If you attempt to add a new database to the mirror on a nonprimary member that was not created as a mirrored database on the primary, but rather added to the mirror after it was created, an error message notes this and you cannot complete the operation.
注意:不要对 IRIS IRIS.DAT 数据库文件使用 Windows 文件压缩。 (通过右键单击 Windows 资源管理器中的文件或文件夹并选择属性,然后选择高级,然后压缩内容以节省磁盘空间来压缩文件;压缩后,文件夹名称或文件名在 Windows 资源管理器中呈现为蓝色。)如果压缩一个IRIS.DAT 文件,它所属的实例将无法启动,并出现误导性错误。