db.dropDatabase() (mongosh method方法)

Locks锁

The operation takes an exclusive (X) database lock only.该操作仅采用独占（X）数据库锁。

User Management用户管理

This command does not delete the users associated with the current database. 此命令不会删除与当前数据库关联的用户。To drop the associated users, run the dropAllUsersFromDatabase command in the database you are deleting.要删除关联的用户，请在要删除的数据库中运行dropAllUsersFromDatabase命令。

Indexes索引

The db.dropDatabase() method and dropDatabase command abort any in-progress index builds on collections in the target database before dropping the database. Aborting an index build has the same effect as dropping the built index.db.dropDatabase()方法和dropDatabase命令在删除数据库之前，会中止目标数据库中基于集合的任何正在进行的索引构建。中止索引构建与删除构建的索引具有相同的效果。

For replica sets or shard replica sets, aborting an index on the primary does not simultaneously abort secondary index builds. 对于副本集或分片副本集，中止主索引不会同时中止辅助索引构建。MongoDB attempts to abort the in-progress builds for the specified indexes on the primary and if successful creates an associated abort oplog entry. Secondary members with replicated in-progress builds wait for a commit or abort oplog entry from the primary before either committing or aborting the index build.MongoDB尝试中止primary上指定索引的正在进行的构建，如果成功，则创建相关的abortoplog条目。在提交或中止索引构建之前，具有正在进行的复制构建的 Secondary成员会等待主成员的提交或中止oplog条目。

Replica Set and Sharded Clusters复制品集和分片集群

Replica Sets复制集

At minimum, db.dropDatabase() waits until all collection drops in the database have propagated to a majority of the replica set members (i.e. uses the write concern "majority").db.dropDatabase()至少会等待，直到数据库中的所有集合删除都传播到大多数副本集成员（即使用写关注"majority"）。

You can specify a write concern to the method. If you specify a write concern that requires acknowledgment from fewer than the majority, the method uses write concern "majority".您可以为该方法指定写入关注。如果您指定了一个需要少于多数人确认的写关注，则该方法使用写关注"majority"。

If you specify a write concern that requires acknowledgment from more than the majority, the method uses the specified write concern.如果您指定了一个需要超过大多数人确认的写入关注，则该方法将使用指定的写入关注。

Sharded Clusters分片集群

When issued on a sharded cluster, MongoDB converts the specified write concern to "majority".当在分片集群上发布时，MongoDB会将指定的写入关注转换为"majority"。

If you intend to create a new database with the same name as the dropped database, you must run the dropDatabase command on a mongos.如果您打算创建一个与删除的数据库同名的新数据库，则必须在mongos上运行dropDatabase命令。

This ensures that all cluster nodes refresh their metadata cache, which includes the location of the primary shard for the new database. Otherwise, you may miss data on reads, and may not write data to the correct shard. To recover, you must manually intervene.这确保了所有集群节点刷新其元数据缓存，其中包括新数据库的主分片的位置。否则，您可能会在读取时丢失数据，并且可能无法将数据写入正确的分片。要恢复，您必须手动干预。

Starting in MongoDB 5.0, the dropDatabase command and the db.dropDatabase() method return an error if you try to drop the admin database or the config database from a mongos.从MongoDB 5.0开始，如果您尝试从mongos中删除admin数据库或config数据库，dropDatabase命令和db.dropDatabase()方法将返回错误。

Warning

Dropping the admin database or the config database can leave your cluster in an unusable state.删除admin数据库或config数据库可能会使集群处于不可用状态。

Change Streams更改流

The db.dropDatabase() method and dropDatabase command create an invalidate Event for any Change Streams opened on the dropped database or opened on the collections in the dropped database.db.dropDatabase()方法和dropDatabase命令为在已删除的数据库上打开的或在已删除数据库中的集合上打开的任何更改流创建无效事件。