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Re: Session PGA memory max exceeded 2 GB and crashes.

From: Norman Dunbar <>
Date: Thu, 21 Dec 2006 09:55:25 +0000
Message-Id: <>

Morning Jonathan,

>> In general you can expect the function to be called
>> twice if you use it to identify an indexed access path
>> (as in your later experiment, perhaps).
>> id > function(const)

You are correct. I didn't do an explain plan but now that I have it was indeed using an index. The function was called once. I added a full hint and the function was indeed called for each row in the table. It *is* looking more and more likely that we have a memory leak in the PJ/SQL - I shall have to delve deeper.

>> However, for a tablescan - which this seems to be -
>> the function is called once per row. (Until 10g where
>> deterministic functions nearly work).

The original query does indeed use a full scan. I should have made that clear in my original post.

>> I would guess that you have a memory leak in the pj/sql.

>> Change the code to:
>> (select Pk_Utils.fnc_get_sys_par ( 'HOUSE_AUDIT') from dual)
>> and I think scalar subquery caching will probably kick in -
>> so you should only call the function once, and bypass any
>> leakage problem. You'll also save a lot of CPU too, probably.

I have tested this and it does one call to the function. I shall see if I can get a test in the system and see how it goes.

Thanks very much.


Norman Dunbar.
Contract Oracle DBA.
Rivers House, Leeds.

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Received on Thu Dec 21 2006 - 03:55:25 CST

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