Oracle DBLINK 抽数以及DDL、DML操作

2021-09-19 21:01:56

DB : 11.2.0.3.0

原库实例orcl：
SQL> select instance_name from v$instance;

INSTANCE_NAME
----------------
orcl

目标库实例yoon：
SQL> select instance_name from v$instance;

INSTANCE_NAME
----------------
yoon

创建表空间
SQL> create tablelspace yoon datafile '/u01/app/oracle/oradata/yoon/yoon01.dbf' size 100m;

创建用户
SQL> create user yoon identified by yoon default tablespace yoon;

授权
SQL> grant dba to yoon;

配置tnsname.ora （一台服务器安装了两个实例,tnsname.ora共用）
[root@db01 admin]# vi tnsnames.ora

# tnsnames.ora Network Configuration File: /u01/app/oracle/product/11.2.0/db_1/network/admin/tnsnames.ora
# Generated by Oracle configuration tools.
ORCL =
(DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = db01)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVICE_NAME = orcl)
      (SERVER = DEDICATED)
    )
)

YOON =
(DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = db01)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVICE_NAME = yoon)
      (SERVER = DEDICATED)
    )
)

原库实例orcl：
SQL> show user
USER is "SYS"

创建DB_LINK（dblink_yoon）：
SQL> create database link dblink_yoon connect to yoon identified by yoon using 'YOON';

Database link created.

dblink_yoon：创建的dblink名
yoon：用户名
yoon：密码
YOON：tnsname.ora中配置的服务名

目标库实例yoon
SQL> conn yoon/yoon
Connected.

SQL> show user
USER is "YOON"

创建测试表：
SQL> create table yoon as select * from scott.emp;

Table created.

SQL> select table_name from user_tables;

TABLE_NAME
------------------------------
YOON

原库实例orcl：
SQL> show user
USER is "SYS"

SQL> select * from yoon.yoon@dblink_yoon;

EMPNO ENAME      JOB              MGR HIREDATE         SAL       COMM     DEPTNO
---------- ---------- --------- ---------- --------- ---------- ---------- ----------
      7369 SMITH      CLERK           7902 17-DEC-80        800                    20
      7499 ALLEN      SALESMAN        7698 20-FEB-81       1600        300         30
      7521 WARD       SALESMAN        7698 22-FEB-81       1250        500         30
      7566 JONES      MANAGER         7839 02-APR-81       2975                    20
      7654 MARTIN     SALESMAN        7698 28-SEP-81       1250       1400         30
      7698 BLAKE      MANAGER         7839 01-MAY-81       2850                    30
      7782 CLARK      MANAGER         7839 09-JUN-81       2450                    10
      7788 SCOTT      ANALYST         7566 19-APR-87       3000                    20
      7839 KING       PRESIDENT            17-NOV-81       5000                    10
      7844 TURNER     SALESMAN        7698 08-SEP-81       1500          0         30
      7876 ADAMS      CLERK           7788 23-MAY-87       1100                    20
      7900 JAMES      CLERK           7698 03-DEC-81        950                    30
      7902 FORD       ANALYST         7566 03-DEC-81       3000                    20
      7934 MILLER     CLERK           7782 23-JAN-82       1300                    10

14 rows selected.

SQL> insert into yoon.yoon@dblink_yoon (empno,ename) values (7777,'KKKK');

1 row created.

SQL> commit;

Commit complete.

SQL> select * from yoon.yoon@dblink_yoon;

15 rows selected.

SQL> update yoon.yoon@dblink_yoon set empno=9999 where empno=7777;

1 row updated.

SQL> commit;

Commit complete.

SQL> select * from yoon.yoon@dblink_yoon;

15 rows selected.

SQL> delete from yoon.yoon@dblink_yoon where yoon.yoon.empno=9999;

1 row deleted.

SQL> commit;

Commit complete.

SQL> select * from yoon.yoon@dblink_yoon;

14 rows selected.

SQL> alter table yoon.yoon@dblink_yoon rename to yoon.yoonbak;
alter table yoon.yoon@dblink_yoon rename to yoon.yoonbak
*
ERROR at line 1:
ORA-02021: DDL operations are not allowed on a remote database

SQL> drop table yoon.yoon@dblink_yoon;
drop table yoon.yoon@dblink_yoon
*
ERROR at line 1:
ORA-02021: DDL operations are not allowed on a remote database

总结：DBLINK支持DML操作、不支持DDL操作(除了写存储过程)

抽数：
1、先创建好表结构

2、通过insert into抽数
SQL> insert /*+APPEND*/ into YOON.YOON_TABLE select /*+ parallel（t 8） */ * from SCOTT.EMP@dblink_yoon t;

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