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