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Using Database Indices Effectively in JAVA

Posted on 2008-06-12
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Last Modified: 2010-03-30
Hi Experts,

My application is built in Java and the back-end is Oracle Rally installed in a Thin Server. To maximize the performance, the Database is being indexed now.

I got little information from the DBA. He says it uses Sorted indices for range retrieval and hashed for direct look-up. He has also provided me the following information about the indices.

INSURED_INFO_0400_SORTED        with column WIP_NUMBER
                                and column LAST_NAME
                                and column MIDDLE_NAME
                                and column FIRST_NAME
                                and column SSN
                                and column BIRTH_DATE
 

INSURED_INFO_HASH               with column WIP_NUMBER
        in INSURED_INFO_AREA
*********This index is a placement index clustered with the data*************

INSURED_INFO_HASH_SSN           with column SSN
                                and column WIP_NUMBER
                                and column INSURED_SEQUENCE_CODE

 
INSURED_INFO_SORTED_001         with column LAST_NAME
                                and column FIRST_NAME
                                and column WIP_NUMBER


I would like to know, how effectively and efficiently we could make use of the indices in the Java application.

Please advice.

Thanks & Regards,
Madhu Manikandan, R
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Question by:CIPL-Senthil
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3 Comments
 
LVL 25

Expert Comment

by:Tomas Helgi Johannsson
ID: 21780070
     Hi!

If you want Oracle to use the indexes you create a sql query
where the columns of the indexes are used as the matching columns
in where clause of the sql query.

If Oracle ( or any other database) cannot match the sql where clause columns
to a index column it will use table scan instead of index scan.

Regards,
  Tomas Helgi
0
 

Author Comment

by:CIPL-Senthil
ID: 21784057
Our backend is ORACLE RALLY [OLD VERSION]. I would like to know whether the indices created in oracle rally could be used effectively in JAVA. If so, could you please provide an example?
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LVL 25

Accepted Solution

by:
Tomas Helgi Johannsson earned 1500 total points
ID: 21784748
     Hi!

It should not matter what version of Oracle or what database it is as long as the indexes match
the where clause columns as I said before.

Regards.
   Tomas Helgi
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