七、行迁移与行链接 当一行的数据过长而不能插入一个单个数据块中时，可能发生两种事情：行链接(row chaining)或行迁移(row migration)。

在informix中有如下几种对字符串操作的类型： char(character),varchar,nchar,nvarchar,lvarchar,text 在ORACLE中有如下几种对字符串操作的类型： char(character),varchar(varchar2),nchar,nvarchar2,long,long raw及LOB类型

一、基本概念： 1、字符存储单位 2、char:定长的字符串类型 3、varchar：描述变长字符串

二、INFORMIX ORACLES数据类型对应长度及比较 informix Oracle 范围 默认长度 作为数据存储 变量 char 1~32767 1 1~2000 1~32767 varchar 1~255 1 1~4000 1~

三、字符比较： 1、char和varchar 2、char和nchar，varchar和nvarchar

四、oracle里的数据类型: 1、char,character,varchar,varchar2,nchar,nvarchar2的共同特点： 当插入空字符串时，则都会被转变为null

五、informix里的字符: 1、lvarchar在9.4版本之后才可以用带指定长度的方式，如lvarchar(3000)，不带长度则默认是2048字节，最大长度是32,739字节。 所以对于9.4之前的版本，不能用带长度的表达式，数据库会报语法错误。

六、oracle和informix表的限制 1、在informix的一个表中对以上字符串类型定义的总长度不能超过32767(不包括对大字段处理的text类型) 但是遇到varchar与nvarchar会再减1(为该列设置索引会留一位)，而遇到lvarchar则需要减3。 2、oracle限制的每个表的列的总数不能超过1000(此处没有测试),然后每个列的长度由其数据类型决定。 每个索引的最大列数 32

八、ORACLE－在设计数据库时如何选择正确的数据类型

I was a big 'Planet of The Apes' fan, so I was really excited about being in it. I had a really good time. I liked wearing all that stuff, and I liked playing the part.

Every picture tells a story

We are not made up, as we had always supposed, of successively enriched packets of our own parts. We are shared, rented, occupied. At the interior of our cells, driving them, providing the oxidative energy that sends us out for the improvement of each shining day, are the mitochondria, and in a strict sense they are not ours.

Don Quixote's 'Delusions' is an excellent read - far better than my own forthcoming travel book, 'Walking Backwards Across Tuscany.'

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A wise girl knows her limits a smart girl knows that she has none.

When people talk about the good old days I say to people Its not the days that are old its you thats old. I hate the good old days. What is important is that today is good.

Long-lived persons have one or two lines which extend through the whole hand; short-lived persons have two lines not extending through the whole hand.

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My mom is very confident and she was always a role model of mine.

I do like to wrap things up and leave some things to the readers' imagination.

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To sin is a human business, to justify sins is a devilish business.

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I'm trying to talk about challenging subjects people might not like and trying to find relief as we discuss it.

It's always a good idea to let the audience make up their own minds.

When done right - or wrong, depending on how you look at it - deficits remove liberal options from the table. Suddenly there's no money for building bridges or inspecting meat. Not surprisingly, running up a deficit is a strategy favored by the wrecking crew for its liberal-killing properties.

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We build too many walls and not enough bridges.