author:skate
time:2009/04/14
配置共享模式:
找到初始化文件pfile,然后对其编辑或加入如下内容:
max_shared_servers =39 #数据库支持的最大的服务进程数
shared_servers =3 #一般应该是数据库连接数的十分之一
max_dispatchers=19 #调度进程的最大数量 = 数据库最大session数 /每个调度器服务的session数;
dispatchers ="(PROTOCOL=TCP)(SERVICE=orclXDB)(list=orcl)(con=30)(dispa=5)(sess=200)"
保存退出,reboot数据库,然后生成spfile
create spfile from pfile;
查看共享服务器配置是否正确:
SQL> show parameter shared
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
hi_shared_memory_address integer 0
max_shared_servers integer 39
shared_memory_address integer 0
shared_pool_reserved_size big integer 5872025
shared_pool_size big integer 117440512
shared_server_sessions integer 330
shared_servers integer 3
SQL>
SQL> show parameter dispa
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
dispatchers string (PROTOCOL=TCP)(SERVICE=orclXDB
)(list=orcl)
max_dispatchers integer 19
mts_dispatchers string (PROTOCOL=TCP)(SERVICE=orclXDB
)(list=orcl)
mts_max_dispatchers integer 19
SQL>
然后再客户端配置tnnames.ora
245 =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.2.245)(PORT = 1521))
)
(CONNECT_DATA =
(SERVER = SHARED)
(SERVICE_NAME = orcl)
)
)
然后用客户端连接数据库,总是报:
ora-12523 tns 监听程序未找到适用于客户机连接的例程
然后修改客户端配置tnnames.ora如下所示:
245 =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.2.245)(PORT = 1521))
)
(CONNECT_DATA =
(SERVER = SHARED)
(SID=ORCL)
)
)
在连接 ,就ok了
如果遇到报错 ora-12520: tns 监听程序无法找到需要的服务器类型的可用句柄
那说明你的共享服务器配置错误,你的服务器还是专有服务器模式,而你的客户端正
视图用共享连接你的数据库(server=shared),解决方法是:
1.更改客户端的tnsnames.ora为专有模式(server=dedicated)
2.把服务器配置成共享模式数据库
如要把数据库配置成专有模式,要让如下参数都等于0
shared_servers=0
但我改完之后还可以用共享模式连接,只要我的客户端tnsnames配置如下:
245 =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.2.245)(PORT = 1521))
)
(CONNECT_DATA =
(SERVER = SHARED)
(SID=ORCL)
)
)
但是如果客户端的tnsnames如果改为
245 =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.2.245)(PORT = 1521))
)
(CONNECT_DATA =
(SERVER = SHARED)
(SERVICE_NAME = orcl)
)
)
就只能以专有模式连接
在改为专有模式时,很可能遇到ORA-12519错误。这个错误是因为客户端指定的SID
与dedicated server handler匹配不上,这就需要用LOCAL_LISTENER参数来指定服务名
服务器的tnsname文件如下:
ORCL =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.2.245)(PORT = 1521))
)
(CONNECT_DATA =
(SERVER = DEDICATED)
(SID = ORCL)
)
)
那么就需要执行
SQL> alter system set local_listener='orcl' scope=both;
System altered.
现在你的客户端又可以正常连接了,以DEDICATED SERVER模式
注意:如果dispatchers中指定service, 那么在客户端默认连接是dedicate连接,
如果不指定service,则是是shared server
alter system set dispatchers='(PROTOCOL=TCP) (SERVICE=orclXDB)';
查看你的服务器目前的连接是否是共享连接
select * from v$dispatcher
select * from v$shared_server
select * from v$shared_server_monitor
select count(*) from v$dispatcher;
select * from v$circuit
查看注册的服务
lsnrctl services listener
参考文档:
http://blog.csdn.net/wyzxg/archive/2009/04/14/4073833.aspx
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