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(SQL Oracle) My query is running slower after implementation of Cluster.

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Hi Everyone!

So I implemented a cluster to optimize one of my queries and it seems to of slowed it down by 3 times its original speed with no optomization.

Here is the query:

Here is the cluster creating code:

Without optomization I was getting a elapsed time (looking at the trace results) of 0.60. After implementing just indexes (for one example, I did CREATE INDEX id_customer ON CUSTOMER2(custid);) it brought my elapsed time from 0.60 to 0.54 after multiple tests.

So the next step was clusters, yet after following trace results I am now getting 1.50.

I think it has something to do with the way I am setting the size, however I am very new to this so I am unable to spot what I am doing wrong.

Thank you for any help!
Dale Viljoen
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The query might not make much sense, but the goal was to make a sub nested unoptimized query so that we can see how much of a difference each optimization makes.
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