環境：

RAC 2節點：

alert日誌報錯：

RAC1：PING[ARC2]: Heartbeat failed to connect to standby 'DG'. Error is 12541

RAC2：PING[ARC2]: Heartbeat failed to connect to standby 'DG'. Error is 12541

DG：FAL[client, USER]: Error 12543 connecting to RAC for fetching gap sequence

檢視DG監聽有問題：

[oracle@dg ~]$ lsnrctl status

LSNRCTL for Linux: Version 11.2.0.3.0 - Production on 06-DEC-2017 02:00:40

Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=dg)(PORT=1521))
TNS-12541: TNS:no listener
TNS-12560: TNS:protocol adapter error
TNS-00511: No listener
Linux Error: 111: Connection refused

重新註冊監聽：

[oracle@dg ~]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.3.0 Production on Wed Dec 6 02:02:33 2017

Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> select open_mode,database_role from v$database;

OPEN_MODE DATABASE_ROLE
-------------------- ----------------
MOUNTED PHYSICAL STANDBY

[oracle@dg ~]$ lsnrctl start

LSNRCTL for Linux: Version 11.2.0.3.0 - Production on 06-DEC-2017 02:03:42

Starting /u01/app/oracle/product/11.2.0/db_1/bin/tnslsnr: please wait...

TNSLSNR for Linux: Version 11.2.0.3.0 - Production
System parameter file is /u01/app/oracle/product/11.2.0/db_1/network/admin/listener.ora
Log messages written to /u01/app/oracle/diag/tnslsnr/dg/listener/alert/log.xml
Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=dg)(PORT=1521)))

Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=dg)(PORT=1521))
STATUS of the LISTENER
------------------------
Alias                     LISTENER
Version                   TNSLSNR for Linux: Version 11.2.0.3.0 - Production
Start Date                06-DEC-2017 02:03:42
Uptime                    0 days 0 hr. 0 min. 0 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   /u01/app/oracle/product/11.2.0/db_1/network/admin/listener.ora
Listener Log File         /u01/app/oracle/diag/tnslsnr/dg/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=dg)(PORT=1521)))
Services Summary...
Service "DG" has 1 instance(s).
Instance "DG", status UNKNOWN, has 1 handler(s) for this service...
The command completed successfully

[oracle@dg ~]$ lsnrctl status

LSNRCTL for Linux: Version 11.2.0.3.0 - Production on 06-DEC-2017 02:04:05

Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=dg)(PORT=1521))
STATUS of the LISTENER
------------------------
Alias                     LISTENER
Version                   TNSLSNR for Linux: Version 11.2.0.3.0 - Production
Start Date                06-DEC-2017 02:03:42
Uptime                    0 days 0 hr. 0 min. 22 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   /u01/app/oracle/product/11.2.0/db_1/network/admin/listener.ora
Listener Log File         /u01/app/oracle/diag/tnslsnr/dg/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=dg)(PORT=1521)))
Services Summary...
Service "DG" has 2 instance(s).
Instance "DG", status UNKNOWN, has 1 handler(s) for this service...
Instance "DG", status READY, has 1 handler(s) for this service...
The command completed successfully

[oracle@dg ~]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.3.0 Production on Wed Dec 6 02:04:17 2017

Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> alter system register;

System altered.

SQL> exit
Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
[oracle@dg ~]$ lsnrctl status

LSNRCTL for Linux: Version 11.2.0.3.0 - Production on 06-DEC-2017 02:04:39

Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=dg)(PORT=1521))
STATUS of the LISTENER
------------------------
Alias                     LISTENER
Version                   TNSLSNR for Linux: Version 11.2.0.3.0 - Production
Start Date                06-DEC-2017 02:03:42
Uptime                    0 days 0 hr. 0 min. 56 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   /u01/app/oracle/product/11.2.0/db_1/network/admin/listener.ora
Listener Log File         /u01/app/oracle/diag/tnslsnr/dg/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=dg)(PORT=1521)))
Services Summary...
Service "DG" has 2 instance(s).
Instance "DG", status UNKNOWN, has 1 handler(s) for this service...
Instance "DG", status READY, has 1 handler(s) for this service...
The command completed successfully

開啟DG應用同步：

[oracle@dg ~]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.3.0 Production on Wed Dec 6 02:05:05 2017

Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE USING CURRENT LOGFILE DISCONNECT FROM SESSION;
ALTER DATABASE RECOVER MANAGED STANDBY DATABASE USING CURRENT LOGFILE DISCONNECT FROM SESSION
*
ERROR at line 1:
ORA-01153: an incompatible media recovery is active

SQL> shutdown immediate;
ORA-01109: database not open

Database dismounted.
ORACLE instance shut down.

SQL> startup nomount;
ORACLE instance started.

Total System Global Area 1.7103E+10 bytes
Fixed Size                  2245480 bytes
Variable Size            2080378008 bytes
Database Buffers         1.4999E+10 bytes
Redo Buffers               21708800 bytes
SQL> alter database mount;

Database altered.

SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE USING CURRENT LOGFILE DISCONNECT FROM SESSION;

Database altered.

SQL> select thread#, max(sequence#) from v$archived_log where applied='YES' group by thread#;

   THREAD# MAX(SEQUENCE#)
---------- --------------
         1          71127
         2          83492

檢視RAC和DG的MAX(SEQUENCE#)已經同步。

SQL> select RECOVERY_MODE from v$archive_dest_status where rownum<5;

RECOVERY_MODE
-----------------------
MANAGED REAL TIME APPLY
IDLE
IDLE
IDLE

如果要把DG開啟為open狀態執行以下步驟：

SQL> alter database open read only;
alter database open read only
*
ERROR at line 1:
ORA-10456: cannot open standby database; media recovery session may be in
progress

SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE CANCEL;

Database altered.

SQL> alter database open read only;

Database altered.

SQL> select RECOVERY_MODE from v$archive_dest_status where rownum<5;

RECOVERY_MODE
-----------------------
IDLE
IDLE
IDLE
IDLE

SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE USING CURRENT LOGFILE DISCONNECT FROM SESSION;

Database altered.

SQL> select RECOVERY_MODE from v$archive_dest_status where rownum<5;

RECOVERY_MODE
-----------------------
MANAGED REAL TIME APPLY
IDLE
IDLE
IDLE

SQL> select status from v$instance;

STATUS
------------
OPEN

SQL> select thread#, max(sequence#) from v$archived_log where applied='YES' group by thread#;

   THREAD# MAX(SEQUENCE#)
---------- --------------
         1          71129
         2          83494

在RAC節點強制性的進行重做日誌切換檢查RAC和DG是否同步正常：

SQL> alter system switch logfile;

System altered.

測試下來RAC和DG日誌同步正常：

RAC1：

SQL> select thread#, max(sequence#) from v$archived_log where applied='YES' group by thread#;

   THREAD# MAX(SEQUENCE#)
---------- --------------
         1          71129
         2          83495

RAC2：

SQL> select thread#, max(sequence#) from v$archived_log where applied='YES' group by thread#;

   THREAD# MAX(SEQUENCE#)
---------- --------------
         1          71129
         2          83495

DG：

SQL> select thread#, max(sequence#) from v$archived_log where applied='YES' group by thread#;

   THREAD# MAX(SEQUENCE#)
---------- --------------
         1          71129
         2          83495

PING[ARC2]: Heartbeat failed to connect to standby 'DG'. Error is 12541

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