Re: ora-4031 & large_pool

On 05/18/2004 03:53:58 PM, Terry Sutton wrote:
> One of our clients is getting the following error occasionally on a 9.2.0.3 DB:
> ORA-04031: unable to allocate 8704 bytes of shared memory ("large pool","unknown object","hash-join subh","kllcqas:kllsltba")

That would mean that the process is running out of hash join subheap (don't ask me how I know). Use hints (USE_NL would probably rid you of that nasty error and performance alike), decrease hash area or increase the large pool.

>
> The large pool is set at 16M, which isn't high, but they shouldn't be using the large pool at all. The don't > use MTS, they don't use parallel query or have parallel_automatic_tuning set to true, and they don't use RMAN.

Are you sure that they use Oracle RDBMS? Just kidding. They DO USE MTS, otherwise hash area would be allocated from the process memory and not from the large pool. The only way that hash heap is allocated from the large pool is if the join is done by the process connected to a shared and not to the dedicated server.

> AFAIK, those are the only things which use the large pool.

Apparently, the instance is haunted.

-- 
Mladen Gogala
Oracle DBA



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