问题描述
db.users.explain('executionStats').find({"$text": {"$search" : "\"a b c d\"",$language: 'none'}}).finish()
显示返回的文档数量非常多。它还表明 parsedTextQuery 既有字词又有词组，而我打算只搜索一个词组。我在这里做错了什么？
{
"queryPlanner": {
"plannerVersion": 1,"namespace": "settlin.users","indexFilterSet": false,"parsedQuery": {
"$text": {
"$search": "\"a b c d\"","$language": "none","$caseSensitive": false,"$diacriticSensitive": false
}
},"winningPlan": {
"stage": "TEXT","indexPrefix": {},"indexName": "text","parsedTextQuery": {
"terms": [
"a","b","c","d"
],"negatedTerms": [],"phrases": [
"a b c d"
],"negatedPhrases": []
},"textIndexVersion": 3,"inputStage": {
"stage": "TEXT_MATCH","inputStage": {
"stage": "FETCH","inputStage": {
"stage": "OR","inputStages": [
{
"stage": "IXSCAN","keyPattern": {
"_fts": "text","_ftsx": 1
},"ismultikey": true,"isUnique": false,"issparse": false,"isPartial": false,"indexVersion": 2,"direction": "backward","indexBounds": {}
},{
"stage": "IXSCAN","indexBounds": {}
}
]
}
}
}
},"rejectedplans": []
},"executionStats": {
"executionSuccess": true,"nReturned": 0,"executionTimeMillis": 146,"totalKeysexamined": 20086,"totalDocsexamined": 20046,"executionStages": {
"stage": "TEXT","executionTimeMillisEstimate": 100,"works": 20090,"advanced": 0,"needTime": 20089,"needYield": 0,"saveState": 20,"restoreState": 20,"iSEOF": 1,"docsRejected": 20046,"nReturned": 20046,"executionTimeMillisEstimate": 65,"advanced": 20046,"needTime": 43,"docsexamined": 20046,"alreadyHasObj": 0,"executionTimeMillisEstimate": 32,"dupsTested": 20086,"dupsDropped": 40,"executionTimeMillisEstimate": 0,"works": 1,"needTime": 0,"indexBounds": {},"keysexamined": 0,"seeks": 1,"dupsTested": 0,"dupsDropped": 0
},"nReturned": 1872,"executionTimeMillisEstimate": 3,"works": 1873,"advanced": 1872,"keysexamined": 1872,"dupsTested": 1872,"nReturned": 8442,"executionTimeMillisEstimate": 8,"works": 8443,"advanced": 8442,"keysexamined": 8442,"dupsTested": 8442,"nReturned": 9772,"executionTimeMillisEstimate": 17,"works": 9773,"advanced": 9772,"keysexamined": 9772,"dupsTested": 9772,"dupsDropped": 0
}
]
}
}
}
}
},"serverInfo": {
"host": "ip-172-31-18-236","port": 27456,"version": "4.4.5","gitVersion": "ff5cb77101b052fa02da43b8538093486cf9b3f7"
},"ok": 1,"$clusterTime": {
"clusterTime": {
"$timestamp": {
"t": 1618055036,"i": 1
}
},"signature": {
"hash": {
"$binary": "Ci2LVQ02hJS7zcsWMmXP+TBZKeU=","$type": "00"
},"keyId": {
"$numberLong": "6896103437256097794"
}
}
},"operationTime": {
"$timestamp": {
"t": 1618055036,"i": 1
}
}
}
解决方法
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