lan optimizer

are deleted directly, and memory is recycled, as follows:Aged3. Eden is full againWhen the Eden Zone is allocated again, the small GC executes, the referenced objects are moved to the Survivor (survivor) area, and objects that refer to unreachable are removed from the garbage collection following Eden's emptying.It is important to note that this time the referenced object was moved to the survivor area of S1 .Also, the S0 region executes a small GC, moving objects that are also referenced to th

能回收很少的对象，一般使用的是标记整理或者标记清除算法In the above way, the whole process of GC has reached the most efficient state.It is important to note the use of replication algorithms in the generational recovery algorithm.The previously mentioned replication algorithm is to divide the memory into two, but in the generational recycling is not so, but according to Eden:survivor A:survivor b= 8:1:1, the specific process is (simplified version):1.新创建一个对象，默认是分在Eden区域，当Eden区域内存不够的时候，会触发一次Minor GC(新生代回收)，这次回收将存活的对象放到Surv

current task. So, if we want to not let the system kill our app, we can optimize it from the process level, memory consumption and so on. ConclusionThis article plus gc those things, we talked about two of theoretical knowledge, I believe you have a general understanding of the memory management of Android, the following will introduce some memory analysis tools and use, the actual to explain how to analyze memory problems.Anly_junLinks: Https://www.jianshu.com/p/4ad716c72c12Sourc

-flag Jstack: View information about the line stacks of the specified Java process;Jstack [-l] Jstack-f [-M] [-l] -l:long listings, additional lock information is displayed, so a deadlock occurs often with this option;-M: Mixed mode, both output Java stack information, also output C + + stack information;-F: When using "Jstack-l PID" no response, you can use-f force output information;Jstat: OutputStatistics for the specified Java processJstat-help|-optionsJstat-Jstat-options-class:class Loader-

blocks in the current query cache. These state variables allow you to understand the health of the query cache, allowing you to adjust the values of the corresponding system parameters.Limitations of Query Cache1. The previous version of 5.1.17 cannot cache the query of the variable, but starting with the 5.1.17 version, query cache has started to support the binding variable of query;2. External query SQL in all subqueries cannot be cache, only caches the final result set;3. Query in Proc

1, the article is very good writtenHttp://www.oschina.net/translate/making-sublime-text-2-beautifulUnfortunately, there is no write operation.Https://github.com/mrappleton/aqua-themeThe same project also has:Https://github.com/buymeasoda/soda-theme (This is the last use)Fortunately, there are documents on GitHub.2, OperationEnter the sublime Text2 directory:$ cd ~/library/application\ support/sublime\ text\ 2/packages/Download filegit clone https://github.com/buymeasoda/soda-theme/"Theme-soda"To

whileTrue:4 forKeyinchCurrent_layer:#Print the first level menu5 Print(Key)6Choice=input (">>:"). Strip ()#Select the second level menu7 ifChoiceinchCurrent_layer:8Last_layers.append (Current_layer)#Add the current layer menu to the previous menu before entering the next level menu9Current_layer=current_layer[choice]#The current layer menu is redefined and enters the loop to print the next level menuTen ifChoice==0:#Select menu layer is empty, end this loop One Con

the site ranking and entry is a merit, but not that SEO is hair outside the chain, in practice, the real site optimization seo, even if the outside chain will have a good ranking. Of course we are talking about the effect of the chain, so the rest of the discussion now is not deepened. If you want to let spiders know your link, the need to go to spiders often crawl local to put some Web site links, so that will attract spiders to crawl your site is not it? These import links we call the outside

frame picture as far as possible, so advertisers can not be happy. The following figure: Export the picture on it, and then we continue to use the lower part of the special GIF image compression tool to achieve the image compression. Lower: Via GIF optimizer software (specialized GIF compression software) Fourth step: After the download decompression run trouts gif optimizer.exe Open software, as shown in the following figure

You need to run Wamp first, and then double-click Zend to install the software, and continue to the next This step is mainly to select the server type, I have tried, choose other Web server can also. Then take note of a few steps as shown. Find the PHP.ini directory Locate the Appache directory, which is the root directory of the Web server. This step should be noted, be sure to stop first, wamp all the services, and then click OK. Ditto, open All services First, then click

select the software you want to analyze). Here I choose flashget (Internet Express) as an example, detailing how to optimize the master to make software green run version. Depending on the size and complexity of the software being analyzed, intelligent analysis may take several 10 seconds to a few minutes of time, when the analysis is complete, you can see in the associated File box in the bottom of the software is normal to run all the files, registry key information is also in it, as shown

