Are you already on Oracle Database 11g? If you're not, it's really cool ;-)
Nevertheless, this post is to warn all developers out there using Quest TOAD for Oracle.
The current release of TOAD is 9.1, this version is not supported with Oracle 11g (client). But even more important, the version that comes out half of November, TOAD 9.5 (see screenshot below which is a beta), isn't working with the Oracle 11g client neither!
I logged a support ticket at Quest. The support over there is really quick and helpful. In less than a day I got a message back that they were going to try it themselves, it went even to the technical people (development team) and after a few mails of back and for I got this final message: "Unfortunately, it was confirmed by our team's technical lead that Toad version 9.5 only support Oracle server 11g and not Oracle client 11g. My only suggestion for you is to install another client on your machine that is 10gR2 version or lower."
It's hard to believe that you need to install an Oracle Server just to get your development environment (TOAD) running ;-) Nevertheless, a workaround is to install Oracle 10g client, which I don't want to do as I'm connecting to 11g databases.
Or go for SQL Developer, a free alternative of Oracle.
A screenshot of the error "OCI version 220.127.116.11.0 is not supported"
I'm using both SQL Developer and TOAD as I think both have strengths and points to improve.
This post isn't to favor for SQL Developer, it's just to warn you... on my Windows Vista pc I'm obliged to go for SQL Developer as TOAD is not working with my Oracle 11g client.