mongodb - mongodump 是否锁定数据库？

Question

我正在为 mongo 设置备份策略，只是想知道 mongodump 在执行数据库转储之前是否会锁定数据库？

Answer 1

我在 mongo's google group 上找到了这个:

Mongodump does a simple query on the live system and does not require a shutdown. Like all queries it requires a read lock while running but doesn't not block any more than normal queries.

If you have a replica set you will probably want to use the --oplog flag to do your backups.

有关详细信息，请参阅文档

• http://docs.mongodb.org/manual/administration/backups/

另外我发现了这个以前问过的问题

• MongoDB: mongodump/restore vs. backup up files directly

摘自上述问题

Locking and copying files is only an option when you don't have heavy write load.

mongodump can be run against live server. It will create some additional load, so don't do it on peak hours. Also, it is advised to do it on a secondary node (if you don't use replica sets, you should).

There are some complications when you have a DB so large that no single machine can hold it. See this document.

Also, if you have replica set, you take down one of secondaries and copy its files directly. See http://www.mongodb.org/display/DOCS/Backups: