path: root/debian/mongotop.1

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.TH "MONGOTOP" "1" "October 03, 2013" "2.4" "mongodb-manual"
.SH NAME
mongotop \- MongoDB
.
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.SH SYNOPSIS
.sp
\fBmongotop\fP provides a method to track the amount of time a
MongoDB instance spends reading and writing data. \fBmongotop\fP
provides statistics on a per\-collection level. By default,
\fBmongotop\fP returns values every second.
.sp
\fBSEE ALSO:\fP
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.INDENT 3.5
For more information about monitoring MongoDB, see
http://docs.mongodb.org/manual/administration/monitoring\&.
.sp
For additional background on various other MongoDB status outputs
see:
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.IP \(bu 2
http://docs.mongodb.org/manual/reference/command/serverStatus
.IP \(bu 2
http://docs.mongodb.org/manual/reference/command/replSetGetStatus
.IP \(bu 2
http://docs.mongodb.org/manual/reference/command/dbStats
.IP \(bu 2
http://docs.mongodb.org/manual/reference/command/collStats
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.sp
For an additional utility that provides MongoDB metrics
see \fBmongostat\fP\&.
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.UNINDENT
.SH OPTIONS
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.TP
.B mongotop
.UNINDENT
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.TP
.B mongotop
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.TP
.B \-\-help
Returns a basic help and usage text.
.UNINDENT
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.TP
.B \-\-verbose, \-v
Increases the amount of internal reporting returned on the command
line. Increase the verbosity with the \fB\-v\fP form by including the
option multiple times, (e.g. \fB\-vvvvv\fP\&.)
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.TP
.B \-\-version
Print the version of the \fBmongotop\fP utility and exit.
.UNINDENT
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.TP
.B \-\-host <hostname><:port>
Specifies a resolvable hostname for the \fBmongod\fP from which you
want to export data. By default \fBmongotop\fP attempts to
connect to a MongoDB process running on the localhost port number
\fB27017\fP\&.
.sp
Optionally, specify a port number to connect a MongoDB instance
running on a port other than \fB27017\fP\&.
.sp
To connect to a replica set, you can specify the replica set seed
name, and a seed list of set members, in the following format:
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.sp
.nf
.ft C
<replica_set_name>/<hostname1><:port>,<hostname2:<port>,...
.ft P
.fi
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.TP
.B \-\-port <port>
Specifies the port number, if the MongoDB instance is not running on
the standard port. (i.e. \fB27017\fP) You may also specify a port
number using the \fImongotop \-\-host\fP command.
.UNINDENT
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.TP
.B \-\-ipv6
Enables IPv6 support that allows \fBmongotop\fP to connect
to the MongoDB instance using an IPv6 network. All MongoDB programs
and processes, including \fBmongotop\fP, disable IPv6
support by default.
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.TP
.B \-\-username <username>, \-u <username>
Specifies a username to authenticate to the MongoDB instance, if
your database requires authentication. Use in conjunction with the
\fImongotop\fP option to supply a
password.
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.TP
.B \-\-password <password>, \-p <password>
Specifies a password to authenticate to the MongoDB instance. Use
in conjunction with the \fI\-\-username\fP
option to supply a username.
.sp
If you specify a \fI\-\-username\fP and do
not pass an argument to \fI\-\-password\fP, \fBmongotop\fP
will prompt for a password interactively. If you do not specify a
password on the command line, \fI\-\-password\fP must be the last
argument specified.
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.TP
.B \-\-authenticationDatabase <dbname>
New in version 2.4.

.sp
Specifies the database that holds the user\(aqs (e.g
\fI\-\-username\fP) credentials.
.sp
By default, \fBmongotop\fP assumes that the database specified to the
\fI\-\-db\fP argument holds the user\(aqs credentials, unless you
specify \fI\-\-authenticationDatabase\fP\&.
.sp
See \fBuserSource\fP,
http://docs.mongodb.org/manual/reference/privilege\-documents and
http://docs.mongodb.org/manual/reference/user\-privileges for more information about
delegated authentication in MongoDB.
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.TP
.B \-\-authenticationMechanism <name>
New in version 2.4.

