Generic query on documenting and maintaining schema changes -Oracle 10g

Hi All,
This is a generic query and i was not getting any particular forum here to put this for suggestions and help.i have put this in the documentation forum also but havent got any inputs.
Could you all please advise a good and easy way I can store all db related stuff including every detail and minutest change done.
I work as a Oracle-DB developer and it has been particularly difficult to keep track the changes very much.
We have a Development pipeline(a code base for development),Testing pipeline(another code base-for Testing)
and then comes Production Deployment(another one for clients)
Presently,we have all our DDL,SQL,etc everything scripts stored in a sort of shared location but keeping them updated with every change done
in any of the above pipelines is very difficult and I end up finding discrepencies between the stored versions and what is in Testing and Production.
I typically spend a good deal of time doing comparing the entire scripts,schema changes to try to figure out what the right and latest version of a script should be.
So,need your inputs on any particular free tool,best practises and good process for tracking easily and also maintaining db changes.
--Thanks
Dev

The problem with most configuration management systems is that they were made for files, not database objects. Files such as dlls get replaced by the new version upon deployment, but database tables do not. Tables get upgraded with alter scripts. So if you want to maintain create table scripts, you need to upgrade them with every change, as well as creating alter table scripts.
For a free configuration management system, see http://subversion.tigris.org/. Such software will also do file comparisons including version comparison.
For comparing installation scripts to existing schemas, I would create a new schema with the installation script and then compare that new schema to an existing schema using the schema comparison feature in Toad or PLSQL Developer.
Alternately, you can forget about maintaining installation scripts and just take an export without data from your production or test schema whenever you need to create a new installation. You can also extract DDL from prod using the dbms_metadata package. Embarcadero Rapid SQL was also good for extracting DDL.

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SQL*Plus: Release 10.2.0.1.0 - Production on Sat Mar 11 21:46:54 2006
Copyright (c) 1982, 2005, Oracle. All rights reserved.
Connected to:
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Export: Release 10.2.0.1.0 - Production on Sat Mar 11 21:48:34 2006
Copyright (c) 1982, 2005, Oracle. All rights reserved.
Connected to: Oracle Database 10g Express Edition Release 10.2.0.1.0 - Production
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About to export specified users ...
. exporting pre-schema procedural objects and actions
. exporting foreign function library names for user TEST_MOVE
. exporting PUBLIC type synonyms
. exporting private type synonyms
. exporting object type definitions for user TEST_MOVE
About to export TEST_MOVE's objects ...
. exporting database links
. exporting sequence numbers
. exporting cluster definitions
. about to export TEST_MOVE's tables via Conventional Path ...
. . exporting table                           TEST          1 rows exported
. exporting synonyms
. exporting views
. exporting stored procedures
. exporting operators
. exporting referential integrity constraints
. exporting triggers
. exporting indextypes
. exporting bitmap, functional and extensible indexes
. exporting posttables actions
. exporting materialized views
. exporting snapshot logs
. exporting job queues
. exporting refresh groups and children
. exporting dimensions
. exporting post-schema procedural objects and actions
. exporting statistics
Export terminated successfully without warnings.
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Copyright (c) 1982, 2005, Oracle. All rights reserved.
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Copyright (c) 1982, 2005, Oracle. All rights reserved.
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Rem NAME
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Rem    glumpkin   10/21/92 - Renamed from SQLBLD.SQL
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rem
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rem
SET TERMOUT OFF
SET ECHO OFF
rem CONGDON    Invoked in RDBMS at build time.     29-DEC-1988
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INSERT INTO EMP VALUES
(7698,'BLAKE','MANAGER',7839,to_date('1-5-1981','dd-mm-yyyy'),2850,NULL,30);
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INSERT INTO SALGRADE VALUES (2,1201,1400);
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