Question

我希望通过两个值来查询mongodb集合：

restaurantId（String）
creationTime（NumberLong纪元时间）

我希望为要查询的creationTime参数提供一系列值：

{"$and":[
    {"creationTime":{"$gt":"TIME_START"}},
    {"creationTime":{"$lt":"TIME_END"}},
    {"restaurantId":"ID_STRING"},
]}

此集合有两个索引：

{
    "restaurantId" : 1,
    "creationTime" : 1
}

{
    "creationTime" : 1
}

db.Meal.stats（）

{
    "ns" : "waiterio_database.Meal",
    "count" : 472855,
    "size" : 1022141200,
    "avgObjSize" : 2161.637711349145,
    "storageSize" : 1180352512,
    "numExtents" : 16,
    "nindexes" : 3,
    "lastExtentSize" : 316321792,
    "paddingFactor" : 1.1150000000386548,
    "systemFlags" : 1,
    "userFlags" : 0,
    "totalIndexSize" : 102567920,
    "indexSizes" : {
        "id" : 30586416,
        "restaurantId_1_creationTime_1" : 49939008,
        "creationTime_1" : 22042496
    },
    "ok" : 1
}

复合查询说明（）

{ 
   "cursor":"BtreeCursor restaurantId_1_creationTime_1",
   "isMultiKey":false,
   "n":100,
   "nscannedObjects":100,
   "nscanned":100,
   "nscannedObjectsAllPlans":100,
   "nscannedAllPlans":100,
   "scanAndOrder":false,
   "indexOnly":false,
   "nYields":0,
   "nChunkSkips":0,
   "millis":0,
   "indexBounds":{  
      "restaurantId":[  
         [  
            "51af5b90e4b03c3d231ee0c5",
            "51af5b90e4b03c3d231ee0c5"
         ]
      ],
      "creationTime":[  
         [  
            1435708800000,
            1.7976931348623157E308
         ]
      ]
   },
   "allPlans":[  
      {  
         "cursor":"BtreeCursor restaurantId_1_creationTime_1",
         "n":100,
         "nscannedObjects":100,
         "nscanned":100,
         "indexBounds":{  
            "restaurantId":[  
               [  
                  "51af5b90e4b03c3d231ee0c5",
                  "51af5b90e4b03c3d231ee0c5"
               ]
            ],
            "creationTime":[  
               [  
                  1435708800000,
                  1.7976931348623157E308
               ]
            ]
         }
      }
   ],
   "oldPlan":{  
      "cursor":"BtreeCursor restaurantId_1_creationTime_1",
      "indexBounds":{  
         "restaurantId":[  
            [  
               "51af5b90e4b03c3d231ee0c5",
               "51af5b90e4b03c3d231ee0c5"
            ]
         ],
         "creationTime":[  
            [  
               1435708800000,
               1.7976931348623157E308
            ]
         ]
      }
   },
   "server":"SERVER_HOST"
}

数据库托管在Mongolab上，它报告平均查询需要更长的时间，并且它建议索引（即使我已经设置了这两个）。 Mongolab仪表板建议：不支持的查询模式

知道如何设置可以使用这种查询的集合的索引吗？

（mongod版本：2.4.10）

关于范围编号的Mongodb复合查询很慢

0 个答案: