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.TH "MONGOSTAT" "1" "Jun 21, 2018" "4.0" "mongodb-manual"
.SH NAME
mongostat \- MongoDB Use Statistics
.
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.SS On this page
.INDENT 0.0
.IP \(bu 2
\fI\%Synopsis\fP
.IP \(bu 2
\fI\%Required Access\fP
.IP \(bu 2
\fI\%Options\fP
.IP \(bu 2
\fI\%Fields\fP
.IP \(bu 2
\fI\%Use\fP
.UNINDENT
.INDENT 0.0
.INDENT 3.5
.IP "Mac OSX Sierra and Go 1.6 Incompatibility"
.sp
Users running on Mac OSX Sierra require the 3.2.10 or newer version
of mongostat\&.
.UNINDENT
.UNINDENT
.SH SYNOPSIS
.sp
The \fI\%mongostat\fP utility provides a quick overview of the
status of a currently running \fBmongod\fP
or \fBmongos\fP
instance. \fI\%mongostat\fP is functionally similar to the
UNIX/Linux file system utility \fBvmstat\fP, but provides data regarding
\fBmongod\fP and \fBmongos\fP instances.
.sp
Run \fI\%mongostat\fP from the system command line, not the \fBmongo\fP shell.
.sp
\fBSEE ALSO:\fP
.INDENT 0.0
.INDENT 3.5
For more information about monitoring MongoDB, see
/administration/monitoring\&.
.sp
For more background on other MongoDB status outputs see:
.INDENT 0.0
.IP \(bu 2
/reference/command/serverStatus
.IP \(bu 2
/reference/command/replSetGetStatus
.IP \(bu 2
/reference/command/dbStats
.IP \(bu 2
/reference/command/collStats
.UNINDENT
.sp
For an additional utility that provides MongoDB metrics see
mongotop\&.
.UNINDENT
.UNINDENT
.SH REQUIRED ACCESS
.sp
In order to connect to a \fBmongod\fP that enforces authorization
with the \fB\-\-auth\fP option, specify the
\fI\%\-\-username\fP and \fI\%\-\-password\fP options, and the connecting user must have the
\fBserverStatus\fP privilege action on the cluster resources.
.sp
The built\-in role \fBclusterMonitor\fP provides this privilege as
well as other privileges. To create a role with just the privilege to
run \fI\%mongostat\fP, see create\-role\-for\-mongostat\&.
.SH OPTIONS
.INDENT 0.0
.TP
.B mongostat
.UNINDENT
.INDENT 0.0
.TP
.B \-\-help
Returns information on the options and use of \fBmongostat\fP\&.
.UNINDENT
.INDENT 0.0
.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
.INDENT 0.0
.TP
.B \-\-version
Returns the \fBmongostat\fP release number.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-uri <connectionString>
New in version 3.4.6.
.sp
Specify a resolvable URI
connection string for the \fBmongod\fP to which to
connect.
.sp
The following is the standard
URI connection scheme:
.INDENT 7.0
.INDENT 3.5
.sp
.nf
.ft C
mongodb://[username:password@]host1[:port1][,host2[:port2],...[,hostN[:portN]]][/[database][?options]]
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
For detailed explanations of the components of this string, refer to
the
Connection String URI Format
documentation.
.sp
\fBIMPORTANT:\fP
.INDENT 7.0
.INDENT 3.5
The following \fI\%mongostat\fP options are incompatible with the
\fB\-\-uri\fP option. Instead, specify these options as part of your
\fB\-\-uri\fP connection string when applicable:
.INDENT 0.0
.IP \(bu 2
\fB\-\-host\fP
.IP \(bu 2
\fB\-\-port\fP
.IP \(bu 2
\fB\-\-db\fP
.IP \(bu 2
\fB\-\-username\fP
.IP \(bu 2
\fB\-\-password\fP (when specifying the password as part of the
URI connection string)
.IP \(bu 2
\fB\-\-authenticationDatabase\fP
.IP \(bu 2
\fB\-\-authenticationMechanism\fP
.UNINDENT
.UNINDENT
.UNINDENT
.UNINDENT
.INDENT 0.0
.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 \fBmongostat\fP attempts to connect to a MongoDB
instance running on the localhost on port number \fB27017\fP\&.
