The best replacement for relational database is object oriented database.

The best alternatives to relational database are rated as following:
★★★★★  object oriented database
★★★★★  flat file
★★★  nosql
★★  spreadsheet
★★  xml
★★  data warehouse
★★  object database
★★  graph database
★★  olap
★  cube
★  database
★  hierarchical database
★  big data
★  non relational database
★  non-relational database
★  hadoop
★  object relational database
  flat database
  hierarchical
  star schema
  multidimensional database
  dimensional database
  document database
  flat files
  relational database
  flat
  olap database
  non relational

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Google Trends

Scale is based on the average worldwide traffic of relational database in all years. Click on graph for more.
relational database
object oriented database
flat file