Why DB read file is still active after that the session was killed?

Hello

I have a query which is only select read only (no selection for update) on a big enough table (lines 500millions). The result must return a few million rows (1-10 million), because it is not properly written.

I killed all the sessions opened by the user who started the application, but after 3 hours, it is still ongoing.

I don't understand. It's a read. There is no data restoration that must be set aside, there is no generation of redo (low) because of this.
There are a few kinds made in this query.

So, why after that I'm killing a query that is read-only, the process runs for a very long time?

It is not the first time I'm facing this problem.

Any ideas?

Thank you
Daniel

>
I killed all the sessions opened by the user who started the application, but after 3 hours, it is still ongoing.
>
Have Yes - but you used the IMMEDIATE clause to kill HER?
>
IMMEDIATE specify IMMEDIATE load the Oracle database to ongoing transactions, releases all session locks, recover session state full and immediately returns control to you.
>
If you really want the process completed rather than simply "marked" termination then use DISCONNECT SESSION with the IMMEDIATE clause

See the "Clause of DISCONNECT SESSION" in the doc of the SQL language
http://docs.Oracle.com/CD/B28359_01/server.111/b28286/statements_2013.htm
>
Use the DISCONNECT SESSION clause to disconnect the current session to destroy the dedicated server process (or virtual circuit if the connection was made through a shared server).
. . .
The IMMEDIATE environment disconnects the session and retrieves the status of entire session immediately, without waiting for open transactions to complete.
>
View the results of the use of DISCONNECTION

Tags: Database

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