RE: Lock on a sequence

From: Deshpande, Kirti <kirti.deshpande_at_verizon.com>
Date: Mon, 23 Sep 2002 11:14:51 -0800
Message-ID: <F001.004D6F67.20020923111451@fatcity.com>

For incrementing sequence number, Oracle has to use an SQ enqueue latch. To minimize the need for this latch, you can increase the cache size for the Sequences. Additionally, you can also consider KEEPing the Sequence number in Shared pool using dbms_shared_pool.keep() package procedure.

Kirti

-----Original Message-----
Sent: Monday, September 23, 2002 12:44 PM To: Multiple recipients of list ORACLE-L

Hello List,

I have a need to try an replicate a problem that has occured on our production
environment. It seems that occassionally our response time dives to the buttom
of the barrel in regards to our tuxedo application. When this occurs we have
found that many of the blocked sessions are trying to query a sequence.

select my.sequence_list.next_value from dual

Does anyone know a possible cause for a sequence to be locked?

Does anyone know how to lock a sequence?

Thanks ahead of time.

Tim Boles
DBA
Lockheed Martin Information Systems

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Author:
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Author: Deshpande, Kirti
INET: kirti.deshpande_at_verizon.com

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