%iowait is more than 50 always in TOP. What is the reason?

Dear All,
In my server i have 2 databases APAC and AIX. In my top command the iowait % is more than always.
So how can i find which DB casuing this and from which session this IO wait is happening.
Please let me know how to tune to reduce this IO wait%
Thanks,
Mahi

You did not provide your version, just like most of the posters here.
Start using statspack, produce statspack reports and look at what your databases are waiting on. From statspack reports you can see which sqls are doing the I/O.

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