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Last_call_et keeps resetting, no other evidence of activity

JustinCaveSep 20 2013 — edited Sep 20 2013

I'm trying to debug an issue with a process that pulls a bunch of data into an Access database from a couple of Oracle databases (yes, we're working on killing Access).  Almost everything I can see is telling me that Oracle is doing nothing and it's purely an Access issue but last_call_et in v$session keeps resetting itself which makes me believe that Oracle is doing something.  I'd be really appreciative if anyone can help me figure out what I'm missing.

What I'm Seeing

When I query gv$session, I'm seeing the session that Access opened.  Every time I look, the status is INACTIVE, sql_id is NULL, and prev_sql_id is a constant value.  When I look at gv$sql for that prev_sql_id, executions isn't increasing and executions = end_of_fetch_count.  So far, so good, Oracle's off the hook.

However, when I pull in LAST_CALL_ET from gv$session, that value never gets above 10 seconds.  It's constantly resetting.  That makes me believe that Oracle is doing something every few seconds.  But I can't for the life of me think of anything that it could possibly be doing that wouldn't cause a change in prev_sql_id or a change in the number of executions of the SQL statement.

Is there something that I'm overlooking here?

Thanks!

Justin
This post has been answered by Jonathan Lewis on Sep 20 2013
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Jonathan Lewis

Which version of Oracle ?

What does v$session_wait_history show for that session.

What do you see as the state and event over a short set of queries to v$session for that sid ?

Regards

Jonathan Lewis


JustinCave

Sorry.

The database is 11.2.0.3 on AIX.

I'll take a look at gv$session_wait_history momentarily, we've killed the process and are restarting after giving the Access database a couple good kicks in the pants.

Justin

JustinCave

gv$session_wait_history is reporting events of

SQL*Net message to client

SQL*Net message from client

It does appear that the Access changes resolved the overall issue.  But while Access was chugging away, I was still seeing LAST_CALL_ET getting reset with no other obvious signs of activity.

Justin

Jonathan Lewis
Answer 
JustinCave wrote:




gv$session_wait_history is reporting events of




SQL*Net message to client


SQL*Net message from client




It does appear that the Access changes resolved the overall issue.  But while Access was chugging away, I was still seeing LAST_CALL_ET getting reset with no other obvious signs of activity.




Justin

If it was changing between FROM and TO there must have been some message coming from Access and bouncing back without an error. Possibly some sort of OCI "ping" type call that didn't involve an SQL statement.

Update:  something like a "set context" or "set client identifier" perhaps; possibly a (non-SQL) rollback or commit


Regards

Jonathan Lewis

Marked as Answer by JustinCave · Sep 27 2020
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Locked on Oct 18 2013
Added on Sep 20 2013
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