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enqueue statspack top5 timed events

P: n/a
Hi

Below is a copy of the top 5 timed events from my statspack. Don't
know how to detect what enqueue waited for what. Don't understand
Oracle Documentation's description on how to check V$SESSION_WAIT and
V$LOCK.

Can anyone help me on how to detect the enqueue wait event? Oracle
just said it means waiting to get access database resources but not
specifically what resources. Is that memory, freelist or mintran?

Any help is appreciated.

Thanks

David

Top 5 Timed Events
~~~~~~~~~~~~~~~~~~
% Total
Event Waits Time (s)
Ela Time
-------------------------------------------- ------------ -----------
--------
enqueue 28 83
82.64
CPU time 15
15.11
db file sequential read 319 2
1.61
control file parallel write 146 0
.31
db file parallel write 13 0
.20
Jul 19 '05 #1
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ni*******@yahoo.com (David) wrote in message news:<37*************************@posting.google.c om>...
Hi

Below is a copy of the top 5 timed events from my statspack. Don't
know how to detect what enqueue waited for what. Don't understand
Oracle Documentation's description on how to check V$SESSION_WAIT and
V$LOCK.

Can anyone help me on how to detect the enqueue wait event? Oracle
just said it means waiting to get access database resources but not
specifically what resources. Is that memory, freelist or mintran?

Any help is appreciated.

Thanks

David

Top 5 Timed Events
~~~~~~~~~~~~~~~~~~
% Total
Event Waits Time (s)
Ela Time
-------------------------------------------- ------------ -----------
--------
enqueue 28 83
82.64
CPU time 15
15.11
db file sequential read 319 2
1.61
control file parallel write 146 0
.31
db file parallel write 13 0
.20


enqueue = locks.
The sid in v$lock joins back to the sid in v$session.
The taddr in v$session joins to v$transaction
sql_address and sql_hash_value join to address and hash_value in v$sql
The various lockmodes are documented.

Sybrand Bakker
Senior Oracle DBA

Senior Oracle DBA
Jul 19 '05 #2

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