ping

Definition定义

ping

The ping command is a no-op used to test whether a server is responding to commands. This command will return immediately even if the server is write-locked:ping命令是一个非操作，用于测试服务器是否响应命令。即使服务器被写锁定，此命令也会立即返回：

Syntax语法

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

db.runCommand(
   {
     ping: 1
   }
)

The value (e.g. 1 above) does not impact the behavior of the command.该值（例如，上面的1）不会影响命令的行为。