opendns issues

Multithreaded programming also brings some security issues while improving program performance, producing unpredictable results. The reason for this is that the sequence of operations in each thread in multiple threads is unpredictable, and the resource operations shared by each thread are likely to interact with each other. For example, statistics on the number of accesses to a page, the value of an int type is accumulated, each thread accepts the us

H5 page window automatically adjusts to device width and prevents users from zooming the page(The UC browser of some Android phones can be zoomed out after writing)ignore numbers in a page as phone numbersignore the recognition of email addresses in the Android platformViewport TemplatesWebKit How the default appearance of form elements is reset. Css{-webkit-appearance:none;} (the drop-down box on iOS will have rounded corners, so write border-radius:0)the text is emptied when the input box has

machine service will be full, so how to fully utilize the processing capacity of a single machine? Connection migration This kernel technology allows a server to simply handle TCP connection problems without being responsible for the business, thereby greatly improving the QPS of a single machine.Security issues with TCPThere are many security issues for the TCP protocol itself. For example, the agreement

Java multithreaded programming, there are many thread security issues, as to what is thread safety, it is difficult to give an easy-to-understand concept, as in the Java Concurrency programming practice, said:WroteStatic variable: thread is not secure.A static variable is a class variable, located in the method area, shared for all objects, shares a portion of memory, and once the static variable is modified, the other objects are visible to the modif

avoid the management of too many data sources, fully utilize the resources of each database server, you can consider the business close, and two or more shard with similar data growth rates (the amount of primary table data on the same order of magnitude) are placed in the same data source, each shard is still independent, they have their own primary table, and they hash with their primary table ID, except that their hash modulo (that is, the number of nodes) must be consistent. Common Sub-Lib

About thread safety issuesRedis is actually a thread-gated concept that encloses a task in a thread, naturally avoiding thread-safety issues, but for composite operations that rely on multiple redis operations, locks are still required and may be distributed.What are the benefits of using Redis? Fast because the data exists in memory, and the advantage of Hashmap,hashmap is that the time complexity of finding and Operating is O (1) Suppo

Organize some PHP development security issues PHP gives developers a great deal of flexibility, but this also poses a potential risk to security issues, the recent need to summarize the past problems, here to lend a translation of an article at the same time with their own development of some feelings summed up. Brief introduction When developing an Internet service, you must always keep in mind t

1. Document.form.item Issues (1) Existing problems: There are many Document.formName.item ("itemname") statements in existing code that cannot be run under Firefox (Firefox) (2) Workaround: Use document.formname.elements["ElementName"] 2. Collection Class object issues (1) Existing problems: Many collection class objects in existing code use (), IE can accept, Firefox (Firefox) cannot. (2) Workaround: Inst

CSS multi-browser compatibility issues and solutionsFirst, Document.formName.item ("itemname") problem Problem description: Under IE, you can use Document.formName.item ("ItemName") or document.formName.elements ["ElementName"];firefox, Use only document.formname.elements["ElementName"].Workaround: Use document.formname.elements["elementname" uniformly.The problem of the collection class objectProblem description: Under IE, you can use () or [] get th

There are 8 major security issues for SaaS, which are explained in all directions below. Before that, let's talk about reimbursement management software, I believe many people know very little about it. What is reimbursement management software? The so-called reimbursement management software, from the name can be well understood, this is used for reimbursement management software. 8 Security issues with Sa

SQLite is a small relational database built into Android. Sqliteopenhelper is an abstract class that is used to assist in managing database creation and version escalation issues. We can inherit this abstract class and implement some of its methods to customize the operation of the database. The following two methods must be overridden: public void OnCreate (Sqlitedatabase db) public void Onupgrade (sqlitedatabase db, int oldversion, int

This article will briefly explain some difficult issues related to SQL database conversion. You can make a reference in practical use ...... Possible causes: ◆ the source database or target database is SQLServer6.5. The current SQL Server connecting to the Access Project and the target server to convert the database to must be SQLSe This article will briefly explain some difficult issues related to SQL data

, not finished, and another is involved in executing。The error that caused the shared data.WORKAROUND: A statement that shares data on multiple operations can only be performed by one thread, and no other threads can participate in the execution. Java for multi-threaded security issues, provides a professional solution, is to synchronize the code block.Synchronous code block format:SynchronizedObject 1{The code that needs to be synchronized}The object

Because the company project requirements are compatible to IE6, which encountered a lot of CSS compatibility issues, so in the blog summary down, later in the project encountered new compatibility issues, will also be updated here.1.ie6 the Height property is invalidatedproblem Description: under IE6, even if the block level element is set to a height, but if the content inside the element exceeds the set h

Python version in CentOS7 is python2.7.5, there are two issues to be aware of when upgrading to the latest version of Python The new version of Python is installed to modify the Python system by default pointing to the problem Yum error issues after upgrading to the latest version of Python The following is a description of the new installation steps.　First, download and install the latest

When developing an Internet service, you must always keep in mind the concept of security and be in the Code of development. The PHP scripting language does not care about security issues, especially for most inexperienced developers. Whenever you talk about transactions such as money issues, you need to pay particular attention to security considerations, such as developing a forum or a shopping cart.Gener

Problem: nginx/fpm/php all PHP files say ' File not found. ' Resolution: Possible Scenario 1:In the Nginx php-fpm configuration problem (1), we analyze a possible cause, in this article, weAnalyze another scenario that could lead to this problem.In nginx.conf I configured the user and group information for, (according to my own machine situation configuration, here does not consider security issues, I configured for my usual use of the user name and u

Summary of 40 Java multithreading issues and 40 Java Multithreading Preface I personally think that the more you learn, the more complicated and complex the knowledge, the more you need to make a profound summary so that you can remember deeply and turn your knowledge into your own. This article mainly summarizes the problem of multithreading, so it lists the problem of 40 multithreading.Some of these multithreading problems come from major websites a

Transaction isolation issues in Hibernate (dirty reads, non-repeated reads, Phantom reads), hibernate transactionsTransaction isolation issues in Hibernate (dirty reads, non-repeated reads, Phantom reads)1. Features of transactions Four features of transactions: 1) atomicity: transactions are the smallest unit for database operations.Operations that constitute transactions are inseparable 2) Consistency: Al

, but Libtool command line is too complex, and Apple has modified its parameters, so that I would like to follow the gourd to add a patch after the build is complete. is about to give up the occasion, found that GCC has a install_name option. The Dead Horse is a live horse medicine, try. The result is no problem. Modify the properties of the project--C + + Build-Settings MacOS X C + + linker->miscellaneous, plus-install_name @executable_p The Ath/aaa.dylib parameter, so that the generated dynami