I wonder what is the standing of the firebird against other DB like
Oracle, MS SQL, IBM DB2, My SQL, P. SQL.

I all I can say is that Firebird is better than MS SQL becase I have
use MS SQL before. In terms of speed, and ease of use, and
maintenance. Firebird is too good of MS SQL. In terms of SQL features
I think MS SQL lead this one. MS SQL has a lot of feature which could
be very useful although they are not SQL Standard. (correct me on
this one if Iam wrong Iam not very familiar with all the SQL reserve
word for Firebird). Though we can use UDF, but I think using UDF
could drag the speed performance down. I find MS SQL implementation
of triggers are very poor, in Firebird it is much better.

Comparing to other databases I don't know much. Comparing Firebird to
MySQL I think is not right in my opinion. Because MySQL is not a
complete DBMS. Searching in the web for articles about DBMS. I
usually find Oracle, MS SQL, and MySQL competing each other. I
seldom heard Firebird in commercial or enterprise community.

So I wonder what is the standing of Firebird.