Oracle Corp is boasting that last year it increased its market share lead over Microsoft Corp in relational database software for Windows NT, according to research published by International Data Corp. Oracle increased its database license revenue share lead over Redmond by 5.3 percentage points from 1996 to 1997 for a total share of 35.7%, according to IDC. Microsoft’s share declined to 30.4% in that same 12-month period. The research shows that Oracle’s NT database license revenues grew 30.5% more than Microsoft’s, while its unit shipments increased by 77.8%, 21.1% more than Microsoft SQL Server during the same period. Oracle also said that a separate report by AMR Research Inc, shows that it increased its majority share of the market for databases that run ERP applications by 4% in 1997. For the year, more than 52% of database license revenues within the ERP market went to Oracle, according to AMR, compared to 5% for Microsoft SQL Server. AMR also estimated the total database market for ERP applications in 1997 was $5.1bn.