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Oracle的SQLPLUS常用命令(三)

三、查看数据库的SQL
  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;

Oracle的SQLPLUS常用命令(三)