Error: ORA-00845 after Oracle 11gR2 is started

There are already many examples of this error on the Internet. I will record it myself.

Error: ORA-00845 after Oracle 11gR2 is started

Rac1:/home/oracle> sqlplus/as sysdba;

SQL * Plus: Release 11.2.0.3.0 Production onTue Feb 14 09:11:41 2012

 

Copyright (c) 1982,201 1, Oracle. All rights reserved.

Connected to an idle instance.

SQL> startup

ORA-00845: MEMORY_TARGET not supported onthis system

This error has been handled before, because the tmpfs size MEMORY_TARGET setting will report this error.

Processing

[Root @ localhost ~] # Umount tmpfs

(Busy may be returned here. Restart it and then umount)

[Root @ localhost ~] # Mount-t tmpfs shmfs-o size = 1g/dev/shm (no restart required)

[Root @ localhost ~] # Vi/etc/fstab (restart to take effect here)

Tmpfs/dev/shm tmpfs ults, size = 1g 0 0

[Root @ localhost ~] # Df-h
File System capacity used available % mount point
/Dev/mapper/VolGroup00-LogVol00
18G 15G 2.2G 87%/
/Dev/sda1 99 M 12 M 82 M 13%/boot
/Dev/hdc 2.9G 2.9G 0 100%/media/RHEL_5.3 i386 DVD
Shmfs 1.0G 0 1.0G 0%/dev/shm

[Root @ localhost ~] # Su-oracle

SQL * Plus: Release 11.2.0.1.0 Production ction on Mon Jun 25 15:00:48 2012

Copyright (c) 1982,200 9, Oracle. All rights reserved.

Connected to an idle instance.

SQL> startup
ORACLE instance started.

Total System Global Area 422670336 bytes
Fixed Size 1336960 bytes
Variable Size 281020800 bytes
Database Buffers 134217728 bytes
Redo Buffers 6094848 bytes