0
MongoDBが新しく、1つのノードをかなり大きなデータベースでセットアップしようとしました。 1億行、140GB、10フィールド。 2つまたは3つのフィールドを組み合わせる多くの異なるクエリを計画しているため、1つを除くすべてのフィールドは別々のインデックスを持ちます。MongoDBの2つのフィールドの検索は、1つのフィールドの検索と比較して非常に遅いです。
私の問題は、MongoDBが複合検索で別々のインデックスを使用していないように見えることです。
db.alldata.find({ p: "степанович" })
この検索では1秒未満で応答します。
db.alldata.find({ n: "иван" })
こちらも。
しかしdb.alldata.find（{N： "иван"、P： "степанович"}）
が完了するまで永久にかかります。私は何か間違っているのですか？我々はあまりにも多くの異なるクエリを持っているとさえ別のインデックスは、ほぼすべてのRAM（50ギガバイト）を取るので、私は組み合わせインデックスを使用したくない
インデックスが作成です。そしてそこにははで十分です。 OSはCentOS7、FSはxfsです（重要な場合）。
UPDATE：
db.alldata.find({ n: "иван", p: "степанович"}).explain("allPlansExecution")
{
"queryPlanner" : {
"plannerVersion" : 1,
"namespace" : "myDb.alldata",
"indexFilterSet" : false,
"parsedQuery" : {
"$and" : [
{
"n" : {
"$eq" : "иван"
}
},
{
"p" : {
"$eq" : "степанович"
}
}
]
},
"winningPlan" : {
"stage" : "FETCH",
"filter" : {
"n" : {
"$eq" : "иван"
}
},
"inputStage" : {
"stage" : "IXSCAN",
"keyPattern" : {
"p" : 1
},
"indexName" : "parentalName",
"isMultiKey" : false,
"isUnique" : false,
"isSparse" : false,
"isPartial" : false,
"indexVersion" : 1,
"direction" : "forward",
"indexBounds" : {
"p" : [
"[\"степанович\", \"степанович\"]"
]
}
}
},
"rejectedPlans" : [
{
"stage" : "FETCH",
"filter" : {
"p" : {
"$eq" : "степанович"
}
},
"inputStage" : {
"stage" : "IXSCAN",
"keyPattern" : {
"n" : 1
},
"indexName" : "firstName",
"isMultiKey" : false,
"isUnique" : false,
"isSparse" : false,
"isPartial" : false,
"indexVersion" : 1,
"direction" : "forward",
"indexBounds" : {
"n" : [
"[\"иван\", \"иван\"]"
]
}
}
},
{
"stage" : "FETCH",
"filter" : {
"$and" : [
{
"n" : {
"$eq" : "иван"
}
},
{
"p" : {
"$eq" : "степанович"
}
}
]
},
"inputStage" : {
"stage" : "AND_SORTED",
"inputStages" : [
{
"stage" : "IXSCAN",
"keyPattern" : {
"n" : 1
},
"indexName" : "firstName",
"isMultiKey" : false,
"isUnique" : false,
"isSparse" : false,
"isPartial" : false,
"indexVersion" : 1,
"direction" : "forward",
"indexBounds" : {
"n" : [
"[\"иван\", \"иван\"]"
]
}
},
{
"stage" : "IXSCAN",
"keyPattern" : {
"p" : 1
},
"indexName" : "parentalName",
"isMultiKey" : false,
"isUnique" : false,
"isSparse" : false,
"isPartial" : false,
"indexVersion" : 1,
"direction" : "forward",
"indexBounds" : {
"p" : [
"[\"степанович\", \"степанович\"]"
]
}
}
]
}
}
]
},
"executionStats" : {
"executionSuccess" : true,
"nReturned" : 31,
"executionTimeMillis" : 213504,
"totalKeysExamined" : 124244,
"totalDocsExamined" : 124244,
"executionStages" : {
"stage" : "FETCH",
"filter" : {
"n" : {
"$eq" : "иван"
}
},
"nReturned" : 31,
"executionTimeMillisEstimate" : 13160,
"works" : 124246,
"advanced" : 31,
