path: root/debian/mongostat.1

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.TH "MONGOSTAT" "1" "October 03, 2013" "2.4" "mongodb-manual"
.SH NAME
mongostat \- MongoDB
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.SH SYNOPSIS
.sp
The \fBmongostat\fP utility provides a quick overview of the
status of a currently running \fBmongod\fP
or \fBmongos\fP
instance. \fBmongostat\fP is functionally similar to the
UNIX/Linux file system utility \fBvmstat\fP, but provides data regarding
\fBmongod\fP and \fBmongos\fP instances.
.sp
\fBSEE ALSO:\fP
.INDENT 0.0
.INDENT 3.5
For more information about monitoring MongoDB, see
http://docs.mongodb.org/manual/administration/monitoring\&.
.sp
For more 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
\fBmongotop\fP\&.
.UNINDENT
.UNINDENT
.sp
\fBmongostat\fP connects to the \fBmongod\fP instance running
on the local host interface on TCP port \fB27017\fP; however,
\fBmongostat\fP can connect to any accessible remote \fBmongod\fP
instance.
.SH OPTIONS
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.TP
.B mongostat
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.TP
.B mongostat
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.TP
.B \-\-help
Returns a basic help and usage text.
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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\&.)
.UNINDENT
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.TP
.B \-\-version
Returns the version of the \fBmongostat\fP utility.
.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 \fBmongostat\fP attempts to connect
to a MongoDB instance 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 \fImongostat \-\-host\fP command.
.UNINDENT
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.TP
.B \-\-ipv6
Enables IPv6 support that allows \fBmongostat\fP to connect
to the MongoDB instance using an IPv6 network. All MongoDB programs
and processes, including \fBmongostat\fP, disable IPv6
support by default.
.UNINDENT
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.TP
.B \-\-ssl
New in version 2.4: MongoDB added support for SSL connections to \fBmongod\fP
instances in mongostat\&.

.sp
\fBNOTE:\fP
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SSL support in mongostat is not compiled into the default
distribution of MongoDB. See
http://docs.mongodb.org/manual/tutorial/configure\-ssl for more information on SSL
and MongoDB.
.sp
Additionally, mongostat does not support connections to
\fBmongod\fP instances that require client certificate
validation.
.UNINDENT
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.sp
Allows \fBmongostat\fP to connect to \fBmongod\fP
instance over an SSL connection.
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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
\fImongostat \-\-password\fP option to supply a password.
.sp
\fBIMPORTANT:\fP
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.INDENT 3.5
This user must have sufficient credentials to run
the \fBserverStatus\fP command, which is the
\fBclusterAdmin\fP role. See
http://docs.mongodb.org/manual/reference/user\-privileges and
http://docs.mongodb.org/manual/reference/privilege\-documents for more information.
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.B \-\-password <password>, \-p <password>
Specifies a password to authenticate to the MongoDB instance. Use
in conjunction with the \fImongostat \-\-username\fP option to
supply a username.
.sp
If you specify a \fI\-\-username\fP, and do do not pass an
argument to \fI\-\-password\fP, \fBmongostat\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, \fBmongostat\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,
\fBmongostat\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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.B \-\-noheaders
Disables the output of column or field names.
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.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
\fBmongostat\fP operation.
.sp
Unless \fI\%--rowcount\fP is specified, \fBmongostat\fP
will return an infinite number
of rows (e.g. value of \fB0\fP\&.)
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.TP
.B \-\-http
Configures \fBmongostat\fP to collect data using the HTTP interface
rather than a raw database connection.
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.TP
.B \-\-discover
With this option \fBmongostat\fP discovers and reports on
statistics from all members of a \fIreplica set\fP or
\fIsharded cluster\fP\&. When connected to any member of a replica
set, \fI\%--discover\fP all non\-\fIhidden members\fP of the replica set. When connected to a \fBmongos\fP,
\fBmongostat\fP will return data from all \fIshards\fP in the cluster. If a replica set provides a shard in the
sharded cluster, \fBmongostat\fP will report on non\-hidden
members of that replica set.
.sp
The \fImongostat \-\-host\fP option is not required but
potentially useful in this case.
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.B \-\-all
Configures \fBmongostat\fP to return all optional \fI\%fields\fP\&.
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.TP
.B <sleeptime>
The final argument is the length of time, in seconds, that
\fBmongostat\fP waits in between calls. By default \fBmongostat\fP
returns one call every second.
.sp
\fBmongostat\fP returns values that reflect the operations
over a 1 second period. For values of \fB<sleeptime>\fP greater
than 1, \fBmongostat\fP averages data to reflect average
operations per second.
.UNINDENT
.SH FIELDS
.sp
\fBmongostat\fP returns values that reflect the operations over a
1 second period. When \fBmongostat <sleeptime>\fP has a value
greater than 1, \fBmongostat\fP averages the statistics to reflect
average operations per second.
.sp
\fBmongostat\fP outputs the following fields:
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.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.
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.TP
.B query
The number of query operations per second.
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.B update
The number of update operations per second.
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.B delete
The number of delete operations per second.
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.B getmore
The number of get more (i.e. cursor batch) operations per second.
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.B command
The number of commands per second. On \fIslave\fP and
\fIsecondary\fP systems, \fBmongostat\fP presents two values
separated by a pipe character (e.g. \fB|\fP), in the form of
\fBlocal|replicated\fP commands.
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.B flushes
The number of \fIfsync\fP operations per second.
.UNINDENT
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.B mapped
The total amount of data mapped in megabytes. This is the total
data size at the time of the last \fBmongostat\fP call.
.UNINDENT
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.B size
The amount of (virtual) memory in megabytes used by the process at
the time of the last \fBmongostat\fP call.
.UNINDENT
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.B res
The amount of (resident) memory in megabytes used by the process at
the time of the last \fBmongostat\fP call.
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.B faults
Changed in version 2.1.

