因主库归档日志未备份直接删除后，从库不能更新，19c版本以上，之前未打补丁，使用
RECOVER STANDBY DATABASE FROM SERVICE PRM180;之后，在执行
alter database recover managed standby database using current logfile disconnect from session;
alter database recover managed standby database cancel;
alter database open;
打不开提示
SQL> alter database open;
alter database open
*
ERROR at line 1:
ORA-10458: standby database requires recovery
ORA-01152: file 1 was not restored from a sufficiently old backup
ORA-01110: data file 1: '/u02/oradata/system01.dbf'
后来打了19c的最新的补丁，
rman target /
RMAN> RECOVER STANDBY DATABASE FROM SERVICE PRM180;
之后，直接在在sql命令中输入：
alter database open；打开正常
SQL> alter database open;Database altered.参考：用一条命令将RMAN增量备份前滚到物理备库 (文档 ID 2504977.1)
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