A Tale of Two SQLs 2004-05-03 - By solbeach@(protected)
I had a similar issue a couple of months ago.
My problem was that a few "popular " tables,
which are regularly updated/accessed by most of the
application had INITRANS too low & sessions were going into
ENQUEUE wait state.
Run this simple SQL the next time a "slowdown " occurs...
SELECT DECODE(request,0, 'Holder: ', 'Waiter: ')||sid sess,
id1, id2, lmode, request, type
FROM V$LOCK
WHERE (id1, id2, type) IN
(SELECT id1, id2, type FROM V$LOCK WHERE request >0)
ORDER BY id1, request
/
We had folks to started an UPDATE (got a lock)
and then literally went to lunch to 90 minutes!
Other sessions would hang quietly waiting for the resource.
HTH & YMMV!
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