Laurent Schneider

one colleague just showed me how to insert duplicate rows in a table that has a primary key.

create table t(x number primary key);[F5]
Table created.
insert into t values (1);[F5]
1 row created.
insert into t values (1);[F5]
1 row created.

Hey, what happened? It took me quite a while to figure out which feature of Toad was “allowing” this.

Let’s look at Toad.ini (or View - ToadOptions - Transaction)

[SETTINGS]
ALWAYSROLLBACK=1
THREADQUERIES=1

Which means, Toad is starting a separate session each time a query is run (by F5 for instance) and at the end of this child session, it rollbacks. This is not the default, but this is pure magic!

Let’s prove it :

select count(*) from t where x=1;[F5]

  COUNT(*)
----------
         0

1 row selected.

This entry was posted on Tuesday, September 2nd, 2008 at 17:42 and is filed under oracle, sql, toad. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.
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