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Home -> Community -> Mailing Lists -> Oracle-L -> RE: Row cache locks on INSERTs with a sequence
It looks like sequence generation & caching rate is slower than your
insertion rate.
Waleed
-----Original Message-----
Sent: Friday, December 20, 2002 9:45 AM
To: Multiple recipients of list ORACLE-L
We are continually seeing sessions hanging on row cache locks, which in turn appear to be on dc_segments:
SID EVENT P1TEXT P1 P2TEXT P2 P3TEXT P3
----- ----------------- ---------- -- -------- -- --------- ---- 29 row cache lock cache id 13 mode 0 request 5 105 row cache lock cache id 13 mode 0 request 5
The offending SQL statement is an INSERT of the following form:
INSERT INTO TABLE (A,B,C,D...) VALUES (:b1, :b2, :b3, SEQUENCE.NEXTVAL,..)
The sequence in question has it's cache value set to the default of 20.
The developers keep insisting that it's a shared pool issue. I've researched Metalink and not come up with a whole lot. I've ran statspack and it has rendered advice with respect to the fact that a lot of new sequence values are being acquired, therefore the sequence cache size
needs examination.
But it is necessarily the small cache size of a sequence that can cause these locking issues?
Thanks.
Email: jeff.thomas_at_thomson.net
Indy DBA Master Documentation available at: http://gkmqp.tce.com/tis_dba <http://gkmqp.tce.com/tis_dba> Select 'Indy DBA' then 'DBA Web Pages'
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Please see the official ORACLE-L FAQ: http://www.orafaq.net
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Author: Khedr, Waleed
INET: Waleed.Khedr_at_FMR.COM
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