RE: Reading UNDO and displaying it in v$session

From: Allen, Brandon <>
Date: Thu, 3 Apr 2008 09:32:56 -0700
Message-ID: <04DDF147ED3A0D42B48A48A18D574C450B1AF40E@NT15.oneneck.corp>

Hi Milen,

I believe the purpose of row_wait_obj#, and the other row_wait columns is only to report relevant information when a session is waiting on a blocking lock, i.e. the "enqueue" wait event for a TX (aka Transaction) lock. Here are the column descriptions from the documentation: _2073.htm
< s_2073.htm>

Please note the following:

ROW_WAIT_ROW# - Current row being locked. This column is valid only if the session is currently waiting for another transaction to commit and the value of ROW_WAIT_OBJ# is not -1. (emphasis mine)


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Received on Thu Apr 03 2008 - 11:32:56 CDT

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