ORACLE用户常用数据字典

下面按类别列出一些ORACLE用户常用数据字典的查询使用方法。
    
    一、用户

 

    查看当前用户的缺省表空间
    SQL>SELECT username,default_tablespace FROM user_users;

    查看当前用户的角色
    SQL>SELECT * FROM user_role_privs;
 
    查看当前用户的系统权限和表级权限
    SQL>SELECT * FROM user_sys_privs;
    SQL>SELECT * FROM user_tab_privs;

 

    二、表
     
    查看用户下所有的表
    SQL>SELECT* FROM user_tables;
         
    查看名称包含log字符的表
    SQL>SELECT object_name,object_id FROM user_objects WHERE INSTR(object_name,'LOG')>0;
     
    查看某表的创建时间 
    SQL>SELECT object_name,created FROM user_objects WHERE object_name=UPPER('&table_name');
     
    查看某表的大小
    SQL>SELECT SUM(bytes)/(1024*1024) AS size(M) FROM user_segments WHERE segment_name=UPPER('&table_name');
     
    查看放在ORACLE的内存区里的表  
    SQL>SELECT table_name,cache FROM user_tables WHERE INSTR(cache,'Y')>0;
    
    三、索引
    
    查看索引个数和类别
    SQL>SELECT index_name,index_type,table_name FROM user_indexes ORDER BY table_name;
 查看索引被索引的字段
    SQL>SELECT * FROM user_ind_columns WHERE index_name=UPPER('&index_name');
     
    查看索引的大小
    SQL>SELECT SUM(bytes)/(1024*1024) AS size(M) FROM user_segments WHERE segment_name=UPPER('&index_name');
    
    四、序列号
    
    查看序列号，last_number是当前值
    SQL>SELECT * FROM user_sequences;
    
    五、视图
    
    查看视图的名称
    SQL>SELECT view_name FROM user_views;
     
    查看创建视图的select语句
    SQL>SELECT view_name,text_length FROM user_views;
    SQL>SET long 2000;

    //说明：可以根据视图的text_length值设定set long 的大小
    SQL>SELECT text FROM user_views WHERE view_name=UPPER('&view_name');
    
    六、同义词
    
    查看同义词的名称
    SQL>SELECT * FROM user_synonyms;
    
    七、约束条件
    
    查看某表的约束条件
    SQL>SELECT constraint_name, constraint_type,search_condition, r_constraint_name

       2     FROM user_constraints WHERE table_name = UPPER('&table_name');

    //注意，表名一定是大写才行
         
  SQL>SELECT c.constraint_name,c.constraint_type,cc.column_name 

       2   FROM user_constraints c,user_cons_columns cc 

       3   WHERE c.owner = upper('&table_owner')

       4   AND c.table_name = UPPER('&table_name')
       5   AND c.owner = cc.owner and c.constraint_name = cc.constraint_name
       6   ORDER BY cc.position;        
    
    八、存储函数和过程
    
    查看函数和过程的状态
    SQL>SELECT object_name,status FROM user_objects WHERE object_type='FUNCTION';
    SQL>SELECT object_name,status FROM user_objects WHERE object_type='PROCEDURE';
     
    查看函数和过程的源代码
    SQL>SELECT text from all_source WHERE owner=user AND name=UPPER('&plsql_name');
    
    九、触发器
    
    查看触发器

    SET long 50000;
    SET heading off;
    SET pagesize 2000;

 

    SELECT   

    'create or replace trigger ' ||
            trigger_name || '' || chr(10)||
     DECODE( SUBSTR( trigger_type, 1, 1 ),
             'A', 'AFTER', 'B', 'BEFORE', 'I', 'INSTEAD OF' ) ||
                  chr(10) ||
     triggering_event || chr(10) ||
     'ON ' || table_owner || '.' ||
           table_name || '' || chr(10) ||
     DECODE( instr( trigger_type, 'EACH ROW' ), 0, null,
                'FOR EACH ROW' ) || chr(10) ,
     trigger_body
    FROM user_triggers; 

文章出处：http://www.diybl.com/course/7_databases/sql/sqlServer/20081213/153328.html