"needTime" : 124213,
"needYield" : 0,
"saveState" : 11965,
"restoreState" : 11965,
"isEOF" : 1,
"invalidates" : 0,
"docsExamined" : 124244,
"alreadyHasObj" : 0,
"inputStage" : {
"stage" : "IXSCAN",
"nReturned" : 124244,
"executionTimeMillisEstimate" : 240,
"works" : 124245,
"advanced" : 124244,
"needTime" : 0,
"needYield" : 0,
"saveState" : 11965,
"restoreState" : 11965,
"isEOF" : 1,
"invalidates" : 0,
"keyPattern" : {
"p" : 1
},
"indexName" : "parentalName",
"isMultiKey" : false,
"isUnique" : false,
"isSparse" : false,
"isPartial" : false,
"indexVersion" : 1,
"direction" : "forward",
"indexBounds" : {
"p" : [
"[\"степанович\", \"степанович\"]"
]
},
"keysExamined" : 124244,
"dupsTested" : 0,
"dupsDropped" : 0,
"seenInvalidated" : 0
}
},
"allPlansExecution" : [
{
"nReturned" : 18,
"executionTimeMillisEstimate" : 196410,
"totalKeysExamined" : 124245,
"totalDocsExamined" : 124245,
"executionStages" : {
"stage" : "FETCH",
"filter" : {
"p" : {
"$eq" : "степанович"
}
},
"nReturned" : 18,
"executionTimeMillisEstimate" : 196410,
"works" : 124245,
"advanced" : 18,
"needTime" : 124227,
"needYield" : 0,
"saveState" : 11965,
"restoreState" : 11965,
"isEOF" : 0,
"invalidates" : 0,
"docsExamined" : 124245,
"alreadyHasObj" : 0,
"inputStage" : {
"stage" : "IXSCAN",
"nReturned" : 124245,
"executionTimeMillisEstimate" : 240,
"works" : 124245,
"advanced" : 124245,
"needTime" : 0,
"needYield" : 0,
"saveState" : 11965,
"restoreState" : 11965,
"isEOF" : 0,
"invalidates" : 0,
"keyPattern" : {
"n" : 1
},
"indexName" : "firstName",
"isMultiKey" : false,
"isUnique" : false,
"isSparse" : false,
"isPartial" : false,
"indexVersion" : 1,
"direction" : "forward",
"indexBounds" : {
"n" : [
"[\"иван\", \"иван\"]"
]
},
"keysExamined" : 124245,
"dupsTested" : 0,
"dupsDropped" : 0,
"seenInvalidated" : 0
}
}
},
{
"nReturned" : 13,
"executionTimeMillisEstimate" : 540,
"totalKeysExamined" : 124245,
"totalDocsExamined" : 13,
"executionStages" : {
"stage" : "FETCH",
"filter" : {
"$and" : [
{
"n" : {
"$eq" : "иван"
}
},
{
"p" : {
"$eq" : "степанович"
}
}
]
},
"nReturned" : 13,
"executionTimeMillisEstimate" : 540,
"works" : 124245,
"advanced" : 13,
"needTime" : 124232,
"needYield" : 0,
"saveState" : 11965,
"restoreState" : 11965,
"isEOF" : 0,
"invalidates" : 0,
"docsExamined" : 13,
"alreadyHasObj" : 0,
"inputStage" : {
"stage" : "AND_SORTED",
"nReturned" : 13,
"executionTimeMillisEstimate" : 490,
"works" : 124245,
"advanced" : 13,
"needTime" : 124232,
"needYield" : 0,
"saveState" : 11965,
"restoreState" : 11965,
"isEOF" : 0,
"invalidates" : 0,
"flagged" : 0,
"failedAnd_0" : 29865,
"failedAnd_1" : 29858,
