oracle表空间相关操作

• oracle存储结构

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; 

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; 

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; 

查看控制文件

    SELECT NAME FROM v$controlfile; 

查看日志文件

    SELECT MEMBER FROM v$logfile; 

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; 

查看数据库库对象

    SELECT owner, object_type, status, COUNT(*) count# 
    FROM all_objects 
    GROUP BY owner, object_type, status; 

查看数据库的版本

    SELECT version 
    FROM product_component_version 
    WHERE substr(product, 1, 6) = 'Oracle'; 

查看数据库的创建日期和归档方式

    SELECT created, log_mode, log_mode FROM v$database; 
    SELECT file_name, tablespace_name, bytes/(1024*1024) M  FROM dba_data_files;

修改表空间数据文件的大小

    ALTER database datafile '/u01/app/oracle/product/10.1/dbs/users01.dbf' RESIZE 32M;

在表空间新增加数据文件

    ALTER TABLESPACE users ADD DATAFILE '/oralcda/u03/app/oracle/oradata/prod/users02.dbf' SIZE 10M;

重新查询

    SELECT file_name, tablespace_name, bytes/(1024*1024) M  FROM dba_data_files;