as per query that well parameterized and again index seek 50 %.. please explain me?
Well, the cost has to be somewhere. Percentages have to add to 100% or they're meaningless, so something has to have a non-zero cost percentage.
Is the query still a problem? If no, go find a query that is a problem and worry about that query.
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)SQL In The Wild
: Discussions on DB performance with occasional diversions into recoverability
We walk in the dark places no others will enter
We stand on the bridge and no one may pass