表空间容量查看与增加undo表空间

(2013-02-06 07:52:15)


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分类：oracle

--查看数据文件存放位置
select * from dba_data_files;

--手动更改表空间容量
ALTER DATABASE DATAFILE '/u02/oradata/undotbs02.dbf'
RESIZE 10000M;

--查看表空间容量
SELECT a.tablespace_name,
ROUND (a.total_size)"total_size(MB)",
ROUND (a.total_size) - ROUND(b.free_size, 3) "used_size(MB)",
ROUND (b.free_size, 3)"free_size(MB)",
ROUND (b.free_size /total_size * 100, 2) || '%' free_rate
FROM ( SELECT tablespace_name, SUM (bytes)/ 1024 / 1024 total_size
FROM dba_data_files
GROUP BY tablespace_name)a,
( SELECT tablespace_name, SUM(bytes) / 1024 / 1024 free_size
FROM dba_free_space
GROUP BY tablespace_name)b
WHERE a.tablespace_name =b.tablespace_name(+);