我是mongo的新手，以下查询执行速度非常慢，记录设置超过2百万条记录
查询
db.testCollection.aggregate({
$match: {
active: {
$ne: false
}
}
}, {
$group: {
_id: {
productName: "$productName",
model: "$model",
version: "$version",
uid: "$uid"
},
total: {
$sum: 1
}
}
}, {
$project: {
total: 1,
model: "$_id.model",
version: "$_id.version",
uid: "$_id.uid",
productName: "$_id.productName"
}
}, {
$sort: {
model: 1
}
})
解释（）
{
"stages" : [
{
"$cursor" : {
"query" : {
"active" : {
"$ne" : false
}
},
"fields" : {
"version" : 1,
"productName" : 1,
"model" : 1,
"uid" : 1,
"_id" : 0
},
"queryPlanner" : {
"plannerVersion" : 1,
"namespace" : "fms2.device",
"indexFilterSet" : false,
"parsedQuery" : {
"$nor" : [
{
"active" : {
"$eq" : false
}
}
]
},
"winningPlan" : {
"stage" : "FETCH",
"inputStage" : {
"stage" : "IXSCAN",
"keyPattern" : {
"active" : 1
},
"indexName" : "active",
"isMultiKey" : false,
"multiKeyPaths" : {
"active" : [ ]
},
"isUnique" : false,
"isSparse" : false,
"isPartial" : false,
"indexVersion" : 2,
"direction" : "forward",
"indexBounds" : {
"active" : [
"[MinKey, false)",
"(false, MaxKey]"
]
}
}
},
"rejectedPlans" : [ ]
}
}
},
{
"$group" : {
"_id" : {
"productName" : "$productName",
"model" : "$model",
"version" : "$version",
"uid" : "$uid"
},
"total" : {
"$sum" : {
"$const" : 1
}
}
}
},
{
"$project" : {
"_id" : true,
"total" : true,
"model" : "$_id.model",
"version" : "$_id.version",
"uid" : "$_id.uid",
"productName" : "$_id.productName"
}
},
{
"$sort" : {
"sortKey" : {
"model" : 1
}
}
}
],
"ok" : 1
}
有没有办法更优化此查询？我也查看了https://docs.mongodb.com/manual/core/aggregation-pipeline-optimization/，但大多数陈述的建议都不适用于此查询。
不确定是否重要，此聚合的结果最终只有20-30条记录。