打开虚拟盘文件in7.vmdk 失败.
Could not get the storage format of the medium 7\win7.vmdk (VERR_NOT_SUPPORTED).
返回 代码:VBOX_E_IPRT_ERROR (0X80BB0005) 组件:MediumWrap 界面:IMedium {a a3f2dfb1} 被召者:IVirtualBox {768 cd607} 被召者 RC:VBOX_E_OBJECT_NOT_F…
1.创建测试表及谓词条件中包含is null模拟语句 create table t641 as select * from dba_objects; set autot trace select SUBOBJECT_NAME,OBJECT_NAME from t641 where OBJECT_NAMEWRI$_OPTSTAT_SYNOPSIS$ and SUBOBJECT_NAME is null; 2.全表扫描逻辑读1237 3.创建等值谓词条…