The read concern level determines the consistency level required
of data being read.
The default level is undef, which means the server will use its configured
If the level is set to local, reads will return the latest data a server has
Additional levels are storage engine specific. See Read
Concern <http://docs.mongodb.org/manual/search/?query=readConcern> in the MongoDB
documentation for more details.
This may be set in a connection string with the the readConcernLevel option.
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This is free software, licensed under:
The Apache License, Version 2.0, January 2004