The worldwide market for relational database management systems (RDBMS) grew by 9.4% to $14.6 billion in 2005, according to preliminary figures released by IDC.

There were no changes among the top 5 RDBMS vendors from 2004 to 2005:
Oracle........... 44.6%
IBM................ 21.4%
Microsoft........16.8%
Sybase.............3.5%
NCR Teradata... 2.9%

Microsoft experienced the strongest year-over-year growth on a percentage basis, and Oracle the strongest growth on a whole dollar basis in 2005.