.sp
To connect to a replica set, you can specify the set member or
members to report on, as in the following (see also the
\fB\-\-discover\fP flag):
.INDENT 7.0
.INDENT 3.5
.sp
.nf
.ft C
\-\-host <hostname1><:port>,<hostname2><:port>,<...>
.ft P
.fi
.UNINDENT
.UNINDENT
.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).
.UNINDENT
.INDENT 0.0
.TP
.B \-\-port <port>
\fIDefault\fP: 27017
.sp
Specifies the TCP port on which the MongoDB instance listens for
client connections.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-ipv6
\fIRemoved in version 3.0.\fP
.sp
Enables IPv6 support and allows \fBmongostat\fP to connect to the
MongoDB instance using an IPv6 network. Prior to MongoDB 3.0, you
had to specify \fI\%\-\-ipv6\fP to use IPv6. In MongoDB 3.0 and later, IPv6
is always enabled.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-ssl
New in version 2.6.
.sp
Enables connection to a \fBmongod\fP or \fBmongos\fP that has
TLS/SSL support enabled.
.sp
For more information about TLS/SSL and MongoDB, see
/tutorial/configure\-ssl and
/tutorial/configure\-ssl\-clients .
.UNINDENT
.INDENT 0.0
.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
Starting in version 3.4, if \fB\-\-sslCAFile\fP or \fBssl.CAFile\fP is not
specified and you are not using x.509 authentication, the
system\-wide CA certificate store will be used when connecting to an
TLS/SSL\-enabled server.
.sp
If using x.509 authentication, \fB\-\-sslCAFile\fP or \fBssl.CAFile\fP
must be specified.
.sp
\fBWARNING:\fP
.INDENT 7.0
.INDENT 3.5
\fBVersion 3.2 and earlier:\fP For TLS/SSL connections (\fB\-\-ssl\fP) to
\fBmongod\fP and \fBmongos\fP, if the \fBmongostat\fP runs without the
\fI\%\-\-sslCAFile\fP, \fBmongostat\fP will not attempt
to validate the server certificates. This creates a 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 to validate the server certificates in cases where
intrusion is a possibility.
.UNINDENT
.UNINDENT
.sp
For more information about TLS/SSL and MongoDB, see
/tutorial/configure\-ssl and
/tutorial/configure\-ssl\-clients .
.UNINDENT
.INDENT 0.0
.TP
.B \-\-sslPEMKeyFile <filename>
New in version 2.6.
.sp
Specifies the \fB\&.pem\fP file that contains both the TLS/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
For more information about TLS/SSL and MongoDB, see
/tutorial/configure\-ssl and
/tutorial/configure\-ssl\-clients .
.UNINDENT
.INDENT 0.0
.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 \fBmongostat\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 \fBmongostat\fP will prompt for a passphrase. See
ssl\-certificate\-password\&.
.sp
For more information about TLS/SSL and MongoDB, see
/tutorial/configure\-ssl and
/tutorial/configure\-ssl\-clients .
.UNINDENT
.INDENT 0.0
.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
For more information about TLS/SSL and MongoDB, see
/tutorial/configure\-ssl and
/tutorial/configure\-ssl\-clients .
.UNINDENT
.INDENT 0.0
.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
Starting in MongoDB 4.0, if you specify
\fB\-\-sslAllowInvalidCertificates\fP or \fBssl.allowInvalidCertificates:
true\fP when using x.509 authentication, an invalid certificate is
only sufficient to establish a TLS/SSL connection but is
\fIinsufficient\fP for authentication.
.sp
\fBWARNING:\fP
.INDENT 7.0
.INDENT 3.5
For TLS/SSL connections to \fBmongod\fP and
\fBmongos\fP, avoid using
\fB\-\-sslAllowInvalidCertificates\fP if possible and only use
\fB\-\-sslAllowInvalidCertificates\fP on systems where intrusion is
not possible.
.sp
If the \fBmongo\fP shell (and other
mongodb\-tools\-support\-ssl) runs with the
\fB\-\-sslAllowInvalidCertificates\fP option, the
\fBmongo\fP shell (and other
mongodb\-tools\-support\-ssl) will not attempt to validate
the server certificates. This creates a vulnerability to expired
\fBmongod\fP and \fBmongos\fP certificates as
well as to foreign processes posing as valid
\fBmongod\fP or \fBmongos\fP instances.
.UNINDENT
.UNINDENT
.sp
For more information about TLS/SSL and MongoDB, see
/tutorial/configure\-ssl and
/tutorial/configure\-ssl\-clients .
