DB2
From Oracle FAQ
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DB2 or DB/2 is a DBMS system provided by IBM Corporation that competes with the Oracle database. DB2 is predominantly used on mainframe computers (i.e. OS/390). However, versions exist for AS/400, Unix, Linux and Windows as well.
Although DB2 seems to be quite a competent database platform, it doesn't have that big a market share outside its Mainframe stronghold.
Migration to/from Oracle
Oracle's Migration Workbench tool can be used to convert DB2 databases to Oracle.
Also see
- IMS - Information Management System