Oracle中常用数据库基本信息查询语句

--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;