发布于 2015-09-14 15:12:33 | 67 次阅读 | 评论: 0 | 来源: 网络整理
Constrains the query to only scan the specified number of documents when fulfilling the query. Use one of the following forms:
db.collection.find( { <query> } )._addSpecial( "$maxScan" , <number> )
db.collection.find( { $query: { <query> }, $maxScan: <number> } )
Use this modifier to prevent potentially long running queries from disrupting performance by scanning through too much data.