1MongoDB::IndexView(3) User Contributed Perl DocumentationMongoDB::IndexView(3)
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3
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NAME

6       MongoDB::IndexView - Index management for a collection
7

VERSION

9       version v2.2.2
10

SYNOPSIS

12           my $indexes = $collection->indexes;
13
14           # listing indexes
15
16           @names = map { $_->{name} } $indexes->list->all;
17
18           my $result = $indexes->list;
19
20           while ( my $index_doc = $result->next ) {
21               # do stuff with each $index_doc
22           }
23
24           # creating indexes
25
26           $name = $indexes->create_one( [ x => 1, y => -1 ], { unique => 1 } );
27
28           @names = $indexes->create_many(
29               { keys => [ x => 1, y => -1 ], options => { unique => 1 } },
30               { keys => [ z => 1 ] },
31           );
32
33           # dropping indexes
34
35           $indexes->drop_one( "x_1_y_-1" );
36
37           $indexes->drop_all;
38

DESCRIPTION

40       This class models the indexes on a MongoDB::Collection so you can
41       create, list or drop them.
42
43       For more on MongoDB indexes, see the MongoDB Manual pages on indexing
44       <http://docs.mongodb.org/manual/core/indexes/>
45

ATTRIBUTES

47   collection
48       The MongoDB::Collection for which indexes are being created or viewed.
49

METHODS

51   list
52           $result = $indexes->list;
53
54           while ( my $index = $result->next ) {
55               ...
56           }
57
58           for my $index ( $result->all ) {
59               ...
60           }
61
62       This method returns a MongoDB::QueryResult which can be used to
63       retrieve index information either one at a time (with "next") or all at
64       once (with "all").
65
66       If the list can't be retrieved, an exception will be thrown.
67
68   create_one
69           $name = $indexes->create_one( [ x => 1 ] );
70           $name = $indexes->create_one( [ x => 1, y => 1 ] );
71           $name = $indexes->create_one( [ z => 1 ], { unique => 1 } );
72
73       This method takes an ordered index specification document and an
74       optional hash reference of index options and returns the name of the
75       index created.  It will throw an exception on error.
76
77       The index specification document is an ordered document (array
78       reference, Tie::IxHash object, or single-key hash reference) with index
79       keys and direction/type.
80
81       See "create_many" for important information about index specifications
82       and options.
83
84       The following additional options are recognized:
85
86       •   "maxTimeMS" — maximum time in milliseconds before the operation
87           will time out.
88
89   create_many
90           @names = $indexes->create_many(
91               { keys => [ x => 1, y => 1 ] },
92               { keys => [ z => 1 ], options => { unique => 1 } }
93           );
94
95           @names = $indexes->create_many(
96               { keys => [ x => 1, y => 1 ] },
97               { keys => [ z => 1 ], options => { unique => 1 } }
98               \%global_options,
99           );
100
101       This method takes a list of index models (given as hash references) and
102       returns a list of index names created.  It will throw an exception on
103       error.
104
105       If the last value is a hash reference without a "keys" entry, it will
106       be assumed to be a set of global options. See below for a list of
107       accepted global options.
108
109       Each index module is described by the following fields:
110
111       •   "keys" (required) — an index specification as an ordered document
112           (array reference, Tie::IxHash object, or single-key hash reference)
113           with index keys and direction/type.  See below for more.
114
115       •   "options" — an optional hash reference of index options.
116
117       The "keys" document needs to be ordered.  You are STRONGLY encouraged
118       to get in the habit of specifying index keys with an array reference.
119       Because Perl randomizes the order of hash keys, you may ONLY use a hash
120       reference if it contains a single key.
121
122       The form of the "keys" document differs based on the type of index
123       (e.g.  single-key, multi-key, text, geospatial, etc.).
124
125       For single and multi-key indexes, the value is "1" for an ascending
126       index and "-1" for a descending index.
127
128           [ name => 1, votes => -1 ] # ascending on name, descending on votes
129
130       See Index Types <http://docs.mongodb.org/manual/core/index-types/> in
131       the MongoDB Manual for instructions for other index types.
132
133       The "options" hash reference may have a mix of general-purpose and
134       index-type-specific options.  See Index Options
135       <http://docs.mongodb.org/manual/reference/method/db.collection.createIndex/#options>
136       in the MongoDB Manual for specifics.
137
138       Some of the more commonly used options include:
139
140       •   "background" — when true, index creation won't block but will run
141           in the background; this is strongly recommended to avoid blocking
142           other operations on the database.
143
144       •   "collation" - a document defining the collation for this operation.
145           See docs for the format of the collation document here:
146           <https://docs.mongodb.com/master/reference/collation/>.
147
148       •   "unique" — enforce uniqueness when true; inserting a duplicate
149           document (or creating one with update modifiers) will raise an
150           error.
151
152       •   "name" — a name (string) for the index; one will be generated if
153           this is omitted.
154
155       Global options specified as the last value can contain the following
156       keys:
157
158       •   "maxTimeMS" — maximum time in milliseconds before the operation
159           will time out.
160
161   drop_one
162           $output = $indexes->drop_one( $name );
163           $output = $indexes->drop_one( $name, \%options );
164
165       This method takes the name of an index and drops it.  It returns the
166       output of the dropIndexes command (a hash reference) on success or
167       throws a exception if the command errors.  However, if the index does
168       not exist, the command output will have the "ok" field as a false
169       value, but no exception will e thrown.
170
171       Valid options are:
172
173       •   "maxTimeMS" — maximum time in milliseconds before the operation
174           will time out.
175
176   drop_all
177           $output = $indexes->drop_all;
178           $output = $indexes->drop_all(\%options);
179
180       This method drops all indexes (except the one on the "_id" field).  It
181       returns the output of the dropIndexes command (a hash reference) on
182       success or throws a exception if the command fails.
183
184       Valid options are:
185
186       •   "maxTimeMS" — maximum time in milliseconds before the operation
187           will time out.
188

AUTHORS

190       •   David Golden <david@mongodb.com>
191
192       •   Rassi <rassi@mongodb.com>
193
194       •   Mike Friedman <friedo@friedo.com>
195
196       •   Kristina Chodorow <k.chodorow@gmail.com>
197
198       •   Florian Ragwitz <rafl@debian.org>
199

201       This software is Copyright (c) 2020 by MongoDB, Inc.
202
203       This is free software, licensed under:
204
205         The Apache License, Version 2.0, January 2004
206
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209perl v5.34.0                      2021-07-22             MongoDB::IndexView(3)
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