Re: Session PGA memory max exceeded 2 GB and crashes.
- From: "Norman Dunbar" <norman.dunbar@xxxxxxxxxxxxxxxxxxxxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>, <jonathan@xxxxxxxxxxxxxxxxxx>
- Date: Thu, 21 Dec 2006 09:55:25 +0000
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.
:o(
>> Change the code to:
>> WHERE MONTHS_BETWEEN(SYSDATE, LAST_USED_DATTIM) >
>> (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.
Cheers,
Norman.
Norman Dunbar.
Contract Oracle DBA.
Rivers House, Leeds.
Internal : 7 28 2051
External : 0113 231 2051
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