由于错误，我无法运行 Backup-SqlDatabase。我得到以下信息：
PS C:\Users\Mik> Backup-SqlDatabase
Backup-SqlDatabase : The 'Backup-SqlDatabase' command was found in the module 'SqlServer', but the module could not be
loaded. For more information, run 'Import-Module SqlServer'.
At line:1 char:1
+ Backup-SqlDatabase
+ ~~~~~~~~~~~~~~~~~~
+ CategoryInfo : ObjectNotFound: (Backup-SqlDatabase:String) [], CommandNotFoundException
+ FullyQualifiedErrorId : CouldNotAutoloadMatchingModule
我按照建议运行 Import-Module 并得到：
PS C:\Users\Mik> Import-Module SqlServer
Import-Module : The following error occurred while loading the extended type data file: Error in TypeData
"Microsoft.SqlServer.Management.Smo.NamedSmoObject": The member DefaultKeyPropertySet is already present.
Error in TypeData …