RE: Reading UNDO and displaying it in v$session
- From: "Allen, Brandon" <Brandon.Allen@xxxxxxxxxxx>
- To: <makulev@xxxxxxx>, <kylelf@xxxxxxxxx>, <oracle-l@xxxxxxxxxxxxx>
- Date: Thu, 3 Apr 2008 09:32:56 -0700
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:
http://stanford.edu/dept/itss/docs/oracle/10g/server.101/b10755/dynviews
_2073.htm
<http://stanford.edu/dept/itss/docs/oracle/10g/server.101/b10755/dynview
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)
Regards,
Brandon
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