Oracle 12c 在生产库停止Data Guard怎么搞？

在生产库停止DataGuard操作如下。

SQL> show parameter log_archive_dest_2

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
log_archive_dest_2 string service="orcldg", SYNC AFFIRM
delay=0 optional compression=d
isable max_failure=0 max_conne
ctions=1 reopen=300 db_unique_
name="orcldg" net_timeout=10,
valid_for=(online_logfile,all_
roles)
log_archive_dest_20 string
log_archive_dest_21 string
log_archive_dest_22 string
log_archive_dest_23 string

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
log_archive_dest_24 string
log_archive_dest_25 string
log_archive_dest_26 string
log_archive_dest_27 string
log_archive_dest_28 string
log_archive_dest_29 string
SQL> show parameter log_archive_dest_state_2

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
log_archive_dest_state_2 string ENABLE
log_archive_dest_state_20 string enable
log_archive_dest_state_21 string enable
log_archive_dest_state_22 string enable
log_archive_dest_state_23 string enable
log_archive_dest_state_24 string enable
log_archive_dest_state_25 string enable
log_archive_dest_state_26 string enable
log_archive_dest_state_27 string enable
log_archive_dest_state_28 string enable
log_archive_dest_state_29 string enable

以下三种方式效果是一样的。
SQL> alter system set log_archive_dest_state_2=defer;
System altered.

SQL> alter system set log_archive_dest_state_2=defer scope=both;
System altered.

SQL> alter system set log_archive_dest_state_2=defer scope=both sid='*';
System altered.

发现有报错了。
DGMGRL> show configuration;

Configuration - dg_config

Protection Mode: MaxAvailability
Members:
orcl - Primary database
Error: ORA-16810: multiple errors or warnings detected for the database

orcldg - Physical standby database
Warning: ORA-16857: standby disconnected from redo source for longer than specified threshold

Fast-Start Failover: DISABLED

Configuration Status:
ERROR (status updated 45 seconds ago)

DGMGRL>

在生产库启动DataGuard如下：

重新修改数据库参数为enable
SQL> alter system set log_archive_dest_state_2=enable;

System altered.

状态正常了。
DGMGRL> show configuration;

Configuration - dg_config

Protection Mode: MaxAvailability
Members:
orcl - Primary database
orcldg - Physical standby database

Fast-Start Failover: DISABLED

Configuration Status:
SUCCESS (status updated 7 seconds ago)

日常运维工作，这些过程要熟悉，熟练，懂原理，多动手。每天进步一点点。