误删除$ORACLE_HOME/dbs下的参数文件和密码文件后如何快速重建？

[oracle@11g dbs]$ pwd

/home/oracle/app/oracle/product/11.2.0/dbhome_1/dbs

[oracle@11g dbs]$ ll

total 24

-rw-rw----. 1 oracle oinstall 1544 mar 11 13:46 hc_orcl.dat

-rw-r--r--. 1 oracle oinstall 2851 may 15 2009 init.ora

-rw-r-----. 1 oracle oinstall 658 feb 16 05:17 initorcl.ora

-rw-r-----. 1 oracle oinstall 24 feb 16 05:17 lkorcl

-rw-r-----. 1 oracle oinstall 1536 feb 16 05:17 orapworcl

-rw-r-----. 1 oracle oinstall 3584 mar 11 14:19 spfileorcl.ora

[oracle@11g dbs]$ rm -rf *

total 0

[oracle@11g dbs]$ orapwd file=/home/oracle/app/oracle/product/11.2.0/dbhome_1/dbs/orapworcl password=oracle

sql> create pfile from memory;

file created.

[oracle@11g dbs]$ ll

-rw-rw----. 1 oracle oinstall 1544 mar 11 16:55 hc_orcl.dat

-rw-r--r--. 1 oracle oinstall 5562 mar 11 16:44 initorcl.ora

-rw-r-----. 1 oracle oinstall 24 mar 11 16:55 lkorcl

-rw-r-----. 1 oracle oinstall 1536 mar 11 16:38 orapworcl

sql> shutdown immediate;

database closed.

database dismounted.

oracle instance shut down.

sql> startup;

oracle instance started.

total system global area 835104768 bytes

fixed size 2217952 bytes

variable size 520095776 bytes

database buffers 310378496 bytes

redo buffers 2412544 bytes

database mounted.

database opened.