Re: Sudden occurrence of SHARED_POOL LATCH waits - DB up since 4/3/2018
- From: Rich J <rjoralist3@xxxxxxxxxxxxxxxxxxxxx>
- To: oracle-l@xxxxxxxxxxxxx
- Date: Fri, 01 Jun 2018 07:34:06 -0500
On 2018/05/31 11:29, Chris Taylor wrote:
Background:
We've got a database with 4TB of RAM and a 260GB shared pool. Everything was
running normally until 2 nights ago when a regularly scheduled job that does
TONS of DDL suddenly blew up the shared pool.
Trying to query x$ksmsp for shared pool sizes is also causing huge amounts of
latch waits.
See Tanel Poder's blog about querying x$ksmsp on a live instance --
definitely not recommended.
Also, could you be experiencing large amounts of invalidations with the
DDL that's causing your contention? I had severe issues with a 11GB
shared pool (AMM -- turned that noise off a long time ago) hanging the
instance for 10m while stats collection invalidated 250K bindless SQLs
in the pool.
Just a thought...
Rich
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