Answer / shailesh

We can improve the performance by create indexes on the use
tables which is used in the procedure,function and packages
And with the help of these indexes we can improve the
performance.

Answer / kapil

By using index (not always)
by using bulk fetch
by using exists and not exists in place of in and not in
clause.
by avoiding implicit conversion by oracle
ex: if in employee table emp_no is varchar then
if we query the data from employee table by
where cluase like employee_number = 123 then oracle will
have to implictly convert the number 123 to
varhcar '123'and will require time

Answer / hrishi

To reduce the context switches between the SQL Engine and
PL/SQL engine. We can use Bulk Bind Concept to this...

Answer / 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

Answer / shakir

keeping the pl/sql blocks in keep pool in sga that is
called pinning of packages

Answer / dipti

By using Indexs we can improve the performace,
also use exist and not exist in place of in and not in as
it plays the same role as Index.

Answer / anand reddy

1)by using index
2)by using bulk collect
3)by using exist operator
4)by using hints
5)by using nocopy option
6)by using collection types

Answer / rutujagabhane

SELECT *
FROM employees
ORDER BY EMPLOYEE_ID
OFFSET 99 ROWS
FETCH NEXT 21 ROWS ONLY;

Answer / syam

Hi Shailesh,


let me know that how can i improve performence of
procedures by useing indexes

Answer / debasis bose

Using Views, instate of multiple tables.

What is clustered and non-clustered indexes?

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