V$SESSION - SQL_ADDRESS for background processes
Date: Fri, 17 Apr 2009 16:20:18 +0100
I'm doing a query to join V$SESSION with V$SQLAREA to get the current SQL for each running session. Nothing fancy, it's just a quick view to help diagnose an issue. But I see some odd results, with background processes (specifically, ARC2) running what looks like user SQL (SELECT /*+ FIRST_ROWS */ * FROM user_table_1, user_table_2). I'm tempted to discount these, on the assumption that background processes wouldn't be running user SQL, so presumably SQL_ADDRESS and SQL_HASH_VALUE are meaningless for such processes, but is that a fair assumption? And if not, then why is that SQL present?
It's also interesting to note that EXECUTIONS in V$SQLAREA for that statement is 0. Presumably that implies that even though the statement was parsed, it has never been executed? What does that mean?
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Received on Fri Apr 17 2009 - 10:20:18 CDT