.UNINDENT
.INDENT 0.0
.TP
.B \-\-sslAllowInvalidHostnames
New in version 3.0.
.sp
Disables the validation of the hostnames in TLS/SSL certificates. Allows
\fBmongostat\fP to connect to MongoDB instances even if the hostname in their
certificates do not match the specified hostname.
.sp
For more information about TLS/SSL and MongoDB, see
/tutorial/configure\-ssl and
/tutorial/configure\-ssl\-clients .
.UNINDENT
.INDENT 0.0
.TP
.B \-\-sslFIPSMode
New in version 2.6.
.sp
Directs the \fBmongostat\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
.INDENT 7.0
.INDENT 3.5
FIPS\-compatible TLS/SSL is
available only in \fI\%MongoDB Enterprise\fP\&. See
/tutorial/configure\-fips for more information.
.UNINDENT
.UNINDENT
.UNINDENT
.INDENT 0.0
.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.
.UNINDENT
.INDENT 0.0
.TP
.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
Changed in version 3.0.0: If you do not specify an argument for \fI\%\-\-password\fP, \fBmongostat\fP returns
an error.
.sp
Changed in version 3.0.2: If you wish \fBmongostat\fP to prompt the user
for the password, pass the \fI\%\-\-username\fP option without
\fI\%\-\-password\fP or specify an empty string as the \fI\%\-\-password\fP value,
as in \fB\-\-password ""\fP .
.UNINDENT
.INDENT 0.0
.TP
.B \-\-authenticationDatabase <dbname>
Specifies the database in which the user is created.
See user\-authentication\-database\&.
.sp
\fI\%\-\-authenticationDatabase\fP is required for \fBmongod\fP
and \fBmongos\fP instances that use authentication\&.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-authenticationMechanism <name>
\fIDefault\fP: SCRAM\-SHA\-1
.sp
Specifies the authentication mechanism the \fBmongostat\fP instance uses to
authenticate to the \fBmongod\fP or \fBmongos\fP\&.
.sp
Changed in version 4.0: MongoDB removes support for the deprecated MongoDB
Challenge\-Response (\fBMONGODB\-CR\fP) authentication mechanism.
.sp
MongoDB adds support for SCRAM mechanism using the SHA\-256 hash
function (\fBSCRAM\-SHA\-256\fP).
.TS
center;
|l|l|.
_
T{
Value
T} T{
Description
T}
_
T{
SCRAM\-SHA\-1
T} T{
\fI\%RFC 5802\fP standard
Salted Challenge Response Authentication Mechanism using the SHA\-1
hash function.
T}
_
T{
SCRAM\-SHA\-256
T} T{
\fI\%RFC 7677\fP standard
Salted Challenge Response Authentication Mechanism using the SHA\-256
hash function.
.sp
Requires featureCompatibilityVersion set to \fB4.0\fP\&.
.sp
New in version 4.0.
T}
_
T{
MONGODB\-X509
T} T{
MongoDB TLS/SSL certificate authentication.
T}
_
T{
GSSAPI (Kerberos)
T} T{
External authentication using Kerberos. This mechanism is
available only in \fI\%MongoDB Enterprise\fP\&.
T}
_
T{
PLAIN (LDAP SASL)
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}
_
.TE
.UNINDENT
.INDENT 0.0
.TP
.B \-\-gssapiServiceName
New in version 2.6.
.sp
Specify the name of the service using GSSAPI/Kerberos\&. Only required if the service does not use the
default name of \fBmongodb\fP\&.
.sp
This option is available only in MongoDB Enterprise.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-gssapiHostName
New in version 2.6.
.sp
Specify the hostname of a service using GSSAPI/Kerberos\&. \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.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-humanReadable boolean
\fIDefault\fP: True
.sp
New in version 3.4.
