
Mark

Poor performance when using skip-level hierarchies

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