MongoDB 哪些地方会产生锁?

本文详细介绍了MongoDB中各种数据库操作所使用的锁类型。其中包括读锁和写锁的应用场景,如查询、获取更多数据、插入、删除及更新数据等操作。此外还探讨了特殊操作如Map-Reduce、创建索引及使用db.eval()和eval()命令时的锁行为。

Which operations lock the database?

原文:http://docs.mongodb.org/manual/faq/concurrency/#what-type-of-locking-does-mongodb-use

 

The following table lists common database operations and the types of locks they use.

 

OperationLock Type
Issue a queryRead lock
Get more data from a cursor Read lock
Insert dataWrite lock
Remove dataWrite lock
Update dataWrite lock
Map-reduceRead lock and write lock, unless operations are specified as non-atomic. Portions of map-reduce jobs can run concurrently.
Create an indexBuilding an index in the foreground, which is the default, locks the database for extended periods of time.
db.eval()Write lock. db.eval() blocks all other JavaScript processes.
evalWrite lock. If used with the nolock lock option, the eval option does not take a write lock and cannot write data to the database.
aggregate()Read lock
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