.sp
When \fBtrue\fP, \fBmongostat\fP formats dates and quantity values for
easier reading, as in the following sample output:
.INDENT 7.0
.INDENT 3.5
.sp
.nf
.ft C
insert query update delete getmore command dirty used flushes vsize res qrw arw net_in net_out conn time
991 *0 *0 *0 0 2|0 3.4% 4.5% 0 2.90G 297M 0|0 0|0 12.9m 84.2k 2 Oct 6 09:45:37.478
989 *0 *0 *0 0 2|0 3.6% 4.7% 0 2.91G 310M 0|0 0|0 12.9m 84.1k 2 Oct 6 09:45:38.476
988 *0 *0 *0 0 1|0 3.7% 4.8% 0 2.92G 323M 0|0 0|0 12.8m 83.8k 2 Oct 6 09:45:39.481
976 *0 *0 *0 0 2|0 3.9% 5.0% 0 2.94G 335M 0|0 0|0 12.7m 83.7k 2 Oct 6 09:45:40.476
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
When \fBfalse\fP, \fBmongostat\fP returns the raw data, as in the following
sample output:
.INDENT 7.0
.INDENT 3.5
.sp
.nf
.ft C
insert query update delete getmore command dirty used flushes vsize res qrw arw net_in net_out conn time
992 *0 *0 *0 0 2|0 1.3 2.4 0 2941255680 149946368 0|0 0|0 12913607 84271 2 2016\-10\-06T09:45:25\-04:00
989 *0 *0 *0 0 1|0 1.5 2.6 0 2974810112 163577856 0|0 0|0 12873225 84087 2 2016\-10\-06T09:45:26\-04:00
996 *0 *0 *0 0 1|0 1.6 2.8 0 2972712960 177209344 0|0 0|0 12955423 84345 2 2016\-10\-06T09:45:27\-04:00
987 *0 *0 *0 0 1|0 1.8 2.9 0 2989490176 190840832 0|0 0|0 12861852 84008 2 2016\-10\-06T09:45:28\-04:00
.ft P
.fi
.UNINDENT
.UNINDENT
.UNINDENT
.INDENT 0.0
.TP
.B \-o <field list>
New in version 3.4.
.sp
When specified, \fBmongostat\fP includes \fBonly\fP the specified fields
in the \fBmongostat\fP output.
.sp
Use dot notation to specify
\fBserverStatus fields\fP, as in
\fBmetrics.document.inserted\fP\&.
.sp
To specify a custom name for a field, use \fB<field>=<customName>\fP,
as in:
.INDENT 7.0
.INDENT 3.5
.sp
.nf
.ft C
mongostat \-o \(aqhost=H,time=T,version=MongoDB Version\(aq
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
\fI\%\-o\fP supports the following methods to modify the information
returned for a given serverStatus field:
.INDENT 7.0
.TP
.B rate()
Use \fI\%\&.rate()\fP to view the rate per second at which a
serverStatus field is changing from \fI\%mongostat\fP call to
call.
.sp
\fI\%View Rate of Change for a Field with .rate()\fP illustrates how to use
\fI\%mongostat\fP with \fI\%\-o\fP and the \fI\%\&.rate()\fP
method.
.UNINDENT
.INDENT 7.0
.TP
.B diff()
Use \fI\%\&.diff()\fP to view how much a serverStatus field has
changed since the previous \fI\%mongostat\fP call. The interval
between calls is specified by \fB<sleeptime>\fP\&.
.sp
\fI\%View Field Changes with .diff()\fP illustrates how to use
\fI\%mongostat\fP with \fI\%\-o\fP and the \fI\%\&.diff()\fP
method.
.UNINDENT
.sp
\fBmongostat\fP supports specifying \fIeither\fP \fI\%\-o\fP or \fI\%\-O\fP:
you cannot include both options.
.sp
See \fI\%Specify mongostat Output Fields\fP for an example of
\fI\%\-o\fP\&.
.UNINDENT
.INDENT 0.0
.TP
.B \-O <field list>
New in version 3.4.
.sp
When specified, \fBmongostat\fP includes the specified
\fBserverStatus\fP fields after the default \fBmongostat\fP output.
.sp
Use dot notation to specify
\fBserverStatus fields\fP, as in
\fBmetrics.document.inserted\fP\&.
.sp
To specify a custom name for a field, use \fB<field>=<customName>\fP,
as in:
.INDENT 7.0
.INDENT 3.5
.sp
.nf
.ft C
mongostat \-O host=H,time=T
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
\fBmongostat\fP supports specifying \fIeither\fP \fI\%\-O\fP or \fI\%\-o\fP:
you cannot include both options.
.sp
See \fI\%Add Fields to mongostat Output\fP for an example of
\fI\%\-O\fP\&.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-noheaders
Disables the output of column or field names.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-rowcount <number>, \-n <number>
Controls the number of rows to output. Use in conjunction with
the \fBsleeptime\fP argument to control the duration of a
\fI\%mongostat\fP operation.
.sp
Unless \fI\%\-\-rowcount\fP is specified, \fI\%mongostat\fP
will return an infinite number of rows (e.g. value of \fB0\fP\&.)
