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索引


  1. MONGODB的BASIC INDEXES 和 COMPOUND INDEXES 研究

    前几天看到一个关于 MongoDB 深入索引的PPT

    MongoDB Indexing: The Details

    仔细的从头看到尾, 里面有个关于Compound Indexes的Range and Equality的讲解,在ppt第129页,重新回顾下这个例子.向一个collection中插入 9 条数据,像下面这样:

    
    > db.good.find()
    { "_id" : ObjectId("4e8d629d8ad8bdf2ed6c1990"), "x" : 1, "y" : "b" }
    { "_id" : ObjectId("4e8d62a38ad8bdf2ed6c1991"), "x" : 3, "y" : "d" }
    { "_id" : ObjectId("4e8d62ad8ad8bdf2ed6c1992"), "x" : 4, "y" : "g" }
    { "_id" : ObjectId("4e8d62b28ad8bdf2ed6c1993"), "x" : 5, "y" : "c" }
    { "_id" : ObjectId("4e8d62ba8ad8bdf2ed6c1994"), "x" : 6, "y" : "a" }
    { "_id" : ObjectId("4e8d62c18ad8bdf2ed6c1995"), "x" : 7, "y" : "e" }
    { "_id" : ObjectId("4e8d62ce8ad8bdf2ed6c1996"), "x" : 8, "y" : "c" }
    { "_id" : ObjectId("4e8d62d38ad8bdf2ed6c1997"), "x" : 9, "y" : "f" }
    { "_id" : ObjectId("4e8d719a6cee6416a5a75a43"), "x" : 5, "y" : "d" }
    
    

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