The following statement defines a fixed-user database link named sales.hq.acme.com: CREATE DATABASE LINK sales.hq.acme.com CONNECT TO hr IDENTIFIED BY hr USING 'sales';
Examples CURRENT_USER Example The following statement defines a current-user database link using the demo database: CREATE DATABASE LINK sales.hq.acme.com CONNECT TO CURRENT_USER USING 'sales';Fixed User Example The following statement defines a fixed-user database link named sales.hq.acme.com: CREATE DATABASE LINK sales.hq.acme.com CONNECT TO hr IDENTIFIED BY hr USING 'sales'; Once this database link is created, you can query tables in the schema scott on the remote database in this manner: SELECT * FROM [email protected]; You can also use DML statements to modify data on the remote database: INSERT INTO [email protected] (customer_id, order_id, order_total) VALUES (5001, 1235, 2000);UPDATE [email protected] SET order_total = order_total + 500;DELETE FROM [email protected] WHERE order_id = 2443; You can also access tables owned by other users on the same database. This statement assumes that the current user has SELECT privileges on the hr.departments table: SELECT * FROM [email protected]; The previous statement connects to the user scott on the remote database and then queries Adam's dept table. You can create a synonym to hide the fact that the departments table is on a remote database. The following statement causes all future references to dept to access a remote departments table owned by hr: CREATE SYNONYM dept FOR [email protected];PUBLIC Database Link Example The following statement defines a shared public fixed user database link named sales.hq.acme.com that refers to user scott with password tiger on the database specified by the string service name 'sales': CREATE SHARED PUBLIC DATABASE LINK sales.hq.acme.com CONNECT TO hr IDENTIFIED BY hr AUTHENTICATED BY anupam IDENTIFIED BY bhide USING 'sales';
建DB_Link很簡單基本語法如下﹕ CREATE DATABASE LINK db_link_name CONNECT TO usename IDENTIFIED BY password USING 'other_database_name';(你所要連的那個數據庫的別名) 但在建的過程中必須注意几點﹕ 首先﹐配置要連的那台服務器的本機服務 其次﹐看INIT文件中的global_names參數的值﹐如果其值為false 則other_database_name用你本機配置的別名﹐如果其值為true則other_database_name用其database在創建時所用的全局名稱。一般我們都把global_names修改為false.
CONNECT TO hr IDENTIFIED BY hr
USING 'sales';
你给的链接进不去，要用户名和密码，能不能给我考过来，多谢啦！！
CURRENT_USER Example
The following statement defines a current-user database link using the demo database: CREATE DATABASE LINK sales.hq.acme.com
CONNECT TO CURRENT_USER
USING 'sales';Fixed User Example
The following statement defines a fixed-user database link named sales.hq.acme.com: CREATE DATABASE LINK sales.hq.acme.com
CONNECT TO hr IDENTIFIED BY hr
USING 'sales';
Once this database link is created, you can query tables in the schema scott on the remote database in this manner: SELECT * FROM [email protected];
You can also use DML statements to modify data on the remote database: INSERT INTO [email protected]
(customer_id, order_id, order_total)
VALUES (5001, 1235, 2000);UPDATE [email protected]
SET order_total = order_total + 500;DELETE FROM [email protected]
WHERE order_id = 2443;
You can also access tables owned by other users on the same database. This statement assumes that the current user has SELECT privileges on the hr.departments table: SELECT *
FROM [email protected];
The previous statement connects to the user scott on the remote database and then queries Adam's dept table. You can create a synonym to hide the fact that the departments table is on a remote database. The following statement causes all future references to dept to access a remote departments table owned by hr: CREATE SYNONYM dept
FOR [email protected];PUBLIC Database Link Example
The following statement defines a shared public fixed user database link named sales.hq.acme.com that refers to user scott with password tiger on the database specified by the string service name 'sales': CREATE SHARED PUBLIC DATABASE LINK sales.hq.acme.com
CONNECT TO hr IDENTIFIED BY hr
AUTHENTICATED BY anupam IDENTIFIED BY bhide
USING 'sales';
CREATE DATABASE LINK db_link_name
CONNECT TO usename IDENTIFIED BY password
USING 'other_database_name';(你所要連的那個數據庫的別名)
但在建的過程中必須注意几點﹕
首先﹐配置要連的那台服務器的本機服務
其次﹐看INIT文件中的global_names參數的值﹐如果其值為false 則other_database_name用你本機配置的別名﹐如果其值為true則other_database_name用其database在創建時所用的全局名稱。一般我們都把global_names修改為false.