gap报错日志：
Completed: ALTER DATABASE RECOVER MANAGED STANDBY DATABASE DISCONNECT FROM SESSION
Tue Jan 18 10:24:45 2022
FAL[client]: Failed to request gap sequence
GAP - SCN range: 0x0931.ec587602 - 0x0931.ec587602
DBID 639780530 branch 1000850613
FAL[client]: All defined FAL servers have been attempted.
Check that the CONTROL_FILE_RECORD_KEEP_TIME initialization
parameter is defined to a value that's sufficiently large
enough to maintain adequate log switch information to resolve