###sample 0
原因未知：
解决办法，重建密码文件
primary db :
alter system set log_archive_dest_state_2=defer sid=‘*‘ scope=both;
standby db
db:
su - db
ALTER DATABASE RECOVER MANAGED STANDBY DATABASE CANCEL;
in primary
mv orapwdb1 orapwdb1.bak
orapwd file=orapwdb1 password=manager entries=100 ignorecase=Y
mv orapwdb2 orapwdb2.bak
orapwd file=orapwdb2 password=manager entries=100 ignorecase=Y
SQL> alter user sys identified by manager;
in standby
mv orapwdb1 orapwdb1.bak
orapwd file=orapwdb1 password=manager entries=100 ignorecase=Y
mv orapwdb2 orapwdb2.bak
orapwd file=orapwdb2 password=manager entries=100 ignorecase=Y
db:
alter database recover managed standby database using current logfile disconnect from session;
primary db :
alter system set log_archive_dest_state_2=ENABLE sid=‘*‘ scope=both;
转 ORA-16191 "Primary log shipping client not logged on standby
原文：https://www.cnblogs.com/feiyun8616/p/10858501.html