cache buffer chains contention

From: Adams, Matthew (GEA, 088130) <MATT.ADAMS_at_APPL.GE.COM>
Date: Wed, 10 Apr 2002 12:28:20 -0800
Message-ID: <F001.00440FCF.20020410122820@fatcity.com>

Ok, some guru please explain this to me.

process is waiting for 'latch free' according to v$session_wait and the value of P2 = 26 which is the cache buffer chains latch.
(while holding the HW enqueue, with a bunch of
processes waiting on HW)

State = 'WAITED KNOWN TIME', so I look at WAIT_TIME, which is 2.

However, the process does not appear to be doing ANYTHING and the seconds in the SECONDS_IN_WAIT column is increasing! This continues for about 30 seconds, when finally it finishes whatever it was doing and allows the next process to grab the HW enqueue

Why would SECONDS_IN_WAIT be increasing when it supposed to be done waiting already?

---

Matt Adams - GE Appliances - matt.adams_at_appl.ge.com Reason is 6/7ths of treason. - The Xtals

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Author: Adams, Matthew (GEA, 088130)
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Received on Wed Apr 10 2002 - 15:28:20 CDT