Quản lý Undo trong Oracle Database

select a.tablespace_name,   a.TOTAL_GB total_GB,   b.Used_GB Used_GB,   round(((b.Used_GB/a.TOTAL_GB)*100),2) Percent_USED   

    from

        (select tablespace_name,  sum(bytes)/1024/1024/1024 TOTAL_GB from dba_data_files   group by tablespace_name) a,

        (select tablespace_name, sum(bytes)/1024/1024/1024 Used_GB from DBA_UNDO_EXTENTS group by tablespace_name) b

    where a.tablespace_name=b.tablespace_name 

order by percent_used desc

--1/Create undo tablespace

CREATE SMALLFILE UNDO TABLESPACE "TUNDOTBS1" DATAFILE 

'/u03/oracle/oradata/DBAViet/tundo1_01.dbf' SIZE 10G REUSE , 

'/u03/oracle/oradata/DBAViet/tundo1_02.dbf' SIZE 10G REUSE , 

'/u03/oracle/oradata/DBAViet/tundo1_03.dbf' SIZE 10G REUSE , 

'/u03/oracle/oradata/DBAViet/tundo1_04.dbf' SIZE 10G REUSE , 

'/u03/oracle/oradata/DBAViet/tundo1_05.dbf' SIZE 10G REUSE , 

'/u03/oracle/oradata/DBAViet/tundo1_06.dbf' SIZE 10G REUSE , 

'/u03/oracle/oradata/DBAViet/tundo1_07.dbf' SIZE 10G REUSE , 

'/u03/oracle/oradata/DBAViet/tundo1_08.dbf' SIZE 10G REUSE  

CREATE SMALLFILE UNDO TABLESPACE "TUNDOTBS2" DATAFILE 

'/u03/oracle/oradata/DBAViet/tundo2_01.dbf' SIZE 10G REUSE , 

'/u03/oracle/oradata/DBAViet/tundo2_02.dbf' SIZE 10G REUSE , 

'/u03/oracle/oradata/DBAViet/tundo2_03.dbf' SIZE 10G REUSE , 

'/u03/oracle/oradata/DBAViet/tundo2_04.dbf' SIZE 10G REUSE , 

'/u03/oracle/oradata/DBAViet/tundo2_05.dbf' SIZE 10G REUSE , 

'/u03/oracle/oradata/DBAViet/tundo2_06.dbf' SIZE 10G REUSE , 

'/u03/oracle/oradata/DBAViet/tundo2_07.dbf' SIZE 10G REUSE , 

'/u03/oracle/oradata/DBAViet/tundo2_08.dbf' SIZE 10G REUSE 

-- 2/ Set new undo tablespace for each intance

ALTER SYSTEM SET undo_tablespace = TUNDOTBS1 SID='DBAViet1'

ALTER SYSTEM SET undo_tablespace = TUNDOTBS2 SID='DBAViet2'

-- 3/ DROP TABLESPACE UNDOTBS1_old including contents;

DROP TABLESPACE UNDOTBS1 including contents and datafiles;

DROP TABLESPACE UNDOTBS2 including contents and datafiles;

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