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When and why are database joins expensive?
...query optimiser will choose a table scan only when one or more of the following holds.
There are fewer than 200 rows in the relation (in this case a scan will be cheaper)
There are no suitable indexes on the join columns (if it's meaningful to join on these columns then why aren't they indexed? fi...
NOT using repository pattern, use the ORM as is (EF)
...search against database. Everything looks great in theory, but user's need wins above theory.
Again: An entity with 20+ fields is incorrectly modeled. It's a GOD entity. Break it down.
I'm not arguing that IQueryable wasn't made for quering. I'm saying that it's not right for an abstraction lay...
Linux反编译全攻略 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...0000 Base _init
080487a0 DF *UND* 000000d1 gtk_window_set_default_size
080487b0 DF *UND* 00000056 gtk_label_new
080487c0 DF *UND* 00000085 gtk_window_new
080487d0 DF *UND* 00000213 gtk_widget_set_uposition
08048...
CGRidCtrl控件 学习心得 - C/C++ - 清泛网 - 专注C/C++及内核技术
... nRow:指定行
nCol:指定列
lf :字体格式。LOGFONT是Windows内部字体的逻辑结构，主要用于设置字体格。详见LOGFONT结构体定义。
结果返回 ：如果成功，返回TRUE； 否则返回FALSE
2.4.2.8 SetItemFgColour
函数原型：BOOL SetItemFgC...
正则表达式 30 分钟入门教程 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...正则表达式就是记录文本规则的代码。
很可能你使用过Windows/Dos下用于文件查找的通配符(wildcard)，也就是*和?。如果你想查找某个目录下的所有的Word文档的话，你会搜索*.doc。在这里，*会被解释成任意的字符串。和通配符类似...
Memcached vs. Redis? [closed]
...ata, but only one is capable of reclaiming it.
Disk I/O dumping: A clear win for redis since it does this by default and has very configurable persistence. Memcached has no mechanisms for dumping to disk without 3rd party tools.
Scaling: Both give you tons of headroom before you need more than a s...
How would Git handle a SHA-1 collision on a blob?
...ally just reduced the hash size from 160-bit to 4-bit by applying the following diff and rebuilding git:
--- git-2.7.0~rc0+next.20151210.orig/block-sha1/sha1.c
+++ git-2.7.0~rc0+next.20151210/block-sha1/sha1.c
@@ -246,6 +246,8 @@ void blk_SHA1_Final(unsigned char hashou
blk_SHA1_Update(ctx, pad...
How to determine CPU and memory consumption from inside a process?
I once had the task of determining the following performance parameters from inside a running application:
9 Answers
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The case against checked exceptions
... number of years now I have been unable to get a decent answer to the following question: why are some developers so against checked exceptions? I have had numerous conversations, read things on blogs, read what Bruce Eckel had to say (the first person I saw speak out against them).
...
How to implement classic sorting algorithms in modern C++?
...draft Effective Modern C++ and Herb Sutter's revamped GotW. I use the following style recommendations:
Herb Sutter's "Almost Always Auto" and Scott Meyers's "Prefer auto to specific type declarations" recommendation, for which the brevity is unsurpassed, although its clarity is sometimes disputed....