Thanks for this.   Just a quick clarification.  Which version are/were u using.   

We are using 2.5.2.26539 (x64)  and the file IBDatabase.pas doesn't have the code which you had mentioned or even any reference to class TSchema.

This is independent of fb/ib version. The code is executed allways.

The source is from Delphi 2007. I don't know where is located this code in new ibx versions.

Also, during debug, would I be able to see as to which file is being invoked to execute the query?

I think so. Add the ibx component path to Delphi debug path.

Jesús