cnd performance tips

) name:@"IdleNotification" object:nil]; NSNotification *notification = [NSNotification notificationWithName:@"IdleNotification" object:nil]; [[NSNotificationQueue defaultQueue] enqueueNotification:notification 　　postingStyle:NSPostWhenIdle];} Five, memory optimization Use Autorelease pool to reduce memory spikes Six, Code details optimization 1, not in the viewwillapear time-consuming operation 2. If the key code is more efficient with C/C + + Seven, picture optim

This article is mainly to share with you the PHP performance optimization tips, hoping to help you write better PHP code. (1) foreach is more efficient, instead of using foreach as a while and for loop; (2) Inside the loop do not declare variables, especially objects such variables; (3) in multiple nested loops, if possible, the longest cycle should be placed in the inner layer, the shortest loop in the

Tips for improving PostgreSQL Performance In a (poor) PostgreSQL query, only a small change is required (ANY (ARRAY [...]). to ANY (VALUES (...))) the query time can be reduced from 20 s to 0.2 s. From the simplest use of explain analyze, to the use of EXPLAIN s community, there will be a hundred times of learning time investment to return. Use ipvs to monitor slow ipvs queries Earlier this week, a primary

Performance Tuning is not a simple task. There is no omnipotent solution at all, but you can use some basic principles to implement it. In general, performance tuning is the role of DBA. however, DBA does not have time to carefully check every change made to the stored procedure. so learning some basic tuning may help you save the effort of rewriting.CodeTime.I have listed 15 items here. When writing code

I usually don't pay much attention to database-related things. I feel good to see this article: Speed Up SQL Server Apps Learn 10 useful tips and tricks that help boost SQL Server application performance-and streamline development and deployment as well The following are 10 tips:1) Replace COUNT (*) With EXISTS When Checking for Existence2) Be Careful When U

AvaScript is now the most popular language. It can do many things-website interfaces, server terminals, games, operating systems, robots, and many more. But to be honest, even if JavaScript is so crazy, it is already the most popular language. It can do a lot of things-website interfaces, servers, games, operating systems, robots, and so on. But to be honest, even if it is so crazy, its performance has not reached its limit. Yes, it is improving, but

used to control the process.4. Use local variables as much as possibleLocal variables, the parameters passed when the method is called, and the creation of temporary variables are saved in the stack (stack), faster, other variables into static variables, global variables are created in the heap (heap), slower.Extension: The stack is allocated by the system, faster, the stack uses a first-level cache, they are usually transferred to the storage space, the call is immediately released, the heap i

Column it here first, and sort it out when you are free. Crawling large lists in SharePoint 2007 Http://blogs.msdn.com/joshuag/archive/2009/10/05/crawling-large-lists-in-sharepoint-2007.aspx SharePoint indexing Performance Tuning tips Http://sharepointsearch.com/cs/blogs/notorioustech/archive/2009/03/06/sharepoint-indexing-performance-tips.aspx Estimate

the data processing to the SSAS Cube Dimension (also disk files), again generate unequal disk overhead, in addition to distinct to recalculate, the former need to the membership dimension of this large table to do tier to heavy, the latter only need to the membership level this small dictionary table to do the heavy, obviously the calculation is different weight class, These are just the cost of the process, perhaps you are doing in the night, not care these, then the

Closure (closure) is also a very common coding pattern, because it implicitly carries context variables, so that the algorithm code can be more concise.But behind any "convenience" and "elegance" is often a more complex implementation mechanism, which is nothing more than a syntax sugar or compiler that hides the details. Ultimately, these will become additional costs at run time by CPU, runtime burden. Even for unreasonable use, causing performance p

web| Program | skills | performance | skills | Performance This article discusses: Common myths about ASP.net performance Useful asp.net performance tips and tricks Some suggestions for processing databases in asp.net Buffering and using ASP.net for background processing Thi

Six tips for parsing MySQL database performance optimization bitsCN.com database tables have indexing and error prevention mechanisms on the surface. However, a simple query takes a long time. Web applications may run well in the development environment, but are equally bad in the product environment. If you are a database administrator, you may have encountered the above situation at a certain stage. There

Six tips for MySQL database performance optimization: bitsCN.com On the surface of the database table, there is an index and error prevention mechanism. However, a simple query takes a long time. Web applications may run well in the development environment, but are equally bad in the product environment. If you are a database administrator, you may have encountered the above situation at a certain stage.

Website performance is a key factor for any successful website. Today, WordPress is becoming more popular than ever before. The 11 tips mentioned here to improve WordPress speed and performance may be useful to you. 1. Install the DB cache plug-in The DB cache plug-in can cache each database query for a lifetime. Its advantage is that the speed is far higher than

According to some tips on the official website, following these steps can improve the performance of struts2. Because struts2 inherits webwork, so webwork is the same. 1. Disable Logging and devmode. devmode is set in struts. properties. To Disable Logging, modify the Web. xml file and add the following parameters. 2. Do not use interceptor unless necessary ). 3. correctly set cache-control and expires

Article Title: tips for using high-performance dual-effect firewall for LINUX. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. 　　 Working on Windows Many users use both Linux and Windows, although many users only want to play games. There are three ways to run Linux and

(); } return Convertview;} Static class Viewholder { TextView text; ImageView icon;}3. Optimize the layout file, prevent the level nesting too deep, preferably not more than 5 layers(1) Tools to use the viewing layout: Hierarchy Viewer(2) Using the Layout optimization tool: layoutopt4. Optimize Activity Background MapFirst of all we need to know that in Android activity, there are not only the view that you use when you use Setcontentview, but also some other view.The root view is a

Here are some tips I've summed up, just for reference. The following code is basically in the jquery source can be seen, if the wrong place, please point out. Use the source method as much as possible JavaScript is an explanatory language and is slower to execute than a compiled language. The way the browser has been implemented, don't go through it again. In addition, the browser has implemented a number of methods in the algorithm has done a lot

This article discusses JavaScript performance optimization. Firefox has the fastest JavaScript parser SpiderMonkey, with a variety of efforts to make JavaScript faster, one of which is asm.js. Asm.js is a subset of JavaScript that is produced by Emscripten, which makes a lot of optimizations for the JavaScript code that is compiled by C/s + +, which is hard to look at after compiling code, which is why you can't write the optimized code yourself, but

, and also prevents the MVCC cleanup process from reclaiming old tuples or index entries that are no longer needed.Submission Date/time not that easyThere are two very complicated things in programming:Processing encodingWorking with dates/times across multiple time zonesTo solve the second problem, it is a good idea to save all timestamps in the UTC time zone. However, when using MySQL, you also need to set the Uselegacydatetimecode JDBC driver configuration property to False.ConclusionAs you c