MongoDB3.2.10 geo查詢過慢的問題
版本
Mongo3.2.10
問題
稠密集下geo查詢傳回最近的30條，需要掃描20000 的記錄。
同樣的點集，嘗試建立2d索引和2dsphere索引查詢，執行效率相差不大。
執行語句
語句1的執行環境
2d index
{
"v" : 1,
"key" : {
"lag" : "2d"
},
"name" : "lag",
"min" : -180,
"ns" : "mobike_default.mBKBikeInfo",
"bits" : 26,
"max" : 180
},db.coll.find({lag:{'$nearSphere':[120.993965,31.449034 ], '$maxDistance':7.83927971443699e-05*2}}).limit(30).explain(true)
MongoDB shell version: 3.2.8
connecting to: 10.108.93.135:7004/admin
{
"queryPlanner" : {
"plannerVersion" : 1,
"namespace" : "{db}.{coll}",
"indexFilterSet" : false,
"parsedQuery" : {
"lag" : {
"$nearSphere" : [
120.993965,
31.449034
],
"$maxDistance" : 0.0000783927971443699
}
},
"winningPlan" : {
"stage" : "LIMIT",
"limitAmount" : 30,
"inputStage" : {
"stage" : "GEO_NEAR_2D",
"keyPattern" : {
"lag" : "2d"
},
"indexName" : "lag",
"inputStages" : [
{
"stage" : "FETCH",
"inputStage" : {
"stage" : "IXSCAN",
"keyPattern" : {
"lag" : "2d"
},
"indexName" : "lag",
"isMultiKey" : false,
"isUnique" : false,
"isSparse" : false,
"isPartial" : false,
"indexVersion" : 1,
"direction" : "forward",
"indexBounds" : {
"lag" : [
"[BinData(128, E33C11D200000000), BinData(128, E33C11D2FFFFFFFF)]",
"[BinData(128, E33C11D300000000), BinData(128, E33C11D33FFFFFFF)]",
"[BinData(128, E33C11D360000000), BinData(128, E33C11D36FFFFFFF)]",
"[BinData(128, E33C11D370000000), BinData(128, E33C11D37FFFFFFF)]",
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"[BinData(128, E33C11D3C0000000), BinData(128, E33C11D3FFFFFFFF)]",
"[BinData(128, E33C11D688000000), BinData(128, E33C11D68BFFFFFF)]",
"[BinData(128, E33C11D6A0000000), BinData(128, E33C11D6AFFFFFFF)]",
"[BinData(128, E33C11D800000000), BinData(128, E33C11D8FFFFFFFF)]",
"[BinData(128, E33C11D900000000), BinData(128, E33C11D9FFFFFFFF)]",
"[BinData(128, E33C11DA10000000), BinData(128, E33C11DA1FFFFFFF)]",
"[BinData(128, E33C11DA40000000), BinData(128, E33C11DA7FFFFFFF)]",
"[BinData(128, E33C11DB00000000), BinData(128, E33C11DB3FFFFFFF)]",
"[BinData(128, E33C11DB40000000), BinData(128, E33C11DB7FFFFFFF)]",
"[BinData(128, E33C11DC00000000), BinData(128, E33C11DC3FFFFFFF)]",
"[BinData(128, E33C11DC80000000), BinData(128, E33C11DCBFFFFFFF)]"
]
}
}
},
{
"stage" : "FETCH",
"inputStage" : {
"stage" : "IXSCAN",
"keyPattern" : {
"lag" : "2d"
},
"indexName" : "lag",
"isMultiKey" : false,
"isUnique" : false,
"isSparse" : false,
"isPartial" : false,
"indexVersion" : 1,
"direction" : "forward",
"indexBounds" : {
"lag" : [ ]
}
}
},
{
"stage" : "FETCH",
"inputStage" : {
"stage" : "IXSCAN",
"keyPattern" : {
"lag" : "2d"
},
"indexName" : "lag",
"isMultiKey" : false,
"isUnique" : false,
"isSparse" : false,
"isPartial" : false,
"indexVersion" : 1,
"direction" : "forward",
"indexBounds" : {
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}
}
},
{
"stage" : "FETCH",
"inputStage" : {
"stage" : "IXSCAN",
"keyPattern" : {
"lag" : "2d"
},
"indexName" : "lag",
"isMultiKey" : false,
"isUnique" : false,
"isSparse" : false,
"isPartial" : false,
"indexVersion" : 1,
"direction" : "forward",
"indexBounds" : {
"lag" : [
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"[BinData(128, E33C11D350000000), BinData(128, E33C11D35FFFFFFF)]",
