select * from v_$circuit;查看逻辑回路，共享服务器连接，使用easy connect就会有显示
select * from v_$dispatcher; 一般配置三个
sqlplus 中操作
show parameter dispa
alter system set dispatchers='(PROTOCOL=TCP) (dispatchers=3)'; 这个负责端盘子
alter system set shared_servers=3; 这个负责做菜
show parameter max_dis max_shared这两个也需要配置下
lsnrctl services 就可以认识到
vim tnsnames.ora
SORCL55 =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.55)(PORT = 1522))
)
(CONNECT_DATA =
(SERVER = shared) #共享服务器连接，但是这个很慢
(SERVICE_NAME = orcl.example.com)
)
)
s物理视图连接会话
不让1521不能进行共享服务器连接，其他的可以
vim tnsnames.ora
ONLY1521 =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = station55.example.com)(PORT = 1521))
)
alter system set dispatchers='(PROTOCOL=TCP) (dispatchers=3)(listener=ONLY1521)';
lsnrctl services l2 就没有共享服务器连接了，只有1521端口可以连接
然后进行连接测试,做好tns后会提示12520 TNS error之类4
在win上的实验
cmd
set ORACLE_SID=orcl
conn /as sysdba
show parameter db_name
show parameter service
conn hr/hr
alter user hr identified by hr account unlock;解锁HR用户
select salary from employees where employee_id=100；
接下来做数据库链，先去做tns
vim tnsnames.ora
ORCL244 =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.244)(PORT = 1521))
)
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = orcl.example.com)
)
)
sqlplus /nolog
conn hr/oracle_4U 对等
conn system/oracle_4U 不对等
create database link dblink1 connect to hr identified by hr using 'ORCL244';创建数据库链
select salary from hr.employees@dblink1 where employee_id=100;
update hr.employees@dblink1 set salary=8888 where employee_id=100;
commit;
然后在去windown上看数据是否被改
