如何解决用于查找两个数字之间的数字的MongoDB索引具有高键扫描
我有一个集合,用于按用户的基数10转换后的IP地址查找其ASN。架构如下:
{
rangeStart: { type: Number },rangeEnd: { type: Number },asn: { type: Number },countryCode: { type: String },description: { type: String }
}
,索引为:
{
"v" : 2,"key" : {
"rangeStart" : 1,"rangeEnd" : -1
},"name" : "rangeStart_1_rangeEnd_-1","ns" : "mydb.asns"
}
db中大约有450k条记录,许多查询扫描了100k +个键。下面的查询示例:
db.asns.find({ "$and": [ { "rangeStart": { "$lte": 2931838208 } },{ "rangeEnd": { "$gte": 2931838208 } } ] })
对于上述示例查询,执行状态如下:
{
"queryPlanner" : {
"plannerVersion" : 1,"namespace" : "mydb.asns","indexFilterSet" : false,"parsedQuery" : {
"$and" : [
{
"rangeStart" : {
"$lte" : 2931838208
}
},{
"rangeEnd" : {
"$gte" : 2931838208
}
}
]
},"winningPlan" : {
"stage" : "FETCH","inputStage" : {
"stage" : "IXSCAN","keyPattern" : {
"rangeStart" : 1,"rangeEnd" : -1
},"indexName" : "rangeStart_1_rangeEnd_-1","isMultiKey" : false,"multiKeyPaths" : {
"rangeStart" : [ ],"rangeEnd" : [ ]
},"isUnique" : false,"isSparse" : false,"isPartial" : false,"indexVersion" : 2,"direction" : "forward","indexBounds" : {
"rangeStart" : [
"[-inf.0,2931838208.0]"
],"rangeEnd" : [
"[inf.0,2931838208.0]"
]
}
}
},"rejectedPlans" : [ ]
},"executionStats" : {
"executionSuccess" : true,"nReturned" : 1,"executionTimeMillis" : 405,"totalKeysExamined" : 244238,"totalDocsExamined" : 1,"executionStages" : {
"stage" : "FETCH","executionTimeMillisEstimate" : 38,"works" : 244238,"advanced" : 1,"needTime" : 244236,"needYield" : 0,"saveState" : 1908,"restoreState" : 1908,"isEOF" : 1,"docsExamined" : 1,"alreadyHasObj" : 0,"executionTimeMillisEstimate" : 37,2931838208.0]"
]
},"keysExamined" : 244238,"seeks" : 244237,"dupsTested" : 0,"dupsDropped" : 0
}
}
},"ok" : 1,"operationTime" : Timestamp(1598628189,18)
}
任何有关如何使此查询更高效的想法都值得赞赏。谢谢!
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