.sp
Specifies the authentication mechanism. By default, the
authentication mechanism is \fBMONGODB\-CR\fP, which is the MongoDB
challenge/response authentication mechanism. In MongoDB Enterprise,
\fBmongotop\fP also includes support for \fBGSSAPI\fP to handle
Kerberos authentication.
.sp
See http://docs.mongodb.org/manual/tutorial/control\-access\-to\-mongodb\-with\-kerberos\-authentication
for more information about Kerberos authentication.
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.TP
.B \-\-locks
New in version 2.2.

.sp
Toggles the mode of \fBmongotop\fP to report on use of
per\-database \fIlocks\fP\&. These data are useful for
measuring concurrent operations and lock percentage.
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.TP
.B <sleeptime>
The final argument is the length of time, in seconds, that
\fBmongotop\fP waits in between calls. By default
\fBmongotop\fP returns data every second.
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.SH FIELDS
.sp
\fBmongotop\fP returns time values specified in milliseconds
(ms.)
.sp
\fBmongotop\fP only reports active namespaces or databases,
depending on the \fI\%--locks\fP option. If you don\(aqt see a database
or collection, it has received no recent activity. You can issue a
simple operation in the \fBmongo\fP shell to generate activity to
affect the output of \fBmongotop\fP\&.
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.TP
.B mongotop.ns
Contains the database namespace, which combines the database name
and collection.
.sp
Changed in version 2.2: If you use the \fI\%--locks\fP, the \fBns\fP field does not
appear in the \fBmongotop\fP output.

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.TP
.B mongotop.db
New in version 2.2.

.sp
Contains the name of the database. The database named \fB\&.\fP refers
to the global lock, rather than a specific database.
.sp
This field does not appear unless you have invoked
\fBmongotop\fP with the \fI\%--locks\fP option.
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.TP
.B mongotop.total
Provides the total amount of time that this \fBmongod\fP spent
operating on this namespace.
.UNINDENT
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.TP
.B mongotop.read
Provides the amount of time that this \fBmongod\fP spent
performing read operations on this namespace.
.UNINDENT
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.TP
.B mongotop.write
Provides the amount of time that this \fBmongod\fP spent
performing write operations on this namespace.
.UNINDENT
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.TP
.B mongotop.<timestamp>
Provides a time stamp for the returned data.
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.SH USE
.sp
By default \fBmongotop\fP connects to the MongoDB instance
running on the localhost port \fB27017\fP\&. However, \fBmongotop\fP can optionally
connect to remote \fBmongod\fP
instances. See the \fI\%mongotop options\fP for more
information.
.sp
To force \fBmongotop\fP to return less frequently specify a number, in
seconds at the end of the command. In this example, \fBmongotop\fP will
return every 15 seconds.
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.sp
.nf
.ft C
mongotop 15
.ft P
.fi
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.sp
This command produces the following output:
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.sp
.nf
.ft C
connected to: 127.0.0.1

                    ns       total        read       write           2012\-08\-13T15:45:40
test.system.namespaces         0ms         0ms         0ms
  local.system.replset         0ms         0ms         0ms
  local.system.indexes         0ms         0ms         0ms
  admin.system.indexes         0ms         0ms         0ms
                admin.         0ms         0ms         0ms

                    ns       total        read       write           2012\-08\-13T15:45:55
test.system.namespaces         0ms         0ms         0ms
  local.system.replset         0ms         0ms         0ms
  local.system.indexes         0ms         0ms         0ms
  admin.system.indexes         0ms         0ms         0ms
                admin.         0ms         0ms         0ms
.ft P
.fi
.UNINDENT
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.sp
To return a \fBmongotop\fP report every 5 minutes, use the
following command:
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.sp
.nf
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mongotop 300
.ft P
.fi
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.sp
To report the use of per\-database locks, use \fImongotop \-\-locks\fP,
which produces the following output:
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.sp
.nf
.ft C
$ mongotop \-\-locks
connected to: 127.0.0.1

                  db       total        read       write          2012\-08\-13T16:33:34
               local         0ms         0ms         0ms
               admin         0ms         0ms         0ms
                   .         0ms         0ms         0ms
.ft P
.fi
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.SH AUTHOR
MongoDB Documentation Project
.SH COPYRIGHT
2011-2013, MongoDB, Inc.
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