disk access

Tip One, minimizing disk access to memory access is much faster than disk access. So the essence of using optimization is to reduce access to the disk as much as possible.Memory is read 1 million times times faster than disk speed. It takes a long

When writing query statements, be sure to pay attention to performance issues.Here are some of the methods I collected to raise the performance, not the whole point of looking at a lot of advice.　　1. To optimize the query, it is important to avoid

PostgreSQL Hardware Performance Tuning Translated from the article "PostgreSQL Hardware performance Tuning" PostgreSQL is an object-relational database developed by developers all over the world on the Internet. She is an open source

Article Title: ubuntu migration: from virtual disk to real partition. 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

In CentOS4.4, use mdadm to create Raid5 -- Linux Enterprise Application-Linux server application information. The following is a detailed description. I. Environment 1. The operating system is CentOS4.4, And the mdadm software is provided by the

Internet access in Internet cafes is subject to too many restrictions. If you want to delete your chat records but cannot open the hard disk, you want to receive MM photos but are forbidden. After downloading a tool and starting it, you will be

Article Title: Linuxgrub system startup configuration file. 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

RxJava methodFilter relatedRxjava provides the filter () method to filter unwanted values in our observation sequence.When we don't need the whole sequence, we just want to take a few elements at the beginning or the end, we can use take () or

View all CPU load commands in LINUX $ vmstatprocs ----------- memory ---------- --- swap -- ----- io ---- system -- ----- cpu ------ r B swpd free buff cache si so bi bo in cs us sy id wa st 1 4 329796 26040 4528 3379824 1 1 50 160 36 17 2 10 85 3 0

TOP command and Parameter Parsing Top Command is a common system performance analysis tool in linux. It can display the resource usage of various processes in the system in real time, similar to the windows Task Manager. The following describes how

ForJ2EEWe know that when developing an application, the decision in the architecture design phase will have a profound impact on the application performance and scalability. Now, when developing an application project, we are increasingly concerned

14 skills for high-performance Java persistence, high-performance java A high-performance data access layer requires a lot of knowledge about the database, JDBC, JPA, and Hibernate. This article summarizes some important technologies that can be

EfficiencyI suspect that some people do a secret Pavlov experiment with C + + software developers, or why many programmers drool when it comes to the word "efficiency". (Scott Meyers is a true humor translator)In fact, efficiency is not a matter of

The following is transferred from: http://blog.csdn.net/oscar999/article/details/7918385---------------------------Split Line--------------------------------------First, briefcan be used to monitor CPU usage, memory usage, hard disk read and write

Blkid is used to view the unique identifier UUID and file system of the hard disk. when the file system is not specified during mounting, the system will automatically use blkid to detect the file system used by the partition to be mounted. Mke2fs-b

The word "change" is nothing more common for the IT industry. If the management supervisor asks you for a database recommendation list today, it is very likely that the project on your recommendation list will be outdated before you start to execute

Vmstat output in Linux: Vmstatprocs ----------- memory --------------- swap ------- io ------ system ------ cpu ---- rbswpdfreebuffcachesisobiboincsussyidwa001001522... explain vmstat output in Linux: vmstatprocs ----------- memory ---------- ---

One of the advantages of PHP is that it is fast. it is enough for general website applications. However, if the site's traffic is high, bandwidth is narrow, or other factors cause a performance bottleneck on the server, you may have to think of

One of the biggest advantages of PHP is its speed. In general, PHP always has enough speed to support dynamic generation of Web content. in many cases, you cannot even find a faster method than it. However, when you have to deal with huge traffic

PHP application speed-up overview. One of the biggest advantages of PHP is its speed. In general, PHP always has enough speed to support dynamic generation of Web content. in many cases, you cannot even find a faster method than PHP. one of the