ORA-03113: end-of-file on communication channel 磁盘慢，数据库启动失败

磁盘慢，数据库启动失败：
解决思路：1.让数据文件offline；
　　　　　2.删除表空间

SQL> startup pfile='/server/oracle/admin/test/pfile/inittest.ora'
ORACLE instance started.

Total System Global Area  776646656 bytes
Fixed Size		    2217384 bytes
Variable Size		  583010904 bytes
Database Buffers	  188743680 bytes
Redo Buffers		    2674688 bytes
Database mounted.
ORA-03113: end-of-file on communication channel
Process ID: 3466
Session ID: 1 Serial number: 5


SQL> startup mount
ORA-24324: service handle not initialized
ORA-01041: internal error. hostdef extension doesn't exist
SQL> quit
Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
[oracle@node2 trace]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.1.0 Production on Sun Oct 21 18:53:47 2018

Copyright (c) 1982, 2009, Oracle.  All rights reserved.

Connected to an idle instance.

SQL> startup mount
ORACLE instance started.

Total System Global Area  776646656 bytes
Fixed Size		    2217384 bytes
Variable Size		  583010904 bytes
Database Buffers	  188743680 bytes
Redo Buffers		    2674688 bytes
Database mounted.
SQL> drop tablespace beijing including contents and datafiles;     
drop tablespace beijing including contents and datafiles;

SQL> alter database datafile '/server/oradata/test/beijing.dbf' offline drop;

Database altered.

SQL> alter database open;

Database altered.

drop tablespace BEIJING_SPACE including contents and datafiles;