Tag：Utilization Rate
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Time：2021-6-3
Why is redis so fast? Conclusion there are three points, as we all know, here is mainly analysis. First of all, the first point Redis is memory access, so it’s fast Of course, we all know this, so it’s not the point IO intensive and CPU intensive Generally, we divide the task into two […]
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Time：2021-4-29
Introduction:Monitoring best practice redis and business interface 1. Background 1.1 problems On December 4, 2020, the CPU of db0 monitored by redis cluster version on the client side suddenly increased to 100%, resulting in the failure of normal service of the database. After investigation, there was a big key of about 2m on the client […]
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Time：2021-4-18
In this series, we will discuss Linux performance measurement and how to measure it correctly. Linux performance is a very broad topic, so we will focus on the four main resources that usually improve system performance — CPU, memory, disk storage and network. Now, when we talk about component related performance, many scenarios just need […]
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Time：2021-3-20
Active session history (ash) view and real table are valuable tuning tools provided by ORALCE database. Ash provides two fine-grained Views:V$ACTIVE_SESSION_HISTORYandDBA_HIST_ACTIVE_SESS_HISTORY。V$ACTIVE_SESSION_HISTORYIs a dynamic view sampled once a second,DBA_HIST_ACTIVE_SESS_HISTORYIs 10 seconds 1 sampling, stored in the real table (WRH)$_ ACTIVE_ SESSION_ Activity session history data in history. For the sampling logic and associated process of ash […]
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Time：2021-3-6
If a large number of logs are written or a large file occupies the disk, the application will crash. For this problem, we can use a simple shell to realize the function of e-mail reminder when the disk utilization rate is close to the threshold. Environmental Science Ubuntu 16.04 mail serve Install heirloom mailx sudo […]
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Time：2021-2-5
In project development, if there is a business requirement of timing task, we will use crontab of Linux to solve it, but its minimum granularity is minute level. If the granularity is second level, or even millisecond level, crontab can’t meet it. Fortunately, the powerful millisecond timer provided by spool. Examples of application scenarios We […]
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Time：2021-2-3
Through this article, you can get the following points: How to configure large state in Flink? What are the common load balancing strategies? Flink source code in the selection of rocksdb state disk, the existing problems. Some solutions are proposed, and the advantages and disadvantages of each solution are analyzed. 1、 Why optimize? (optimization background) […]
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Time：2021-1-27
Today, I’d like to talk about the memory management of SQL server,How does SQL server use memory?Only after we know how to use it can we talk about how to manage it. In short,SQL Server database memory use principle is how much memory will occupy how much memory, will not automatically release memory. The reason […]
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Time：2021-1-15
Share basisLinux performance optimizationNotes of course pictures. preface Experimental environment: Ubuntu 18.04, switch to the root authority operation To view the detailed usage of the command, you can:man xxxWhen it comes to paths, you can generallycat /x/xx/xxxWhen it comes to tools, if they are not installed, you can:apt-get install xxx CPU CPU performance index Find […]
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Time：2021-1-14
Nethogs is an open sourcecommandLine tool (similar toLinuxTop ofcommand）, which is used to count the network bandwidth utilization rate in real time by process or program. Environmental Science:CentOS Linux release 7.4.1708 (Core)ip：172.16.1.16 install Install dependency package [[email protected] ~]# yum install libpcap libpcap-devel epel-release -y Install EPEL source [[email protected] ~]# yum install epel-release -y Install nethogs […]
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Time：2020-11-29
Background:The game project adopts agile development, version development iteration is very fast, basic 1-2 weekly version Necessity of performance test Number of performance issues in phases throughout the project Performance problems do not occur at the beginning or suddenly appear one day, but accumulate with our development progress;Later, we hope to solve problems for months […]
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Time：2020-10-31
preface: This article will write a shell script to queryUtilization rate of CPU, memory and disk partition of Linux serverShell script is actually composed of basic shell commands, so when writing shell scripts, you need to know the commonly used commands. If you are not very clear, you can refer to this article: Linux learning […]
