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Don Burleson Blog 







 final_blocking_session & final_blocking_instance Tips

Oracle Database Tips by Donald BurlesonMarch 23, 2015

Question:  What are the final_blocking_instance, and final_blocking_session columns of gv$session used for?

Answer:  There are two new column in 11g r2 gv$session view to help in identifying blocking sessions, final_blocking_instance, and final_blocking_session:

  • final_blocking_instance:  This column of gv$session is the instance identifier of the final blocking session. This column is valid only if final_blocking_session_status=valid.
  • final_blocking_session:  This column of gv$session is the session identifier of the final blocking session. This column is valid only if final_blocking_session_status=valid.

This example script extracts final_blocking_instance and final_blocking_session from gv$session.  For full scripts, see the Oracle Script collection download.

   inst_id||' '||sid||','||serial# inst_sid_s#,

   row_wait_obj#||','||row_wait_block#||','||row_wait_row# obj_lck,
   blocking_session_Status||' '||blocking_instance||','||blocking_session blk_info,       
   final_blocking_session_Status||' '||final_blocking_instance||','||final_blocking_session f_blk_info,

   lockwait is not null
order by

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