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last_call_et tips

Oracle Database Tips by Donald BurlesonJanuary 31, 2015


Question: 
What does the v$session column last_call_et do?

 

Answer:  According to Oracle, the last_call_et column of v$session  "represents the elapsed time (in seconds) since the session has become active. . . .If the session status column is currently ACTIVE, then the value of last_call_et represents the elapsed time in seconds since the session has become active.  If the session status column is currently INACTIVE, then the value of last_call_et represents the elapsed time in seconds since the session has become inactive."


 In plain English, last_call_et will tell you how long a session has been running (in wall clock seconds), but this depends on the setting for the optimizer_mode parameter (as seen in the v$sql_plan view).  If it is optimizer_mode=all_rows (the default), the last_call_et will reflect the total elapsed time, while if you are using first_rows, the last_call_et will re-set for each change in status.  Here is a query using last_call_et:

select
   ses.username,
   ses.machine,
   ses.program,
   ses.status,

   ses.last_call_et,
   sql.hash_value,
   sql.sql_text
from
   v$session ses,
   v$sql sql
where
   ses.sql_hash_value = sql.hash_value
and
   ses.type = 'USER';

If you are running a DML (insert, update, delete) last_call_et tells you how long an update has been running.


Of course, a session many issue many DML and SQL statements so care must be used when interpreting the last_call_et column.

   
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Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

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