Free load test tool

Hello all,
are there any free load testing tool for sql queryl ?? We have this sql that i want to change and use a parallel hint....so i wanted to load test...maybe 50 concurrent user executing that at the same time....and see how the performance is on the server ...are there any freeware tool for that or anything that i can do ?? i am on 10.2.0.3 (AIX)....

I'm a bit confused.
Parallel query improves performance by allowing one session to use more of the database's resources than a single session could normally utilize. That makes it ideal for data warehouse environments where there are few concurrent users each running very resource intensive SQL statements. Parallel query is poorly suited, in general, for OLTP workloads because letting one session spawn multiple slave processes takes resources away from other sessions. If you really have 50 users simultaneously running a query, it should almost certainly not be parallelized. Even if each session creates only 2 slave processes, that's 100 simultaneous slave processes which probably overloads anything below, say, a 64-core box. Hopefully, your database is configured, in that case, to disable parallelism to avoid overloading the server. But if the database is configured to disable parallelism in that case, adding the PARALLEL hint will have no effect at high load.
Justin

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