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mongo.setSlaveOk()

Mongo.setSlaveOk()

For the current session, this command permits read operations from non-master (i.e. slave or secondary) instances. Practically, use this method in the following form:

db.getMongo().setSlaveOk()

Indicates that “eventually consistent” read operations are acceptable for the current application. This function provides the same functionality as rs.slaveOk().

See the readPref() method for more fine-grained control over read preference in the mongo shell.