.UNINDENT
.INDENT 0.0
.TP
.B \-\-discover
Discovers and reports on statistics from all members of a replica
set or sharded cluster\&. When connected to any member of a
replica set, \fI\%\-\-discover\fP all non\-hidden members of the replica set. When connected to a \fBmongos\fP,
\fI\%mongostat\fP will return data from all shards in
the cluster. If a replica set provides a shard in the sharded cluster,
\fI\%mongostat\fP will report on non\-hidden members of that replica
set.
.sp
The \fI\%mongostat \-\-host\fP option is not required but
potentially useful in this case.
.sp
Changed in version 2.6: When running with \fI\%\-\-discover\fP, \fI\%mongostat\fP now
respects \fI\%\-\-rowcount\fP\&.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-http
Configures \fI\%mongostat\fP to collect data using the HTTP interface
rather than a raw database connection.
.sp
Changed in version 3.6: MongoDB 3.6 removes the deprecated HTTP interface and REST API to
MongoDB.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-all
Configures \fI\%mongostat\fP to return all optional \fI\%fields\fP\&.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-json
New in version 3.0.0.
.sp
Returns output for \fBmongostat\fP in JSON format.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-interactive
New in version 3.4.
.sp
Display \fBmongostat\fP output in an interactive non\-scrolling interface
rather than the default scrolling output.
.sp
\fI\%\-\-interactive\fP is not available with the \fI\%\-\-json\fP
option.
.sp
See: \fI\%View Statistics in an Interactive Interface\fP for an example of \fI\%\-\-interactive\fP\&.
.UNINDENT
.INDENT 0.0
.TP
.B <sleeptime>
\fIDefault\fP: 1
.sp
The final \fBmongostat\fP argument is the length of time, in seconds, that
\fI\%mongostat\fP waits in between calls. By default \fI\%mongostat\fP
returns one call every second.
.sp
\fI\%mongostat\fP returns values that reflect the operations
over a 1 second period. For values of \fB<sleeptime>\fP greater
than 1, \fI\%mongostat\fP averages data to reflect average
operations per second.
.UNINDENT
.SH FIELDS
.sp
\fI\%mongostat\fP returns values that reflect the operations over a
1 second period. When \fBmongostat <sleeptime>\fP has a value
greater than 1, \fI\%mongostat\fP averages the statistics to reflect
average operations per second.
.sp
\fI\%mongostat\fP outputs the following fields:
.INDENT 0.0
.TP
.B inserts
The number of objects inserted into the database per second. If
followed by an asterisk (e.g. \fB*\fP), the datum refers to a
replicated operation.
.UNINDENT
.INDENT 0.0
.TP
.B query
The number of query operations per second.
.UNINDENT
.INDENT 0.0
.TP
.B update
The number of update operations per second.
.UNINDENT
.INDENT 0.0
.TP
.B delete
The number of delete operations per second.
.UNINDENT
.INDENT 0.0
.TP
.B getmore
The number of get more (i.e. cursor batch) operations per second.
.UNINDENT
.INDENT 0.0
.TP
.B command
The number of commands per second. On
secondary systems, \fI\%mongostat\fP presents two values
separated by a pipe character (e.g. \fB|\fP), in the form of
\fBlocal|replicated\fP commands.
.UNINDENT
.INDENT 0.0
.TP
.B flushes
Changed in version 3.0.
.sp
For the storage\-wiredtiger, \fBflushes\fP refers to the number
of WiredTiger checkpoints triggered between each polling interval.
.sp
For the storage\-mmapv1, \fBflushes\fP represents the number of
fsync operations per second.
.UNINDENT
.INDENT 0.0
.TP
.B dirty
New in version 3.0.
.sp
Only for storage\-wiredtiger\&. The percentage of the WiredTiger
cache with dirty bytes, calculated by
\fBwiredTiger.cache.tracked dirty bytes in the cache\fP
/ \fBwiredTiger.cache.maximum bytes configured\fP\&.
.UNINDENT
.INDENT 0.0
.TP
.B used
New in version 3.0.
.sp
Only for storage\-wiredtiger\&. The percentage of the WiredTiger
cache that is in use, calculated by
\fBwiredTiger.cache.bytes currently in the cache\fP /
\fBwiredTiger.cache.maximum bytes configured\fP\&.
.UNINDENT
.INDENT 0.0
.TP
.B mapped
Changed in version 3.0.
