How to do SAP Buffer Tuning

Hi Gurus!
We having performance problem on some tcode lately (we are using sap R/3 4.7 on Windows - 2003 Server & our database is Oracle - 9i )
Can anybody give me an advice or link to sap notes or the other article or guide how to perform sap buffer tuning, and optimizing instance parameter ?
Thank you in advance.
Regards,
Shishir

Task 1 :
Check for tables which are not buffered, but should be.
For example, check the customers:
          Customising tables, (table names beginning with Y or Z)
          Condition tables (for example, table A<nnn>, where nnn 500 to 999
Task 2 :
Check for tables which are buffered, but should not be.
    For example, check large and frequently changed Customising
    tables, such as:
    Table TCURR (exchange rates)
    Tables A005 (prices), A017 (customer/material), and A018 (vendor/material)
In the Online Service System (OSS), see also, for example, R/3 Notes 23877, 91335, and 34910

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제품 : ORACLE SERVER
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