数据库参数和我的实例名称不一致
SQL> startup
Oracle instance started.
Total System Global Area 422670336 bytes
Fixed Size 1336960 bytes
Variable Size 402655616 bytes
Database Buffers 12582912 bytes
Redo Buffers 6094848 bytes
ORA-01102: cannot mount database in EXCLUSIVE mode
SQL> show user
USER is "SYS"
SQL> show parameter name
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
db_file_name_convert string
db_name string orcl
db_unique_name string orcl
global_names boolean FALSE
instance_name string tmp
lock_name_space string
log_file_name_convert string
service_names string orcl
SQL>
SQL> select status from v$instance;
STATUS
------------
STARTED
SQL>
SQL>
SQL> alter system set db_unique_name=tmp scope=spfile;
System altered.
再次启动OK!