.sp
Only for storage\-mmapv1\&. The total amount of data mapped in
megabytes. This is the total data size at the time of the last
\fI\%mongostat\fP call.
.UNINDENT
.INDENT 0.0
.TP
.B vsize
The amount of virtual memory in megabytes used by the process at
the time of the last \fI\%mongostat\fP call.
.UNINDENT
.INDENT 0.0
.TP
.B non\-mapped
Changed in version 3.0.
.sp
Only for storage\-mmapv1\&.
.sp
\fIOptional\fP\&. The total amount of virtual memory excluding all mapped memory at
the time of the last \fI\%mongostat\fP call.
.sp
\fI\%mongostat\fP only returns this value when started with the
\fI\%\-\-all\fP option.
.UNINDENT
.INDENT 0.0
.TP
.B res
The amount of resident memory in megabytes used by the process at
the time of the last \fI\%mongostat\fP call.
.UNINDENT
.INDENT 0.0
.TP
.B faults
Changed in version 3.0.
.sp
Only for storage\-mmapv1\&. The number of page faults per second.
.sp
Changed in version 2.1: Before version 2.1, this value was only provided for MongoDB
instances running on Linux hosts.
.UNINDENT
.INDENT 0.0
.TP
.B lr
New in version 3.2.
.sp
Only for storage\-mmapv1\&. The percentage of read lock
acquisitions that had to wait. \fI\%mongostat\fP displays \fBlr|lw\fP
if a lock acquisition waited.
.UNINDENT
.INDENT 0.0
.TP
.B lw
New in version 3.2.
.sp
Only for storage\-mmapv1\&. The percentage of write lock
acquisitions that had to wait. \fI\%mongostat\fP displays \fBlr|lw\fP
if a lock acquisition waited.
.UNINDENT
.INDENT 0.0
.TP
.B lrt
New in version 3.2.
.sp
Only for storage\-mmapv1\&. The average acquire time, in
microseconds, of read lock acquisitions that waited.
\fI\%mongostat\fP displays \fBlrt|lwt\fP if a lock acquisition
waited.
.UNINDENT
.INDENT 0.0
.TP
.B lwt
New in version 3.2.
.sp
Only for storage\-mmapv1\&. The average acquire time, in
microseconds, of write lock acquisitions that waited.
\fI\%mongostat\fP displays \fBlrt|lwt\fP if a lock acquisition
waited.
.UNINDENT
.INDENT 0.0
.TP
.B locked
Changed in version 3.0: Only appears when \fI\%mongostat\fP runs against pre\-3.0
versions of MongoDB instances.
.sp
The percent of time in a global write lock.
.UNINDENT
.INDENT 0.0
.TP
.B idx miss
Changed in version 3.0.
.sp
Only for storage\-mmapv1\&. The percent of index access attempts
that required a page fault to load a btree node. This is a sampled
value.
.UNINDENT
.INDENT 0.0
.TP
.B qr
The length of the queue of clients waiting to read data from the
MongoDB instance.
.UNINDENT
.INDENT 0.0
.TP
.B qw
The length of the queue of clients waiting to write data from the
MongoDB instance.
.UNINDENT
.INDENT 0.0
.TP
.B ar
The number of active clients performing read operations.
.UNINDENT
.INDENT 0.0
.TP
.B aw
The number of active clients performing write operations.
.UNINDENT
.INDENT 0.0
.TP
.B netIn
The amount of network traffic, in \fIbytes\fP, received by the MongoDB instance.
.sp
This includes traffic from \fI\%mongostat\fP itself.
.UNINDENT
.INDENT 0.0
.TP
.B netOut
The amount of network traffic, in \fIbytes\fP, sent by the MongoDB instance.
.sp
This includes traffic from \fI\%mongostat\fP itself.
.UNINDENT
.INDENT 0.0
.TP
.B conn
The total number of open connections.
.UNINDENT
.INDENT 0.0
.TP
.B set
The name, if applicable, of the replica set.
.UNINDENT
.INDENT 0.0
.TP
.B repl
The replication status of the member.
.TS
center;
|l|l|.
