How to improve the performance of a pl/sq stored procedures
or functions or triggers and packages ?
Answer Posted / rajnish chauhan
Follow the steps for performance SQL Tunning.
1) First of all tables structure should be in normalization form.
2) Then Index and tables Statistics should be upto date.
3) make it different tables table space for tables and index.
4) Avoid unnecessary joins from the query.
5) Avoid Full Table Scan and Index Skip scan.if query fetching less then 15% records from the table then index scan faster then FTS.and FTS is better then index scan if tables consist larg no of data because Index scan read multiple time on each row where as FTS read single time for each row.
6)monitor Plan through Explain plan or TKPROFF.
7)Table ordering also improve the performance of the query like.Master table should take first place then after Transaction table.
8) Check index path used or not in explain plan .if not then check weather index enable or not.then use Index Hint to forcefully used.
9)Avoid function on index column.
10) other small things you can apply like use Having instead of Where clause , use Exists then IN , use Substring instead of <> caluse.
Thanks
Is This Answer Correct ? | 2 Yes | 0 No |
Post New Answer View All Answers
What is pl/sql table? Why it is used?
What is the main difference between sql and pl/sql?
what is a relationship and what are they? : Sql dba
What is trigger in sql and its types?
how to write date and time literals? : Sql dba
What is exception? What are the types of exceptions?
How do I write a sql query in pgadmin 4?
How do I run a sql trace?
What is the plv (pl/vision) package offers?
Will truncate release space?
what is meant by nl2br()? : Sql dba
What is the difference between partitioning and sharding?
Is it important to partition hard disk?
What is a join?
How many types of indexes are there in sql?