Decrease Datafile Dimension

Hi experts.
I'm using ORACLE 10g and Enterprise manager. I need to decrease a datafile dimension (4,5 GB) to 600 MB. For normal extent it's ok.... but decreasing datafile can give me some problem. I need a coalesce? or coalescing is automatically done when i change dimension in Enterprise Manager?
What can i do for decrease datafile space?
Thanks!

ok, i'm trying this pocedure that seems to work:
alter table SYS.WRH$_OPTIMIZER_ENV move tablespace SYSAUX;
Then, Its index will be invalid, so i must do:
alter index SYS.WRH$_OPTIMIZER_ENV_PK rebuild tablespace SYSAUX online;
But i receive this error:
ERROR at line 1:
ORA-00604: error occurred at recursive SQL level 1
ORA-01502: index 'SYS.WRH$_OPTIMIZER_ENV_PK' or partition of such index is
in unusable state
I've tried to drop, rebuild the index but there's always an error:
ERROR at line 1:
ORA-02429: cannot drop index used for enforcement of unique/primary key

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Trouble while decreasing Datafile Size?

Hi Dears,
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This error appears cause Oracle choose by himself where he writes the datas in the file and in your case, it seems that he wrote it "at the end" of the datafile so you cant deacrease its size.
Drop/Create the tablespace will solve your problem
Fred

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It is a very nice script.
But it does not deal with something that appears to be being 'pushed' by some contributors (OK, one, really) to this forum as a suitable 'fix' for some performance problems: using multiple block sizes in one database. It's not surprising the script doesn't deal with this, though, because Tom Kyte has never particularly approved of using multiple blocksizes like that.
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[svn:osmf:] 9861: Fixing bug where sizing pixel from the previous run of updateIntrinsicDimensions would prevent the dimensions from being decreased .

Revision: 9861
Author:   [email protected]
Date:     2009-08-31 23:08:03 -0700 (Mon, 31 Aug 2009)
Log Message:
Fixing bug where sizing pixel from the previous run of updateIntrinsicDimensions would prevent the dimensions from being decreased.
Modified Paths:
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Decrease Datafile Dimension

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