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Reference article:Http://ourmysql.com/archives/1359?utm_source=tuicoolutm_medium=referralOfficial: Https://github.com/box/AnemometerSingle-node anemometer monitoring1 Installing Anemometer# cd/data/www/web3# git clone https://github.com/box/Anemometer.gitanemometer CD anemometer2 Creating tables and user names# mysql-uroot-proot We can look at the following table structure as follows650) this.width=650; "src=" Http://s4.51cto.com/wyfs02/M01/82/C2/wKioL1dgsumQ5XJvAABppErvjtI393.png "style=" floa
Percona utility-Introduction to pt-kill, perconapt-kill Pt-kill is an excellent tool for kill MySQL connection and is part of percona toolkit, when the maximum number of connections is exceeded due to a large number of idle connections and a problematic SQL statement causes a high mysql load, you must kill some connections. This tool is mainly used for this purpose. This tool is highly practical at work to
Pt-pmp, mysqlptpmp Pt-pmp has two functions: Obtain the stack information of a process, and summarize the stack information. The stack information of a process is obtained using gdb. Therefore, the performance of the mysql server may be affected during the process. In official words: This will freeze the program for some period of time, ranging from a second or so to much longer on very busy systems with a
When you modify a schema by using the Pt-online-schema-change tool, a new table with the same structure as the original data table is created, and the data from the original table is progressively copied to the new table.For example, a ZS table with Id,name data columns, when adding a new column named UID to the table, use the following command:Root@localhost: Mysql3316.sock -: -: - [Test]>ShowCreate TableZs\g*************************** 1. Row********
First understand the basic concept: PX is to represent pixel, pixels, is the screen to display the most basic points of data, and PT is point, is the printing industry commonly used units, equal to 1/72 inches. In the web design CSS, often used fonts, and font size set units, commonly used in 2 kinds: px, pt. What's the difference between these two?First understand the basic concept: PX is to represent pixe
Tags: style blog http io os using AR strong forConsistency checking of master-slave data is a headache, and occasionally it is frustrating to be inconsistent with the master-slave data from a business complaint, or a few inconsistencies between the data from the library. Usually we only have one way to hot-spare the main library and then replace all the slave libraries. This is not only very costly, but also similar to the solution of a cure, it is very disturbing. So we need the right tools, at
0x00 background PT is the abbreviation of PrivateTracker (Private seed server). It can collect statistics on user uploads and downloads. User Sharing rate. You can simply understand it as an upgraded version of BT. Only when the shared rate is set can the account not be deleted. PT is actually a type of Bt download, but there are two obvious improvements: first, private Secret for small-scale download. Seco
Introduction when the MySQL server has a short (5-30 seconds) performance fluctuations, the general performance monitoring tools are difficult to grasp the fault site, it is difficult to collect the corresponding more granular diagnostic information. In addition, if the frequency of such fluctuations is very low, such as in a few days, we are also difficult to artificially seize the scene, collect data. This is the problem that Pt-stalk solves.Paramet
It is said that the Pt-online-schema-change in the Pt-toolkit toolset can modify the table structure on-line without locking the table, so what is the specific principle of this tool, please see below to explain:Restrictions on the use of 1.pt-online-schema-change tools:1) If the modified table has a foreign key, the tool will not execute unless a specific value
In CSS style sheets, we often see such units of length such as PT, Px,em,ex,in, and so on. What do they mean, what's the difference?In CSS style sheets, the length units are divided into two types: Relative length units, such as PX, EM, etc. Absolute length units, such as PT,MM, etc. also talk about the difference between PX and PTOften see the PX and
Pt-kill is a good kill MySQL connection tool, is a part of Percona Toolkit, in the due to more idle connections cause more than the maximum number of connections, a problem of SQL causes MySQL load is high, you need to kill some connections, This tool is mainly used for this purpose. Obtain a connection that satisfies the condition from show processlist or read the connection that satisfies the condition from the file containing show processlist and
Tags: pt-slave-delay mysql######################################################################### # # # # # MySQL installation initialization # # #########################################################################Slightly######################################################################### # # on three servers to build a master-slave environment (VM_WEB1-based, VM_WEB2 and VM_MYSQL1 from) # # ###############################################
One of the most confusing aspects of CSS styling is the Font-size property of the text extension in your application. In CSS, you can display the size of text in a Web browser in four different units of measure.Which of the four units is best for the Web? The problem aroused a wide controversy. It is difficult to find a definite answer, because it is so difficult to answer on its own.Contact these units1. "Ems" (EM): "em" is a scalable unit for Web document Media presentation. An em equals the c
Recently, colleagues have reflected that in the process of monitoring the master-slave replication delay using pt-heartbeat, if master down, Pt-heartbeat will fail to connect, but will try again. It's understandable, after all, from the user's point of view, I hope pt-heartbeat can keep retrying until you reconnect to the database. However, they found that repea
One of the most confusing aspects of CSS styling is the Font-size property of the text extension in your application. In CSS, you can display the size of text in a Web browser in four different units of measure. Which of the four units is best for the Web? The problem aroused a wide controversy. It is difficult to find a definite answer, because it is so difficult to answer on its own.Contact these units1. "Ems" (EM): "em" is a scalable unit for Web document Media presentation. An em equals the
HTML PX EM pt unit AreaFirst, PX\EM\PT unit introductionpx unit name is pixel , relative length unit, pixel (px) is a domestic recommendation relative to the display screen resolution;The EM unit name is the relative length unit . Compared with the text in the current object font size, foreign use more;The PT unit name is Point, and the absolute length unit is ge
[SSO single-point series] (6): CAS4.0 single-point process Sequence Diagram (Chinese version) and related terminology (TGT, ST, PGT, PT, PGTIOU), tgtpgt CAS-related content has not been written for a long time. It may be updated next week. Since the single-point process sequence diagram in the previous article was directly downloaded from the official website, it was in English and may not be understood by some friends, so it was changed to Chinese.
Recently asked by a friend: CSS set a DOM height:65px, is the height of the display and Android 65DP elements such as high? The brain flashed a bunch of concepts, such as DPR,PPI,DP,PT, but thought for a while, paste, so re-combed the relevant knowledge, in case of a rainy day.1.ppiThe PPI refers to pixels per inch, which is the pixel point of the pixel, where the pixels are the physical pixels (i.e. the smallest display unit). The PPI describes the p
MySQL online modify table structure Pt-oscIt is known that MySQL is more expensive than the DDL operation. Because MySQL blocks any read and write operations while modifying the table.Basically the business is paralyzed. This is not tolerated if the volume of data is large and may take several hours to complete. Percona developed a series of Tools Percona Toolkit package, which has a tool pt-online-schema-c
One of the most confusing aspects of CSS styling is the Font-size property of the text extension in your application. In CSS, you can display the size of text in a Web browser in four different units of measure. Which of the four units is best for the Web? The problem aroused a wide controversy. It is difficult to find a definite answer, because it is so difficult to answer on its own. Contact these units 1. "Ems" (EM): "em" is a scalable unit for Web document Media presentation. An em equals t
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