[数据库汇总]-- 查看oracle表空间剩余大小

以下是oracle数据库查看表空间的相关sql：
--1、最常用的举例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 
--2、查看oracle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; 
        
--3、查看oracle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;       
--4、查看oracle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; 


--5、查看oracle表空间的使用情况，这个最靠谱和实用
 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;  
 
注意：只能使用""而不能使用''          
 
--6、查看oracle数据库库对象 
SELECT owner, object_type, status, COUNT(*) count# FROM all_objects  GROUP BY owner, object_type, status; 
 
--7、查看oracle数据库的版本　 
 
SELECT version FROM product_component_version WHERE substr(product, 1, 6) = 'Oracle'; 
 
--8、查看oracle数据库的创建日期和归档方式 
 SELECT created, log_mode FROM v$database;  
--9、查看oracle控制文件目录 
 
 
 
SELECT NAME FROM v$controlfile; 
 
 
--10、查看oracle日志文件目录 
 
SELECT MEMBER FROM v$logfile;