I did not test this but this may be related to autonomous transactions if
you use them. If your session has an active transaction and you start an
autonomous transaction, you have 2 concurrent transactions from the same
session.
*From:* oracle-l-bounce@xxxxxxxxxxxxx [mailto:
oracle-l-bounce@xxxxxxxxxxxxx] *On Behalf Of *LS Cheng
*Sent:* Thursday, January 18, 2007 4:42 PM
*To:* mark.powell@xxxxxxx
*Cc:* oracle-l
*Subject:* Re: maxconcurrency and active sessions
That makes things even worse, from v$undostat it constantly shows
maxconcurrency over 50 however v$session never shows more than 35 concurrent
active sessions. shouldnt the opposite be expected?
On 1/18/07, *Powell, Mark D* <mark.powell@xxxxxxx> wrote:
>> if maxcouncurrency seens in v$undostat is equal to the number of ACTIVE
sessions shown in v$session <<
No. An active session as shown in v$session does not have to be
performing DML but could be busy querying.
There is a difference between the number of concurrent sessions and the
number of concurrent transactions.
-- Mark D Powell --
Phone (313) 592-5148
------------------------------
*From:* oracle-l-bounce@xxxxxxxxxxxxx [mailto:
oracle-l-bounce@xxxxxxxxxxxxx] *On Behalf Of *LS Cheng
*Sent:* Thursday, January 18, 2007 8:14 AM
*To:* oracle-l
*Subject:* maxconcurrency and active sessions
Hi
I was wondering if maxcouncurrency seens in v$undostat is equal to the
number of ACTIVE sessions shown in v$session and are NOT backkground
processes?
I am trying to determine a system concurrency, usually I watch number of
active sessions but I am considering using maxconcurrency.
TIA
--
LSC
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