Query taking too long. Will Indexing help?

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I have 2 huge tables in my tables each with nearly 12lakhs rows. Product table and Member table.
I need to update a column ActionCd in Product table based on the column Code in Member table

If Product.Code = Member.Code, then Product.ActionCd = 'A'
If Product.Code != Member.Code, then Product.ActionCd = 'P'

I use the following query to update the table

UPDATE Product
SET ActionCd='A'
FROM Product p join Member m on p.Code = m.Code
WHERE p.ActionCd is null

But this query is taking too long to execute - more than an hour. It is because of the huge data in the 2 tables.
How can I reduce the time for the query execution?

I dont know much about indexing in sql. Will the use of indexing help me reduce the time? If so, please explain how to use indexing in this situation.

Thanks in advance.

Posted 6-Mar-13 23:31pm

SruthiR

Updated 6-Mar-13 23:51pm

v2

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phil.o 7-Mar-13 5:42am

If Product.Code = Member.Code, then Product.ActionCd = 'A'
If Product.Code = Member.Code, then Product.ActionCd = 'P'

Both these statements are mutually exclusive.

2 solutions

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Davidduraisamy · Answer 1 · 2013-03-06T23:34:00

Solution 1

No..Indexing will not reduce the time for updating.It will be helpfull for Searching that to for selecting.

Posted 6-Mar-13 23:34pm

Davidduraisamy

Comments

SruthiR 7-Mar-13 6:26am

thanks .. is there any way to reduce the time..

Srinivasan Vinayagam · Answer 2 · 2013-03-06T23:42:00

Solution 2

Try this query in testing server

It will reduce the update time

SQL

Update Product set actioncid='A'
from
(
SELECT code from Member
)tmp
where product.code=tmp.product
and product.actioncd is null

Posted 6-Mar-13 23:42pm

Srinivasan Vinayagam