adg启动快照功能

开启快照功能，一般用于测试库，可以定期与生产库同步更新数据库，更新后开启快照读写模式。

SQL> select open_mode,database_role from v$database;

OPEN_MODE         DATABASE_ROLE
-------------------- ----------------
READ ONLY WITH APPLY PHYSICAL STANDBY

SQL>  shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup mount;
ORACLE instance started.

Total System Global Area 9.1930E+10 bytes
Fixed Size            2305024 bytes
Variable Size         1.3220E+10 bytes
Database Buffers     7.8652E+10 bytes
Redo Buffers           55205888 bytes
Database mounted.
SQL> alter database convert to snapshot standby;
alter database convert to snapshot standby
*
ERROR at line 1:
ORA-38784: Cannot create restore point 'SNAPSHOT_STANDBY_REQUIRED_10/30/2019 10:08:20'.
ORA-38786: Recovery area is not enabled.


SQL> show parameter recover

NAME                     TYPE                  VALUE
------------------------------------ -------------------------------- ------------------------------
db_recovery_file_dest             string
db_recovery_file_dest_size         big integer              0
db_unrecoverable_scn_tracking         boolean                  TRUE
recovery_parallelism             integer                  0
SQL> archive log list;
Database log mode           Archive Mode
Automatic archival           Enabled
Archive destination           +HMOLD/sthuibuy/arch
Oldest online log sequence     11354
Next log sequence to archive   0
Current log sequence           11359
SQL> alter system set db_recovery_file_dest_size=300G;

System altered.


SQL>  alter system set db_recovery_file_dest='+HMOLD';

System altered.

SQL> 
SQL> alter database convert to snapshot standby;

Database altered.

SQL> alter database open;

Database altered.

SQL> select open_mode,database_role from v$database;

OPEN_MODE         DATABASE_ROLE
-------------------- ----------------
READ WRITE         SNAPSHOT STANDBY

SQL> select name,storage_size from v$restore_point;

NAME                                                                 STORAGE_SIZE
-------------------------------------------------------------------------------------------------------------------------------- ------------
SNAPSHOT_STANDBY_REQUIRED_10/30/2019 10:11:57                                               1757028352




NAME                 VALUE
-------------------------------- ----------------------------------------------------------------
apply lag             +01 23:23:07
apply finish time         +00 00:19:11.320

hmptcx1[/home/oracle]$sqlplus / as sysdba

SQL*Plus: Release 11.2.0.4.0 Production on Fri Nov 1 09:30:52 2019

Copyright (c) 1982, 2013, Oracle.  All rights reserved.


Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP,
Data Mining and Real Application Testing options

SQL>  select open_mode,database_role from v$database;

OPEN_MODE         DATABASE_ROLE
-------------------- ----------------
READ WRITE         SNAPSHOT STANDBY

SQL> 
SQL> 
SQL>  shutdown immediate;
Database closed.
Database dismounted.
startup mount;
ORACLE instance shut down.
SQL> 
ORACLE instance started.

Total System Global Area 9.1930E+10 bytes
Fixed Size            2305024 bytes
Variable Size         1.3220E+10 bytes
Database Buffers     7.8652E+10 bytes
Redo Buffers           55205888 bytes
Database mounted.
SQL> SQL> alter database convert to physical standby;

Database altered.

SQL> shutdown immediate;
ORA-01507: database not mounted


ORACLE instance shut down.
SQL> startup
ORACLE instance started.

Total System Global Area 9.1930E+10 bytes
Fixed Size            2305024 bytes
Variable Size         1.3220E+10 bytes
Database Buffers     7.8652E+10 bytes
Redo Buffers           55205888 bytes
Database mounted.
Database opened.
SQL> alter database recover managed standby database using current logfile disconnect from session;

Database altered.