$listLocalSessions

Definition

$listLocalSessions

New in version 3.6.

Lists the sessions cached in memory by the mongod or mongos instance.

Important

When a user creates a session on a mongod or mongos instance, the record of the session initially exists only in-memory on the instance; i.e. the record is local to the instance. Periodically, the instance will sync its cached sessions to the system.sessions collection in the config database, at which time, they are visible to $listSessions and all members of the deployment. Until the session record exists in the system.sessions collection, you can only list the session via the $listLocalSessions operation.

The $listLocalSessions operation uses the db.aggregate() method and not the db.collection.aggregate().

To run $listLocalSessions, it must be the first stage in the pipeline.

The stage has the following syntax:

{ $listLocalSessions: <document> }

The $listLocalSessions stage takes a document with one of the following contents:

Field	Description
{ }	If running with access control, returns all sessions for the current authenticated user. If running without access control, returns all sessions.
{ users: [ { user: <user>, db: <db> }, ... ] }	Returns all sessions for the specified users. If running with access control, the authenticated user must have privileges with listSessions action on the cluster to list sessions for other users.
{ allUsers: true }	Returns all sessions for all users. If running with access control, the authenticated user must have privileges with listSessions action on the cluster.

Restrictions

$listLocalSessions is not allowed in transactions.

Examples

db.aggregate( [  { $listLocalSessions: { allUsers: true } } ] )

db.aggregate( [ { $listLocalSessions: { users: [ { user: "myAppReader", db: "test" } ] } } ] )

db.aggregate( [ { $listLocalSessions: { } } ] )