DAC parameter setting.

Hi All,
Can anyone explain how DAC sets informatica parameter file(internally).
Lets say for ex, if ETL was run for 2 tables on separate days, then the $$LAST_EXTRACT_DATE will be different for these 2 tables.
Where does DAC store this information? and how does it pass it to informatica.
Is there any document on internal architecture of DAC.
And information on DAC repository tables?
(the way i have worded my post here might seem naive to many of you. Kindly excuse since im new to DAC)
Thanks in advance

start with this document
Oracle® Business Intelligence
Data Warehouse Administration Console User’s Guide
Version 10.1.3.4
E12652-01

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null

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null

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user8211187 wrote:
We have a new application going live, hence a new database instance need to be set. The oracle version is 10.2.0.5 (exisiting env. constraint)
The load testing is conducted for approx. 2000 user load. As per the test results, during the peak load, number of database sessions opened are 450. The expected user load is 5500 in production, hence we are expecting approx 1100 database sessions at that time.
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