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标题: Failover Connections for Data Guard Error with ORA-1033 [打印本页]

作者: 刘泽宇 时间: 2021-1-31 11:30
标题: Failover Connections for Data Guard Error with ORA-1033
本帖最后由刘泽宇于 2021-1-31 11:34 编辑

Connections in data guard environment fail with ORA-01033: ORACLE initialization or shutdown in progress.（参照文档 ID:461874.1）

现象：

Connections in data guard environment fail with ORA-01033: ORACLE initialization or shutdown in progress.

Oracle Net client trace shows after successful connection handshake

[27-SEP-2007 11:34:18:104] nsprecv: 00 00 39 4F 52 41 2D 30 |..9ORA-0|

[27-SEP-2007 11:34:18:104] nsprecv: 31 30 33 33 3A 20 4F 52 |1033:.OR|

[27-SEP-2007 11:34:18:104] nsprecv: 41 43 4C 45 20 69 6E 69 |ACLE.ini|

[27-SEP-2007 11:34:18:104] nsprecv: 74 69 61 6C 69 7A 61 74 |tializat|

[27-SEP-2007 11:34:18:104] nsprecv: 69 6F 6E 20 6F 72 20 73 |ion.or.s|

[27-SEP-2007 11:34:18:104] nsprecv: 68 75 74 64 6F 77 6E 20 |hutdown.|

[27-SEP-2007 11:34:18:104] nsprecv: 69 6E 20 70 72 6F 67 72 |in.progr|

[27-SEP-2007 11:34:18:104] nsprecv: 65 73 73 0A |ess. |

Net service name has LOAD_BALANCE set in description section

(DESCRIPTION =

(LOAD_BALANCE = yes)

(ADDRESS = (PROTOCOL = TCP)(HOST = <NodeA>)(PORT = 1521))

(ADDRESS = (PROTOCOL = TCP)(HOST = <NodeB>)(PORT = 1521))

)

Or has two description sections

(DESCRIPTION_LIST =

(DESCRIPTION =

(ADDRESS = (PROTOCOL = TCP)(Host = <NodeA>)(Port = 1521))

(CONNECT_DATA =

(SERVICE_NAME = <service_name1>)

)

(DESCRIPTION =

(ADDRESS = (PROTOCOL = TCP)(Host = <NodeB>)(Port = 1521))

(CONNECT_DATA =

(SERVICE_NAME = <service_name2>)

)

原因：

Error ORA-1033 is expected for connections when they attempt to connect to standby instance, because it is mounted and not open.

When LOAD_BALANCE is set, connections can load balance between the addresses in the net service name.

When there are two description sections in a net service name, Oracle Net will load balance between them (Load Balancing is on by default).

处理方法：

Example is for service called failover

1. Setup the net service name, ensuring LOAD_BALANCE is not used and one has one description section.

failover_test =
  (DESCRIPTION =
(ADDRESS_LIST =
   (ADDRESS = (PROTOCOL = TCP)(HOST = <NodeA>)(PORT = 1521))
   (ADDRESS = (PROTOCOL = TCP)(HOST = <NodeB>)(PORT = 1521))
)
(CONNECT_DATA =
   (SERVICE_NAME = failover)
   (SERVER = DEDICATED)
      (FAILOVER_MODE =
      (TYPE = session)
      (METHOD = BASIC)
      (RETRIES = 180)
      (DELAY = 5)
      )
   )
)
2. Create and start service

SQL> exec DBMS_SERVICE.CREATE_SERVICE (service_name => 'failover',network_name => 'failover',aq_ha_notifications => true,failover_method => 'BASIC', failover_type => 'SELECT',failover_retries => 180,failover_delay => 1);

PL/SQL procedure successfully completed.

SQL>exec dbms_service.start_service('failover');

PL/SQL procedure successfully completed.

3.Create a database trigger to ensure the service name is always the same, no matter which node's instance is the primary.

sqlplus / as sysdba

SQL> CREATE OR REPLACE TRIGGER manage_OCIservice
after startup on database
DECLARE
role VARCHAR(30);
BEGIN
SELECT DATABASE_ROLE INTO role FROM V$DATABASE;
IF role = 'PRIMARY' THEN
DBMS_SERVICE.START_SERVICE('failover');
ELSE
DBMS_SERVICE.STOP_SERVICE('failover');
END IF;
END;

PL/SQL procedure successfully completed.

4. Ensure the change is made on the standby with command.

SQL> Alter system archive log current ;

5. Listener service command lsnrctl services on primary will then show

Service "failover" has 1 instance(s).
  Instance "<instance1>", status READY, has 1 handler(s) for this service...
Handler(s):
   "DEDICATED" established:0 refused:0 state:ready
      LOCAL SERVER

This method ensures the service failover is only available on the primary node.The net service name "failover_test" works through the addresses in the address_list section, in order. If <NodeA> is the standby, then <NodeB> will have the service failover and the connection will attempt to connect.

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