geth db --help

geth db --help
NAME:
   geth db - Low level database operations

USAGE:
   geth db command [command options] [arguments...]

COMMANDS:
   inspect              Inspect the storage size for each type of data in the database
   stats                Print leveldb statistics
   compact              Compact leveldb database. WARNING: May take a very long time
   [[get]]                  Show the value of a database key
   delete               Delete a database key (WARNING: may corrupt your database)
   put                  Set the value of a database key (WARNING: may corrupt your database)
   dumptrie             Show the storage key/values of a given storage trie
   freezer-index        Dump out the index of a specific freezer table
   import               Imports leveldb-data from an exported RLP dump.
   export               Exports the chain data into an RLP dump. If the <dumpfile> has .gz suffix, gzip compression will be used.
   metadata             Shows metadata about the chain status.
   check-state-content  Verify that state data is cryptographically correct
   inspect-history      Inspect the state history within block range
   help, h              Shows a list of commands or help for one command

OPTIONS:

          --help, -h                          (default: false)

geth db [ inspect | inspect-history | check-state-content | stats | metadata | dumptrie | get | --help ] geth db --datadir, geth --db.engine