不能ping通hostname

[oracle@xifenfei ~]$ hostname
xifenfei
[oracle@xifenfei ~]$ ping xifenfei
ping: unknown host xifenfei
[oracle@xifenfei ~]$ nslookup
> xifenfei
;; connection timed out; no servers could be reached
> exit
[oracle@xifenfei ~]$ more /etc/hosts
# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1    xifenfei1 localhost.localdomain localhost

10G中存在问题

[oracle@xifenfei ~]$ sqlplus / as sysdba
SQL*Plus: Release 10.2.0.1.0 - Production on Tue Apr 3 01:54:22 2012
Copyright (c) 1982, 2005, Oracle.  All rights reserved.
Connected to an idle instance.
--sqlplus连接非常慢
SQL> startup
ORA-00600: internal error code, arguments: [keltnfy-ldmInit], [46], [1], [], [], [], [], []
--ORA-00600[keltnfy-ldmInit]错误

11G中存在问题

[oracle@xifenfei ~]$ sqlplus / as sysdba
SQL*Plus: Release 11.2.0.3.0 Production on Tue Apr 3 02:02:29 2012
Copyright (c) 1982, 2011, Oracle.  All rights reserved.
Connected.
SQL> startup
ORA-00119: invalid specification for system parameter LOCAL_LISTENER
ORA-00130: invalid listener address '(ADDRESS=(PROTOCOL=TCP)(HOST=xifenfei)(PORT=1521))'
--因为不能ping通xifenfei，提示LOCAL_LISTENER错误
--修改pfile文件
local_listener='(ADDRESS=(PROTOCOL=TCP)(HOST=127.0.0.1)(PORT=1521))'
--启动数据库
SQL> startup pfile='/tmp/pfile'
ORACLE instance started.
Total System Global Area  368263168 bytes
Fixed Size                  1345016 bytes
Variable Size             306186760 bytes
Database Buffers           54525952 bytes
Redo Buffers                6205440 bytes
Database mounted.
Database opened.
[oracle@xifenfei ~]$ ps -ef|grep ora_
oracle    5960     1  0 02:09 ?        00:00:00 ora_pmon_ora11g
oracle    5964     1  0 02:09 ?        00:00:00 ora_psp0_ora11g
oracle    5970     1  1 02:09 ?        00:00:00 ora_vktm_ora11g
oracle    5976     1  0 02:09 ?        00:00:00 ora_gen0_ora11g
oracle    5980     1  0 02:09 ?        00:00:00 ora_diag_ora11g
oracle    5984     1  0 02:09 ?        00:00:00 ora_dbrm_ora11g
oracle    5988     1  0 02:09 ?        00:00:00 ora_dia0_ora11g
oracle    5992     1  0 02:09 ?        00:00:00 ora_mman_ora11g
oracle    5996     1  0 02:09 ?        00:00:00 ora_dbw0_ora11g
oracle    6000     1  0 02:09 ?        00:00:00 ora_lgwr_ora11g
oracle    6004     1  0 02:09 ?        00:00:00 ora_ckpt_ora11g
oracle    6008     1  0 02:09 ?        00:00:00 ora_smon_ora11g
oracle    6012     1  0 02:09 ?        00:00:00 ora_reco_ora11g
oracle    6016     1  0 02:09 ?        00:00:00 ora_mmon_ora11g
oracle    6020     1  0 02:09 ?        00:00:00 ora_mmnl_ora11g
oracle    6028     1  0 02:09 ?        00:00:00 ora_s000_ora11g
oracle    6055     1  0 02:10 ?        00:00:00 ora_p000_ora11g
oracle    6059     1  0 02:10 ?        00:00:00 ora_p001_ora11g
oracle    6063     1  0 02:10 ?        00:00:00 ora_arc0_ora11g
oracle    6069     1  0 02:10 ?        00:00:00 ora_arc1_ora11g
oracle    6073     1  0 02:10 ?        00:00:00 ora_arc2_ora11g
oracle    6077     1  0 02:10 ?        00:00:00 ora_arc3_ora11g
oracle    6081     1  0 02:10 ?        00:00:00 ora_qmnc_ora11g
oracle    6089     1  0 02:10 ?        00:00:00 ora_q000_ora11g
oracle    6093     1  0 02:10 ?        00:00:00 ora_q001_ora11g
oracle    6141     1  0 02:11 ?        00:00:00 ora_d000_ora11g
oracle    6145     1  2 02:11 ?        00:00:00 ora_cjq0_ora11g
--数据库启动正常
[oracle@xifenfei ~]$ sqlplus / as sysdba
SQL*Plus: Release 11.2.0.3.0 Production on Tue Apr 3 02:10:37 2012
Copyright (c) 1982, 2011, Oracle.  All rights reserved.
Connected.
SQL> show parameter local_listener;
ORA-01012: not logged on
Process ID: 0
Session ID: 0 Serial number: 0
--sqlplus不能操作，而且sqlplus登录非常慢

监听异常

--监听配置文件
LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.10)(PORT = 1522))
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1522))
    )
  )
SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
     (GLOBAL_DBNAME = ora11g)
     (ORACLE_HOME = /u01/oracle/oracle/product/11.2.0/db_1)
     (SID_NAME = ora11g)
    )
  )
--启动监听
[oracle@xifenfei ~]$ lsnrctl start
LSNRCTL for Linux: Version 11.2.0.3.0 - Production on 03-APR-2012 02:19:52
Copyright (c) 1991, 2011, Oracle.  All rights reserved.
Starting /u01/oracle/oracle/product/11.2.0/db_1/bin/tnslsnr: please wait...
TNSLSNR for Linux: Version 11.2.0.3.0 - Production
System parameter file is /u01/oracle/oracle/product/11.2.0/db_1/network/admin/listener.ora
Log messages written to /u01/oracle/diag/tnslsnr/xifenfei/listener/alert/log.xml
Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.1.10)(PORT=1522)))
Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1522)))
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=192.168.1.10)(PORT=1522)))
--一直处于等待状态
--客户端登录
C:\Users\XIFENFEI>sqlplus sys/xifenfei@192.168.1.10:1522/ora11g
SQL*Plus: Release 11.2.0.3.0 Production on 星期二 4月 3 12:48:15 2012
Copyright (c) 1982, 2011, Oracle.  All rights reserved.
--一直hang住
[root@xifenfei admin]# netstat -an|grep 1522
tcp        0      0 192.168.1.10:1522           0.0.0.0:*                   LISTEN
tcp      260      0 192.168.1.10:1522           192.168.1.1:51977           ESTABLISHED
tcp        0      0 192.168.1.10:24317          192.168.1.10:1522           ESTABLISHED
tcp      198      0 192.168.1.10:1522           192.168.1.10:24317          ESTABLISHED
--这里显示已经连接

建议:在修改主机名时要慎重，修改的时候要确保/etc/hosts和/etc/sysconfig/network文件都被正确修改