, "ResponseLength" :20, " Millis ":0," execstats ":{" type ":" Collscan "," Works "NBSP;: 9, "yields" :0, "Unyields" :0, "invalidates" :0, " Advanced ":0," Needtime "Nbsp;:8, "Needfetch" :0, "IsEOF" :1, "docstested" :7, "Children" :[]}, "ts" :isodate ("2014-12-08t15:54:47.377z"), "Client" : "0.0.0.0", "allUsers" :[{ "user" : "__system", "DB" : "local" }], "user" : "[emailprotected]" } By executing the above statement, you can see that the detailed query information is recorded in the System.pr

current query cache. These state variables allow you to understand the health of the query cache, allowing you to adjust the values of the corresponding system parameters.Limitations of Query Cache1. The previous version of 5.1.17 cannot cache the query of the variable, but starting with the 5.1.17 version, query cache has started to support the binding variable of query;2. External query SQL in all subqueries cannot be cache, only caches the final result set;3. Query in Procedure,function

actual rows to retrieve the information in the table. It is recommended to take the index column. This allows you to avoid finding data in the actual table through the index. Returns the data for the indexed column directly. One query. 　　Otherwise, the index table is checked once, the actual table is checked once. 10.6 Using temporary in order to resolve the query, MySQL needs to create a temporary table to accommodate the results. A typical case is when a query contains a group by and an ORDER

: Http://www.zend.com/en/products/loader/downloads#Linux1. Decompressionwget HTTP://DOWNLOADS.ZEND.COM/GUARD/7.0.0/ZEND-LOADER-PHP5.6-LINUX-X86_64_UPDATE1.TAR.GZTAR-ZXVF ZENDGUARDLOADER-70429-PHP-5.4-LINUX-GLIBC23-X86_64.TAR.GZCD zendguardloader/#进入解压后的目录cat readme.txt# View the README document.2. Start the installationCopy the zendguardloader.so to PHP installation directory (/etc/httpd/modules directory or/usr/lib/httpd/modules directory, which is the same location) under the PHP version folde

{//TODO auto-generated m Ethod stub PreparedStatement PS = conn. Preparestatement("DELETE from Tbl_user WHERE id=?");Ps. Setlong(1, the user. GetId());Ps. Execute();} } Wrote a test class to insert a row of data into the tbl_user.The specific code is as follows: Public class daotest { /** * @param args * * Public Static void Main(string[] args) {Connection conn =NULL;Try{conn = Connectionfactory.getinstance (). MakeConnection (); Conn.setautocommit (false); Userdao Userdao =NewUs

that needs to be evaluated is more than 1 trillion (the exact number is 1,307,674,368,000). Use the Optimizer_search_limit parameter to set the limit By using the Optimizer_search_limit parameter, you can specify the maximum number of connection combinations to be evaluated by the optimizer. Using this parameter, we will be able to prevent the optimizer from consuming an indefinite amount of time to eval

When you submit a query, MySQL analyzes it to see if you can do some optimizations to make it faster to process the query. This section describes how the query optimizer works. If you want to know the optimization method used by MySQL, you can view the MySQL reference manual. Of course, the MySQL query optimizer also uses the index, but it also uses some other information. For example, if you submit a quer

turn it off. Ubuntu is off by default. Register_globals = Off 6. Do not open the remote address, remember the recent PHP include that vulnerability? is to include a variable in a PHP program, then the intruder can use the control server to execute a remote PHP program locally, such as Phpshell, so we close this. Allow_url_fopen = Off Install Zend Optimizer After downloading to get Zendoptimizer-3.3.0a-windows-i386.exe, directly double-click t

8.9 controlling the Query Optimizer 8.9.1 Controlling Query Plan evaluation8.9.2 Controlling switchable Optimizations8.9.3 Index Hints MySQL provides optimal control through system variables, impact query plan evaluation, Control optimizer and index hints. 8.9.1 Controlling query Plan evaluation control query Planning evaluation The task of the query optimizer