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Tags: partial kernel software detailed storage System database query system cache system processThe purpose of 1.Linux performance analysis1) Identify system performance bottlenecks (including hardware bottlenecks and software bottlenecks);2) provide a performance-optimized solution (upgrade the hardware?) Improve syst
Performance comparison of Php+mysql prepare and normal query The instance code is as follows: Run Result: Normal MySQL run 1000 data time: 0.011621 seconds Normal MySQL Run 10,000 data time: 0.07766891 seconds Normal MySQL
measurement results before and after modification. However, for effective comparison, only one setting should be modified each time, and then appropriate indicators should be compared to determine the effect of the modification. The reason for modifying only one setting at a time should be obvious: the two modifications made at the same time may affect each other. The indicators used for comparison are more subtle.The selected indicator must reflect the response that the Application User feels.
. GC Tuning target has three basic ideas: Reduce GC frequency, can increase the heap space, reduce unnecessary object generation, reduce GC pause time, can be achieved by reducing heap space, using the CMS GC algorithm, avoid full GC, adjust the CMS trigger scale, avoid Promotion Failur E and Concurrent mode failure (the older generation allocates more space, increases the number of GC threads to recover faster), reduces large object generation, and s
This article describes how to use some simple tools to analyze some data related to site performance. In the previous article, we discussed the general process of performance tuning, this article introduces some methods and tools to help you get started quickly. The topics in this chapter are as follows: General performanc
A graduation on the contact optimization problems, professional optimization also has at least 5 years of time, but now still often hear many people think that optimization is very simple, is to build index problem, it really can not blame everyone, do this line for more than 20 years, at every stage of career, almost can hear such a voice, In many books have also seen such a statement, but here I want to tell you: optimization is not just index, optimization is not very simple thing, this job r
applications that need to perform many I/O operations, such as file servers, databases, and interactive shells, which expect smaller response times. They are limited by the I/O subsystem or network resources. for CPU-intensive workloads , you can check and count the code for CPU operations, and for I/o-intensive workloads , you can check and count the code that performs the most I/O operations. This allows for more targeted tuning. You can also use t
DB2forIBMi provides a series of performance tuning tools. VisualExplain is an important one. It graphically displays the access plan generated after the DB2fori database query engine intelligently optimizes Users' Query requests. DB2 for IBM I provides a series of performance
Maybe many of you who use the mysql database do not know the following three methods can fly your mysql. Next I will introduce you to several tuning techniques of the mysql server, for more information, see. MySQL OptimizationThere are three ways to speed up the running of t
strong support for the application performance diagnosis.Back to top of pagePerformance optimization PracticesAfter introducing some of the commonly used performance diagnostic tools, here are some examples from the JVM layer, the application code layer, and the database tier, combined with our practice in Java application tuning.JVM Tuning: GC PainSogou Commerc
Without the idea of design, you cannot become an architect. The architect is a good piece of code, drawing a beautiful uml/prototype, wrote a technical document, more to solve the project key technology of the comprehensive talent. Architect = Front-end engineer + back-end Programmer + System Analyst + Key Technology Solutions + various technology collocation + design mode + deployment tuning + other, visible architects are generalists, and play a key
. Performance monitoring technology can be roughly divided into two categories: the technology used when fault-related knowledge is known and the technology used to locate the fault (or find whether a fault exists. If you find some problems with this fault, you can obtain more information in this regard. Therefore, starting with 2nd technologies that help precisely locate the fault area, we will discuss how to conduct more detailed analysis. When
that will cause underlying performance problems. On the other hand, interacting with users may impede your work progress. Success also results in exposure of the next layer of performance problems. What do users cannot tell you? The bottom-up method of a user reveals that a single package consumes about 25% of the input and output resources. For another user, a single
=semisync_slave.so"rpl-semi-sync-master-enabled = 1rpl-semi-sync-slave-enabled = 1 server_id=51Log-bin=master51binlog-format= "Mixed": Wq [Email protected]~]# systemctl Restart Mysqld [Email protected] ~]# ls/var/lib/mysql/master51.*/var/lib/mysql/master51.000001/var/lib/mysql/master51.index [Email protected] ~]# mysql
Tags: function performanceAbstract: Reproduced from Xiaorui some users (especially the external output) when using Maxcompute (original ODPs), due to the use of the product level and the level of understanding of the implementation of different degrees, resulting in the implementation of the task is too long, the occupation of more cluster resources; serious causes failure, Not only need to input support students to help solve the problem, but also affect the user's normal business. Consolidatio
. When a query is executed, SQL Server does not read more or less data than is actually required, so when executing the same query on the same dataset, the resulting logical read numbers are always the same.Why is it important to know the logical read value of SQL Server when executing queries in tuning query
MySQL is a powerful open-source database. With more and more database-driven applications, people have been pushing MySQL to its limits. Here are 101 tips for adjusting and optimizing MySQL installation. Some of the techniques are specific to the installation environment, but these ideas are generic. I've divided them into several categories to help you master mo
This article mainly describes how to locate the performance problems of the Site Based on some simple tools and Simple phenomena. The topics in this chapter are as follows: General performance tuning process Analyze page loading information using analysis tools Analyze performance bottlenecks using analysis tools
MySQL is a powerful open-source database. With more and more database-driven applications, people have been pushing MySQL to its limits. Here are 101 tips for adjusting and optimizing MySQL installation. Some of the techniques are specific to the installation environment, but these ideas are generic. I've divided them into several categories to help you master mo
MySQL is a powerful open source database. With more and more database-driven applications, people have been pushing MySQL to its limits. Here are 101 tips for adjusting and optimizing MySQL installation. Some of the tricks are specific to the installation environment, but these ideas are generic. I've divided them into several categories to help you learn more ab
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