回收站
启用回收站
alter system set recyclebin=on scope=both;
查询回收站信息
dba_recyclebin
还原表的最新版本
flashbacktable confirm_tabletobeforedrop
重命名主键约束与INDEX约束
alter index "BIN$u9gKTHIDTbq0kZvyC92a+g==$0" rename to index_test;
alter table confirm_table rename constraint "BIN$gwv7RHO3TRS3XCtfUvHrbg==$0" to pk_test;