使用$查找查询并且运算符不能在MongoDB中使用索引

Question

我的文档结构如下，每个数组元素包含＆＃34; n＆＃34;和＆＃34; v＆＃34;作为不同类型数据的关键和价值。 （集合名称是doc）

min-height

和索引如下所示。

    { 
        "_id" : 1, 
        "logs" : [
            { "n" : "facility", "v" : 26 },
            { "n" : "num", "v" : 6 },
            { "n" : "ip", "v" : "137.68.151.104" },
            { "n" : "protocol", "v" : "55902/udp" },
            { "n" : "port", "v" : "53" } 
        ]
    },
    { 
        "_id" : 2, 
        "logs" : [ 
            { "n" : "facility", "v" : 26 }, 
            { "n" : "num", "v" : 6 },
            { "n" : "ip", "v" : "137.68.160.51" }, 
            { "n" : "protocol", "v" : "13438/tcp" }, 
            { "n" : "port", "v" : "13438" } 
        ]
    },
    { 
        "_id" : 3,
        "logs" : [
            { "n" : "facility", "v" : 26 },
            { "n" : "num", "v" : 6 }, 
            { "n" : "ip", "v" : "137.68.160.51" }, 
            { "n" : "protocol", "v" : "13434/tcp" },
            { "n" : "port", "v" : "53" } 
        ]
    },
    { 
        "_id" : 4,
        "logs" : [
            { "n" : "facility", "v" : 26 },
            { "n" : "num", "v" : 6 }, 
            { "n" : "ip", "v" : "137.68.160.184" },
            { "n" : "protocol", "v" : "61662/udp" },
            { "n" : "port", "v" : "53" } 
        ]
    },
    { 
        "_id" : 5, 
        "logs" : [ 
            { "n" : "facility", "v" : 26 },
            { "n" : "num", "v" : 6 }, 
            { "n" : "ip", "v" : "137.68.160.51" }, 
            { "n" : "protocol", "v" : "13435/tcp" }, 
            { "n" : "port", "v" : "13435" } 
        ]
    },
    { 
        "_id" : 6,
        "logs" : [ 
            { "n" : "facility", "v" : 26 },
            { "n" : "num", "v" : 6 },
            { "n" : "ip", "v" : "137.68.160.51" },
            { "n" : "protocol", "v" : "61662/udp" },
            { "n" : "port", "v" : "53" }
        ]
   }
   ...

我想查询这个条件。 ＆＃34; IP＆＃34;是＆＃34; 137.68.160.51＆＃34;和＆＃34; port＆＃34;是＆＃34; 53＆＃34;

所以，我这样查询。

>db.doc.getIndexes()
[
{
  "v" : 1,
    "key" : {
      "_id" : 1
    },
    "name" : "_id_",
    "ns" : "db_test.doc"
},
{
  "v" : 1,
  "key" : {
    "logs.n" : 1,
    "logs.v" : 1
  },
  "name" : "logs.n_1_logs.v_1",
  "ns" : "db_test.doc"
}
]

但是，查询非常慢。 （超过30秒） （＆＃34; ip＆＃34; ==＆＃34; 137.68.160.51＆＃34;文件计数为10,000,000。结果文件计数无效。）

我认为，MongoDB在使用$和operator的第二次查询时无法使用索引。

如果使用$和运算符进行查询，B查询和C查询， $和：[{A}，{B}，{C}]。 B和C查询不能使用索引。正确？