mongotop.1

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.TH "MONGOTOP" "1" "January 30, 2015" "3.0" "mongodb-manual"
.SH NAME
mongotop \- MongoDB Activity Monitor
.
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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
\fBIMPORTANT:\fP
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.INDENT 3.5
In order to connect to a \fBmongod\fP that enforces
authorization with the \fI\-\-auth\fP option, the
\fI\-\-username\fP and
\fI\-\-password\fP options must be used, and the
user specified must have the \fBserverStatus\fP and
\fBtop\fP privileges.
.sp
The most appropriate built\-in role that has these privileges is
\fBclusterMonitor\fP\&.
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.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:
.INDENT 0.0
.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
.UNINDENT
.sp
For an additional utility that provides MongoDB metrics
see \fBmongostat\fP\&.
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.SH OPTIONS
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.TP
.B mongotop
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.TP
.B mongotop
.UNINDENT
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.TP
.B \-\-help
Returns information on the options and use of \fBmongotop\fP\&.
.UNINDENT
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.TP
.B \-\-verbose, \-v
Increases the amount of internal reporting returned on standard output
or in log files. Increase the verbosity with the \fB\-v\fP form by
including the option multiple times, (e.g. \fB\-vvvvv\fP\&.)
.UNINDENT
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.TP
.B \-\-quiet
Runs the \fBmongotop\fP in a quiet mode that attempts to limit the amount
of output.
.sp
This option suppresses:
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.IP \(bu 2
output from \fIdatabase commands\fP
.IP \(bu 2
replication activity
.IP \(bu 2
connection accepted events
.IP \(bu 2
connection closed events
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.TP
.B \-\-version
Returns the \fBmongotop\fP release number.
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.TP
.B \-\-host <hostname><:port>, \-h <hostname><:port>
\fIDefault\fP: localhost:27017
.sp
Specifies a resolvable hostname for the \fBmongod\fP to which to
connect. By default, the \fBmongotop\fP attempts to connect to a MongoDB
instance running on the localhost on port number \fB27017\fP\&.
.sp
To connect to a replica set, specify the
\fBreplSetName\fP and a seed list of set members, as in
the following:
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.sp
.nf
.ft C
<replSetName>/<hostname1><:port>,<hostname2><:port>,<...>
.ft P
.fi
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.sp
You can always connect directly to a single MongoDB instance by
specifying the host and port number directly.
.sp
Changed in version 3.0.0: If you use IPv6 and use the \fB<address>:<port>\fP format, you must
enclose the portion of an address and port combination in
brackets (e.g. \fB[<address>]\fP).

.sp
If connected to a replica set where the \fIprimary\fP is not
reachable, \fBmongotop\fP returns an error message.
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.TP
.B \-\-port <port>
\fIDefault\fP: 27017
.sp
Specifies the TCP port on which the MongoDB instance listens for
client connections.
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.TP
.B \-\-ipv6
Enables IPv6 support and allows the \fBmongotop\fP to connect to the
MongoDB instance using an IPv6 network. All MongoDB programs and
processes disable IPv6 support by default.
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.TP
.B \-\-ssl
New in version 2.6.

.sp
Enables connection to a \fBmongod\fP or \fBmongos\fP that has
SSL support enabled.
.sp
The default distribution of MongoDB does not contain support for SSL.
For more information on MongoDB and SSL, see http://docs.mongodb.org/manual/tutorial/configure\-ssl\&.
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.TP
.B \-\-sslCAFile <filename>
New in version 2.6.

.sp
Specifies the \fB\&.pem\fP file that contains the root certificate chain
from the Certificate Authority. Specify the file name of the
\fB\&.pem\fP file using relative or absolute paths.
.sp
The default distribution of MongoDB does not contain support for SSL.
For more information on MongoDB and SSL, see http://docs.mongodb.org/manual/tutorial/configure\-ssl\&.
.sp
\fBWARNING:\fP
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If the \fBmongo\fP shell or any other tool that connects to
\fBmongos\fP or \fBmongod\fP is run without
\fI\-\-sslCAFile\fP, it will not attempt to validate
server certificates. This results in vulnerability to expired
\fBmongod\fP and \fBmongos\fP certificates as well as to foreign
processes posing as valid \fBmongod\fP or \fBmongos\fP
instances. Ensure that you \fIalways\fP specify the CA file against which
server certificates should be validated in cases where intrusion is a
possibility.
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.TP
.B \-\-sslPEMKeyFile <filename>
New in version 2.6.

