oracle的负载均衡没起作用可能和你的remote_listener 未配置有关

rac1:rac的cluster的负载均衡机制如下图

分两层

ocssd.bin负责底层，db层

链接到来先根据ocssd搜集的pmon的信息，决定，如果忙，则转到其他节点，pmon根据remote_listener 来看都有哪些节点的监听，人乎负载均衡给其他rac

服务器端配置参考：

remote_listener string LISTENERS_RACDB

LISTENERS_RACDB =
  (ADDRESS_LIST =
    (ADDRESS = (PROTOCOL = TCP)(HOST = rac1-vip)(PORT = 1521))
    (ADDRESS = (PROTOCOL = TCP)(HOST = rac2-vip)(PORT = 1521))
  )

经验证动态取掉remote_listener

节点会在连接的时候随机根据实例中的节点列表确定连接节点

如果设置load_balance=NO 则只会连接tnsname排在第一个的那个rac节点，但是出现故障后，failover还是会生效

高可用状态

lsnrctl status的配置remote参数前后变化

lsnrctl stat中取掉remote_listener 的监听状态前后变化：

[oracl[email protected] bin]$ lsnrctl stat

LSNRCTL for Linux: Version 10.2.0.1.0 - Production on 17-AUG-2018 13:51:00

Copyright (c) 1991, 2005, Oracle.  All rights reserved.

Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521))
STATUS of the LISTENER
------------------------
Alias                     LISTENER_RAC1
Version                   TNSLSNR for Linux: Version 10.2.0.1.0 - Production
Start Date                17-AUG-2018 13:18:52
Uptime                    0 days 0 hr. 32 min. 8 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   /opt/ora10g/product/10.2.0/data/network/admin/listener.ora
Listener Log File         /opt/ora10g/product/10.2.0/data/network/log/listener_rac1.log
Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.110.70)(PORT=1521)))
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.110.60)(PORT=1521)))
  (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC)))
Services Summary...
Service "+ASM" has 1 instance(s).
  Instance "+ASM1", status BLOCKED, has 1 handler(s) for this service...
Service "+ASM_XPT" has 1 instance(s).
  Instance "+ASM1", status BLOCKED, has 1 handler(s) for this service...
Service "racdb" has 1 instance(s).
  Instance "racdb1", status READY, has 1 handler(s) for this service...
Service "racdb_XPT" has 1 instance(s).
  Instance "racdb1", status READY, has 1 handler(s) for this service...
The command completed successfully

Services Summary...
Service "+ASM" has 1 instance(s).
  Instance "+ASM1", status BLOCKED, has 1 handler(s) for this service...
Service "+ASM_XPT" has 1 instance(s).
  Instance "+ASM1", status BLOCKED, has 1 handler(s) for this service...
Service "hr" has 1 instance(s).
  Instance "racdb2", status READY, has 1 handler(s) for this service...
Service "racdb" has 2 instance(s).
  Instance "racdb1", status READY, has 2 handler(s) for this service...
  Instance "racdb2", status READY, has 1 handler(s) for this service...
Service "racdb_XPT" has 2 instance(s).
  Instance "racdb1", status READY, has 2 handler(s) for this service...
  Instance "racdb2", status READY, has 1 handler(s) for this service...

oracle的负载均衡没起作用可能和你的remote_listener 未配置有关

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