The best replacement for vsam is db2.

The best alternatives to vsam are rated as following:
★★★★★  db2
★★  isam
★  qsam
★  iam
★  flat file

Your alternative for vsam is not listed? Suggest!
Speaking about vsam, one probably shouldn't forget about cobol.

Other search terms related to vsam and their ratings are:
★★★★★ cobol
You have in mind a companion for vsam and it is not yet here? Propose!



Google Trends

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vsam
db2
isam