Oracle 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;