What to do if data grows heavily.How to decrease the execution time

Procedure execution time increases from 1 minute to 40 minutes in the past three years. I think this is due to increase in size of tables. We are maintaining the database from last 6years. Nearly 25,000 records are adding per month in a table. Now each contains above 12Lakh records. I already used Query Optimization techniques. So please suggest me what to do.

So, does this process need to access the whole table or is it just interested in the last months records?
I already used Query Optimization techniques.meaning what precisely???
So please suggest me what to do.Without knowing a whole bunch more about your situation we cannot give you a solution. You have one slow process. So what? For instance, let's presume this is a batch process that runs once a month. Does a forty minute elapsed time matter compare to processes that are used by all your users many times every day? Are you prepared to risk the performance of those OLTP functions to improve the runtime of that batch process?
Cheers, APC

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What to do if data grows heavily.How to decrease the execution time

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