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;