How do I check the cost of the query ?

I did
set autotrace on traceonly
set timing on
and executed a select statement.
I got a execution plan and statistics
What should I check in this output.
Pls help me how to tune the query

The EXPLAIN plan display will have a header called COST and that's where the cost of individual steps and overall cost of the SQL statement will be displayed. There is no such thing as normal value for cost.
Also, a high cost does not necessarily mean that the query execution plan is bad. Cost is dependent on how the statistics on tables / indexes etc. have been collected.
Shakti
http://www.impact-sol.com
Developers of Guggi Oracle - Tool for DBAs and Developers

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