Which way is better and why?
Hi allI have a table named DOC_DETAILS in which annual is NUMBER and primary key and DOC_TYPE is a type VARCHAR2 (20) and a nullable column. This table contains 40 columns altogether and have about 45 000 records. This table was used heavily in the application and now we are to avoid to display one of the doc_type (say 'DELIVERY') data to the front end application, although this type exists in the database.
For this I intend to create a non-unique index on this column and then I here are two options with me. Please suggest me which option is preferable in terms of performance. Please consider that this table has been used widely in many procedures and views.
Option 1:
======
I can create new view as below and replace the doc_details of table name with that name from view in all areas of the application.
CREATE or REPLACE FORCE VIEWS doc_details_vw
AS
SELECT *.
OF doc_details
WHERE doc_type! = "DELIVERY."
Option 2:
======
Open each procedure and see in which doc_details table is used and add below where appropriate at the end clause of the where clause.
doc_type! = ' DELIVERY
Please suggest me which option is best in performance wise. If code maintenance wise Option 1 is better, I'm trying to figure out which option is better in terms of performance.
Thanks for reminding me on version. Here it is:
Oracle Database 10 g Enterprise Edition Release 10.2.0.3.0 - 64 bit
Thank you.
Published by: TechMahi.com on September 8, 2010 12:22 AM
Hello
In terms of maintainability option 1 is better than if there are other conditions that can occur at a later point in time, that you can include in the view.
If you are concerned with performance, then by replacing in the places where you use the table will be advised, in case of an increase in the volume of data the views and the query using views can degrade performance.
Tags: Database
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