下面按類別列出一些ORACLE使用者常用資料字典的查詢使用方法。
一、使用者
查看目前使用者的預設資料表空間
SQL>SELECT username,default_tablespace FROM user_users;
查看目前使用者的角色
SQL>SELECT * FROM user_role_privs;
查看目前使用者的系統許可權和表級許可權
SQL>SELECT * FROM user_sys_privs;
SQL>SELECT * FROM user_tab_privs;
二、表
查看使用者下所有的表
SQL>SELECT* FROM user_tables;
查看名稱包含log字元的表
SQL>SELECT object_name,object_id FROM user_objects WHERE INSTR(object_name,'LOG')>0;
查看某表的建立時間
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的記憶體區裡的表
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;
查看索引被索引的欄位
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、序號
查看序號,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、同義字
查看同義字的名稱
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
2 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
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、儲存函數和過程
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';
查看函數和過程的原始碼
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;
文章出處:http://www.diybl.com/course/7_databases/sql/sqlServer/20081213/153328.html