1MONGOC_READ_CONCERN_T(3)           libmongoc          MONGOC_READ_CONCERN_T(3)
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NAME

6       mongoc_read_concern_t - mongoc_read_concern_t
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8       Read Concern abstraction
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SYNOPSIS

11       New in MongoDB 3.2.
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13       The mongoc_read_concern_t allows clients to choose a level of isolation
14       for their reads. The default, MONGOC_READ_CONCERN_LEVEL_LOCAL, is right
15       for the great majority of applications.
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17       You can specify a read concern on connection objects, database objects,
18       or collection objects.
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20       See readConcern on the MongoDB website for more information.
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22       Read Concern is only sent to MongoDB when it has explicitly been set by
23       mongoc_read_concern_set_level to anything other than NULL.
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READ CONCERN LEVELS

26          ┌────────────────────┬─────────────────────┬─────────────────────┐
27          │Macro               │ Description         │ First  MongoDB ver‐ │
28          │                    │                     │ sion                │
29          ├────────────────────┼─────────────────────┼─────────────────────┤
30          │MONGOC_READ_CON‐    │ Level  "local", the │ 3.2                 │
31          │CERN_LEVEL_LOCAL    │ default.            │                     │
32          ├────────────────────┼─────────────────────┼─────────────────────┤
33          │MONGOC_READ_CON‐    │ Level "majority".   │ 3.2                 │
34          │CERN_LEVEL_MAJORITY │                     │                     │
35          ├────────────────────┼─────────────────────┼─────────────────────┤
36          │MONGOC_READ_CON‐    │ Level    "lineariz‐ │ 3.4                 │
37          │CERN_LEVEL_LIN‐     │ able".              │                     │
38          │EARIZABLE           │                     │                     │
39          ├────────────────────┼─────────────────────┼─────────────────────┤
40          │MONGOC_READ_CON‐    │ Level "available".  │ 3.6                 │
41          │CERN_LEVEL_AVAIL‐   │                     │                     │
42          │ABLE                │                     │                     │
43          ├────────────────────┼─────────────────────┼─────────────────────┤
44          │MONGOC_READ_CON‐    │ Level "snapshot".   │ 4.0                 │
45          │CERN_LEVEL_SNAPSHOT │                     │                     │
46          └────────────────────┴─────────────────────┴─────────────────────┘
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48       For  the  sake  of  compatibility with future versions of MongoDB, mon‐
49       goc_read_concern_set_level allows any string, not  just  this  list  of
50       known read concern levels.
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52       See  Read  Concern  Levels  in  the MongoDB manual for more information
53       about the individual read concern levels.
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AUTHOR

56       MongoDB, Inc
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59       2017-present, MongoDB, Inc
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641.16.2                           Feb 25, 2020         MONGOC_READ_CONCERN_T(3)
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