问题是因后台无法登录发现该BUG的，连PLSQL及服务器上的Oracle DBA也无法登录oracle

查看系统相关资源：

负载高，系统层的CPU使用高， 解决方法： 重启服务器，问题解决

通过查找原因：

得到以下BUG而引起问题的所在

Oracle版本是10.2.0.1。只要Linux x86主机运行天数是是24.8的倍数都有可能引发该bug(刚刚好上面系统运行的时间是198天)，因为time()函数值为null，造成无限死循环，从而耗尽cpu。

该Oracle BUG的解决方法如下：

解决办法三种：1) 重启主机；

2) 打patch set，如升级到10.2.0.4；

3) 对该bug单独打临时patch 4612267。

第一种方法没有彻底解决问题，以后照旧；第二种方法，升级时间长，且要求停库很久，当前生产环境暂不适合；

参考文档：Doc ID: 338461.1 SQL*Plus 10.2.0.1 Hangs, When System Uptime Is Long Period of Time

Doc ID: 4612267.8 Bug 4612267 - OCI client spins when machine uptime >= 249 days

我采取的是第三种方法，打补丁包的方式。而且据oracle官方文档说明，oracle11已经修复该问题。

下面是pache 4612267补丁包的安装及验证方法：

先停监听、dbconsole和数据库

$ lsnrctl stop

$ emctl stop dbconsole

$ sqlplus / as sysdba

SQL> shutdown immediate

注意：dbconsole是在已经装了Oracle EM的情况下要停止，如果未安装则无需干涉。

安装patch

$ mkdir $ORACLE_BASE/patches

$ cd $ORACLE_BASE/patches

$ rz    (SecureCRT里上传p4612267_10201_LINUX.zip 文件， 其它上传方式也可以)

$ unzip p4612267_10201_LINUX.zip

$ cd 4612267/

$ $ORACLE_HOME/OPatch/opatch apply

Invoking OPatch 10.2.0.1.0

…

Please shutdown Oracle instances running out of this ORACLE_HOME on the local system.

(Oracle Home = '/u01/app/oracle/product/10.2.0/db_1')

Is the local system ready for patching?

Do you want to proceed? [y|n]

y    (此处输入y)

User Responded with: Y

…

ApplySession adding interim patch '4612267' to inventory

The local system has been patched and can be restarted.

OPatch succeeded.

验证patch

$ $ORACLE_HOME/OPatch/opatch lsinventory

Invoking OPatch 10.2.0.1.0

Oracle interim Patch Installer version 10.2.0.1.0

Copyright (c) 2005, Oracle Corporation. All rights reserved

Oracle Home       : /u01/app/oracle/product/10.2.0/db_1

Central Inventory : /u01/app/oracle/oraInventory

from           : /u01/app/oracle/product/10.2.0/db_1/oraInst.loc

OPatch version    : 10.2.0.1.0

OUI version       : 10.2.0.1.0

OUI location      : /u01/app/oracle/product/10.2.0/db_1/oui

Log file location : /u01/app/oracle/product/10.2.0/db_1/cfgtoollogs/opatch/opatch-2009_Jan_13_11-06-27-HKT_Tue.log

Lsinventory Output file location : /u01/app/oracle/product/10.2.0/db_1/cfgtoollogs/opatch/lsinv/lsinventory-2009_Jan_13_11-06-27-HKT_Tue.txt

--------------------------------------------------------------------------------

Installed Top-level Products (2):

Oracle Database 10g                                                  10.2.0.1.0

Oracle Database 10g Products                                         10.2.0.1.0

There are 2 products installed in this Oracle Home.

Interim patches (1) :

Patch 4612267      : applied on Tue Jan 13 11:05:10 HKT 2009

Created on 5 Oct 2005, 13:48:00 hrs US/Pacific

Bugs fixed:

4612267

--------------------------------------------------------------------------------

OPatch succeeded.

启动数据库、监听和dbconsole

$ sqlplus / as sysdba

SQL> startup

$ lsnrctl start

$ emctl start dbconsole

如果有需要，还可以删除patch，删除前先停库

$ cd $ORACLE_BASE/patches/4612267

$ $ORACLE_HOME/OPatch/opatch rollback -id 4612267

Invoking OPatch 10.2.0.1.0

…

Please shutdown Oracle instances running out of this ORACLE_HOME on the local system.

(Oracle Home = '/u01/app/oracle/product/10.2.0/db_1')

Is the local system ready for patching?

Do you want to proceed? [y|n]

y    (此处输入y)

User Responded with: Y

…

RollbackSession removing interim patch '4612267' from inventory

The local system has been patched and can be restarted.

OPatch succeeded.

此时再执行上面的验证patch命令就会发现该patch已经删除了。

注：

Running STRACE tool shows:

$ strace /oracle/home/bin/sqlplus -V 2>&1 |less

……

old_mmap(NULL, 385024, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x41794000

gettimeofday({1122996561, 411035}, NULL) = 0

access("/usr/local/UD/conf/sqlnet.ora", F_OK) = -1 ENOENT (No such file or directory)

access("/usr/local/UD/lib/oracle/network/admin/sqlnet.ora", F_OK) = -1 ENOENT (No such file or directory)

access("/usr/local/UD/conf/sqlnet.ora", F_OK) = -1 ENOENT (No such file or directory)

access("/usr/local/UD/lib/oracle/network/admin/sqlnet.ora", F_OK) = -1 ENOENT (No such file or directory)

fcntl64(-1218313656, F_SETFD, FD_CLOEXEC) = -1 EBADF (Bad file descriptor)

It is looping on the times() function.--死循环中

times(NULL) = -1825782405

times(NULL) = -1825782405

times(NULL) = -1825782405

times(NULL) = -1825782405

times(NULL) = -1825782405

times(NULL) = -1825782405

times(NULL) = -1825782405

系统资源过高的真正原因在于此！！