"[BinData(128, E33C11D680000000), BinData(128, E33C11D683FFFFFF)]",
"[BinData(128, E33C11D684000000), BinData(128, E33C11D687FFFFFF)]",
"[BinData(128, E33C11D68C000000), BinData(128, E33C11D68FFFFFFF)]"
]
}
}
},
{
"stage" : "FETCH",
"inputStage" : {
"stage" : "IXSCAN",
"keyPattern" : {
"lag" : "2d"
},
"indexName" : "lag",
"isMultiKey" : false,
"isUnique" : false,
"isSparse" : false,
"isPartial" : false,
"indexVersion" : 1,
"direction" : "forward",
"indexBounds" : {
"lag" : [ ]
}
}
},
{
"stage" : "FETCH",
"inputStage" : {
"stage" : "IXSCAN",
"keyPattern" : {
"lag" : "2d"
},
"indexName" : "lag",
"isMultiKey" : false,
"isUnique" : false,
"isSparse" : false,
"isPartial" : false,
"indexVersion" : 1,
"direction" : "forward",
"indexBounds" : {
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"[BinData(128, E33C11D6B0000000), BinData(128, E33C11D6BFFFFFFF)]",
"[BinData(128, E33C11DA00000000), BinData(128, E33C11DA0FFFFFFF)]",
"[BinData(128, E33C11DA20000000), BinData(128, E33C11DA2FFFFFFF)]",
"[BinData(128, E33C11DA30000000), BinData(128, E33C11DA3FFFFFFF)]"
]
}
}
},
{
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},
"indexName" : "lag",
"isMultiKey" : false,
"isUnique" : false,
"isSparse" : false,
"isPartial" : false,
"indexVersion" : 1,
"direction" : "forward",
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]
}
}
},
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},
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"[BinData(128, E33C11D620000000), BinData(128, E33C11D623FFFFFF)]",
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]
}
}
}
]
}
},
"rejectedPlans" : [ ]
},
"executionStats" : {
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"nReturned" : 30,
"executionTimeMillis" : 185,
"totalKeysExamined" : 24613,
"totalDocsExamined" : 24599,
"executionStages" : {
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},
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},
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},
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bye
語句2的執行環境
2dsphere index
{
"v" : 1,
"key" : {
"loc" : "2dsphere"
},
"name" : "loc_2dsphere",
"ns" : "mobike_default.kdytbl",
"2dsphereIndexVersion" : 3
}db.kdytbl.find({loc:{ $nearSphere: { $geometry: { type : "Point",coordinates : [120.993965,31.449034]},$maxDistance:1000}}}).limit(30).explain(true)MongoDB shell version: 3.2.8
connecting to: 10.108.93.135:7004/admin
{
"queryPlanner" : {
"plannerVersion" : 1,
"namespace" : "{db}.{coll}",
"indexFilterSet" : false,
"parsedQuery" : {
"loc" : {
"$nearSphere" : {
"$geometry" : {
"type" : "Point",
"coordinates" : [
120.993965,
31.449034
]
},
"$maxDistance" : 1000
}
}
},
"winningPlan" : {
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},
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"keyPattern" : {
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},
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}
},
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},
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},
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},
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