cnd performance tips

PHP performance optimization (1)-Five Tips. 1. do not copy variables at will. sometimes, to make PHP code more clean, some new PHP users (including me) will copy the predefined variables to a variable with a shorter name. In fact 1. do not copy variables at will. Sometimes, to make PHP code more clean, some new PHP users (including me) will copy the predefined variables to a variable with a shorter name, i

term) {return outputterm = Term.replaceall (_regex, _replacement);} After optimization: Private final Pattern _pattern = Pattern.compile (_regex);p rivate string transform (string term) {return outputterm = _patte Rn.matcher (term). ReplaceAll (_replacement);} 5. Cache it as much as possible if you canStoring the results in the cache is also a way to avoid excessive overhead. There are now several implementations of the LRU (Least recently used) cache algorithm.6. The Intern method of s

PHP Optimization for PHP optimization is mainly related to the main parameters of php.ini adjustment and settings, the following we will look at some of the php.ini in the performance of the larger parameters should be set. # Vi/etc/php.ini(1) PHP function disabled find:Disable_functions =This option can set which PHP functions are prohibited, PHP has some functions of the risk is quite large, you can directly execute some system-level script command

prevents people from overwriting the length () method. In addition, if you specify a class to be final, all methods of that class are final. the Java compiler will look for opportunities for inline (inline) all final methods ( This is related to the specific compiler implementation ). This will increase the performance on average 50%. 1.6 Use local variables as much as possibleparameters that are passed when the method is called and temporary varia

You have completed your brand's new application, and everything works like a charm. To use your network. Everyone is happy. Then, suddenly, an explosive user killed your MySQL server and your website was closed. What's wrong? How can you stop it? The following are some tips for MySQL performance optimization, which will help you and your database. Focus on In the early stages of development, you should kno

Oracle Database 10g Performance Tuning tips and techniques is recommended. For Oracle performance test, diagnosis, analysis, and optimization, see! Chapter 2 Basic index principles (beginner developer and beginner dBA). For Oracle index optimization, refer! Chapter 4 tuning the database with initialization parameters (DBA), optimize the Oracle database by a

Here are some tips on optimizing client JS performance: 1. About the JS cycle, the cycle is a common flow control. JS provides three kinds of loops: for (;;), while (), for (in). In these three loops, for (in) is the least efficient because it needs to query the hash key, so as little as possible in the for (in) loop, for (;;), while () loop performance is basic

string ';Bad:$type = "mixed";$output = "This is a $type string";Good:$type = ' mixed ';$output = ' This is a '. $type. ' String ';3. Use the Echo function to output a stringUsing the Echo () function to print out the results is easier to read, and in the next example you can see better performance.Bad:Print ($myVariable);Good:Echo $myVariable;4. Do not use connectors in EchoMany PHP programmers (including me) do not know when to use the stench to output multiple variables, you can actually use

statement instead of the If/else statement will have better performance and the code is easier to read and maintain. Bad: if ($_post[' action ' = = ' Add ') { addUser ()} elseif ($_post[' action '] = = ' Delete ') { deleteuser ()} elseif ($_ post[' action ' = = ' edit ') { edituser ();} else { defaultaction ();} Good: Switch ($_post[' action ']) {case ' add ': addUser (); Break;case ' delete ': deleteuser (); Break;case ' edit ': edituser

request to a variable5. How to make jmeter reduce the resource consumption of presses (simulate more users)6. JMeter How to parameterize (read parameterized data from a CSV file)7. JMeter Distributed Testing (pros and cons)8. Jmeter BSF Processor9. Jmeter Discussion section, more discussion materials yoJmeter Tutorial Summary Listiv. Jmeter Source code and Jmeter build environment (want to do two development for Jmeter see)Eclipse build jmeter compilation environment documentation free download

="#00000000" android:scrollingCache="false" android:animationCache="false" android:smoothScrollbar="true" android:visibility="gone" />5. Reduce the depth of the item's layoutWe should try to reduce the item layout depth, because when we slide the ListView, this leads directly to the measurement and drawing, so it wastes a lot of time, so we should remove some unnecessary layout nesting relationships. Reduce Item Layout Depth6. Using ViewholderThis people should be ver

functionality consumes more resources, so if you can use string processing methods such as the STR_ series instead of regular, try to use the string processing method.4, the reference file using absolute path ... /etc relative directory references will cause the script to find the corresponding resource from the current directory when invoking the related resource, which is not as obvious as pointing directly to the target.5. use single quotes as much as possible for strings . Double-quoted str

Performance Tuning Tips any programming model has a common performance flaw, asp.net is no exception. This section describes some of the ways you can avoid performance bottlenecks in your code. 1. Disable session state when not in use: Not all applications or pages require session state based on each user. If you

In browsing through the web, the search box is usually the last hurdle that leads to user use. If your site contains a lot of features, features, design elements, products and services, and so on, the search box becomes an integral part of the site. The growth of the website often takes time. Of course, from the whole design and development process of the site, the design must be concise, with articles and comments, as well as informal site announcements, features and services, and so on. Howeve

;/*+leading (TABLE) */Takes the specified table as the first table in the join order./*+cache (TABLE) */When a full table scan is performed, the cache hint is able to place the retrieved block of the table in the buffer cache most recently used in the least recent list of LRUFor example:SELECT/*+full (BSEMPMS) Cahe (BSEMPMS) */Emp_nam from Bsempms;/*+nocache (TABLE) */When a full table scan is performed, the cache hint is able to place the retrieved block of the table in the buffer cache most re

-mm-dd hh24:mi:ss ') >= ' 2016-01-01 00:00:00 ' andTo_char (T.createtime, ' yyyy-mm-dd hh24:mi:ss ') Group BY To_char (T.createtime, ' yyyy-mm-dd hh24:mi:ss ')Order by count (1) desc;MySQL Implementation method:date_format+ GROUP by + order by; (Modify the second parameter in the Date_format to modify the precision to min or hour)Example: Select Date_format (start_time, '%y%m%d%h%i%s ') Isecond,count (ID) as icount from Mtable t whereT.start_time between ' 2017-06-01 00:00:00 ' and ' 2017-06-01