延时测试（备份库执行）
alter database recover managed standby database delay 120 disconnect from session;
实时同步
ALTER DATABASE RECOVER MANAGED STANDBY DATABASE USING CURRENT LOGFILE DISCONNECT;
alter database recover managed standby database delay 120 disconnect from session;
实时同步
ALTER DATABASE RECOVER MANAGED STANDBY DATABASE USING CURRENT LOGFILE DISCONNECT;
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/30345407/viewspace-2144504/ ，如需转载，请注明出处，否则将追究法律责任。
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