"inputStages" : [
{
"stage" : "IXSCAN",
"nReturned" : 74468,
"executionTimeMillisEstimate" : 250,
"works" : 74468,
"advanced" : 74468,
"needTime" : 0,
"needYield" : 0,
"saveState" : 11965,
"restoreState" : 11965,
"isEOF" : 0,
"invalidates" : 0,
"keyPattern" : {
"n" : 1
},
"indexName" : "firstName",
"isMultiKey" : false,
"isUnique" : false,
"isSparse" : false,
"isPartial" : false,
"indexVersion" : 1,
"direction" : "forward",
"indexBounds" : {
"n" : [
"[\"иван\", \"иван\"]"
]
},
"keysExamined" : 74468,
"dupsTested" : 0,
"dupsDropped" : 0,
"seenInvalidated" : 0
},
{
"stage" : "IXSCAN",
"nReturned" : 49777,
"executionTimeMillisEstimate" : 150,
"works" : 49777,
"advanced" : 49777,
"needTime" : 0,
"needYield" : 0,
"saveState" : 11965,
"restoreState" : 11965,
"isEOF" : 0,
"invalidates" : 0,
"keyPattern" : {
"p" : 1
},
"indexName" : "parentalName",
"isMultiKey" : false,
"isUnique" : false,
"isSparse" : false,
"isPartial" : false,
"indexVersion" : 1,
"direction" : "forward",
"indexBounds" : {
"p" : [
"[\"степанович\", \"степанович\"]"
]
},
"keysExamined" : 49777,
"dupsTested" : 0,
"dupsDropped" : 0,
"seenInvalidated" : 0
}
]
}
}
},
{
"nReturned" : 31,
"executionTimeMillisEstimate" : 13160,
"totalKeysExamined" : 124244,
"totalDocsExamined" : 124244,
"executionStages" : {
"stage" : "FETCH",
"filter" : {
"n" : {
"$eq" : "иван"
}
},
"nReturned" : 31,
"executionTimeMillisEstimate" : 13160,
"works" : 124245,
"advanced" : 31,
"needTime" : 124213,
"needYield" : 0,
"saveState" : 11965,
"restoreState" : 11965,
"isEOF" : 1,
"invalidates" : 0,
"docsExamined" : 124244,
"alreadyHasObj" : 0,
"inputStage" : {
"stage" : "IXSCAN",
"nReturned" : 124244,
"executionTimeMillisEstimate" : 240,
"works" : 124245,
"advanced" : 124244,
"needTime" : 0,
"needYield" : 0,
"saveState" : 11965,
"restoreState" : 11965,
"isEOF" : 1,
"invalidates" : 0,
"keyPattern" : {
"p" : 1
},
"indexName" : "parentalName",
"isMultiKey" : false,
"isUnique" : false,
"isSparse" : false,
"isPartial" : false,
"indexVersion" : 1,
"direction" : "forward",
"indexBounds" : {
"p" : [
"[\"степанович\", \"степанович\"]"
]
},
"keysExamined" : 124244,
"dupsTested" : 0,
"dupsDropped" : 0,
"seenInvalidated" : 0
}
}
}
]
},
"serverInfo" : {
"host" : "cass",
"port" : 27017,
"version" : "3.2.4",
"gitVersion" : "e2ee9ffcf9f5a94fad76802e28cc978718bb7a30"
},
"ok" : 1
}
あなたの投稿を説明結果で更新してください。 'db.alldata.find（{n："иван "、p："степанович "}）。explain（" allPlansExecution "）'。また、MongoDBのバージョンと、mmapまたはwiredtigerエンジンを使用している場合についても言及してください。 – Saleem
公式のrepoとwiredTigerから "3.2.4"。 allPlansExecutionを追加しました。 –
ありがとうございます。 'collection.getIndexes（）'からも私に出力を送ってください。 – Saleem