.sp
The number of page faults per second.
.sp
Before version 2.1 this value was only provided for MongoDB
instances running on Linux hosts.
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.B locked
The percent of time in a global write lock.
.sp
Changed in version 2.2: The \fBlocked db\fP field replaces the \fBlocked %\fP field to
more appropriate data regarding the database specific locks in
version 2.2.

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.B locked db
New in version 2.2.

.sp
The percent of time in the per\-database context\-specific
lock. \fBmongostat\fP will report the database that has spent
the most time since the last \fBmongostat\fP call with a write
lock.
.sp
This value represents the amount of time that the listed database
spent in a locked state \fIcombined\fP with the time that the
\fBmongod\fP spent in the global lock. Because of this, and
the sampling method, you may see some values greater than 100%.
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.B idx miss
The percent of index access attempts that required a page fault
to load a btree node. This is a sampled value.
.UNINDENT
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.B qr
The length of the queue of clients waiting to read data from the
MongoDB instance.
.UNINDENT
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.B qw
The length of the queue of clients waiting to write data from the
MongoDB instance.
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.B ar
The number of active clients performing read operations.
.UNINDENT
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.B aw
The number of active clients performing write operations.
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.B netIn
The amount of network traffic, in \fIbytes\fP, received by the MongoDB instance.
.sp
This includes traffic from \fBmongostat\fP itself.
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.B netOut
The amount of network traffic, in \fIbytes\fP, sent by the MongoDB instance.
.sp
This includes traffic from \fBmongostat\fP itself.
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.B conn
The total number of open connections.
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.B set
The name, if applicable, of the replica set.
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.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{
\fImaster\fP
T}
_
T{
SEC
T}	T{
\fIsecondary\fP
T}
_
T{
REC
T}	T{
recovering
T}
_
T{
UNK
T}	T{
unknown
T}
_
T{
SLV
T}	T{
\fIslave\fP
T}
_
.TE
.UNINDENT
.SH USAGE
.sp
In the first example, \fBmongostat\fP will return data every
second for 20 seconds. \fBmongostat\fP collects data from the
\fBmongod\fP instance running on the localhost interface on
port 27017. All of the following invocations produce identical
behavior:
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.sp
.nf
.ft C
mongostat \-\-rowcount 20 1
mongostat \-\-rowcount 20
mongostat \-n 20 1
mongostat \-n 20
.ft P
.fi
.UNINDENT
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.sp
In the next example, \fBmongostat\fP returns data every 5 minutes
(or 300 seconds) for as long as the program runs. \fBmongostat\fP
collects data from the \fBmongod\fP instance running on the
localhost interface on port \fB27017\fP\&. Both of the following
invocations produce identical behavior.
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.sp
.nf
.ft C
mongostat \-\-rowcount 0 300
mongostat \-n 0 300
mongostat 300
.ft P
.fi
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.sp
In the following example, \fBmongostat\fP returns data every 5
minutes for an hour (12 times.) \fBmongostat\fP collects data
from the \fBmongod\fP instance running on the localhost interface
on port 27017. Both of the following invocations produce identical
behavior.
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.sp
.nf
.ft C
mongostat \-\-rowcount 12 300
mongostat \-n 12 300
.ft P
.fi
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.sp
In many cases, using the \fI\-\-discover\fP
will help provide a more complete snapshot of the state of an entire
group of machines. If a \fBmongos\fP process connected to a
\fIsharded cluster\fP 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:
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.sp
.nf
.ft C
mongostat \-\-discover
.ft P
.fi
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.SH AUTHOR
MongoDB Documentation Project
.SH COPYRIGHT
2011-2013, MongoDB, Inc.
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