BlogJava-因为专注，所以专业-文章分类-数据库http://www.blogjava.net/kevinzhan/category/36031.html我的Java Blog <script src="http://www.google-analytics.com/urchin.js" type="text/javascript"> </script> <script type="text/javascript"> _uacct = "UA-6064162-2"; urchinTracker(); </script>zh-cnThu, 25 Aug 2011 05:12:48 GMTThu, 25 Aug 2011 05:12:48 GMT60Win7安装oracle10g出现oui.exe has stopped working解决方法http://www.blogjava.net/kevinzhan/articles/356761.htmlkevin.zhankevin.zhanThu, 18 Aug 2011 02:02:00 GMThttp://www.blogjava.net/kevinzhan/articles/356761.htmlhttp://www.blogjava.net/kevinzhan/comments/356761.htmlhttp://www.blogjava.net/kevinzhan/articles/356761.html#Feedback0http://www.blogjava.net/kevinzhan/comments/commentRss/356761.htmlhttp://www.blogjava.net/kevinzhan/services/trackbacks/356761.html转载自：http://tallbirch.net/?p=208

如果你在VISTA或WIN7安装Oracle for vista时，可能会出现oui.exe has stopped working的提示。解决方法是把安装文件放到C盘根目录下就可以了。我就是这么解决问题的。

原文：

If you are trying to install Oracle client onto a Microsoft Vista computer, there is a possibility after executing the setup program and waiting for a few seconds you will get a pop-up window stating that oui.exe has stopped working. After a few more seconds of ‘trying’ to figure out what’s wrong, it stops — leaving you to click ok and wonder what happened.

Well, I ran across a random message (thanks oracle forum user user599812) that suggested that if you move your oracle setup folder closer to the root C:\ folder, you might solve your problem. I am here to say that we had this problem, and moving the folder to C:\ solved the problem.




kevin.zhan 2011-08-18 10:02 发表评论
]]>每个分类最新几条的SQL实现http://www.blogjava.net/kevinzhan/articles/299334.htmlkevin.zhankevin.zhanThu, 22 Oct 2009 05:07:00 GMThttp://www.blogjava.net/kevinzhan/articles/299334.htmlhttp://www.blogjava.net/kevinzhan/comments/299334.htmlhttp://www.blogjava.net/kevinzhan/articles/299334.html#Feedback0http://www.blogjava.net/kevinzhan/comments/commentRss/299334.htmlhttp://www.blogjava.net/kevinzhan/services/trackbacks/299334.html

分类统计的时候，我们经常会碰到这样的需求，每个类按照一定顺序，取几条数据，然后在一起显示。这个问题的解决方法，我们通过搜索引擎，可以找到很多种，但是不是SQL语句过于复杂，就是在数据量非常庞大的时候，性能就成了问题。

数据结构：

    create table tb(

        count int not null,

        type varchar(32) not null

    )

解决方案：

    select count, type from (select count, type, row_number() over(partition by type order type count desc) as rowindex from tb) t where rowindex <= 10 



kevin.zhan 2009-10-22 13:07 发表评论
]]>Postgre SQL日期的比较效率很低.http://www.blogjava.net/kevinzhan/articles/254125.htmlkevin.zhankevin.zhanTue, 10 Feb 2009 13:09:00 GMThttp://www.blogjava.net/kevinzhan/articles/254125.htmlhttp://www.blogjava.net/kevinzhan/comments/254125.htmlhttp://www.blogjava.net/kevinzhan/articles/254125.html#Feedback0http://www.blogjava.net/kevinzhan/comments/commentRss/254125.htmlhttp://www.blogjava.net/kevinzhan/services/trackbacks/254125.html 结果:在Postgre SQL 中,日期的比较所耗的时间比字符串比较所耗的时间长.



kevin.zhan 2009-02-10 21:09 发表评论
]]>数据库的死锁是如何产生的http://www.blogjava.net/kevinzhan/articles/241012.htmlkevin.zhankevin.zhanMon, 17 Nov 2008 10:33:00 GMThttp://www.blogjava.net/kevinzhan/articles/241012.htmlhttp://www.blogjava.net/kevinzhan/comments/241012.htmlhttp://www.blogjava.net/kevinzhan/articles/241012.html#Feedback0http://www.blogjava.net/kevinzhan/comments/commentRss/241012.htmlhttp://www.blogjava.net/kevinzhan/services/trackbacks/241012.html简单地说，死锁的产生是由于两个或多个线程之前有循环相关性引起的。
如运行事务1的线程T1具有了table1上的排它锁，运行事务2的线程T2有table2的排它锁，并且之后T2需要获取table1的资源。但是T1已经具有了table1的排它锁，所以T2在等待。当T1在使用table1还没有释放的同时，也需要获取table2的资源，这时死锁就产生了，因为table2被T2上了排它锁。



kevin.zhan 2008-11-17 18:33 发表评论
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