NAME

       mdb_stat - LMDB environment status tool

SYNOPSIS

       mdb_stat [-V] [-e] [-f[f[f]]] [-n] [-r[r]] [-a | -s subdb]  envpath

DESCRIPTION

       The mdb_stat utility displays the status of an LMDB environment.

OPTIONS

       -V     Write the library version number to the standard output, and exit.

       -e     Display information about the database environment.

       -f     Display  information  about  the  environment freelist.  If -ff is given, summarize
              each freelist entry.  If -fff is given, display the full list of page  IDs  in  the
              freelist.

       -n     Display the status of an LMDB database which does not use subdirectories.

       -r     Display  information  about  the  environment  reader table.  Shows the process ID,
              thread ID, and transaction ID for each active  reader  slot.  The  process  ID  and
              transaction  ID are in decimal, the thread ID is in hexadecimal. The transaction ID
              is displayed as "-" if the reader does not currently have a read transaction  open.
              If  -rr  is  given, check for stale entries in the reader table and clear them. The
              reader table will be printed again after the check is performed.

       -a     Display the status of all of the subdatabases in the environment.

       -s subdb
              Display the status of a specific subdatabase.

DIAGNOSTICS

       Exit status is zero if no errors occur.  Errors result in a non-zero  exit  status  and  a
       diagnostic message being written to standard error.

SEE ALSO

       mdb_copy(1)

AUTHOR

       Howard Chu of Symas Corporation <http://www.symas.com>