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1 解决Oracle 9.2.0.6版本数据库由于ORA-07445宕机问题
故障现象：
XX网数据库宕机，查看日志发现以下内容：

Wed Jun  8 20:24:17 2005
Errors in file /u02/app/oracle/admin/unicom/udump/unicom_ora_661.trc:
ORA-07445: \263\366\317\326\322\354\263\243: \272\313\320\304\327\252\264\242 [0000000101C3089C] [SIGSEGV] [Address not mappe
d to object] [0x000000000] [] []
Wed Jun  8 20:24:22 2005
Errors in file /u02/app/oracle/admin/unicom/bdump/unicom_pmon_11598.trc:
ORA-07445: exception encountered: core dump [0000000101C399A0] [SIGSEGV] [Address not mapped to object] [0x000000000] [] []
Wed Jun  8 20:24:23 2005
Errors in file /u02/app/oracle/admin/unicom/bdump/unicom_pmon_11598.trc:
ORA-07445: exception encountered: core dump [0000000101C399A0] [SIGSEGV] [Address not mapped to object] [0x000000000] [] []
ORA-00602: internal programming exception
ORA-07445: exception encountered: core dump [0000000101C399A0] [SIGSEGV] [Address not mapped to object] [0x000000000] [] []
Wed Jun  8 20:24:33 2005
CKPT: terminating instance due to error 472
Instance terminated by CKPT, pid = 11604
Wed Jun  8 21:04:47 2005
Starting ORACLE instance (normal)

解决办法：
Oracle工程师建议安装Oracle补丁p3949307_9206_SOLARIS64，经过测试，安装步骤如下：（注意，首先shutdown数据库）
1，解压补丁文件
unzip p3949307_9206_SOLARIS64.zip
解开后的目录是：4060756
2，修改oraclehomeproperties.xml文件，该文件在$ORACLE_HOME/inventory/ContentsXML目录下。
cp oraclehomeproperties.xml oraclehomeproperties.xmlb.bak
vi oraclehomeproperties.xml
更改数字453 －>23,存盘退出
3，修改PATH路径为
PATH=$ORACLE_HOME/bin:/usr/ccs/bin:${PATH}
4，执行opatch apply命令
cd 4060756
$ORACLE_HOME/OPatch/opatch apply
5，安装成功后会出现如下结果
Updating inventory...
/oracle92/app/oracle/product/9.2.0.1/OPatch/opatch.pl version: 1.0.0.0.51
Copyright (c) 2001-2004 Oracle Corporation. All Rights Reserved.
OPatch succeeded.

2 查看Oracle表空间大小及利用率的SQL语句－非常实用的语句

set linesize 300
col 表空间名 for a30
SELECT UPPER(F.TABLESPACE_NAME) "表空间名",
D.TOT_GROOTTE_MB "表空间大小(M)",
D.TOT_GROOTTE_MB - F.TOTAL_BYTES "已使用空间(M)",
TO_CHAR(ROUND((D.TOT_GROOTTE_MB - F.TOTAL_BYTES) / D.TOT_GROOTTE_MB * 100,
2),
'990.99') "使用比",
F.TOTAL_BYTES "空闲空间(M)",
F.MAX_BYTES "最大块(M)"
FROM (SELECT TABLESPACE_NAME,
ROUND(SUM(BYTES) / (1024 * 1024), 2) TOTAL_BYTES,
ROUND(MAX(BYTES) / (1024 * 1024), 2) MAX_BYTES
FROM SYS.DBA_FREE_SPACE
GROUP BY TABLESPACE_NAME) F,
(SELECT DD.TABLESPACE_NAME,
ROUND(SUM(DD.BYTES) / (1024 * 1024), 2) TOT_GROOTTE_MB
FROM SYS.DBA_DATA_FILES DD
GROUP BY DD.TABLESPACE_NAME) D
WHERE D.TABLESPACE_NAME = F.TABLESPACE_NAME
ORDER BY 4 DESC;

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解决Oracle 9.2.0.6版本数据库由于ORA-07445宕机问题

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