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NAME

       mongoc_read_concern_t - mongoc_read_concern_t

       Read Concern abstraction

SYNOPSIS

       New in MongoDB 3.2.

       The  mongoc_read_concern_t  allows clients to choose a level of isolation for their reads.
       The  default,  MONGOC_READ_CONCERN_LEVEL_LOCAL,  is  right  for  the  great  majority   of
       applications.

       You  can  specify  a  read  concern on connection objects, database objects, or collection
       objects.

       See readConcern on the MongoDB website for more information.

       Read  Concern  is  only  sent  to  MongoDB  when   it   has   explicitly   been   set   by
       mongoc_read_concern_set_level to anything other than NULL.

READ CONCERN LEVELS

       ┌───────────────────────────────────────┬──────────────────────────┬───────────────────────┐
       │Macro                                  │ Description              │ First MongoDB version │
       ├───────────────────────────────────────┼──────────────────────────┼───────────────────────┤
       │MONGOC_READ_CONCERN_LEVEL_LOCAL        │ Level    "local",    the │ 3.2                   │
       │                                       │ default.                 │                       │
       ├───────────────────────────────────────┼──────────────────────────┼───────────────────────┤
       │MONGOC_READ_CONCERN_LEVEL_MAJORITY     │ Level "majority".        │ 3.2                   │
       ├───────────────────────────────────────┼──────────────────────────┼───────────────────────┤
       │MONGOC_READ_CONCERN_LEVEL_LINEARIZABLE │ Level "linearizable".    │ 3.4                   │
       ├───────────────────────────────────────┼──────────────────────────┼───────────────────────┤
       │MONGOC_READ_CONCERN_LEVEL_AVAILABLE    │ Level "available".       │ 3.6                   │
       ├───────────────────────────────────────┼──────────────────────────┼───────────────────────┤
       │MONGOC_READ_CONCERN_LEVEL_SNAPSHOT     │ Level "snapshot".        │ 4.0                   │
       └───────────────────────────────────────┴──────────────────────────┴───────────────────────┘

       For     the    sake    of    compatibility    with    future    versions    of    MongoDB,
       mongoc_read_concern_set_level allows any string, not just this list of known read  concern
       levels.

       See  Read  Concern  Levels in the MongoDB manual for more information about the individual
       read concern levels.

AUTHOR

       MongoDB, Inc

COPYRIGHT

       2017-present, MongoDB, Inc