db.collection.reIndex()¶

db.collection.reIndex()¶

mongo Shell Method

This page documents the mongo shell method, and does not refer to the MongoDB Node.js driver (or any other driver) method. 本页记录了mongo shell方法，未提及MongoDB Node.js驱动程序（或任何其他驱动程序）方法。For corresponding MongoDB driver API, refer to your specific MongoDB driver documentation instead.有关相应的MongoDB驱动程序API，请参阅特定的MongoDB驱动程序文档。

The db.collection.reIndex() drops all indexes on a collection and recreates them. db.collection.reIndex()删除集合上的所有索引并重新创建它们。This operation may be expensive for collections that have a large amount of data and/or a large number of indexes.对于具有大量数据和/或大量索引的集合，此操作可能代价高昂。

Warning

• For most users, the db.collection.reIndex() operation is unnecessary.对于大多数用户来说，db.collection.reIndex()操作是不必要的。
• Avoid running db.collection.reIndex() against a collection in a replica set.避免对副本集中的集合运行db.collection.reIndex()。
• Do not run db.collection.reIndex() against a collection in a sharded cluster.不要对分片集群中的集合运行db.collection.reIndex()。

  Changed in version 4.2.在版本4.2中更改。MongoDB disallows db.collection.reIndex() to be run on a mongos, implementing a stronger restriction against running db.collection.reIndex() for a collection in a sharded cluster.MongoDB不允许在mongos上运行db.collection.reIndex()，从而对在分片集群中的集合运行db.collection.reIndex()实施了更严格的限制。