###################
SQL*Plus: Release 19.0.0.0.0 - Production on Tue Sep 29 10:47:09 2020
Version 19.7.0.0.0
创建新的服务
[oracle@rac1:/home/oracle]$ srvctl add service -d tbcsa -s tbcsa2_1 -r tbcsa2 -a tbcsa1
[oracle@rac1:/home/oracle]$ srvctl start service -d tbcsa -s tbcsa2_1
[oracle@rac1:/home/oracle]$ srvctl modify service -d tbcsa -s tbcsa2_1 -e SESSION -m BASIC -w 10 -z 3
[oracle@rac1:/home/oracle]$ srvctl modify service -d tbcsa -s tbcsa2_1 -failback YES
srvctl relocate service -db tbcsa -service tbcsa2_1 -newinst tbcsa2 -oldinst tbcsa1
节点2测试连接
-----------session 1
[oracle@rac2:/home/oracle]$ sqlplus c##dbmt/dba_123@192.168.220.173:1521/tbcsa2_1
SQL*Plus: Release 19.0.0.0.0 - Production on Tue Sep 29 10:47:09 2020
Version 19.7.0.0.0
Copyright (c) 1982, 2020, Oracle. All rights reserved.
Last Successful login time: Tue Sep 29 2020 10:45:14 +08:00
Connected to:
Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production
Version 19.7.0.0.0
SQL> select instance_name from v$instance;
INSTANCE_NAME
----------------
tbcsa2
-------------节点2监听状态 服务tbcsa2_1在节点2
[oracle@rac2:/home/oracle]$ lsnrctl status
LSNRCTL for Linux: Version 19.0.0.0.0 - Production on 29-SEP-2020 10:47:02
Copyright (c) 1991, 2019, Oracle. All rights reserved.
Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521))
STATUS of the LISTENER
------------------------
Alias LISTENER
Version TNSLSNR for Linux: Version 19.0.0.0.0 - Production
Start Date 29-SEP-2020 10:22:24
Uptime 0 days 0 hr. 24 min. 37 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /oracle/app/19.0.0/grid/network/admin/listener.ora
Listener Log File /oracle/app/grid/diag/tnslsnr/rac2/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=LISTENER)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.220.72)(PORT=1521)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.220.172)(PORT=1521)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcps)(HOST=rac2)(PORT=5500))(Security=(my_wallet_directory=/oracle/app/oracle/product/19.0.0/db_1/admin/tbcsa/xdb_wallet))(Presentation=HTTP)(Session=RAW))
Services Summary...
Service "+ASM" has 1 instance(s).
Instance "+ASM2", status READY, has 1 handler(s) for this service...
Service "+ASM_CRSDG" has 1 instance(s).
Instance "+ASM2", status READY, has 1 handler(s) for this service...
Service "+ASM_DATADG" has 1 instance(s).
Instance "+ASM2", status READY, has 1 handler(s) for this service...
Service "86b637b62fdf7a65e053f706e80a27ca" has 1 instance(s).
Instance "tbcsa2", status READY, has 1 handler(s) for this service...
Service "a59ce61dd45c3171e05347dca8c05c05" has 1 instance(s).
Instance "tbcsa2", status READY, has 1 handler(s) for this service...
Service "pdb" has 1 instance(s).
Instance "tbcsa2", status READY, has 1 handler(s) for this service...
Service "tbcsa" has 1 instance(s).
Instance "tbcsa2", status READY, has 1 handler(s) for this service...
Service "tbcsa2_1" has 1 instance(s).
Instance "tbcsa2", status READY, has 1 handler(s) for this service...
Service "tbcsaXDB" has 1 instance(s).
Instance "tbcsa2", status READY, has 1 handler(s) for this service...
The command completed successfully
-------kill节点2实例
[oracle@rac2:/home/oracle]$ ps -ef | grep pmon
grid 5830 1 0 10:22 ? 00:00:00 asm_pmon_+ASM2
oracle 16029 1 0 10:45 ? 00:00:00 ora_pmon_tbcsa2
oracle 16711 9619 0 10:47 pts/0 00:00:00 grep --color=auto pmon
[oracle@rac2:/home/oracle]$ kill -9 16029
---服务自动relocate到节点1，此时session1不敲回车，（如果此时session1敲回车，则该会话会连接至节点1，待crs拉起节点2实例后服务会重新回到2节点，但该session不会重连至节点2，而是保持长连接在节点1）
[oracle@rac1:/home/oracle]$ lsnrctl status
LSNRCTL for Linux: Version 19.0.0.0.0 - Production on 29-SEP-2020 10:36:17
Copyright (c) 1991, 2019, Oracle. All rights reserved.
Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521))
STATUS of the LISTENER
------------------------
Alias LISTENER
Version TNSLSNR for Linux: Version 19.0.0.0.0 - Production
Start Date 29-SEP-2020 10:21:46
Uptime 0 days 0 hr. 14 min. 30 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /oracle/app/19.0.0/grid/network/admin/listener.ora
Listener Log File /oracle/app/grid/diag/tnslsnr/rac1/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=LISTENER)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.220.71)(PORT=1521)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.220.171)(PORT=1521)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcps)(HOST=rac1)(PORT=5500))(Security=(my_wallet_directory=/oracle/app/oracle/product/19.0.0/db_1/admin/tbcsa/xdb_wallet))(Presentation=HTTP)(Session=RAW))
Services Summary...
Service "+ASM" has 1 instance(s).
Instance "+ASM1", status READY, has 1 handler(s) for this service...
Service "+ASM_CRSDG" has 1 instance(s).
Instance "+ASM1", status READY, has 1 handler(s) for this service...
Service "+ASM_DATADG" has 1 instance(s).
Instance "+ASM1", status READY, has 1 handler(s) for this service...
Service "86b637b62fdf7a65e053f706e80a27ca" has 1 instance(s).
Instance "tbcsa1", status READY, has 1 handler(s) for this service...
Service "a59ce61dd45c3171e05347dca8c05c05" has 1 instance(s).
Instance "tbcsa1", status READY, has 1 handler(s) for this service...
Service "pdb" has 1 instance(s).
Instance "tbcsa1", status READY, has 1 handler(s) for this service...
Service "tbcsa" has 1 instance(s).
Instance "tbcsa1", status READY, has 1 handler(s) for this service...
Service "tbcsa2_1" has 1 instance(s).
Instance "tbcsa1", status READY, has 1 handler(s) for this service...
Service "tbcsaXDB" has 1 instance(s).
Instance "tbcsa1", status READY, has 1 handler(s) for this service...
The command completed successfully
-----节点2集群自动拉起实例 session1敲回车，可以看到服务切换回节点2且重连至2实例
Connected to:
Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production
Version 19.7.0.0.0
SQL> select instance_name from v$instance;
INSTANCE_NAME
----------------
tbcsa2
SQL> select instance_name from v$instance;
select instance_name from v$instance
*
ERROR at line 1:
ORA-25408: can not safely replay call
SQL> select instance_name from v$instance;
INSTANCE_NAME
----------------
tbcsa2
总结：1.服务设置了TFA BASIC和failback后实例异常宕，该服务会自动relocate到另一个节点上
2.如果在节点宕之前session通过该服务连接至2实例，2节点宕之后，如果敲回车则该session会随服务转移到节点1并成为长连接，且不会在节点2 重启后重连至节点2。
3.如果在节点宕之前session通过该服务连接至2实例，2节点宕之后，如果不敲回车则该session不会立即连接到节点1，节点2重启后敲回车会重连至节点2。