oracle 优化之 找出低效率sql 语句
SELECT EXECUTIONS , DISK_READS, BUFFER_GETS,
ROUND((BUFFER_GETS-DISK_READS)/BUFFER_GETS,2) Hit_radio,
ROUND(DISK_READS/EXECUTIONS,2) Reads_per_run,
SQL_TEXT
from V$SQLAREA
WHERE EXECUTIONS>0
AND BUFFER_GETS > 0
AND (BUFFER_GETS-DISK_READS)/BUFFER_GETS < 0.8
ORDER BY 4 DESC;
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Oracle Flashback Technology
Oracle Flashback Technology reduces recovery time from hours to minutes.
from: http://www.oracle.com/technology/deploy/availability/htdocs/Flashback_Overview.htm
According to many studies, 40% of application outages are caused by operator or user errors. Part of be ......
对于刚接触unix的人而言,利用管道将各种命令组合在一起来实现某个功能,是比较难适应的一件事情,下面，我就用一个具体的例子,详细讲下着里面的用法和思路.看看到底我们把命令都绑在一起,unix都做了什么.
就用一个oracle管理中,可能会遇到的例子吧,如果oracle挂了， ......
http://blog.csdn.net/XIAOHUI_LIAO/archive/2007/08/27/1759990.aspx
create materialized view [view_name]
refresh [fast|complete|force]
[
on [commit|demand] |
start with (start_time) next (next_time)
]
as
{创建物化视图用的查询语句}
以上是 ......
本人以前整理的数据库文件迁移过程，希望能够对大家有所帮助
1、sqlplus "sys/sys@服务名 as sysdba"
2、修改控制文件:
alter system set control_files='E:\oracle\oradata\myOracle_1\control01.ctl',
'E:\oracle\oradata\myOracle_1\control02.ctl','E:\oracle\oradata\my ......
--创建写文件的存储过程
ALTER proc [dbo].[p_movefile]
@filename varchar(1000),--要操作的文本文件名
@text varchar(8000), --要写入的内容
@obj int
as
begin
declare @err int,
@src varchar(255),
&n ......
