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.TH "MONGOC_READ_CONCERN_T" "3" "May 07, 2024" "1.27.1" "libmongoc"
.sp
Read Concern abstraction
.SH SYNOPSIS
.sp
New in MongoDB 3.2.
.sp
The \fBmongoc_read_concern_t\fP 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.
.sp
You can specify a read concern on connection objects, database objects, or collection objects.
.sp
See \fI\%readConcern\fP on the MongoDB website for more information.
.sp
Read Concern is only sent to MongoDB when it has explicitly been set by \fI\%mongoc_read_concern_set_level()\fP to anything other than NULL.
.SH READ CONCERN LEVELS
.TS
center;
|l|l|l|.
_
T{
Macro
T}	T{
Description
T}	T{
First MongoDB version
T}
_
T{
MONGOC_READ_CONCERN_LEVEL_LOCAL
T}	T{
Level \(dqlocal\(dq, the default.
T}	T{
3.2
T}
_
T{
MONGOC_READ_CONCERN_LEVEL_MAJORITY
T}	T{
Level \(dqmajority\(dq.
T}	T{
3.2
T}
_
T{
MONGOC_READ_CONCERN_LEVEL_LINEARIZABLE
T}	T{
Level \(dqlinearizable\(dq.
T}	T{
3.4
T}
_
T{
MONGOC_READ_CONCERN_LEVEL_AVAILABLE
T}	T{
Level \(dqavailable\(dq.
T}	T{
3.6
T}
_
T{
MONGOC_READ_CONCERN_LEVEL_SNAPSHOT
T}	T{
Level \(dqsnapshot\(dq.
T}	T{
4.0
T}
_
.TE
.sp
For the sake of compatibility with future versions of MongoDB, \fI\%mongoc_read_concern_set_level()\fP allows any string, not just this list of known read concern levels.
.sp
See \fI\%Read Concern Levels\fP in the MongoDB manual for more information about the individual read concern levels.
.SH AUTHOR
MongoDB, Inc
.SH COPYRIGHT
2017-present, MongoDB, Inc
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