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Database Methods

db.setLogLevel()

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  • Definition
  • Behavior
  • Examples

Definition

db.setLogLevel()

Sets a single verbosity level for log messages.

db.setLogLevel() has the following form:

db.setLogLevel(<level>, <component>)

db.setLogLevel() takes the following parameters:

Parameter
Type
Description
level
int

The log verbosity level.

The verbosity level can range from 0 to 5:

  • 0 is the MongoDB's default log verbosity level, to include Informational messages.

  • 1 to 5 increases the verbosity level to include Debug messages.

To inherit the verbosity level of the component's parent, you can also specify -1.

component
string

Optional. The name of the component for which to specify the log verbosity level. The component name corresponds to the <name> from the corresponding systemLog.component.<name>.verbosity setting:

Omit to specify the default verbosity level for all components.

Behavior

db.setLogLevel() sets a single verbosity level. To set multiple verbosity levels in a single operation, use either the setParameter command to set the logComponentVerbosity parameter. You can also specify the verbosity settings in the configuration file. See Configure Log Verbosity Levels for examples.

Note

Starting in version 4.2, MongoDB includes the Debug verbosity level (1-5) in the log messages. For example, if the verbosity level is 2, MongoDB logs D2. In previous versions, MongoDB log messages only specified D for Debug level.

Examples

Set Default Verbosity Level

Omit the <component> parameter to set the default verbosity for all components; i.e. the systemLog.verbosity setting. The operation sets the default verbosity to 1:

db.setLogLevel(1)

Set Verbosity Level for a Component

Specify the <component> parameter to set the verbosity for the component. The following operation updates the systemLog.component.storage.journal.verbosity to 2:

db.setLogLevel(2, "storage.journal" )

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db.serverStatus()