db.collection.reIndex()

Definition定义

db.collection.reIndex()

Important重要

mongosh Method

This is a mongosh method. This is not the documentation for Node.js or other programming language specific driver methods.

In most cases, mongosh methods work the same way as the legacy mongo shell methods. However, some legacy methods are unavailable in mongosh.

For the legacy mongo shell documentation, refer to the documentation for the corresponding MongoDB Server release:

• mongo shell v4.4
• mongo shell v4.2
• mongo shell v4.0

For MongoDB API drivers, refer to the language specific MongoDB driver documentation.

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警告

• db.collection.reIndex() may only be run on standalone instances.只能在单机版实例上运行。
• For most users, the db.collection.reIndex() command is unnecessary.对于大多数用户，db.collection.reIndex()命令是不必要的。

Behavior行为

For MongoDB 5.0 or later, db.collection.reIndex() may only be run on standalone instances.对于MongoDB 5.0或更高版本，db.collection.reIndex()只能在单机版实例上运行。

For MongoDB 2.6 through MongoDB versions with featureCompatibilityVersion (fCV) set to "4.0" or earlier, MongoDB will not create an index on a collection if the index entry for an existing document exceeds the Maximum Index Key Length.对于featureCompatibilityVersion(fCV)设置为“4.0”或更早版本的MongoDB 2.6到MongoDB版本，如果现有文档的索引条目超过最大索引密钥长度，MongoDB将不会在集合上创建索引。