Stored Procedure vs SQL query

1] What is the reason for mostly using Procedure instead of sql and main use?
2] How to increase the procedure speed?

> 1] What is the reason for mostly using Procedure instead of sql and main use?
The rule which I often repeat around here (sometimes a couple of times per day):
Maximise SQL. Minimise PL/SQL
In other words, only when the logic is too complex to be dobe efficiently and effectively in SQL, then PL/SQL is used. BUT PL/SQL IS ONLY USED WHEN SQL CANNOT DO THE JOB.
Why? SQL is not what they call a "Turing Complete" language. It is limited in the constructs and logic processing it can do. PL/SQL is otoh a 4GL language (based on the 3GL called Ada). It is "Turing Complete" and can do the complex funky walk.
> How to increase the procedure speed?
By maximising SQL. Treating Oracle data as data sets and not perform row-by-row processing.
Using bulk processing.
By adhering to fundamentals of software engineering.
By reading the Oracle® Database Application Developer's Guide - Fundamentals and applying these.
By reading the Oracle® Database Concepts guide and understanding these concepts.
Oh yeah - the URLs for the docs:
http://download-east.oracle.com/docs/cd/B19306_01/appdev.102/b14251/toc.htm
http://download-east.oracle.com/docs/cd/B19306_01/server.102/b14220/toc.htm

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