oracle support一次危机处理（之一）
天有不测风云，
IBM 的中端磁盘阵列这次又惹祸了。在微码升级的时候，
DS4800 发生故障。IBM工程师把阵列故障恢复后，拍拍屁股走人，留下了阵列上不一致的数据。
没办法，阵列上的数据又得我们来想办法抢救了。。。。
还好有oracle support的支持我们最终化解了这次危机。下文详细介绍了整个恢复的过程。
oracle工程师到达现场后，根据错误信息，
问题情况如下SR信息所示：（HP-UX PA-RISC (64-bit)+ORACLE 9.2.0.8.0.+filesystem+no archivelog mode+no backup)
** Customer's Management 24x7 contact name:***************
** Customer's Management 24x7 contact number: ****************
** Primary Customer contact name: *******************
** Current Customer 24x7 voice phone number: ********************
** Current Customer E-mail address: ********************
** Current Customer Pager/Fax number: *****************
### Characteristics of Problem ###
This is a critical production system
Database is down and will not start
Data corruption issue and media recovery failed to fix the problem
### Note:28814.1 did not help because: ###
It did not have the needed information.
### Other: Note:28814.1 did not help because: ###
Sys owned objects corrupted
### The corruption was detected on: ###
Data file.
### Other: The corruption was detected on: ###
system tablespace
### The corruption affected a segment of type: ###
Table.
### Other: The corruption affected a segment of type: ###
TRANSACTION MANAGED DATA BLOCK
### The affected segment belongs to: ###
Database Dictionary.
### Other: The affected segment belongs to: ###
Database dictionary
### What error(s) and message(s) are Oracle reporting? ###
09:52:24 SQL> recover database allow 1 corruption;
ORA-00283: recovery session canceled due to errors
ORA-10562: Error occurred while applying redo to data block (file# 1, block# 1490)
ORA-10564: tablespace SYSTEM
ORA-01110: data file 1: '/oradata/yincang/rlv_system'
ORA-10561: block type 'TRANSACTION MANAGED DATA BLOCK', data object# 201
ORA-00600:
相关文档：
select trunc(sysdate ,'yyyy') from dual --本年度第一天
select trunc(sysdate ,'mm') from dual --本月第一天
&nbs ......
【示例1.1】 查询雇员编号为7788的雇员姓名和工资。
步骤1：用SCOTT/TIGER账户登录SQL*Plus。
步骤2：在输入区输入以下程序：
/*这是一个简单的示例程序*/
SET SERVEROUTPUT ON
DECLARE--定义部分标识
v_name VARCHAR2 ......
【训练6.1】 使用隐式游标的属性，判断对雇员工资的修改是否成功。
步骤1：输入和运行以下程序：
BEGIN
UPDATE emp SET sal=sal+100 WHERE empno=1234;
IF SQL%FOUND THEN
DBMS_OUTPUT.PUT_LINE('成功修改雇员工资！');
......
在学习oracle的时候遇到了一个问题，当我登录scott用户的时候怎么就是链接不上，出现了以下错误提示，the account is locked,说明scott用户被锁住了，我就进行了解锁，语句如下：alter user soctt account unlock;执行完以后发现又提示了一个错误信息，No Connect
无法链接，后来在网上查了查，终于找� ......
