LITTLE TIME WAITED and WAITED KNOWN TIME

Hello Experts,

I was going through one of the article in Tuning oracle magazine.

It deals with a very basic situation. A user has logged two separate a schema and interpreted under tasks

1 > first session user executes an update statement.

setting a day emp set ename = 'ABC' where empno = 7400;

The user does not commit it.

2 > second session user executes the same update statement.



Now to the first user session has run the following query.

Select the sid, session event $ v where username = 'SCOTT ';

STATE OF SID EVENT
---------- ------------------- ----------------------------------------------------------------
21 pending enq: TX - line lock conflict
147. WAITED short TIME SQL * Net message to client


I saw in the magazine it is written that the State of the session 1 (21 SID) is KNOWN WHEREAS in TIME.
But when I run the same query arrived as EXPECTED short AMOUNT of TIME.

It is written in the following paragraph of the article only

-quote

On the other hand, 2832, "WAITED KNOWN TIME" session state, means that it works, do not wait - right now.

-End quote

My question is when the session state is WHEREAS SHORTLY means also it works, do not wait for this moment.


My DB information written below

BANNER
--------------------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production
PL/SQL Release 11.2.0.1.0 - Production
CORE 11.2.0.1.0 Production
AMT for 32-bit Windows: Version 11.2.0.1.0 - Production
NLSRTL Version 11.2.0.1.0 - Production


Concerning
Rajat

Published by: Rajat on 14 April 2013 20:10

Rajat says:

My question is when the session state is WHEREAS SHORTLY means also it works, do not wait for this moment.

If you look at listing 2 in the reference that you sent, you'll see NOTHING else that "The EXPECTATION" decodes to "Work" - so "EXPECTED SHORTLY" means he works.

The difference between 'WHEREAS SHORT TIME' and 'WHEREAS KNOWN TIME' is less a wait of 1/100 seconds 'short '.

Concerning
Jonathan Lewis

Tags: Database

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