1，Oracle表空間物理存放檔案位置

       用SYS登陸SQLPLUS，select t1.name,t2.name from v$tablespace t1,v$datafile t2  where t1.ts# = t2.ts#;

1、查看錶空間的名稱及大小   
SQl > 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、查看錶空間物理檔案的名稱及大小   
SQl > SELECT tablespace_name, file_id, file_name, round(bytes / (1024 * 1024), 0) total_space FROM dba_data_files ORDER BY tablespace_name;   
 
3、查看回滾段名稱及大小   
SQl > 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、檢視控制檔案   
SQl > SELECT NAME FROM v$controlfile;   
 
5、檢視日誌檔案   
SELECT MEMBER FROM v$logfile;   
 
6、查看錶空間的使用情況   
SQl > SELECT SUM(bytes) / (1024 * 1024) AS free_space, tablespace_name  FROM dba_free_space GROUP BY tablespace_name;   
 
SQl > 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、檢視資料庫庫物件   
SQl > SELECT owner, object_type, status, COUNT(*) count# FROM all_objects GROUP BY owner, object_type, status;   
 
8、檢視資料庫的版本　   
SQl > SELECT version FROM product_component_version WHERE substr(product, 1, 6) = 'Oracle';   
 
9、檢視資料庫的建立日期和歸檔方式   
SQl > SELECT created, log_mode, log_mode FROM v$database;