Interbase 6 did not ship with suitable ODBC drivers at the time of the test and was therefore unable to perform the test. The inability to perform the TPC-C test, however, may not be significant. PHP programmers can still develop advanced applications using Interbase, since PHP has native capability to connect with any database, eliminating any possible ODBC constraint. Moreover, Interbase does support a wide range of advanced SQL features. A very limiting factor of PostgreSQL is the way in which it handles large objects.
Large objects are binary files that are inserted into a database.
An example of a large object could be an image. Compared to MySQL or Interbase, PostgreSQL handles these in a poor fashion. By contrast, MySQL and Interbase provide native table support for large objects. This enables users to insert the binary data directly into the database. The direct insertion makes management of large objects much easier.