Need an idea about performance ..

I want to know as whether filtering more in a query increases performance of a query or decreases it ..
Actually i executed a query which taken 5 mins around and so i did some filterings taking a point in a mind as filtering will not access whole table as just whichever are matching records, it will fetch that quickly but its opposite happened as now its taking around 7 mins..
For increasing performance as i am aware i removed order by clause too as sorting takes more cost ..
Now can anyone let me know just as whether writing more join statements it increases performance or decreases it ...
Cost is decreased from 280103 to 36387 but still execution time is not improved and in fact it became more bad ..
So any one help me .. Its any valuable links .. As i already did some searching but didnt find suitable one's ..
Regards..

180589 wrote:
I want to know as whether filtering more in a query increases performance of a query or decreases it .. Cant say, it depends. It depends on the access plan. If you use WHERE clause and if oracle goes for a full table scan then the time is going to be the same.
Actually i executed a query which taken 5 mins around and so i did some filterings taking a point in a mind as filtering will not access whole table as just whichever are matching records, Wrong Oracle need to go through each record to make sure its picking all the matching rows.
Now can anyone let me know just as whether writing more join statements it increases performance or decreases it ... You join tables for a specific requirement. How can you compare a query with table joins and another without any joins. They are two different queries doing two different things.
Cost is decreased from 280103 to 36387 but still execution time is not improved and in fact it became more bad .. You cannot compare the cost of two different query. Never do that.
So any one help me .. Its any valuable links .. As i already did some searching but didnt find suitable one's .. Performance tuning must be handled as case in hand. We cant give generic suggestions. So i would suggest you read {message:id=9360003} and follow the instructions give there.

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