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I need an ordered key-value database (pretty much like LevelDB) for Java. Additionally to the set of features provided by Level DB, I also need the following :

  • Being able to get a keys position in the database.
  • Being able to supply a custom comparator.

Is there any (free, ideally open source) software which matches my needs ?

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For my purpose, Redis' sorted sets seem to be fitting (suggestion by someone on Discord) : https://redis.io/topics/data-types

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