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参考：
一、基础查询
1、查看表空间大小，文件位置，是否自动增长：
select * from dba_data_file
2、查看表空间设置信息：
select * from dba_tablespaces
3、查看表空间剩余空间信息：
select * from dba_free_space
4、查看用户表空间信息：
select * from user_indexes
二、扩展查询
--查询表空间的总容量
select tablespace_name,sum(bytes) /1024/1024 as MB from dba_data_files group by tablespace_name;
--查询表空间使用率
select total.tablespace_name,
round(total.MB, 2) as Total_MB,
round(total.MB - free.MB, 2) as Used_MB,
round((1 - free.MB / total.MB) * 100, 2) || ‘%‘ as Used_Pct from
(select tablespace_name,sum(bytes) / 1024 / 1024 as MB from dba_free_space group by tablespace_name) free,
(select tablespace_name,sum(bytes) / 1024 / 1024 as MB from dba_data_files group by tablespace_name) total
where free.tablespace_name = total.tablespace_name order by used_pct desc;
--SQL计算出某个用户下所有对象的大小
select owner,segment_name,segment_type,partition_name,bytes from dba_segments where wner=‘CCARE‘;
--我们经常使用的LEO1表空间使用情况已经perfect显示，现在我们需要统计的是LEO1表空间包含对象的大小，由于记录数较多，只把SQL语句写在这里了
select o.object_name,o.object_type,o.owner,s.tablespace_name,s.segment_name,s.bytes from dba_objects o,dba_segments s where s.tablespace_name=‘LEO1‘ and o.owner=s.owner and o.owner=‘LEO1‘ and o.object_type=s.segment_type;
--(1)重置数据文件大小
ALTER DATABASE DATAFILE ‘datafile路径名字‘ RESIZE 2000M；
--(2)设置数据文件能自动增长
ALTER DATABASE DATAFILE ‘... ‘ AUTOEXTEND ON | OFF NEXT 20MMAXSIZE 300M;
--查看哪些表空间为自动增长
SELECT FILE_NAME,TABLESPACE_NAME,AUTOEXTENSIBLE FROMdba_data_files;
/* (3)添加数据文件
增加到表空间中的数据文件不能直接从表空间中删除，除非删掉整个表空间
增加数据文件将有助于均衡I/O
一个表空间文件最多为个，文件越多，执行一次检查点的代价越高 */
ALTER TABLESPACE tablespace_name ADD DATAFILE ‘...‘ SIZE XX;
ALTER TABLESPACE tbs2 ADD DATAFILE‘/u01/app/oracle/oradata/orcl/tbs2.dbf‘ size 200m autoextend on ;
--1、查看表空间的名称及大小
SELECT t.tablespace_name, round(SUM(bytes / (1024 * 1024)), 0) ts_size
FROM dba_tablespaces t, dba_data_files d
WHERE t.tablespace_name = d.tablespace_name
GROUP BY t.tablespace_name;
--2、查看表空间物理文件的名称及大小
SELECT tablespace_name,
file_id,
file_name,
round(bytes / (1024 * 1024), 0) total_space
FROM dba_data_files
ORDER BY tablespace_name;
--3、查看回滚段名称及大小
SELECT segment_name,
tablespace_name,
r.status,
(initial_extent / 1024) initialextent,
(next_extent / 1024) nextextent,
max_extents,
v.curext curextent
FROM dba_rollback_segs r, v$rollstat v
WHERE r.segment_id = v.usn(+)
ORDER BY segment_name;
--4、查看控制文件
SELECT NAME FROM v$controlfile;
--5、查看日志文件
SELECT MEMBER FROM v$logfile;
--6、查看表空间的使用情况
SELECT SUM(bytes) / (1024 * 1024) AS free_space, tablespace_name
FROM dba_free_space
GROUP BY tablespace_name;
SELECT a.tablespace_name,
a.bytes total,
b.bytes used,
c.bytes free,
(b.bytes * 100) / a.bytes "% USED ",
(c.bytes * 100) / a.bytes "% FREE "
FROM sys.sm$ts_avail a, sys.sm$ts_used b, sys.sm$ts_free c
WHERE a.tablespace_name = b.tablespace_name
AND a.tablespace_name = c.tablespace_name;
--7、查看数据库库对象
SELECT owner, object_type, status, COUNT(*) count#
FROM all_objects
GROUP BY owner, object_type, status;
--8、查看数据库的版本
SELECT version
FROM product_component_version
WHERE substr(product, 1, 6) = ‘Oracle‘;
--9、查看数据库的创建日期和归档方式
SELECT created, log_mode, log_mode FROM v$database;
--1G=1024MB
--1M=1024KB
--1K=1024Bytes
--1M=11048576Bytes
--1G=1024*11048576Bytes=11313741824Bytes
SELECT a.tablespace_name "表空间名",
total "表空间大小",
free "表空间剩余大小",
(total - free) "表空间使用大小",
total / (1024 * 1024 * 1024) "表空间大小(G)",
free / (1024 * 1024 * 1024) "表空间剩余大小(G)",
(total - free) / (1024 * 1024 * 1024) "表空间使用大小(G)",
round((total - free) / total, 4) * 100 "使用率 %"
FROM (SELECT tablespace_name, SUM(bytes) free
FROM dba_free_space
GROUP BY tablespace_name) a,
(SELECT tablespace_name, SUM(bytes) total
FROM dba_data_files
GROUP BY tablespace_name) b
WHERE a.tablespace_name = b.tablespace_name
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原文地址：http://www.cnblogs.com/huanyou/p/5756404.html
