rdbms

Down-Stream 配置一例

December 27, 2011 oracle, replication No comments

测试环境:

[oracle@liu ~]$ sqlplus ‘/as sysdba’

SQL*Plus: Release 10.2.0.1.0 – Production on Mon Dec 26 21:53:23 2011

Copyright (c) 1982, 2005, Or[……]

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Physical-standby standbylogfile checksum error

December 23, 2011 oracle, replication No comments

总结下今天DG碰到的问题,本来一个很简单的问题,被我们复杂化衍生出很多问题。

Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 – 64bit Production
With the Partit[……]

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BTREE索引浅解

December 22, 2011 maintain, oracle No comments

结构如下图所示:

对于分支节点块(包括根节点块)来说,其所包含的索引条目都是按照顺序排列的(缺省是升序排列,也可以在创建索引时指定为降序排列)。每个索引条目(也可以叫做每条记录)都具有两个字段。第一个字段表示当前该分支节点块下面所链接的索引块中所包含的最小键值;第二个字段为四个字节,表示所[……]

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一次LOB字段的查询导致的系统问题以及sql_id变化的探究

December 20, 2011 maintain, oracle No comments

16号早上10点左右发现系统变慢,查看等待事件 发现大量i/o salve wait, load 比值增加,等待语句sql_id为 38wm92jbxu0vf

09:59:30 up 80 days, 8:00, 2 users, load average: 16.02, 4.[……]

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Limitations of DRIVING_SITE Hint

December 19, 2011 maintain, oracle No comments

Limitations of DRIVING_SITE Hint

Applies to:

Oracle Server – Enterprise Edition – Version: 9.2.0.1 to 11.2.0.2
This problem can occur on a[……]

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快速升级Oracle 11.2.0.2 RAC到11.2.0.3 on Windows 2008

December 18, 2011 11g, oracle, RAC No comments

基于windows 2008平台升级rac 11.2.0.2.0->11.2.0.3.0

OS环境windows 2008 x64 数据库环境oracle 11g rac ,version 11.2.0.2.0 64bit

SQL> conn / as sysdba
已连接。
S[……]

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Scripts:curheaps.sql

December 17, 2011 Internals, oracle No comments

该script 显示各个cursor占用的heap大小

——————————————————————————–

— File name: curheaps.sq[……]

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[转] 11g Release 2 RMAN Backup Compression

December 16, 2011 11g, backup, oracle No comments

11g Release 2 RMAN Backup Compression
Oracle 11g Release 2 introduced compression algorithm levels which can be used for compressing table data, Data[……]

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Physical standby ORA-01274

December 16, 2011 oracle, replication No comments

今天新上线的系统物理备库出现以下错误:

[oracle@db-15 ~]$ sqlplus ‘/as sysdba’

SQL*Plus: Release 10.2.0.5.0 – Production on Fri Dec 16 20:37:38 2011

Copyright[……]

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11G新特性 IO Calibration 评测

December 13, 2011 11g, hardware, oracle No comments

11G新特性 IO Calibration可以帮我们估算出存储的读写性能,在使用这个特性之前 我们需要满足一些条件:

.在linux系统中默认是不开启异步IO的
SQL> show parameter filesystemio_options

NAME TYPE V[……]

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