_
T{
\fBValue\fP
T} T{
\fBReplication Type\fP
T}
_
T{
M
T} T{
master
T}
_
T{
SEC
T} T{
secondary
T}
_
T{
REC
T} T{
recovering
T}
_
T{
UNK
T} T{
unknown
T}
_
T{
RTR
T} T{
mongos process (“router”)
T}
_
T{
ARB
T} T{
arbiter
T}
_
.TE
.UNINDENT
.SH USE
.SS Specify \fBmongostat\fP Collection Period and Frequency
.sp
In the first example, \fI\%mongostat\fP will return data every
second for 20 seconds. \fI\%mongostat\fP collects data from the
\fBmongod\fP instance running on the localhost interface on
port 27017. All of the following invocations produce identical
behavior:
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
mongostat \-\-rowcount 20 1
mongostat \-\-rowcount 20
mongostat \-n 20 1
mongostat \-n 20
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
In the next example, \fI\%mongostat\fP returns data every 5 minutes
(or 300 seconds) for as long as the program runs. \fI\%mongostat\fP
collects data from the \fBmongod\fP instance running on the
localhost interface on port \fB27017\fP\&. The following
invocations produce identical behavior:
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
mongostat \-\-rowcount 0 300
mongostat \-n 0 300
mongostat 300
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
In the following example, \fI\%mongostat\fP returns data every 5
minutes for an hour (12 times.) \fI\%mongostat\fP collects data
from the \fBmongod\fP instance running on the localhost interface
on port 27017. The following invocations produce identical
behavior:
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
mongostat \-\-rowcount 12 300
mongostat \-n 12 300
.ft P
.fi
.UNINDENT
.UNINDENT
.SS Add Fields to \fI\%mongostat\fP Output
.sp
New in version 3.4.
.sp
\fI\%\-O\fP allows you to specify fields from
\fBserverStatus\fP output to add to the default
\fI\%mongostat\fP output. The following example adds the \fBhost\fP
and \fBversion\fP fields as well as the \fBnetwork.numRequests\fP field,
which will display as “network requests”, to the default
\fI\%mongostat\fP output:
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
mongostat \-O \(aqhost,version,network.numRequests=network requests\(aq
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
The \fI\%mongostat\fP output would then resemble:
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
insert query update delete getmore command dirty used flushes vsize res qrw arw net_in net_out conn time host version network requests
*0 *0 *0 *0 0 2|0 0.0% 0.0% 0 2.51G 19.0M 0|0 0|0 158b 39.4k 2 Oct 11 12:14:45.878 localhost:37017 3.3.14 91
*0 *0 *0 *0 0 1|0 0.0% 0.0% 0 2.51G 19.0M 0|0 0|0 157b 39.3k 2 Oct 11 12:14:46.879 localhost:37017 3.3.14 95
*0 *0 *0 *0 0 1|0 0.0% 0.0% 0 2.51G 19.0M 0|0 0|0 157b 39.2k 2 Oct 11 12:14:47.884 localhost:37017 3.3.14 99
.ft P
.fi
.UNINDENT
.UNINDENT
.SS Specify \fI\%mongostat\fP Output Fields
.sp
New in version 3.4.
.sp
\fI\%\-o\fP specifies the columns \fI\%mongostat\fP includes in its
output. You can specify any \fBserverStatus\fP field as a
\fI\%mongostat\fP output column. The following example specifies the
\fBhost\fP, \fBtime\fP, and \fBmetrics.document.inserted\fP fields:
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
mongostat \-o \(aqhost,time,metrics.document.inserted\(aq
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
The \fI\%mongostat\fP output would then resemble:
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
host time metrics.document.inserted
localhost:37017 Oct 11 12:21:17.370 0
localhost:37017 Oct 11 12:21:18.371 0
localhost:37017 Oct 11 12:21:19.371 0
localhost:37017 Oct 11 12:21:20.368 0
.ft P
.fi
.UNINDENT
.UNINDENT
.SS View Rate of Change for a Field with \fI\%\&.rate()\fP
.sp
New in version 3.4.
.sp
\fI\%\&.rate()\fP enables you to view the rate per second at which a
numerical field has changed from one \fI\%mongostat\fP call to the
next. For example, you can view the rate at which documents have been
inserted during an insert operation. \fI\%\&.rate()\fP can therefore
help you view the performance of your \fBmongod\fP instance.
