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
创建索引 db.collection.createIndex() 语法: db.collection.createIndex(keys, options, commitQuorum) keys 文档指定创建索引的字段 > db.accuntsWithIndex.find() { "_id" : ObjectId("635f20261b8b77383133f018"), "name" : "alice", "balance" : 50, "currency" : [ "GBP", "USD" ] } { ...
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=...
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:...
"collectionUUID":{"uuid":{"$uuid":"cc364994-d259-464e-bf7e-a02d4746f910"}},"indexes":1,"firstIndex":{"name":"age_-1_name_1"},"command":{"createIndexes":"demo","v":2,"indexes":[{"name":"age_-1_name_1","key":{"age":-1,"name":1}}],"ignoreUnknownIndexOptions":...
db.createCollection() 另请参阅隐式创建操作。 createIndexes db.collection.createIndex() db.collection.createIndexes() 要创建的索引必须位于不存在的集合上(在这种情况下,该集合是作为操作的一部分创建的),或者位于先前在同一事务中新创建的空集合上。
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...
(1) 细致到collection的显示:sh.status() (2)仅显示分片: use config; db.shards.find() { "_id" : "shard0000", "host" : "xxhost:10001" } { "_id" : "shard0001", "host" : "yyhost:10002" } ... (3) use admin db.runCommand({listshards: 1}) 列出...
要创建 2d 索引,请使用db.collection.createIndex()方法。 索引类型为"2d": db.<collection>.createIndex( {<locationfield>: "2d" } ) 关于此任务 <location field>中的值必须是legacy coordinate pairs。 指定传统坐标对时,首先列出经度,然后列出纬度。