The best replacement for db2 is oracle.

The best alternatives to db2 are rated as following:
★★★★★  oracle
★★★★  sql server
★★★  mysql
★★  udb
★★  sql
★  sybase
★  oracle comparison
★  db4
★  teradata
★  vsam
★  netezza
★  informix
  oracle market share
  ms sql
  oracle 11g
  postgres
  hana
  xone 92
  sql server 2005
  ims
  db2 udb

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Speaking about db2, one probably shouldn't forget about ur.

Other search terms related to db2 and their ratings are:
★★★★★ ur
★★★★ statement
★★★★ clause
★★★ hold
★★ default
★ ur syntax
★ clause syntax
★ ur option
★ ur example
★ rr
★ command
★ ur clause
rolling forward
hold cursor
syntax
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