ORACLE 19.3 (DG snapshot standby)

1. 备库 (物理备用数据库到快照备用数据库)

[oracle@XAG192 ~]$ sqlplus / as sysdba

SQL> select database_role,protection_mode,open_mode, switchover_status from v$database;
DATABASE_ROLE    PROTECTION_MODE      OPEN_MODE        SWITCHOVER_STATUS
---------------- -------------------- -------------------- --------------------
PHYSICAL STANDBY MAXIMUM PERFORMANCE  READ ONLY WITH APPLY NOT ALLOWED


SQL> shutdown immediate;
SQL> startup mount;

#转换物理standby到快照standby
SQL> alter database convert to snapshot standby;

SQL> alter database open;

SQL> select database_role,protection_mode,open_mode, switchover_status from v$database;
DATABASE_ROLE    PROTECTION_MODE      OPEN_MODE        SWITCHOVER_STATUS
---------------- -------------------- -------------------- --------------------
SNAPSHOT STANDBY MAXIMUM PERFORMANCE  READ WRITE       NOT ALLOWED

SQL> select name from v$restore_point;

NAME                                            STORAGE_SIZE
----------------------------------------------------------------
SNAPSHOT_STANDBY_REQUIRED_06/16/2019 18:50:44   209715200
GUAR_RESTORE_01_PRIMARY                            0

SQL> insert into test_190616 values(sysdate);
SQL> commit;     --测试是否可以修改数据库 OK

2. 备库(快照备用数据库到物理备用数据库)

[oracle@XAG192 ~]$ sqlplus / as sysdba

SQL> select database_role,protection_mode,open_mode, switchover_status from v$database;
DATABASE_ROLE    PROTECTION_MODE      OPEN_MODE        SWITCHOVER_STATUS
---------------- -------------------- -------------------- --------------------
SNAPSHOT STANDBY MAXIMUM PERFORMANCE  READ WRITE       NOT ALLOWED


SQL> shutdown immediate;
SQL> startup mount;

#转换快照standby 到 物理standby
SQL> alter database convert to physical standby;

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

SQL> startup

SQL> alter database recover managed standby database using current logfile disconnect from session;

SQL> select database_role,protection_mode,open_mode, switchover_status from v$database;
DATABASE_ROLE    PROTECTION_MODE      OPEN_MODE        SWITCHOVER_STATUS
---------------- -------------------- -------------------- --------------------
PHYSICAL STANDBY MAXIMUM PERFORMANCE  READ ONLY WITH APPLY NOT ALLOWED