Hi Iain,
Let me quote from my book ... "Note also that the 'enqueue timeouts' statistic
in V$SYSSTAT does not represent the number of enqueue wait timeouts. Rather,
this statistic is incremented when an enqueue request or enqueue conversion is
aborted entirely. This can be due to a distributed transaction timeout, but
usually relates to locks requested in no-wait mode.
...
It is sometimes suggested that 'enqueue_resources' should be increased to combat
enqueue waits. But please note that there is absolutely no substance to this
suggestion. Oracle will return an ORA-52 or ORA-53 error if it fails to find a
free slot in the enqueue resources or enqueue locks fixed arrays respectively.
Beyond that, the setting of the 'enqueue_resources' and '_enqueue_locks'
parameters is unimportant."
If you are really interested in setting these parameters, use V$RESOURCE_LIMIT.
However, a more helpful course of action is to look at X$KSQST to investigate
what type of enqueues those waits are coming from. There is a script called
"enqueue_stats.sql" at http://www.ixora.com.au/scripts/locks.htm on the Ixora
web site that might help.
@ Regards,
@ Steve Adams
@ http://www.ixora.com.au/
@ http://www.christianity.net.au/
-----Original Message-----
Sent: Friday, 20 April 2001 21:40
To: Multiple recipients of list ORACLE-L
Can anyone offer advice on what the problem may be with the following from
v$sysstat on one of our databases.
NAME VALUE
-------------------------- ---------
enqueue timeouts 17499101
enqueue waits 446362
enqueue deadlocks 2
enqueue requests 47731729
enqueue conversions 1228500
enqueue releases 30232445
Enqueue_resources is set at 5000, DML_Locks is at 4000 and sessions at 412
so enqueue_resources looks high already but I came across a note which
suggested increasing enqueue_resources where timeouts were occurring.
Would anything else be causing this or is there a way to calculate what
enqueue_resource should be set at.
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--
Author: Steve Adams
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