Solve the problem of too much undo space under Oracle

-- 如果undo表空间undotbs不能释放空间,重建之
-- 创建备用undo表空间

create undo tablespace newundotbs datafile '$ORA_DATA/newundotbs01.dbf' size 1000m
/
-- 切换undo表空间
alter system set undo_tablespace=newundotbs scope=spfile
/
shutdown immediate
/
startup
/
-- drop原表空间
drop tablespace undotbs including contents and datafiles
/
-- 创建原undo表空间
create undo tablespace undotbs datafile '$ORA_DATA/undotbs01.dbf' size 1000m
/
-- 切换undo表空间
alter system set undo_tablespace=undotbs scope=spfile
/
-- 关闭重起并把备用undo表空间drop
shutdown immediate
/
startup
/
drop tablespace newundotbs including contents and datafiles
/