The worldwide market for relational database management systems (RDBMS) grew by 9.4% to $14.6 bln in 2005, IDC says. There were no changes among the top 5 RDBMS vendors from 2004 to 2005, with Oracle capturing top honors with 44.6% of the worldwide market. Oracle was followed by IBM with 21.4% market share, and ranked third was Microsoft with 16.8% market share. Rounding out the top 5 were Sybase and NCR Teradata, with 3.5% and 2.9% market share, respectively. Microsoft experienced the strongest YTY growth on a percentage basis, and Oracle the strongest growth on a whole dollar basis in 2005.