Deprecated

    • MMFiles Storage Engine:The MMFiles storage engine is deprecated starting with version3.6.0 and it will be removed in a future release.To change your MMFiles storage engine deployment to RocksDB, see:

    We recommend to switch to RocksDB even before the removal of MMFiles.RocksDB is the default storage enginesince v3.4.0.

    • —database.index-threads
    • —database.maximal-journal-size
    • —wal.*The collection attributes doCompact, indexBuckets, ,journalSize and path are only used with MMFiles and are thus alsodeprecated.

    • Simple Queries: Idiomatic interface in arangosh to perform trivial queries.They are superseded by , which can alsobe run in arangosh. AQL is a language on its own and way more powerful thanSimple Queries could ever be. In fact, the (still supported) _Simple Queries_are translated internally to AQL, then the AQL query is optimized and runagainst the database in recent versions, because of better performance andreduced maintenance complexity.

    From v3.5.0 on, the system collections _routing and are notcreated anymore when the _system database is first created (blank new datafolder). They are not actively removed, they remain on upgrade or backuprestoration from previous versions.