getClusterParameter
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Definition
getClusterParametergetClusterParameteris an administrative command for retrieving the values of cluster parameters. Cluster parameters are configurable parameters which affect all nodes in a sharded cluster.To run
getClusterParameter, use thedb.adminCommand( { command } )method.
Syntax
The command has the following syntax:
db.adminCommand( { getClusterParameter: <parameter> | [<parameter>, <parameter>] | "'*'" } )
Command Fields
The command takes the following fields:
Field | Type | Description |
|---|---|---|
<parameter> | String or array of strings | You can specify one of the following:
|
Behavior
You can only run
getClusterParameteron theadmindatabase. If you run the command on any other database, MongoDB returns an error.You can run
getClusterParameteron any node in a replica set or sharded cluster.When you run
getClusterParameteronmongod,getClusterParameterreturns cached parameter values.When you run
getClusterParameteronmongos,getClusterParameterreturns the durable value of the cluster parameter from the config server
Accesss Control
When authentication is enabled, getClusterParameter
only works when authenticated as a user with a role that has access to the
getClusterParameter action.
Examples
Note
The output of the following examples may vary depending on the specific configuration of the running MongoDB deployment.
Retrieve Single Cluster Parameter
The following operation runs getClusterParameter on the admin
database using a value of hostName to retrieve the value for
a hypothetical cluster parameter named hostName:
use admin db.adminCommand( { getClusterParameter : "hostName" } )
Retrieve Multiple Cluster Parameters
The following operation runs getClusterParameter on the admin
database using the values hostName and testParameter to retrieve the
values for hypothetical cluster parameters named hostName and
testParameter:
use admin db.adminCommand( { getClusterParameter: [ "hostName", "testParameter" ] } )
Retrieve All Cluster Parameters
The following operation runs getClusterParameter with a value of
'*' to retrieve the values from all cluster parameters:
use admin db.adminCommand( { getClusterParameter : '*' } )