我已经运行了几周的mongo测试服务器，一切都很顺利。我有一个查询来获取已删除文件的计数，它在1.4秒文档（44 gb数据）的1秒范围内运行。今天，所有突然相同的查询都需要一段时间。当在查询查询上运行解释时，它显示它正在使用到位的索引，但它仍然需要很长时间。奇怪的是，这不是唯一一个看起来这样做的查询。如果我运行一个返回1项的查询，它几乎是瞬间完成的。当它返回一组文件时，它需要永远（多分钟）。下面是Mongo shell的查询和解释输出。我已经删除了被拒绝的节省空间的计划，但如果需要可以把它放回去。我是mongo的新手所以非常感谢任何帮助。我有另一个查询，我一直在等待24分钟，这只是在EventID字段上搜索，这是一个索引字段。
db.EventEntries.find({IsDelete:true, TimeCreated:{$gte:ISODate('2017-06-30')}}).explain('executionStats')
{
"queryPlanner" : {
"plannerVersion" : 1,
"namespace" : "Events.EventEntries",
"indexFilterSet" : false,
"parsedQuery" : {
"$and" : [
{
"IsDelete" : {
"$eq" : true
}
},
{
"TimeCreated" : {
"$gte" : ISODate("2017-06-30T00:00:00Z")
}
}
]
},
"winningPlan" : {
"stage" : "FETCH",
"inputStage" : {
"stage" : "IXSCAN",
"keyPattern" : {
"IsDelete" : 1,
"TimeCreated" : 1
},
"indexName" : "IsDelete_1_TimeCreated_1",
"isMultiKey" : true,
"multiKeyPaths" : {
"IsDelete" : [ ],
"TimeCreated" : [
"TimeCreated"
]
},
"isUnique" : false,
"isSparse" : false,
"isPartial" : false,
"indexVersion" : 2,
"direction" : "forward",
"indexBounds" : {
"IsDelete" : [
"[true, true]"
],
"TimeCreated" : [
"[new Date(1498780800000), new Date(9223372036854775807)]"
]
}
}
},
},
"executionStats" : {
"executionSuccess" : true,
"nReturned" : 138570,
"executionTimeMillis" : 177933,
"totalKeysExamined" : 138570,
"totalDocsExamined" : 138570,
"executionStages" : {
"stage" : "FETCH",
"nReturned" : 138570,
"executionTimeMillisEstimate" : 177834,
"works" : 138571,
"advanced" : 138570,
"needTime" : 0,
"needYield" : 0,
"saveState" : 8887,
"restoreState" : 8887,
"isEOF" : 1,
"invalidates" : 0,
"docsExamined" : 138570,
"alreadyHasObj" : 0,
"inputStage" : {
"stage" : "IXSCAN",
"nReturned" : 138570,
"executionTimeMillisEstimate" : 561,
"works" : 138571,
"advanced" : 138570,
"needTime" : 0,
"needYield" : 0,
"saveState" : 8887,
"restoreState" : 8887,
"isEOF" : 1,
"invalidates" : 0,
"keyPattern" : {
"IsDelete" : 1,
"TimeCreated" : 1
},
"indexName" : "IsDelete_1_TimeCreated_1",
"isMultiKey" : true,
"multiKeyPaths" : {
"IsDelete" : [ ],
"TimeCreated" : [
"TimeCreated"
]
},
"isUnique" : false,
"isSparse" : false,
"isPartial" : false,
"indexVersion" : 2,
"direction" : "forward",
"indexBounds" : {
"IsDelete" : [
"[true, true]"
],
"TimeCreated" : [
"[new Date(1498780800000), new Date(9223372036854775807)]"
]
},
"keysExamined" : 138570,
"seeks" : 1,
"dupsTested" : 138570,
"dupsDropped" : 0,
"seenInvalidated" : 0
}
}
},
"serverInfo" : {
"host" : "",
"port" : ,
"version" : "3.4.4",
"gitVersion" : "888390515874a9debd1b6c5d36559ca86b44babd"
},
"ok" : 1
}