Function Purity Level

Function Purity Level
The function purity level defines what structures the function reads or modifies.Purity levels
WNDS - Writes No Database State i.e. Function does not modify any database tables (No DML)
RNDS - Reads No Database State i.e. Function does not read any tables (No select)
WNPS - Writes No Package State i.e. Function does not modify any packaged variables (packaged variables are variables declared in a package specification)
RNPS - Reads No Package State i.e. Function does not read any packaged variables
Syntax:
PRAGMA RESTRICT_REFERENCES (function_name, WNDS [, WNPS] [, RNDS] [, RNPS])Tells the compiler the purity level you believe your function meets or exceeds

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Subquery Factoring

Subquery Factoring
Subquery factoring, also known as the WITH clause, provides a convenient and flexible way to define subquries and in-line views. The primary purpose of subquery factoring is to reduce repeated table accesses by generating temporary data sets during subquery execution.

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Difference between Post database commit and Post-form commit

Difference between Post database commit and Post-form commit
Post-form commit fires once during the post and commit transactions process, after the database commit occurs. The post-form commit trigger fires after inserts, updates and deletes have been posted to the database but before the transactions have been finalized in, issuing the command. The Post-database commit trigger fires after oracle forms issues the commit to finalized transactions.

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altering user

SQL> ALTER USER username ACCOUNT LOCK;SQL> ALTER USER username ACCOUNT UNLOCK;To change the password for a user:SQL> alter user username identified by new_password;All at once:
-- Expire, forces to change the password at first loginSQL> alter user username identified by password account lock password expire;

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