Question

How to reconnect to a previous session in Oracle?

Asked by: myrat

Hi, after I used sqlplus to execute an update on an table, my network was disconnected before I commit. After that, I can't delete from the table now (I need to delete all data). I'm a developer so I don't have the right to terminate the process, so I'm thinking is there any way that I can re-connect to the session? I can know the session number.

In TOAD, when I was idle for too long and got disconnected, I can use File->Test Connections (Reconnect) and I'm in the previous session again. Wondering if the same can be done.

I'm using Oracle 8i, if this matters.

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Asked On
2006-02-28 at 01:44:24ID21754352
Tags

oracle

,

reconnect

,

toad

,

session

Topic

Oracle Database

Participating Experts
1
Points
300
Comments
8

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Answers

 

by: ploubierPosted on 2006-02-28 at 05:43:33ID: 16065017

You can't reconnect to a lost session : TOAD opens a new session with the cached credentials when you choose Test connections.
And if you were disconnected before committing your update, you don't have to delete anything.

 

by: myratPosted on 2006-02-28 at 19:06:20ID: 16072027

I think TOAD resumes the session because, if you have a global temp table, and you store something to the table, it should only be available for the session. After your connection lost and you resume, the contents in the temp table is still there.

And I need to commit because, when I say "update ..." without a commit, the table is locked. I know the changes are not made, but you need to commit before another session can do delete all. For e.g., see http://asktom.oracle.com/pls/ask/f?p=4950:8:::::F4950_P8_DISPLAYID:6369740147072

"The delete from X will cause a FULL TABLE lock on both A and B before it starts
processing.
If another session has a lock on a row in X that your delete will ultimately hit
-- that will block your delete."

 

by: myratPosted on 2006-02-28 at 19:21:26ID: 16072088

Or is there any way to set the idle disconnect time?

 

by: ploubierPosted on 2006-03-01 at 00:24:48ID: 16073259

You should provide the session number to your DBA : he'll be able to kill your "living dead" session, which will release the lock.
"Idle disconnect time" can be defined in many ways. Two of them are a sqlnet parameter, and a user profile, but I don't think the DBA will change these.

 

by: myratPosted on 2006-03-01 at 19:05:56ID: 16081596

ploubier: of course I can always just ask dba to kill the process. But that's not what I want to do. I wish to resume, just like TOAD does. I thought it was impossible, but then how do you explain for TOAD?

 

by: ploubierPosted on 2006-03-02 at 01:47:39ID: 16083208

Sorry, but I tried to reproduce what you describe, without success...
There is no "resume" functionality in TOAD, just because Oracle doesn't support it once ORA-12571 has been thrown.
I tested again, and as I told you in my first post, "Test connections" opens a new session (using username/password previously passed), and you have to kill the pending one to alter global temporary tables locked.

Here is the scenario :
1/ create global temp table
2/ insert values
3/ update rows
4/ disconnect network cable
5/ refresh detail panel of schema browser under data tab -> ORA-12571
6/ reconnect RJ45
7/ Test connections (Reconnect)
8/ refresh detail panel of schema browser under data tab -> global temp table is empty and locked (ORA-14452)
9/ duplicate session, need to alter system kill session to release temp table

20120131-EE-VQP-002

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