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 程式師世界 >> 數據庫知識 >> Oracle數據庫 >> Oracle數據庫基礎 >> Oracle數據字典使用入門

Oracle數據字典使用入門

編輯:Oracle數據庫基礎

下面按類別列出一些Oracle用戶常用數據字典的查詢使用方法。

一、用戶

查看當前用戶的缺省表空間

SQL>SELECT username,default_tablespace FROM user_users;

查看當前用戶的角色

SQL>SELECT * FROM user_role_privs;

查看當前用戶的系統權限和表級權限

SQL>SELECT * FROM user_sys_privs;

SQL>SELECT * FROM user_tab_privs;

二、表

查看用戶下所有的表

SQL>SELECT* FROM user_tables;

查看名稱包含log字符的表

SQL>SELECT object_name,object_id FROM user_objects WHERE INSTR(object_name,'LOG')>0;

查看某表的創建時間

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的內存區裡的表

SQL>SELECT table_name,cache FROM user_tables WHERE INSTR(cache,'Y')>0;

三、索引

查看索引個數和類別

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、序列號

查看序列號,last_number是當前值

SQL>SELECT * FROM user_sequences;

五、視圖

查看視圖的名稱

SQL>SELECT view_name FROM user_vIEws;

查看創建視圖的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

查看同義詞的名稱

SQL>SELECT * FROM user_synonyms;

七、約束條件

查看某表的約束條件

SQL>SELECT constraint_name, constraint_type,search_condition, r_constraint_name
FROM user_constraints WHERE table_name = UPPER('&table_name');
//注意,表名一定是大寫才行
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 6 ORDER BY cc.position;

八、存儲函數和過程

查看函數和過程的狀態

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

查看觸發器

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;
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