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.\" ========================================================================
.\"
.IX Title "MongoDB::ReadConcern 3pm"
.TH MongoDB::ReadConcern 3pm "2020-08-15" "perl v5.30.3" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.SH "NAME"
MongoDB::ReadConcern \- Encapsulate and validate a read concern
.SH "VERSION"
.IX Header "VERSION"
version v2.2.2
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&    $rc = MongoDB::ReadConcern\->new(); # no defaults
\&
\&    $rc = MongoDB::ReadConcern\->new(
\&        level    => \*(Aqlocal\*(Aq,
\&    );
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
A Read Concern describes the constraints that MongoDB must satisfy when reading
data.  Read Concern was introduced in MongoDB 3.2.
.SH "ATTRIBUTES"
.IX Header "ATTRIBUTES"
.SS "level"
.IX Subsection "level"
The read concern level determines the consistency level required
of data being read.
.PP
The default level is \f(CW\*(C`undef\*(C'\fR, which means the server will use its configured
default.
.PP
If the level is set to \*(L"local\*(R", reads will return the latest data a server has
locally.
.PP
Additional levels are storage engine specific.  See Read
Concern <http://docs.mongodb.org/manual/search/?query=readConcern> in the MongoDB
documentation for more details.
.PP
This may be set in a connection string with the the \f(CW\*(C`readConcernLevel\*(C'\fR option.
.SH "AUTHORS"
.IX Header "AUTHORS"
.IP "\(bu" 4
David Golden <david@mongodb.com>
.IP "\(bu" 4
Rassi <rassi@mongodb.com>
.IP "\(bu" 4
Mike Friedman <friedo@friedo.com>
.IP "\(bu" 4
Kristina Chodorow <k.chodorow@gmail.com>
.IP "\(bu" 4
Florian Ragwitz <rafl@debian.org>
.SH "COPYRIGHT AND LICENSE"
.IX Header "COPYRIGHT AND LICENSE"
This software is Copyright (c) 2020 by MongoDB, Inc.
.PP
This is free software, licensed under:
.PP
.Vb 1
\&  The Apache License, Version 2.0, January 2004
.Ve