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POmongodb $maxScan didn't equals limit
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This is my first question on stack overflow, I am so happy and await your answers. My question is: When I use MongoDB Query Selectors, I want limit results. But <code>$maxScan</code> is not work as I want. ---------This is What I want result. <pre><code>db.post.find({query:{status:"publish"},$orderby:{date:-1}},{status:1,name:1,date:1,$slice:2}).limit(3) { "_id" : ObjectId("519262580cf21fb1647fb765"), "date" : ISODate("2013-05-14T16:12:08.600Z"), "status" : "publish", "name" : "关于多说" } { "_id" : ObjectId("519254ad0cf2f064f6ecef82"), "date" : ISODate("2013-05-14T15:13:49.017Z"), "status" : "publish", "name" : "回顾<蜗居>的100句经典台词" } { "_id" : ObjectId("519254690cf2f064f6ecef81"), "date" : ISODate("2013-05-14T15:12:41.462Z"), "status" : "publish", "name" : "女人脱光了是什么" } </code></pre> -----------This is the results I use $maxScan <pre><code>db.post.find({query:{status:"publish"},$maxScan:3,$orderby:{date:-1}},{status:1,name:1,date:1}) { "_id" : ObjectId("518e6c690cf21a363df2956e"), "date" : ISODate("2013-05-11T16:06:01.341Z"), "status" : "publish", "name" : "淘宝新店,充值任务" } </code></pre> I find may be the $maxScan didn't like limit(). it first limit the collection data and then execute the query! but this is not I want. Is anything i wrong? please help.Thanks --------------All results <pre><code>db.post.find({query:{},$orderby:{date:-1}},{status:1,name:1,date:1}) { "_id" : ObjectId("519262580cf21fb1647fb765"), "date" : ISODate("2013-05-14T16:12:08.600Z"), "status" : "publish", "name" : "关于多说" } { "_id" : ObjectId("519254ad0cf2f064f6ecef82"), "date" : ISODate("2013-05-14T15:13:49.017Z"), "status" : "publish", "name" : "回顾<蜗居>的100句经典台词" } { "_id" : ObjectId("519254690cf2f064f6ecef81"), "date" : ISODate("2013-05-14T15:12:41.462Z"), "status" : "publish", "name" : "女人脱光了是什么" } { "_id" : ObjectId("518ee61a0cf22bd326d60215"), "date" : ISODate("2013-05-12T00:45:14.295Z"), "status" : "publish", "name" : "JSTL日期格式化用法(转载)" } { "_id" : ObjectId("518e6c690cf21a363df2956e"), "date" : ISODate("2013-05-11T16:06:01.341Z"), "status" : "publish", "name" : "淘宝新店,充值任务" } { "_id" : ObjectId("518e21c90cf21a363df2956d"), "date" : ISODate("2013-05-11T10:47:37.803Z"), "status" : "draft", "name" : "一夜没睡" } { "_id" : ObjectId("518df75d0cf21a363df2956c"), "date" : ISODate("2013-05-11T07:46:37.726Z"), "status" : "draft", "name" : "飞娥入侵" } { "_id" : ObjectId("518d80630cf21a363df2956b"), "date" : ISODate("2013-05-10T23:18:59.323Z"), "status" : "publish", "name" : "Java的日期格式化常用方法" } </code></pre>
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mongodb $maxScan didn't equals limit
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