The createIndex() method has the following form: db.collection.createIndex( <keys>, <options>, <commitQuorum>) The createIndex() method takes the following parameters: Parameter Type Description keys document A document that contains the field and value pairs where the field is the index key...
注意在3.0.0版本前创建索引方法为db.collection.ensureIndex(),之后的版本使用了db.collection.createIndex()方法,ensureIndex()还能用,但只是createIndex()的别名。 # 单字段索引示例,对 userid 字段按升序建立索引 > db.comment.createIndex({userid:1}) { "createdCollectionAutomatically" : false, "numIndexesB...
一、对于小数据量collection,可直接单命令行创建索引 类似如下操作: db.getCollection('processDataObj').createIndex({ 'flowNo':1 }, {}, 'majority') 二、对于大数据量collection,需执行后台创建的方式 如下是最佳实践脚本: 代码语言:txt AI代码解释 echo "定义变量..." COLLECT="processDataObjInit" INDEX=...
"id":20438,"ctx":"conn15536","msg":"Index build: registering","attr":{"buildUUID":{"uuid":{"$uuid":"c3fa6f65-337e-424e-95f0-a8081b60b5cc"}},"namespace":"miku.demo","collectionUUID":{"uuid":{"$uuid":"cc364994-d259-464e-bf7e-a02d4746f910"}},"indexes":1,"firstIndex"...
MongoDB使用 createIndex() 方法来创建索引。 注意在 3.0.0 版本前创建索引方法为 db.collection.ensureIndex(),之后的版本使用了 db.collection.createIndex() 方法,ensureIndex() 还能用,但只是 createIndex() 的别名。 语法 createIndex()方法基本语法格式如下所示: 语法中 Key 值为你要创建的索引字段,1 为指...
Create an Index Tip When you create indexes, keep the ratio of reads to writes on the target collection in mind. Indexes come with a performance cost, but are more than worth the cost for frequent queries on large data sets. Before you create an index, review the documentedindexing strateg...
db.<collection>.createIndex(<keys>,<options>) db.accountsWithIndex.createIndex({name:1}) //单键索引 db.accountsWithIndex.createIndex({name:1,balance:-1}) //复合索引 db.accountsWithIndex.createIndex({currency:1}) //多键索引 db.persons.createIndex({name:1},{partialFilterExpression:{age:...
"errmsg" : "E11000 duplicate key error collection: test.foo index: username_1 dup key: { : null }" } }) // 对多个字段创建唯一索引(关系数据库中的联合主键) db.foo.createIndex({"username": 1, "nickname": 1}, {"unique": true}) ...
Thedb.createCollection()method has the following prototype form: db.createCollection(<name>,{capped:<boolean>,autoIndexId:<boolean>,size:<number>,max:<number>,storageEngine:<document>,validator:<document>,validationLevel:<string>,validationAction:<string>,indexOptionDefaults:<document>,viewOn:<string...
ctx, cancel := context.WithTimeout(context.Background(),10*time.Second)defercancel() client, err := mongo.Connect(ctx, clientOptions)iferr !=nil{ log.Fatal("mongodb 连接失败,error:", err) }// 定义连接库和连接集合collection := client.Database("t_db").Collection("t_coll")// 定义要...