When you run a database command, you specify the command as a document to db.runCommand(). The document's key is the command to run, and the value is typically supplied as 1. The value does not affect the output of the command for example: db.runCommand( { hello: 1 } ) ...
There is no “create” command in the MongoDB Shell. In order to create a database, you will first need to switch the context to a non-existing database using theusecommand: xxxxxxxxxx 1 1 > use myshinynewdb Note that, for now, only the context has been changed. If you enter the...
db.commandHelp(name) returns the help for the command db.copyDatabase(fromdb, todb, fromhost) - deprecated db.createCollection(name, {size: ..., capped: ..., max: ...}) db.createView(name, viewOn, [{$operator: {...}}, ...], {viewOptions}) db.createUser(userDocument) db.cu...
MongoDBCommandPrompt+executeCommand(command)DataCollection+insert(data)+update(data)+delete(data)+query(query) 结论 通过本文的指导,刚入行的小白应该已经学会了如何使用 MongoDB 命令行创建数据表。首先,我们连接到 MongoDB 服务器;然后,选择要创建数据表的数据库;最后,使用db.createCollection()命令创建数据表。
1、创建Database 创建新数据库 use amitdb 这个时候输入show dbs,看不到我们新建的数据库amitdb,因为我们还没有在其中插入任何文档,Collections是包含大量文档的集合,这个相当于一个小数据库,它下面的文档是相当于MySQL中的table 2、创建Collections 首先打开数据库 ...
使用db.createCollection() 显式创建Collection,通过指定Collection Option,创建特定用途的Collection。 Because MongoDB creates a collection implicitly when the collection is first referenced in a command, this method is used primarily for creating new collections that use specific options. ...
db.commandHelp(name) returns the help for the command db.copyDatabase(fromdb, todb, fromhost) - deprecated db.createCollection(name, {size: ..., capped: ..., max: ...}) db.createView(name, viewOn, [{$operator: {...}}, ...], {viewOptions}) ...
4.2.6 command操作统计 前面五种操作统计都很好理解,commands统计由那些命令操作组成,本节将重点分析commands如何实现统计。commands统计核心代码实现如下: 1. 代理mongos commands统计核心代码实现: 1.//mongos代理commands统计 2.void execCommandDatabase(...) { 3. ... 4. if (command->shouldAffectCommand...
2、添加管理用户(mongoDB 没有无敌用户root,只有能管理用户的用户 userAdminAnyDatabase) 利用mongo命令连接mongoDB服务器端: > use admin switched to db admin > db.createUser( {user: "pfnieadmin",pwd: "123456",roles: [ { role: "userAdminAnyDatabase", db: "admin" } ]}); ...
db.adminCommand({currentOp: true,$or:[{op:"command","command.createIndexes":{$exists:true}},{op:"none","msg":/^Index Build/}]}) 返回如下图所示,msg字段指明当前创建索引的进度,locks字段代表该操作的锁类型。更多锁说明信息,请参见MongoDB 官网。