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In MySQL what does “Overhead” mean, what is bad about it, and how to fix it?
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Overhead is Data_free of a table, that is The number of allocated but unused bytes.
We can find it by SQL command SHOW TABLE STATUS. It is the free space in allocated size for your table.
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Copy entire contents of a directory to another using php
...ing recursively I found in this note on the copy documentation page:
<?php
function recurse_copy($src,$dst) {
$dir = opendir($src);
@mkdir($dst);
while(false !== ( $file = readdir($dir)) ) {
if (( $file != '.' ) && ( $file != '..' )) {
if ( is_dir($s...
实战Nginx与PHP（FastCGI）的安装、配置与优化 - 更多技术 - 清泛网 - 专注...
实战Nginx与PHP（FastCGI）的安装、配置与优化一篇介绍nginx和php-fmp配置，安装和使用的博文，文章将为何将nginx叫做反向代理服务器讲明白了，也能从中看出为什么ngnix会apache性能更加...一篇介绍nginx和php-fmp配置，安装和使用的博...
How can I get current location from user in iOS
...@end
MainFile
In the init method
locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
locationManager.distanceFilter = kCLDistanceFilterNone;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
[locationManager startUpdatingLocation];
Callback function
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“Notice: Undefined variable”, “Notice: Undefined index”, and “Notice: Undefined offset” using PHP
I'm running a PHP script and continue to receive errors like:
28 Answers
28
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Sort NSArray of date strings or objects
...escriptor as below:
NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"beginDate" ascending:TRUE];
[myMutableArray sortUsingDescriptors:[NSArray arrayWithObject:sortDescriptor]];
[sortDescriptor release];
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Are tuples more efficient than lists in Python?
...les can be reused instead of copied.
3) Tuples are compact and don't over-allocate.
4) Tuples directly reference their elements.
Tuples can be constant folded
Tuples of constants can be precomputed by Python's peephole optimizer or AST-optimizer. Lists, on the other hand, get built-up from scra...
Malloc vs new — different padding
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IIRC there's one picky point. malloc is guaranteed to return an address aligned for any standard type. ::operator new(n) is only guaranteed to return an address aligned for any standard type no larger than n, and if T isn't a character type then new T[n] i...
Remove excess whitespace from within a string
...xtra whitespace for you - make sure you have "\" before "s" :) some online-php-testing pages remove it :)
– jave.web
Jul 3 '16 at 11:27
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C/C++ maximum stack size of program
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Reserved is how much address space to allocate, committed is how much to attach backing storage to. In other words, reserving address space does not mean the memory will be there when you need it. If you never use more than 4K stack, you're not wasting real memor...