逻辑读，当前读，一致读，和物理读

Yong Huang

原帖由 sundog315 于 2010-8-29 18:35 发表

有没有好的文档管理软件推荐？

Is 文档管理软件 something like Desktop Search program? What can 文档管理软件 do that a desktop search program cannot? I can't think of anything.

So, as I said, I currently use Google Desktop Search. It still misses some documents in its index database, plus some other minor problems, but no other similar program is perfect.

Yong Huang

红叶DBA

原帖由 Yong Huang 于 2010-8-30 07:30 发表


I made a mistake in my last message (#14). My note
http://yong321.freeshell.org/computer/diskreadunit.txt
really proves that in the case of v$sql(area) and tkprof, "physical reads" refers to number of blocks, not number of times of read. I simply remembered backward. I made the change in my msg #14. Please read it.

The statistic "physical reads" is clearly defined in Reference manual as number of blocks, so people won't blame Oracle, except for its misleading use of the English phrase.

Yong Huang

I hava already read it , Thank you very much !

aktt12

原帖由 Yong Huang 于 2010-8-29 03:43 发表


Yes, I make notes a lot, all electronically. I save important messages in a text or html file on my local hard drive, occasionally save a PDF file. If I have some thoughts, I either write and save it to a file locally, or if it's mature enough I post it to my own web site. Both are searchable. Locally, I use Google Desktop Search. In the past I tried Copernic and Microsoft Desktop Search. All have their own problems. Without desktop search, my study can't be that efficient.

However, nothing beats a human brain. Some of the things are too difficult to search because there's no clear keyword to use. You just have to remember them.

Yong Huang

非常感谢您分享的经验~高效的学习方法很有必要

伊斯力

把你们说的都看了一遍  受教很多啊   笔记管理工具其实可以用mybase之类的

tom_fans

maybe contain is better than include

Yong Huang

原帖由 tom_fans 于 2010-9-1 04:06 发表
maybe contain is better than include

You're referring to this sentence?

> A logical read is a read from memory or disk. So it includes both.

Mmm, I'm not sure what difference there is.

Yong Huang