flashback off下delete和update表的恢复(flashback query技术)
SQL>createtableemp(idnumber,namevarchar2(100),salarynumber);Tablecreated.SQL>insertintoempvalues(1,'zhang',100);1rowcreated.SQL>insertintoempvalues(2,'jiao',100);1rowcreated.SQL>commit;Commitcomplete.