isdbgrid (database command数据库命令)

Definition定义

isdbgrid

This command verifies that a process is a mongos.此命令验证进程是否为mongos。

If you issue the isdbgrid command when connected to a mongos, the response document includes the isdbgrid field set to 1.如果您在连接到mongos时发出isdbgrid命令，响应文档中会包含设置为1的isdbgrids字段。

Compatibility兼容性

This command is available in deployments hosted in the following environments:此命令在以下环境中托管的部署中可用：

• MongoDB Atlas: The fully managed service for MongoDB deployments in the cloud：云中MongoDB部署的完全托管服务

• MongoDB Enterprise: The subscription-based, self-managed version of MongoDB：MongoDB的基于订阅的自我管理版本
• MongoDB Community: The source-available, free-to-use, and self-managed version of MongoDB：MongoDB的源代码可用、免费使用和自我管理版本

Syntax语法

The command has the following syntax:该命令具有以下语法：

db.runCommand(
   {
     isdbgrid: 1
   }
)

Output输出

The returned document is similar to the following:返回的文档类似于以下内容：

{ "isdbgrid" : 1, "hostname" : "app.example.net", "ok" : 1 }

If you issue the isdbgrid command when connected to a mongod, MongoDB returns an error document. 如果你在连接到mongod时发出isdbgrid命令，MongoDB会返回一个错误文档。The isdbgrid command is not available to mongod. isdbgrid命令对mongod不可用。The error document, however, also includes a line that reads "isdbgrid" : 1, just as in the document returned for a mongos. The error document is similar to the following:然而，错误文档中还包含一行"isdbgrid" : 1，就像在为mongos返回的文档中一样。错误文档类似于以下内容：

{
   "errmsg" : "no such cmd: isdbgrid",
   "bad cmd" : {
         "isdbgrid" : 1
   },
   "ok" : 0
}

You can instead use the hello command to determine connection to a mongos. When connected to a mongos, the hello command returns a document that contains the string isdbgrid in the msg field.您可以使用hello命令来确定与mongos的连接。当连接到mongos时，hello命令返回一个文档，该文档在msg字段中包含字符串isdbgrid。