Creating An Index
MongoDB supports indexes, and they are very easy to add on a collection. To create an index, you specify the field name and direction: ascending (1) or descending (-1). The following creates an ascending index on the "i" field:
<?php
$connection = new MongoClient();
$collection = $connection->database->collectionName;
$coll->ensureIndex( array( "i" => 1 ) ); // create index on "i"
$coll->ensureIndex( array( "i" => -1, "j" => 1 ) ); // index on "i" descending, "j" ascending
?>
Indexing is critical for good read performance as your data grows. If you are not familiar with indexing, check out the MongoCollection::ensureIndex() documentation and the core » MongoDB indexing documentation.
- PHP Руководство
- Функции по категориям
- Индекс функций
- Справочник функций
- Расширения для работы с базами данных
- Расширения для работы с базами данных отдельных производителей
- MongoDB
- Manual
- Making a Connection
- Getting a Database
- Getting A Collection
- Inserting a Document
- Finding Documents using MongoCollection::findOne
- Adding Multiple Documents
- Counting Documents in A Collection
- Using a Cursor to Get All of the Documents
- Setting Criteria for a Query
- Getting A Set of Documents With a Query
- Creating An Index
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