oracle資料字典小結

下面按類别列出一些ORACLE使用者常用資料字典的查詢使用方法。

    一、使用者

    檢視目前使用者的預設表空間

    SQL>select username,default_tablespace from user_users;

    檢視目前使用者的角色

    SQL>select * from user_role_privs;

    檢視目前使用者的系統權限和表級權限

    SQL>select * from user_sys_privs;

    SQL>select * from user_tab_privs;

    二、表

    檢視使用者下所有的表

    SQL>select * from user_tables;

    檢視名稱包含log字元的表

    SQL>select object_name,object_id from user_objects where instr(object_name,'LOG')>0;

    檢視某表的建立時間 

    SQL>select object_name,created from user_objects where object_name=upper('&table_name');

    檢視某表的大小

    SQL>select sum(bytes)/(1024*1024) as size(M) from user_segments where segment_name=upper('&table_name');

    檢視放在ORACLE的記憶體區裡的表  

    SQL>select table_name,cache from user_tables where instr(cache,'Y')>0;

    三、索引

    檢視索引個數和類别

    SQL>select index_name,index_type,table_name from user_indexes order by table_name;  檢視索引被索引的字段

    SQL>select * from user_ind_columns where index_name=upper('&index_name');

    檢視索引的大小

    SQL>select sum(bytes)/(1024*1024) as size(M) from user_segments where segment_name=upper('&index_name');

    四、序列号

    檢視序列号，last_number是目前值

    SQL>select * from user_sequences;

    五、視圖

    檢視視圖的名稱

    SQL>select view_name from user_views;

    檢視建立視圖的select語句

    SQL>select view_name,text_length from user_views;

    SQL>set long 2000;說明：可以根據視圖的text_length值設定set long 的大小

    SQL>select text from user_views where view_name=upper('&view_name');

    六、同義詞

    檢視同義詞的名稱

    SQL>select * from user_synonyms;

    七、限制條件

    檢視某表的限制條件

    SQL>select constraint_name, constraint_type,search_condition, r_constraint_name from user_constraints where table_name = upper('&table_name');

    SQL>select c.constraint_name,c.constraint_type,cc.column_name 

    from user_constraints c,user_cons_columns cc

    where c.owner = upper('&table_owner') and c.table_name = upper('&table_name')

    and c.owner = cc.owner and c.constraint_name = cc.constraint_name

    order by cc.position;       

    八、存儲函數和過程

    檢視函數和過程的狀态

    SQL>select object_name,status from user_objects where object_type='FUNCTION';

    SQL>select object_name,status from user_objects where object_type='PROCEDURE';

    檢視函數和過程的源代碼

    SQL>select text from all_source where owner=user and name=upper('&plsql_name');

    九、觸發器

    檢視觸發器

    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;