创建dblink：

create database link [name]
  connect to [username] IDENTIFIED BY [password]
  using '(DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = [ip])(PORT = [port]))
    )
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = xxx)
    )
  )';

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删除dblink：

DROP DATABASE LINK [name];
--或
DROP PUBLIC DATABASE LINK [name];

?今天在试着删除的时候报错：

ORA-02018：database link of same name has an open connection

?

关闭dblink：

ALTER SESSION CLOSE DATABASE LINK [name];

?但是报错：

ORA-02080: database link is in use

去v$dblink查看

SELECT * FROM v$dblink;

?该dblink确实没有在transaction，很疑惑。搜一下没找到解决办法，然后把plsql关了，过一会再开，执行ALTER SESSION的时候，报错：

?ORA-02080: database link is not open

我知道这时应该可以删除了，?然后再DROP，可以了。

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