Tuesday, July 4, 2017
PLSQL Performance Tuning – NOT NULL Constraint
In
this post, I tried to explain the importance of constraint “NOT NULL” from
performance perspective.
From SQL Perspective:
- It adds semantic meaning to your data model. You KNOW that the column will always contain a value.
- It removes ambiguity.
- The more information you give the database, the better the quality of the plans. Not null impacts the optimizer, query rewrite, even the queries you must type in to get the correct answer.
- It improves Query Performance
From PLSQL Perspective: Its
better to use “NOT NULL” has a slight edge towards performance. The below demonstration will explain the same.
Demonstration:
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