Database growth following index key compression in Oracle 11g

Hi,
We have recently implemented index key compression in our sap R3 environments, but unexpectedly this has not resulted in any reduction of index growth rates.
What I mean by this is that while the indexes have compressed on average 3 fold (over the entire DB), we are not seeing this with the DB growth going forward.
ie We were experiencing ~15GB/month growth in our database prior to compression, but this figure doesnt seem to have changed much in the 2-3months that we have implemented in our production environments.
Our trial with ACO compression seemed to yield reduction of table growth rates that corresponded to the compression ratio (ie table data growth rates dropped to a third after compression), but we havent seen this with index compression.
Does anyone know if a rebuild with index key compression will it compress any future records inserted into the tables once compression is enabled (as I assumed) or does it only compress whats there already?
Cheers
Theo

Hello Theo,
Does anyone know if a rebuild with index key compression will it compress any future records inserted into the tables once compression is enabled (as I assumed) or does it only compress whats there already?
I wrote a blog about index key compression internals long time ago ([Oracle] Index key compression), but now i noticed that one important statement is missing. Yes future entries are compressed too - index key compression is a "live compression" feature.
We were experiencing ~15GB/month growth in our database prior to compression, but this figure doesnt seem to have changed much in the 2-3months that we have implemented in our production environments.
Do you mean that your DB size still increases ~15GB per month overall or just the index segments? Depending on the segment type growth - maybe indexes are only a small part of your system at all.
If you have enabled compression and perform a reorg of them, you can run into one-time effects like 50/50 block splits due to fully packed blocks, etc. It also depends on the way the data is inserted/updated and which indexes are compressed.
Regards
Stefan

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Edited by: Naveen Kumar C on Mar 18, 2011 9:10 PM
Edited by: Naveen Kumar C on Mar 18, 2011 11:44 PM

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Hi;
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3 compress for all operations
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Hi,
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COMPRESS FOR OLTP
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COMPRESS FOR DIRECT_LOAD OPERATIONS (deprecated)
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2 nologging
3 compress for oltp
4 as
5 select * from all_objects ;
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4 as
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Hi All,
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user10934487 wrote:
Hi,
Any one done a upgrade of oracle 9.2.0.5 to 11g R2 ?
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http://www.oracle.com/technology/products/database/oracle11g/upgrade/presentations/9i_to_11g_real_world_customer_experience.pdf
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user11000521 wrote:
Hi guys,
I need a bit of advice on which course should I follow. I know that Oracle 11g is the latest release and it composes of new features compared to 10g, but I need to know the which is worth doing is 10g or 11g.
-Coz I heard that oracle 11g still runs on beta versions and the revised version has not been released.
-The demand and the market base for both of them, coz far as I know one of my neighbour who is a dba he said
oracle 10g has around 80% of the market share whilst 11g has only around 15%.
-And also guys the exam paper itself coz 10g has a duration of 90 mins and 11g comprises of 3-3.5 hours paper
which most likely means that the paper might be difficult.
I am new to this field and I am not quite sure which exam I should write, so need some clarification,,,,
Thanks in advance for your replies...Just in addition to Hans and Bigdelboy's replies, first thing , `11g is NOT in beta. 11g R1(11106) release officially came in 2007 July and was launched completely for commercial use. As Hans pointed, release 2 of 11g is currently in beta but as per the "rumours" , this also should end soon. So you must throw this out from the mind that 11g is running in beta. Its very well out and its amazingly very well accepted in the industry.
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Just few thoughts!
HTH
Aman....
Edited by: Aman.... on Apr 26, 2009 9:37 AM
replaced a word with another

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exp system/******* file=/exportdb/fulldb.dmp log=/exportdb/fulldb.log full=y
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Processing object type DATABASE_EXPORT/PROFILE
Processing object type DATABASE_EXPORT/SYS_USER/USER
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Processing object type DATABASE_EXPORT/ROLE
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Processing object type DATABASE_EXPORT/SCHEMA/GRANT/SYSTEM_GRANT
Processing object type DATABASE_EXPORT/SCHEMA/ROLE_GRANT
Processing object type DATABASE_EXPORT/SCHEMA/DEFAULT_ROLE
Processing object type DATABASE_EXPORT/SCHEMA/TABLESPACE_QUOTA
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Processing object type DATABASE_EXPORT/TRUSTED_DB_LINK
Processing object type DATABASE_EXPORT/SCHEMA/SEQUENCE/SEQUENCE
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Processing object type DATABASE_EXPORT/DIRECTORY/DIRECTORY
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Processing object type DATABASE_EXPORT/SCHEMA/TYPE/GRANT/OWNER_GRANT/OBJECT_GRANT
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Database growth following index key compression in Oracle 11g

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