解決Oracle下的undo空間過大的問題

    -- 假如undo表空間undotbs不能釋放空間,重建之

    -- 創建備用undo表空間
    create undo tablespace newundotbs datafile '$ORA_DATA/newundotbs01.dbf' size 1000m
    /   
    -- 切換undo表空間
    alter system set undo_tablespace=newundotbs scope=spfile
    /
    shutdown immediate
    /
    startup
    /
    -- drop原表空間
    drop tablespace undotbs including contents and datafiles
    /
    -- 創建原undo表空間
    create undo tablespace undotbs datafile '$ORA_DATA/undotbs01.dbf' size 1000m
    /
    -- 切換undo表空間
    alter system set undo_tablespace=undotbs scope=spfile
    /
    -- 關閉重起並把備用undo表空間drop
    shutdown immediate
    /
    startup
    /
    drop tablespace newundotbs including contents and datafiles
    /