oracle 12C startup时报ora-03113 end-of-file on communication channel

SQL> startup;
ORACLE instance started.
Total System Global Area  771751936 bytes
Fixed Size        2929160 bytes
Variable Size     633343480 bytes
Database Buffers    130023424 bytes
Redo Buffers        5455872 bytes
Database mounted.
ORA-03113: end-of-file on communication channel
Process ID: 28259
Session ID: 243 Serial number: 50427

ORA-19815: WARNING: db_recovery_file_dest_size of 4781506560 bytes is 100.00% used, and has 0 remaining bytes available.
Thu Sep 03 10:45:19 2020
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You have following choices to free up space from recovery area:
1. Consider changing RMAN RETENTION POLICY. If you are using Data Guard,
Thu Sep 03 10:45:19 2020
Errors in file /u01/app/oracle/diag/rdbms/orcl/cdr1/trace/cdr1_arc2_28717.trc:
ORA-19815: WARNING: db_recovery_file_dest_size of 4781506560 bytes is 100.00% used, and has 0 remaining bytes available.
   then consider changing RMAN ARCHIVELOG DELETION POLICY.
2. Back up files to tertiary device such as tape using RMAN
Thu Sep 03 10:45:19 2020
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   BACKUP RECOVERY AREA command.
3. Add disk space and increase db_recovery_file_dest_size parameter to
You have following choices to free up space from recovery area:
   reflect the new space.
1. Consider changing RMAN RETENTION POLICY. If you are using Data Guard,
4. Delete unnecessary files using RMAN DELETE command. If an operating
   system command was used to delete files, then use RMAN CROSSCHECK and
   then consider changing RMAN ARCHIVELOG DELETION POLICY.
   DELETE EXPIRED commands.
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RMAN> delete archivelog all;
....
 Deleted 103 objects

SQL> alter database open;
Database altered.