When specifying collation, the locale field is mandatory; all other collation fields are optional. For descriptions of the fields, see Collation Document. If you specify a collation at the collection level: Indexes on that collection will be created with that collation unless the index creation ope...
When specifying collation, the locale field is mandatory; all other collation fields are optional. For descriptions of the fields, see Collation Document. If you specify a collation at the collection level: Indexes on that collection will be created with that collation unless the index creation ope...
off: 关闭校验规则 strict: 默认值,表示MongoDB会对文档中的所有新增或更新操作进行验证 moderate: 表示MongoDB仅对已符合验证规则的现有文档进行新增,更改验证。对不符合验证规则的现有文档,MongoDB不会再检查其操作是否符合验证规则 示例 # db.createCollection() 搭配JSON Schema验证模式 # foodColor集合必须满足以下...
db.collection.countDocuments() db.collection.estimatedDocumentCount() db.collection.count() db.collection.distinct() 使用索引和排序操作 视图会使用基础集合(underlying collection)的索引 当索引是基于基础集合(underlying collection)的时候,你不能直接创建,删除或者重建视图的索引或者获取一个视图的索引列表 对于一...
You must remove several irrelevant fields in the preceding document, including the user, request, and status fields. You can also remove the time field because the _id field contains information about the access time. You can also retain the time field. This field indicates the time when the...
As with most database systems, MongoDB allows for the creation of indices on specific keys to be created for a collection. This can be used to reduce the time taken to execute certain types of queries. A salient feature of MongoDB is the ability to create indices on geospatial data keys...
If unspecified, MongoDB generates an index name by concatenating the names of the indexed fields and the sort order. Options specified to db.collection.createIndexes() apply to all of the index specifications included in the key pattern array. Since index names must be unique, you may only ...
db.myNewCollection3.createIndex( { y:1 } ) insertOne()和createIndex()操作都会分别创建对应的集合,如果它们不存在的话。 显式创建 MongoDB提供了db.createCollection()方法来显式创建一个集合,可以附带多个配置项,例如设置最大尺寸或者文档验证规则。如果没有指定这些选项,那么就不需要来显式地创建集合,因为...
db.myNewCollection3.createIndex( { y:1 } ) insertOne()和createIndex()操作都会分别创建对应的集合,如果它们不存在的话。 显式创建 MongoDB提供了db.createCollection()方法来显式创建一个集合,可以附带多个配置项,例如设置最大尺寸或者文档验证规则。如果没有指定这些选项,那么就不需要来显式地创建集合,因为...
description: “MongoSQL accesses MongoDB data with SQL” schema: path: ‘C:DemoCollection1.drdl’ Note: Specified directories must exist. Now, it’s time to install and activate this service. After moving the current directory to the BI connector binaries folder, open a command prompt as adm...