.sp
Specifies the \fB\&.pem\fP file that contains both the SSL certificate
and key. Specify the file name of the \fB\&.pem\fP file using relative
or absolute paths.
.sp
This option is required when using the \fI\%\-\-ssl\fP option to connect
to a \fBmongod\fP or \fBmongos\fP that has
\fBCAFile\fP enabled \fIwithout\fP
\fBallowConnectionsWithoutCertificates\fP\&.
.sp
The default distribution of MongoDB does not contain support for SSL.
For more information on MongoDB and SSL, see http://docs.mongodb.org/manual/tutorial/configure\-ssl\&.
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.TP
.B \-\-sslPEMKeyPassword <value>
New in version 2.6.

.sp
Specifies the password to de\-crypt the certificate\-key file (i.e.
\fI\%\-\-sslPEMKeyFile\fP). Use the \fI\%\-\-sslPEMKeyPassword\fP option only if the
certificate\-key file is encrypted. In all cases, the \fBmongotop\fP will
redact the password from all logging and reporting output.
.sp
If the private key in the PEM file is encrypted and you do not specify
the \fI\%\-\-sslPEMKeyPassword\fP option, the \fBmongotop\fP will prompt for a passphrase. See
\fIssl\-certificate\-password\fP\&.
.sp
The default distribution of MongoDB does not contain support for SSL.
For more information on MongoDB and SSL, see http://docs.mongodb.org/manual/tutorial/configure\-ssl\&.
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.TP
.B \-\-sslCRLFile <filename>
New in version 2.6.

.sp
Specifies the \fB\&.pem\fP file that contains the Certificate Revocation
List. Specify the file name of the \fB\&.pem\fP file using relative or
absolute paths.
.sp
The default distribution of MongoDB does not contain support for SSL.
For more information on MongoDB and SSL, see http://docs.mongodb.org/manual/tutorial/configure\-ssl\&.
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.TP
.B \-\-sslAllowInvalidCertificates
New in version 2.6.

.sp
Bypasses the validation checks for server certificates and allows
the use of invalid certificates. When using the
\fBallowInvalidCertificates\fP setting, MongoDB logs as a
warning the use of the invalid certificate.
.sp
The default distribution of MongoDB does not contain support for SSL.
For more information on MongoDB and SSL, see http://docs.mongodb.org/manual/tutorial/configure\-ssl\&.
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.TP
.B \-\-sslAllowInvalidHostnames
New in version 3.0.

.sp
Disables the validation of the hostnames in SSL certificates. Allows
\fBmongotop\fP to connect to MongoDB instances if the hostname their
certificates do not match the specified hostname.
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.TP
.B \-\-sslFIPSMode
New in version 2.6.

.sp
Directs the \fBmongotop\fP to use the FIPS mode of the installed OpenSSL
library. Your system must have a FIPS compliant OpenSSL library to use
the \fI\%\-\-sslFIPSMode\fP option.
.sp
\fBNOTE:\fP
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FIPS Compatible SSL is
available only in \fI\%MongoDB Enterprise\fP\&. See
http://docs.mongodb.org/manual/tutorial/configure\-fips for more information.
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.TP
.B \-\-username <username>, \-u <username>
Specifies a username with which to authenticate to a MongoDB database
that uses authentication. Use in conjunction with the \fB\-\-password\fP and
\fB\-\-authenticationDatabase\fP options.
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.B \-\-password <password>, \-p <password>
Specifies a password with which to authenticate to a MongoDB database
that uses authentication. Use in conjunction with the \fB\-\-username\fP and
\fB\-\-authenticationDatabase\fP options.
.sp
If you do not specify an argument for \fI\%\-\-password\fP, \fBmongotop\fP will
prompt interactively for a password on the console.
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.B \-\-authenticationDatabase <dbname>
New in version 2.4.

.sp
Specifies the database that holds the user\(aqs credentials.
.sp
Changed in version 3.0.0: \fI\%\-\-authenticationDatabase\fP is required for \fBmongod\fP
and \fBmongos\fP instances that use \fIauthentication\fP\&.

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.B \-\-authenticationMechanism <name>
\fIDefault\fP: MONGODB\-CR
.sp
New in version 2.4.

