FINAL_BLOCKING_INSTANCE and FINAL_BLOCKING_SESSION

Discovered these columns on the v$session and gv$session views:

FINAL_BLOCKING_INSTANCE and FINAL_BLOCKING_SESSION

These appear to be new in 11.2.  I checked an 11.1.0.7 instance and they weren’t there.  They were there in an 11.2.0.1 instance.  Interestingly an early version of the 11.2 documentation didn’t have them.  I have Oracle document E10820-03 on my hard drive and it didn’t have a reference to these columns, but the most current 11.2 docs do.

Anyway, I used these to determine which Oracle session was holding library cache locks.  In earlier versions I don’t believe that the v$/gv$session views were that helpful with library cache locks.  They worked with regular locks only.  So, check these out when you have a locking situation and don’t know which SID is blocking the others.

Current v$session documentation here: http://docs.oracle.com/cd/E11882_01/server.112/e25513/dynviews_3016.htm

– Bobby

About Bobby

I live in Chandler, Arizona with my wife and three daughters. I work for US Foods, the second largest food distribution company in the United States. I have worked in the Information Technology field since 1989. I have a passion for Oracle database performance tuning because I enjoy challenging technical problems that require an understanding of computer science. I enjoy communicating with people about my work.
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