Optimizing Pl/SQL procedure for fast execution

Hi All,
What are the tips that we must take care while writing pl/sql procedure or function, that it execute smoothly without any strains or resources.
And if any of the procedure or function is not running fast enough is there any DBMS package or something like EXPLAIN PLAN to see the execution path used by optimizer or to analyze the code in that procedure or function to establish what causing the problem ?
Any help will be highly appriciated.
Thanking you and best regards.

And if any of the procedure or function is not running fast enough is there any DBMS package or something like EXPLAIN PLAN to see the execution path used by optimizer or to analyze the code in that procedure or function to establish what causing the problem ?
Yes it is. :)
Read this:
http://download-uk.oracle.com/docs/cd/B14117_01/server.101/b10752/toc.htm
Peter D.

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Meher Irk wrote:
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Hello Everybody,
We are on Version
Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - 64bi
I am trying to get data from tab1 where col8 is equal to ' ' at the same time If we 2 or 3 records matched on col1 and col2 with different dates(col3) i am only interested in getting one record with the least date....
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12 1 17-JAN-13 1 5 7 9 1233333 25
10 2 16-JAN-13 2 5 7 9 1233333 25
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17 5 09-OCT-12 5 5 7 9 1233333 29
17 5 16-JAN-13 6 5 7 9 1233333 28
17 5 10-OCT-12 5 5 7 9 1233333 29
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10 2 14-JAN-13 2 5 7 9 1233333 25
16 6 09-OCT-12 5 5 7 9 1233333 29
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Select col1,col2,col3,col4,col5,col6,col7,col8,col9 from(Selct of.,row_number() over (partition by col1,col2 order by col3 asc) as rnk
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| 0 | SELECT STATEMENT | | 1016M| 118G| | 13M (2)| 45:46:43 | | |
|* 1 | VIEW | | 1016M| 118G| | 13M (2)| 45:46:43 | | |
|* 2 | WINDOW SORT PUSHED RANK| | 1016M| 43G| 64G| 13M (2)| 45:46:43 | | |
| 3 | PARTITION LIST SINGLE | | 1016M| 43G| | 1878K (3)| 06:15:47 | 4 | 4 |
| 4 | TABLE ACCESS FULL | TAB1 | 1016M| 43G| | 1878K (3)| 06:15:47 | 4 | 4 |
Predicate Information (identified by operation id):
1 - filter("RNK"=1)
2 - filter(ROW_NUMBER() OVER ( PARTITION BY "COL1","COl2" ORDER BY "COl3")<=1)
17 rows selected
Thanks In Advance!
Edited by: 983949 on Jan 24, 2013 11:50 AM

983949 wrote:
Hello Everybody,
I am trying to get data from tab1 where col8 is equal to ' ' at the same time.
If we 2 or 3 records matched on col1 and col2 with different dates(col3)
i am only interested in getting one record with the least date...
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and i am trying to see if there is an effecient way of writing this....we have an index on COL3.
Select col1,col2,col3,col4,col5,col6,col7,col8,col9
from(Selct of.*,row_number() over (partition by col1,col2 order by col3 asc) as rnk
from tabl of where of.col8 = '1233333') where rnk = 1
Thanks In Advance!How do I ask a question on the forums?
SQL and PL/SQL FAQ

Stored Procedures for Simple SQL statements

Hi Guys,
We are using Oracle 10g database and Web logic for frontend.
The Product is previously developed in DotNet and SQL Server and now its going to develop into Java (Web Logic) and Oracle 10g database.
Since the project is developed in SQL Server, there are lot many procedures written for simple sql queries. Now I would like to gather your suggestions / pointers on using procedures for simple select statements or Inserts from Java.
I have gathered some list for using PL/SQL procedure for simple select queries like
Cons
If we use procedures for select statements there are lot many Ref Cursors opened for Simple select statements (Open cursors at huge rate)
Simple select statements are much faster than executing them from Procedure
Pros
Code changes for modifying select query in PL/SQL much easier than in Java
Your help in this regard is more valuable. Please post your points / thoughts here.
Thanks & Regards
Srinivas
Edited by: Srinivas_Reddy on Dec 1, 2009 4:52 PM

Srinivas_Reddy wrote:
Cons
If we use procedures for select statements there are lot many Ref Cursors opened for Simple select statements (Open cursors at huge rate)No entirely correct. All SQLs that hit the SQL engine are stored as cursors.
On the client side, you have an interface that deals with this SQL cursor. It can be a Java class, a Delphi dataset, or a PL/SQL refcursor.
Yes, cursors are created/opened at a huge rate by the SQL engine. But is is capable of doing that. What you need to do to facilitate that is send it SQLs that uses bind variables. This enables the SQL engine to simply re-use the existing cursor for that SQL.
Simple select statements are much faster than executing them from ProcedureAlso not really correct. SQL performance is SQL performance. It has nothing to do with how you create the SQL on the client side and what client interface you use. The SQL engine does not care whether you use a PL/SQL ref cursor or a Java class as your client interface. That does not change the SQL engine's performance.
Yes, this can change the performance on the client side. But that is entirely in the hands of the developer and how the developer selected to use the available client interfaces to interface with the SQL cursor in the SQL engine.
Pros
Code changes for modifying select query in PL/SQL much easier than in JavaThis is not a pro merely for ref cursors, but using PL/SQL as the abstraction layer for the data model implemented, and having it provide a "business function" interface to clients, instead of having the clients dealing with the complexities of the data model and SQL.
I would seriously consider ref cursors in your environment. With PL/SQL servicing as the interface, there is a single place to tune SQL, and a single place to update SQL. It allows one to make data model changes without changing or even recompiling the client. It allows one to add new business logical and processing rules, again without having to touch the client.

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> Hi TOM,
This is not asktom.oracle.com.
> Can Possible to do in Oacle Pl/Sql...?
Yes it can be done. Simply consult the applicable manuals that contains all of the details on how to do it. The manuals are:
- Oracle® Database Application Developer's Guide - Large Objects (refer to Chapter 6 section on Using PL/SQL (DBMS_LOB Package) to Work with LOBs)
- Oracle® Database PL/SQL Packages and Types Reference (refer to the chapter on DBMS_LOB)

Optimizing Pl/SQL procedure for fast execution

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