mongo聚合查询-创新互联

*****************未加索引******************************************

在弋阳等地区，都构建了全面的区域性战略布局，加强发展的系统性、市场前瞻性、产品创新能力，以专注、极致的服务理念，为客户提供成都网站设计、成都做网站 网站设计制作按需求定制开发,公司网站建设,企业网站建设,品牌网站制作,成都营销网站建设,外贸网站制作,弋阳网站建设费用合理。

> var startTime = new Date();

> db.temMinlog.find({"id":0}).count();

1215

>  (new Date().getTime()-startTime.getTime())/1000

194.811s

******************加索引*****************************************

> db.temMinlog.ensureIndex({"_id":1,"id":1});

{

"createdCollectionAutomatically" : false,

"numIndexesBefore" : 1,

"numIndexesAfter" : 2,

"ok" : 1

}

******************加索引后查询*****************************************

> var startTime = new Date();

> db.temMinlog.find({"id":0}).count();

1215

>  (new Date().getTime()-startTime.getTime())/1000

227.247s

时间范围检索

db.temMinlog.find({"_id":{$gte:1498703926535,$lte:1498704749897},"id":0}).explain("executionStats");

结果"executionStats" : {

"executionSuccess" : true,

"nReturned" : 52,

"executionTimeMillis" : 9506,

"totalKeysExamined" : 518000,

"totalDocsExamined" : 52,

"executionStages" : {

"stage" : "FETCH",

"nReturned" : 52,

"executionTimeMillisEstimate" : 2175,

"works" : 518001,

"advanced" : 52,

"needTime" : 517947,

"needYield" : 0,

"saveState" : 8151,

"restoreState" : 8151,

"isEOF" : 1,

"invalidates" : 0,

"docsExamined" : 52,

"alreadyHasObj" : 0,

"inputStage" : {

"stage" : "IXSCAN",

"nReturned" : 52,

"executionTimeMillisEstimate" : 2145,

模糊查询

db.temMinlog.find({"_id":{$gte:1498703926535,$lte:1498704749897},"id":/0/}).explain("executionStats");

结果 "executionStats" : {

"executionSuccess" : true,

"nReturned" : 1,

"executionTimeMillis" : 9893,

"totalKeysExamined" : 518001,

"totalDocsExamined" : 1,

"executionStages" : {

"stage" : "FETCH",

"nReturned" : 1,

"executionTimeMillisEstimate" : 2237,

"works" : 518002,

"advanced" : 1,

"needTime" : 517999,

"needYield" : 0,

"saveState" : 8151,

"restoreState" : 8151,

"isEOF" : 1,

"invalidates" : 0,

"docsExamined" : 1,

"alreadyHasObj" : 0,

"inputStage" : {

"stage" : "IXSCAN",

"filter" : {

"id" : {

"$regex" : "0"

}

},

"nReturned" : 1,

"executionTimeMillisEstimate" : 2185,

模糊count（）

> var startTime = new Date();

> db.temMinlog.find({"_id":{$gte:1498703926535,$lte:1498704749897},"id":{$in:[1,2,3]}}).count();

156

> (new Date().getTime()-startTime.getTime())/1000

11.232s

*************************group by 统计*************************************

db.temMinlog.aggregate([{$group:{_id:"$id",num_tutorial:{$sum:1}}}]);

db.temMinlog.aggregate([{$group:{_id:"$id",max_v0:{$max:"$v0"},min_v1:{$min:"$v1"},count:{$sum:1}}}],{ allowDiskUse: true });

db.temMinlog.aggregate([{$group:{_id:"$id",max_v0:{$max:"$v0"},min_v1:{$min:"$v1"},avg_v2:{$avg:"$v2"},count:{$sum:1}}}],{ allowDiskUse: true });

db.temMinlog.aggregate([{$match:{_id:{$gte:1498703926535,$lte:1498704749897}}},{$group:{_id:"$id",max_v0:{$max:"$v0"},min_v1:{$min:"$v1"},avg_v2:{$avg:"$v2"},sum_v2:{$sum:"$v2"},count:{$sum:1}}}],{ allowDiskUse: true });

结果：12.194s

db.temMinlog.aggregate([{$match:{_id:{$gte:1498703926535,$lte:1498704749897}}},{$limit:5},{$group:{_id:"$id",max_v0:{$max:"$v0"},min_v1:{$min:"$v1"},avg_v2:{$avg:"$v2"},sum_v2:{$sum:"$v2"},count:{$sum:1}}},{$sort:{_id:-1}}],{ allowDiskUse: true });

$match：匹配条件，可选

$limit：结果条数，可选

$group：聚合规则

$sort：对查询结果排序，-1表示降序

db.temMinlog.aggregate([{$match:{_id:{$gte:1498703926535,$lte:1498704749897}}},{$group:{_id:"$id",max_v0:{$max:"$v0"},min_v1:{$min:"$v1"},avg_v2:{$avg:"$v2"},sum_v2:{$sum:"$v2"},count:{$sum:1}}},{$limit:5},{$sort:{_id:-1}}]);

结果：21.048s

另外有需要云服务器可以了解下创新互联scvps.cn，海内外云服务器15元起步，三天无理由+7*72小时售后在线，公司持有idc许可证，提供“云服务器、裸金属服务器、高防服务器、香港服务器、美国服务器、虚拟主机、免备案服务器”等云主机租用服务以及企业上云的综合解决方案，具有“安全稳定、简单易用、服务可用性高、性价比高”等特点与优势，专为企业上云打造定制，能够满足用户丰富、多元化的应用场景需求。

本文名称：mongo聚合查询-创新互联
URL网址：http://jkwzsj.com/article/jdsoi.html