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the entire Java description of the content. It can be said that learning Java programming, most of the time is spent looking at the documentation above. I was carrying, write Java code, at any time to view, a moment of the hand. Third, Application server (app server) App Server is a platform for running Java Enterprise Components, which forms the main operating environment of the application software. The current mainstream app server is Bea's WebLogic server and IBM's WebSphere and free JBo

Finalcut Pro, Apple QuickTime Pro, Avid Xpress DV, discreet Cleaner, Discreet Cleaner xl. Here, take the most common player software QuickTime Pro for example: First open the video file you want to convert in QuickTime Pro. Then select the Output option in the File menu, locate the FLV in the file type of the dialog box that appears, and determine the location and name of the build file save. The out

(rewire)" Association without affecting or impacting the actual application code. This is a recurring theme in the various IOC frameworks, and is generally a good practice to follow. A small example I like to understand concepts faster through examples. Here's a set of examples using the IOC; you'll see that the complexity of these examples is incremental. Most people use their dependency injection (inject dependency) function when they start using the IOC container-that is, declaratively assoc

after emptying the cache, it will adversely affect performance. Therefore, this practice should be regarded as a means of fault removal, there is no need to conduct regular routine. The method of emptying the cache is best used by other apps, rather than being removed step by piece. Can be used Cocktail, Leopard cache Cleaner or Tiger cache Cleaner. 3. Repair and Backup properties file (plist) In the s

Recently, a lot of users asked why the U disk will be written to protect the U disk write protection to do, how should it be lifted? U disk write protection, the files on the U disk can only be read can not be deleted, can be modified but not saved, although the virus is very effective, but also to the user has brought trouble. How to solve the write protection of U disk? So today's small series on this phenomenon to introduce three quick solutions, for reference only. The first method: 1

GC on applications to a certain extent. However, the JVM does not directly manage these out-of-heap memory, and there is a risk of OOM, which limits the amount of out-of-heap memory requested by the JVM startup parameter plus-xx:maxdirectmemorysize The Directbytebuffer object represents the out-of-heap memory, which holds the Cleaner object in the Directbytebuffer object, which uniquely holds the data, start address, size, and capacity of the out-of

) I/O thread9State:waiting forcompleted AIO requests (write thread) Pending normal AIO reads:0 [0, 0, 0, 0], Aio writes:0 [0, 0, 0, 0], Ibuf Aio reads:0,LogI/O's:0, sync I/O'S0Pending Flushes (fsync)Log:0; Buffer pool:0188OSfileReads27180OSfileWrites,26031OS Fsyncs0.00Reads/S0 avgbytes/Read,0.00Writes/S0.00Fsyncs/SAs you can see, InnoDB has 10 IO Thread, 4 write, 4 read, 1 insert buffer, and one log thread, respectively.3. Perge ThreadAfter the transaction is committed, undo log may no longer be

MySQL, and then run a program to populate the index asynchronously so that it does not interfere with our normal service. Therefore, we will have more tables later than before, but it is easy to add and remove indexes. We have a deeply optimized program to populate the new index (called "Cleaner"), so you can quickly populate the index without interfering with the site's normal service. Instead of a week, we can store new attributes and index them in

will block the user query thread. Starting with the innodb1.2.x version, this check is placed in a separate page Cleaner thread, and the user can innodb_lru_scan_depth control the number of pages available in the LRU list by default of 1024. Async/sync Flush Checkpoint When redo log files are not available, you need to force some pages in the dirty pages list to be flushed back to disk. This ensures that redo log files can be reused. Before the innod

disk mainly in a few cases: Master thread executes once per second. When things are submitted. Redo log buffer has less than 1/2 remaining space. Additional Pool of memoryMemory allocations to some of the data structures themselves are allocated from additional memory pools. Threading Master ThreadResponsible for asynchronously flushing data from the cache pool to disk, including dirty pages. Merge Insert buffer, Undo page recycle, and so on.IO ThreadInnoDB uses AIO