.sp
Changed in version 2.6: Added support for the \fBPLAIN\fP and \fBMONGODB\-X509\fP authentication
mechanisms.

.sp
Specifies the authentication mechanism the \fBmongotop\fP instance uses to
authenticate to the \fBmongod\fP or \fBmongos\fP\&.
.TS
center;
|l|l|.
_
T{
Value
T}	T{
Description
T}
_
T{
MONGODB\-CR
T}	T{
MongoDB challenge/response authentication.
T}
_
T{
MONGODB\-X509
T}	T{
MongoDB SSL certificate authentication.
T}
_
T{
PLAIN
T}	T{
External authentication using LDAP. You can also use \fBPLAIN\fP
for authenticating in\-database users. \fBPLAIN\fP transmits
passwords in plain text. This mechanism is available only in
\fI\%MongoDB Enterprise\fP\&.
T}
_
T{
GSSAPI
T}	T{
External authentication using Kerberos. This mechanism is
available only in \fI\%MongoDB Enterprise\fP\&.
T}
_
.TE
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.TP
.B \-\-gssapiServiceName
New in version 2.6.

.sp
Specify the name of the service using \fBGSSAPI/Kerberos\fP\&. Only required if the service does not use the
default name of \fBmongodb\fP\&.
.sp
This option is available only in MongoDB Enterprise.
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.B \-\-gssapiHostName
New in version 2.6.

.sp
Specify the hostname of a service using \fBGSSAPI/Kerberos\fP\&. \fIOnly\fP required if the hostname of a machine does
not match the hostname resolved by DNS.
.sp
This option is available only in MongoDB Enterprise.
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.TP
.B \-\-locks
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.
.sp
\fI\%\-\-locks\fP returns an error when called against a \fBmongod\fP instance
that does not report lock usage.
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.B \-\-rowcount int, \-n int
Number of lines of data that \fBmongotop\fP should print. "0 for indefinite"
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.B \-\-json
New in version 3.0.0.

.sp
Returns output for \fBmongotop\fP in \fIJSON\fP format.
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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 \fImongotop \-\-locks\fP, the \fBns\fP field does not
appear in the \fBmongotop\fP output.

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.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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.B mongotop.total
Provides the total amount of time that this \fBmongod\fP spent
operating on this namespace.
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.B mongotop.read
Provides the amount of time that this \fBmongod\fP spent
performing read operations on this namespace.
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.B mongotop.write
Provides the amount of time that this \fBmongod\fP spent
performing write operations on this namespace.
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.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
                     ns    total    read    write          2014\-12\-19T15:32:01\-05:00
     admin.system.roles      0ms     0ms      0ms
   admin.system.version      0ms     0ms      0ms
               local.me      0ms     0ms      0ms
         local.oplog.rs      0ms     0ms      0ms
 local.replset.minvalid      0ms     0ms      0ms
      local.startup_log      0ms     0ms      0ms
   local.system.indexes      0ms     0ms      0ms
local.system.namespaces      0ms     0ms      0ms
   local.system.replset      0ms     0ms      0ms

                     ns    total    read    write          2014\-12\-19T15:47:01\-05:00
     admin.system.roles      0ms     0ms      0ms
   admin.system.version      0ms     0ms      0ms
               local.me      0ms     0ms      0ms
         local.oplog.rs      0ms     0ms      0ms
 local.replset.minvalid      0ms     0ms      0ms
      local.startup_log      0ms     0ms      0ms
   local.system.indexes      0ms     0ms      0ms
local.system.namespaces      0ms     0ms      0ms
   local.system.replset      0ms     0ms      0ms
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
The output varies depending on your MongoDB setup. For example,
\fBlocal.system.indexes\fP and \fBlocal.system.namespaces\fP only appear
for \fBmongod\fP instances using the \fIMMAPv1\fP
storage engine.
.sp
To return a \fBmongotop\fP report every 5 minutes, use the
following command:
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.sp
.nf
.ft C
mongotop 300
.ft P
.fi
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.sp
To report the use of per\-database locks, use \fI\%\-\-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
.UNINDENT
.UNINDENT
.sp
Changed in version 3.0.0: When called against a \fBmongod\fP that does not report lock
usage, \fI\%\-\-locks\fP will return a \fBFailed: Server does not
support reporting locking information\fP error.

.SH AUTHOR
MongoDB Documentation Project
.SH COPYRIGHT
2011-2015
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