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Log Messages

Log Messages¶

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Timestamp
Severity Levels
Components
Configure Log Verbosity Level

mongosqld log messages have the form:

<timestamp> <severity> <component> [<context>] <message>

For example:

2017-08-17T13:34:48.910-0700 I NETWORK [initandlisten] waiting for connections at 127.0.0.1:3307

Timestamp¶

Log messages use iso8601 format for the timestamp, with a UTC offset set by the server on which mongosqld is running.

Severity Levels¶

The following table lists the severity levels associated with each log message:

Level	Description
`F`	Fatal
`E`	Error
`W`	Warning
`I`	Informational, for Verbosity Level of `0`
`D`	Debug, for All Verbosity Levels > `0`

The default log verbosity level is 0, which includes all non-Debug messages. Increasing the verbosity level adds additional Debug messages to the logs. To set the verbosity level, see Configure Log Verbosity Levels.

Components¶

Log messages include a component field, providing functional categorization of the messages:

Level	Description
`CONTROL`¶	Messages related to control activities, such as initialization.
`NETWORK`¶	Messages related to network activities, such as accepting connections.
`ALGEBRIZER`¶	Messages related to query plan generation.
`OPTIMIZER`¶	Messages related to query plan optimization.
`EXECUTOR`¶	Messages related to query execution.

Configure Log Verbosity Level¶

To configure the log verbosity level:

Include the -v option when starting mongosqld from the command line, or
Specify systemLog.verbosity in a mongosqld configuration file.

To specify a verbosity level when starting mongosqld, use the -v option. Repeating v increases the verbosity level.

Example

The following invocation of mongosqld sets the log verbosity level to Developer.

copy

mongosqld --schema schema.drdl --auth -vv

To learn more about the verbosity levels and how to use them, see --verbose.

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