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MySQL performance tuning and Architecture Design-Chapter 1 Data splitting of scalability design and mysql Optimization Chapter 1 Data splitting for scalable design Preface The expansion implemented through the MySQL Replication function is always limited by the size of the database. Once the database is too large, especially when writing too frequently, it is difficult to support it by a host, we are still faced with expansion bottlenecks. At this time, we must seek other technical means to solv

readers pay the most attention to the shortcomings of the study, which is unavoidable in all medical research. Once the editors and readers discover the shortcomings of the study, and the authors have not discussed them, their trust in the article will be shaken and suspicious: are there other weaknesses that they and the authors have not found? Secondly, the study is linked to previous work and does not

Private * @var resource-read/write semaphore */private $resource; /** * @access Private * @var int */Private $writers = 0; /** * @access Private * @var int */Private $readers = 0; /** * Default Constructor * * Initialize the read/write semaphore * * Public Function __construct () {$mutex _k EY = Ftok ('/home/cyrus/development/php/sysvipc/rw_semaphore.php ', ' m '); $resource _key = Ftok ('/home/cyrus/development/php/sysvipc/rw_semaphore.p

: default permission 0666 $ auto_release: whether to automatically release the Semaphore */$ sem_id = sem_get ($ key); # obtain the signal sem_acquire ($ seg_id ); // do something here is an atomic operation // release The semaphores sem_release ($ seg_id); // remove sem_remove ($ sem_id) from the system ); // possible problems $ fp = sem_get (fileinode (_ DIR _), 100); sem_acquire ($ fp ); $ fp2 = sem_get (fileinode (_ DIR _), 1); sem_acquire ($ fp2 ); Implementation of a read-write semaphore

It is hard to imagine which computer technology people have not read the book, if only to see the technical paste on the Internet, so that the knowledge is absolutely discrete, not systematic. And to really learn a learning (such as a computer language or a technology), the role of a good book is self-evident. Many people complain that the Chinese in technical books copied to copy, superficial understanding, although the publication of books, but eventually become a boutique is rare. As a result

. Why do you want to write this book? (Why)An important step in personal management is to first find out the real purpose behind doing things. Writing a book is no exception, and check your own motivation for writing a book. What are the main objectives and objectives? Is it for money, or to raise awareness or create opportunities for yourself?I wrote the first book to help my friends. I wrote two SQL Server books to another friend, but I didn't write any more since I found that if I want

wrote a blog on csdn for nearly six years. A year and a half ago, I established a Google groups (toplanguage). Because the readers of my blog have a common language, therefore, this group was very popular at the beginning, and high-quality technical discussions further attracted more cool people to participate. After the snowball rolled up, it was very difficult to stop, nearly a year and a half, I have benefited a lot from this group discussion [1].

Currently, RSS readers can be classified into three types. First, most readers are applications running on the desktop of computers.ProgramThe news title of the subscribed website can be updated automatically and periodically. Among these readers, awasu, feeddemon, and rssreader are available in free trial and paid pro versions. Recently, several RSS

our website. It clearly tells readers the central idea you have written and slightly modifies your title, it is enough to attract readers, but it must be true.2. Word count control: Word count control is one of the requirements of titles. You must ensure that the search engine can be indexed and that the snapshots displayed in the indexed snapshots can be fully displayed with our titles, this is because th

http://blog.csdn.net/innost/article/details/9008691Authorized by the author, published Tieto a young cow of a "programmer" masterpiece.Introduction to the Android System Performance tuning toolIn the software development process, presumably many readers have encountered the system performance problem. Several major steps to solve the system performance problem are: Evaluation: A large number of targeted testing system to obtain the appropriat

Android provides a user-level lightweight LOG Mechanism. Its implementation runs through Java, JNI, local c/c ++ implementation, Linux kernel driver, and Other Android layers, and is simple and clear enough, it is a pretty good case. This series of articles explains the internal implementation mechanism of the LOG mechanism. This article is part 4 of the series. It explains the implementation of the device-driven Logger in the Linux kernel. Logger is a MISC Driver written by Android for Linux. I

MySQL performance tuning and Architecture Design-the idea and solution of the High Availability design in Chapter 17th, mysql Tuning Chapter 1 High Availability design ideas and solutions Preface: The database system is the core part of an application system. To ensure the overall availability of the system, the database system cannot have any problems. For an enterprise-level system, the availability of the database system is particularly important. Once a database system encounters a problem a

Transfer from http://blog.csdn.net/zoudaokou2006/article/details/3966694The reader-writer problem is a classic process synchronization problem that is implemented with semaphores. In the system, a data set (such as a file or record) is shared by several concurrent processes, which are divided into two categories, one of which requires only re-operation, called "Reader", and the other requires write or modify operations, which we call "writer".In general, for a data set, in order to ensure the in

The vast number of readers friends of all good, very happy and can be in the blog and everyone to share my development experience.This time, I am going to introduce you to a very useful jquery form plugin--jqgrid.If you are experiencing the need for web-side tabular display functionality in a real-world project, and you don't know exactly which technology to use, Jqgrid is definitely your choice.If you have decided to use Jqgrid technology to complete

ASP. NET MVC is a Web development framework built on an ASP. NET platform based on the MVC pattern, which provides a completely different approach to Web form development. The ASP. NET Web Form, drawing on the programming patterns of Windows Form based on control and event registration, makes WEB application development simple and fast, but it makes the nature of the developer and the Web far more gradual. ASP. NET MVC is a regression that enables developers to really program for the web, and we

JavaScript Reference Tutorials This tutorial provides a more complete primer for readers who are not exposed to JavaScript, but is limited to the basics: all JavaScript closely related to dynamic Web pages is not mentioned in this tutorial, including dynamic positioning, animating, and getting documents to receive more events ( Document.captureevent ()); All of the different JavaScript in IE and Netscape are rarely mentioned. The structure of this t

JavaScript Reference Tutorials This tutorial provides a more complete primer for readers who are not exposed to JavaScript, but is limited to the basics: all JavaScript closely related to dynamic Web pages is not mentioned in this tutorial, including dynamic positioning, animating, and getting documents to receive more events ( Document.captureevent ()); All of the different JavaScript in IE and Netscape are rarely mentioned. The structure of this tut

evolved from primitive mollusks, the earth experienced an evolutionary explosion that produced and perished at an unprecedented rate. "Unusually dangerous," Bezos concludes, "is not evolving." 」"Evolution" is not just a theory for Amazon, but a blend of tissue blood. Since July 1995, the advent of a "single cell" online bookseller, Amazon has grown into a giant online mall in its 14-year history, offering millions of goods and gaining more than $34 billion trillion in market capitalisation. It

data model, and to lower the standard of normalization into the design of the physical data model. Lowering the paradigm is adding fields, allowing redundancy. be good at identifying and correctly dealing with many-to-many relationshipsThis relationship should be eliminated if there is a many-to-many relationship between the two entities. The solution is to add a third entity between the two. In this way, the original a many-to-many relationship, now becomes two one-to-many relationship. To pro

Turing Small series "for a long time not in the blog activities ~ Small series accumulated a lot of good newsletter can't wait to recommend to everyone, now from the algorithm book start bar ~ actually Turing algorithm book not much, but each has a characteristic, by readers welcome, today said 8, plus 1 of the takeaway ~"Get started first book, you will be able to readThere is no dull description, no hard-to-understand formula, everything is based on