[8i] can someone help me on the use to explain the plan, tkprof, etc.. ?

I'm trying to follow the instructions when your query takes too long...

I'm trying to understand why a simple query take so long.

The query is:
 SELECT COUNT(*) AS tot_rows FROM my_table;
It takes 5 minutes to run (better), and the result is approximately 22 million (total of lines).

My generic username does not (obviously) allow access to PLAN_TABLE, so I had to open a session in the SYSTEM to run explain plan. In SQL * Plus, I typed in:
explain plan for (SELECT COUNT(*) AS tot_rows FROM my_table);
and the answer is 'explained '.

It's supposed to give me some sort of output, or am I missing something?

Then, the next step in the post I linked should use tkprof. I see that it says it will display a file path specified in the parameter. The only problem is, I don't have access to the db server. I work remotely and do not have anyway (remotely or directly) access the db server. Is it possible to have the output to my local computer file, or am I just S.O.L.?

How to hide is to run parallel processes for a query more quickly?

Well, that's why Oracle to invent it.

But the degree to which you use parallel processing (and effectiveness) depends on the amount of resources you have.

If you apply the concept poorly, it is possible that a sql statement can take more time under Parallels. PX has some overhead.

Would you recommend I have ask to my IT Department. collect statistics on this table?

I can't. Statistics management is a BIG deal and not something that can be easily summed up in a post on the forum.

Tags: Database

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