.sp
The following example reports on the rate of change of the
\fBmetrics.document.inserted\fP \fBserverStatus\fP field. The
invocation uses \fI\%\-o\fP’s ability to specify the name of an column
to label \fBmetrics.document.inserted.rate()\fP as “inserted rate” and
\fBmetrics.document.inserted\fP as “inserted”:
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
mongostat \-o \(aqhost,mem,bits,metrics.document.inserted.rate()=inserted rate,metrics.document.inserted=inserted\(aq \-\-rowcount 5
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
The output would then resemble:
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
host mem.bits inserted rate inserted
localhost:37017 64 501 3455
localhost:37017 64 967 13128
localhost:37017 64 972 22851
localhost:37017 64 214 25000
localhost:37017 64 0 25000
.ft P
.fi
.UNINDENT
.UNINDENT
.SS View Field Changes with \fI\%\&.diff()\fP
.sp
New in version 3.4.
.sp
\fI\%\&.diff()\fP returns the difference between the current
\fBserverStatus\fP field value and the value from the previous
\fI\%mongostat\fP call. The following example returns statistics on
the number of documents being inserted into a collection: \fBinserted
diff\fP is the difference in the
\fBmetrics.document.inserted\fP field between subsequent
calls, while \fBinserted\fP is the value of
\fBmetrics.document.inserted\fP:
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
mongostat \-o \(aqhost,mem.bits,metrics.document.inserted.diff()=inserted diff,metrics.document.inserted=inserted\(aq \-\-rowcount 5
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
The output would then resemble:
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
host mem.bits inserted diff inserted
localhost:27017 64 0 25359
localhost:27017 64 94 25453
localhost:27017 64 938 26391
localhost:27017 64 964 27355
localhost:27017 64 978 28333
.ft P
.fi
.UNINDENT
.UNINDENT
.SS View Statistics for a Replica Set or Sharded Cluster
.sp
In many cases, using the \fI\%\-\-discover\fP option
will help provide a more complete snapshot of the state of an entire
group of machines. If a \fBmongos\fP process connected to a
sharded cluster is running on port \fB27017\fP of the local
machine, you can use the following form to return statistics from all
members of the cluster:
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
mongostat \-\-discover
.ft P
.fi
.UNINDENT
.UNINDENT
.SS View Statistics in an Interactive Interface
.sp
New in version 3.4.
.sp
Use the \fI\%\-\-interactive\fP option to
view statistics in a non\-scrolling \fI\%ncurses\fP \-style
interactive output. The \fI\%\-\-interactive\fP option lets you highlight specific
hosts, columns, or fields to view. When combined with \fI\%\-\-discover\fP,
\fI\%\-\-interactive\fP displays statistics for all members of a
replica set or sharded cluster, as in the following example:
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
mongostat \-\-discover \-\-interactive
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
The output for a sharded cluster would then resemble:
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
host insert query update delete getmore command dirty used flushes mapped vsize res faults qrw arw net_in net_out conn set repl time
hostname.local:27018 *0 *0 *0 *0 0 1|0 0.0% 0.0% 0 3.25G 25.0M n/a 0|0 1|0 157b 43.9k 19 tic PRI Nov 2 11:44:46.439
hostname.local:27019 *0 *0 *0 *0 0 2|0 0.0% 0.0% 0 3.18G 26.0M n/a 0|0 1|0 322b 44.4k 12 tic SEC Nov 2 11:44:46.439
hostname.local:27020 *0 *0 *0 *0 0 2|0 0.0% 0.0% 0 3.18G 26.0M n/a 0|0 1|0 322b 44.4k 12 tic SEC Nov 2 11:44:46.439
hostname.local:27021 2017 *0 *0 *0 826 1029|0 0.0% 0.0% 0 3.25G 31.0M n/a 0|0 1|0 1.74m 1.60m 20 tac PRI Nov 2 11:44:46.439
hostname.local:27022 *2021 *0 *0 *0 0 2|0 0.0% 0.0% 0 3.19G 32.0M n/a 0|0 1|0 322b 44.6k 12 tac SEC Nov 2 11:44:46.438
hostname.local:27023 *2022 *0 *0 *0 0 3|0 0.0% 0.0% 0 3.19G 33.0M n/a 0|0 1|0 323b 44.7k 12 tac SEC Nov 2 11:44:46.438
localhost:27017 2071 *0 *0 *0 0 2073|0 0 0B 2.43G 9.00M 0 0|0 0|0 249k 130k 4 RTR Nov 2 11:44:47.429
Press \(aq?\(aq to toggle help
.ft P
.fi
.UNINDENT
.UNINDENT
.SH AUTHOR
MongoDB Documentation Project
.SH COPYRIGHT
2008-2018
.\" Generated by docutils manpage writer.
.
