MONGOC_WRITE_CONCERN_T - Online Linux Manual PageSection : 3
Updated : Feb 04, 2021
Source : 1.17.4
Note : libmongoc
NAMEmongoc_write_concern_t − mongoc_write_concern_t Write Concern abstraction
SYNOPSISmongoc_write_concern_t tells the driver what level of acknowledgement to await from the server. The default, MONGOC_WRITE_CONCERN_W_DEFAULT, is right for the great majority of applications. You can specify a write concern on connection objects, database objects, collection objects, or per−operation. Data−modifying operations typically use the write concern of the object they operate on, and check the server response for a write concern error or write concern timeout. For example, mongoc_collection_drop_index uses the collection's write concern, and a write concern error or timeout in the response is considered a failure. Exceptions to this principle are the generic command functions: • mongoc_client_command • mongoc_client_command_simple • mongoc_database_command • mongoc_database_command_simple • mongoc_collection_command • mongoc_collection_command_simple These generic command functions do not automatically apply a write concern, and they do not check the server response for a write concern error or write concern timeout. See ­Write Concern on the MongoDB website for more information.
WRITE CONCERN LEVELSSet the write concern level with mongoc_write_concern_set_w​. MONGOC_WRITE_CONCERN_W_DEFAULT (1) By default, writes block awaiting acknowledgement from MongoDB. Acknowledged write concern allows clients to catch network, duplicate key, and other errors. MONGOC_WRITE_CONCERN_W_UNACKNOWLEDGED (0) With this write concern, MongoDB does not acknowledge the receipt of write operation. Unacknowledged is similar to errors ignored; however, mongoc attempts to receive and handle network errors when possible. MONGOC_WRITE_CONCERN_W_MAJORITY (majority) Block until a write has been propagated to a majority of the nodes in the replica set. n Block until a write has been propagated to at least n nodes in the replica set.
DEPRECATIONSThe write concern MONGOC_WRITE_CONCERN_W_ERRORS_IGNORED (value −1) is a deprecated synonym for MONGOC_WRITE_CONCERN_W_UNACKNOWLEDGED (value 0), and will be removed in the next major release. mongoc_write_concern_set_fsync is deprecated.
AUTHORMongoDB, Inc
COPYRIGHT2017-present, MongoDB, Inc 0
Johanes Gumabo
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