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MongoDB Generic Index
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| // 더미 데이터 생성 | |
| for (var i = 0; i < 100000; ++i) { | |
| var arr = []; | |
| var size = Math.floor(Math.random() * 10); | |
| for (var j = 0; j < size; ++j) { | |
| var doc = {}; | |
| doc["prop" + j] = Math.floor(Math.random() * 1000); | |
| arr.push(doc); | |
| } | |
| db.test.insert({ | |
| props: arr, | |
| activities: [ | |
| { | |
| "vote": Math.floor(Math.random() * 1000) | |
| }, | |
| { | |
| "comment": Math.floor(Math.random() * 100) | |
| } | |
| ], | |
| contents: [ | |
| { | |
| "title": "제목" | |
| }, | |
| { | |
| "contents": "내용" | |
| } | |
| ] | |
| }); | |
| } |
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| // 인덱스 추가 | |
| db.test.ensureIndex({"props": 1}, {sparse: true}); | |
| db.test.ensureIndex({"activities": 1}, {sparse: true}); | |
| // 기본 검색 | |
| db.test.find({"props": {"prop0": 0}}).skip(50).limit(3); | |
| db.test.find({"props": {"prop0": 0}}).skip(50).limit(3).explain(); |
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| // find로는 임베디드 엘리먼트를 검색할 때는 소팅이 안먹으므로, aggregate를 이용해야한다. | |
| db.test.aggregate([ | |
| {$match: {"props": {"prop0": 0}}}, | |
| {$sort: {"activities.vote": -1}}, | |
| {$skip: 50}, | |
| {$limit: 3} | |
| ]); | |
| // 쿼리에 조건식 넣기 | |
| db.test.aggregate([ | |
| {$match: {"props": {$in: [{"prop0": 0}, {"prop0": 1}]}}}, | |
| {$sort: {"activities.vote": -1}} | |
| ]); | |
| db.test.aggregate([ | |
| {$match: {"props": {$all: [{"prop0": 0}, {"prop1": 50}]}}}, | |
| {$sort: {"activities.vote": -1}} | |
| ]); | |
| // 조금 더 복잡한 쿼리 | |
| db.test.aggregate([ | |
| {$match: {$and: [ | |
| {"props": {$in: [{"prop0": 0}, {"prop0": 1}]}}, | |
| {"props": {$in: [{"prop1": 1}, {"prop1": 2}]}} | |
| ]}}, | |
| {$sort: {"activities.vote": -1}}, | |
| {$project: { | |
| "_id": "$_id", | |
| "prop": "$props.prop0", | |
| "vote": "$activities.vote", | |
| "contents": "$contents" | |
| }}, | |
| {$skip: 0}, | |
| {$limit: 3} | |
| ]); |
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| { | |
| "_id": "54d035ac8b3ce67ad959c721", | |
| "created_at": "2015-02-05T02:31:33.462Z", | |
| "prop": [ | |
| { | |
| "type": 123 | |
| }, | |
| { | |
| "user_id": 345 | |
| } | |
| ... | |
| ], | |
| "activities": [ | |
| { | |
| "vote": 10 | |
| }, | |
| { | |
| "comment": 123 | |
| } | |
| ... | |
| ], | |
| "contents": [ | |
| { | |
| "title": "제목" | |
| }, | |
| { | |
| "contents": "내용" | |
| } | |
| ... | |
| ] | |
| } |
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