performed at run time using the fuzzy checkpoint. Some dirty pages are refreshed in the following ways: Master Thread Checkpoint Flush_lru_list Checkpoint Async/sync Flush Checkpoint Dirty Page Too much Checkpoint Master Thread CheckpointThe Master thread refreshes a percentage of the page-back disk from the dirty pages list of the buffer pool at a rate of every second or every 10 seconds. This process is asynchronous and does not block the query thread.Flush_lru_list

undo page. Prior to the InnoDB1.1 version, the purge operation was done only in the master thread. InnoDB1.1 start, the purge operation can be performed independently of the purge thread. Use the following configuration to enable the standalone purge Thread: innodb_purge_threads=1 The InnoDB1.2 version starts to support multiple purge Thread, speeding up the recovery of the undo page. The random read performance of the disk can be further exploited because the Undo page is read in a discrete w

manually declaring a set merge. So far it's good. It's time to cite some of the powerful examples that highlight the stream API. Group all the articles according to the author. As usual, we use a recycling scheme. PublicMapGroupbyauthor () {MapNewHashmap(); for(article article:articles) {if(Result.containskey (Article.getauthor ())) {Result.get (Article.getauthor ()). Add (article); } Else{ArrayListNewArraylist(); Articles.add (article); Result.put (Article.getauthor (), arti

: 1GB or above recommended(3) It is recommended to allocate more than 8G of free spaceVMware installation, available in English and Chinese versionSelect Typical Typical installation--Choose the installation location (except for the C drive)--Remove the check for product update on the front of the star Tup without updating the virtual machine--remove help improve VMware Workstation Front tick, do not send error to VMware, always nextUninstall VMware, uninstall it in the program, and remove it wi

-s/bin/bash-g robin-d/home/robin-m Robin (this way the user name can be written, but more rules):-S where to create the user with whatcommand Parser,-G indicates that the created user belongs to which user group,-D, indicates the user's home directory is created, and the user name is finally written. At the same time, this method is not prompted to create a password at the time of creation.So after creating the user first to reset the password, syntax: PASSWW user name. (When creating a user, yo

This was come from http://blog.lyhdev.com/2013/01/ubuntu-linux-apt-get.htmlTo remove a software suite under Ubuntu, the instructions used are apt-get remove, for example:sudo apt-get remove Texlive-fullHowever, since this kit was previously installed, it will be a self-installing dependency kit (dependencies), so it needs to be cleaned with autoremove.sudo apt-get autoremoveOr add a reference at remove:sudo apt-get remove--auto-removeBut this is not yet clean, because the preset remove acts to p

. # Delta compression using up to 4 threads. # compressing objects:100% (1378/1378), done. # Writing objects:100% (2437/2437), done. # Total 2437 (Delta 1461), reused 1802 (Delta 1048) Note that you can also achieve this by pushing your filtered history to a new or empty repository and then making a fresh Clone from GitHub. Using the BFGThe BFG Repo-cleaner is a faster and simpler alternative to for git f

-cache Searchstring#在软件包列表中搜索字符串 Apt-Cache Show Package #显示可用软件包记录 aptitude:aptitude and Apt-Get, Debian and its derivative systems can be extremely powerful package management tools. and apt-Getthe difference is that aptitude is better at dealing with dependency issues. For example, when aptitude deletes a package, it also deletes the packages it depends on. This way, the system will not be left with useless packets, the whole system is cleaner. Comm

panels, dictionaries, screen savers, and landing items. Click "View all Extensions", which can be disabled or removed according to the actual situation.Figure Four: CleanMyMac3 extensionMillThe grinder can quickly erase any unwanted files or folders without leaving a trace. Click "Select File" to add any file or folder, then click "Crush".Figure V: CleanMyMac3 Grinderis the CleanMyMac3 Tutorial utility really very practical? We can use it to uninstall software, clear browsing history, erase fil

I. Annotations in Java annotationWhat is annotations: the data (metadata) used to describe the data.Special tags in Java code. It provides a formalized method for adding extra information that the Java program cannot express in the code, using the program elements that we can make available at some point in the future for these annotations to be decorated.Role:Store additional information about the program in a format that will be tested and validated by the compilerGenerate descriptor files, ev