–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;

1，查询用户表空间名字和大小
select tablespace_name,sum(bytes)/1024/1024 from dba_data_files group by 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;