pt hub

Percona-toolkit-2.2.8-1.noarch.rpm has two tools to verify MySQL master-slave Data Consistency Percona-toolkit-2.2.8-1.noarch.rpm has two tools to verify MySQL master-slave Data Consistency Percona-toolkit-2.2.8-1.noarch.rpm has two tools to verify MySQL master-slave Data Consistency Installing tookkit requires some dependent packages Yum install perl-DBI perl-DBD-MySQL perl-IO-Socket-SSL perl-Time-HiRes-y Lab Environment Initialize lab data on Master Create database mvbox; Use mvbox; Cr

1. Introduction to ToolsPt-query-digest is a tool for analyzing slow queries for MySQL, which analyzes Binlog, general log, Slowlog, It can also be analyzed using showprocesslist or MySQL protocol data crawled by tcpdump. The analysis results can be exported to a file, the analysis process is the parameters of the query statement, and then the parameterized query after the grouping statistics, statistics of the query execution time, frequency, percentage, etc., can be used to identify problems w

default font height for any browser is 16px. All non-adjustable browsers are compliant with: 1EM=16PX. So 12px=0.75em,10px=0.625em. To simplify the conversion of font-size, you need to declare font-size=62.5% in the body selector in the CSS, which makes the EM value 16px*62.5%=10px, so 12px=1.2em, 10px=1em, That means you just have to divide your original PX value by 10 and then put EM in as the unit. 1. The value of EM is not fixed; 2. Em inherits the font size of the parent eleme

Look at a lot of information has not been found to have a detailed introduction, including Apple official documents, is also a cursory. It was later seen in a blog that introduced the MacBook print font and was inspired.First, the length unit of the Apple device drawing can be thought of as point, not pound (PT). This point is a logical concept and is device-independent.Figure 1: Different resolution screen display 1pointFor traditional conventional s

Px: pixel, pixel, the smallest unit displayed on the screen, used for Webpage Design, intuitive and convenient;PT: point, a standard unit of length, 1pt = 1/72 inch, used in the printing industry, very easy to use;EM: %. In CSS, 1em = 100% is a ratio, which is used in combination with CSS inheritance relationships and is flexible.PPI (DPI): pixel (DOT) per inch, number of pixels (points) per inch, which is a rate, indicating "resolution" and "accuracy

Tags: Android HTTP Io ar OS use for SP strong Px, DP, dip, SP, In, mm, PT detailed analysis Px :( pixels): the pixels on the screen. Different devices have the same display effect. Generally, we use hvga to represent 320x480 pixels, which is usually used. Dip: (device independent pixels), device independent pixels. This is related to the hardware of the device. We recommend that you use this method to support wcga, hvga, and qvga, instead of pixels

Spanning Tree Protocol configuration for the Cisco PT Simulation Experiment (5) switchExperimental Purpose : Understanding how spanning Tree protocol works Mastering the Fast Spanning Tree protocol RSTP basic configuration method Experimental Background : The company's finance department and the sales department of the PC through 2 switches to achieve communication, in order to improve network reliability, redundant link is a good ide

CISCO PT Simulation Experiment (4) VLAN partitioning and configuration of switchesExperimental Purpose :Master The basic configuration of virtual LANs (VLANs);Master the configuration method of switch port VLAN and tag VLAN;Master the configuration method for VLAN trunking (VLAN trunk) and its Protocol (VTP).Experimental background : The company's finance department, sales department of the PC are placed in two offices , and through the indoor switc

CISCO PT Simulation Experiment (2) port configuration and management for switchesExperimental Purpose : Master the basic configuration and management of the switch, and understand the basic commands of the switch configuration.Experimental background : A company has a new batch of two-layer switch, before formally put into use to initialize the configuration and management, in order to maintain later.Technical Principle : There are two basic ways

Cisco PT Simulation Experiment (5) port aggregation configuration for switchesExperimental Purpose :Understanding Port Aggregation FundamentalsMaster the configuration method of general switch port aggregationExperimental Background : The company's finance department and the sales department of the PC through 2 switches to communicate frequently, in order to improve the bandwidth between links, to ensure the reliability of network communications, whil

Basic configuration and management of the Cisco PT Simulation Experiment (1) switchExperimental Purpose : Master the basic configuration and management of the switch, and understand the basic commands of the switch configuration. Experimental background : A company has a new batch of two-layer switch, before formally put into use to initialize the configuration and management, in order to maintain later.Technical Principle : There are two basic wa

Today do Web pages, need a 10pt font width is how much, think for a long time, incredibly will not calculate, check the data, finally calculated. By the way, the PT PS and DPI concepts are adjusted: PT: In typography, "point" is an absolute unit that is equal to 1/72 inches and can be measured by a ruler, in physical inches. PS: Our display is split into pixels, a single pixel can only have one color (f

effective, for other types is not necessarily oh. For example: decimal The advantage is that you need to lock the table only when the Copy table structure 2. Adopt Percona tool to deal with Execute a statement that modifies a table Mysql> ALTER TABLE test1 add column nickname varchar (a) default ';Query OK, 0 rows affected (12.33 sec)records:0 duplicates:0 warnings:0 Can see the operation time is still a little long, after all, I only have 1 million data, and the table structure is simple. For

Pt-duplicate-key-checker is also a very useful tool in Percona-toolkit to help you detect duplicate indexes or primary keys in a table. We know that indexes can be more useful than queries, but too much indexing can degrade the performance of the database, and this tool can help us find duplicate indexes and give you suggestions for deleting duplicate indexes. First look at the index structure of my table Mysql> show indexes from Curs; [SQL] View P

The pt novel system kills the version. Patch released officially! (Fuck !)Let's get started with the following text: Here is our own communication platform, a technology sharing platform for all our 90sec members!This set of program users do not use databases, and all user information is stored in the/data/user directory!Create a folder based on the user name and write user registration parameters and user information in the folder. 90sec-Web Informat

Look at a lot of information has not been found to have a detailed introduction, including Apple official documents, is also a cursory. It was later seen in a blog that introduced the MacBook print font and was inspired.First, the length unit of the Apple device drawing can be thought of as point, not pound (PT). This point is a logical concept and is device-independent.Figure 1: Different resolution screen display 1pointFor traditional conventional s

In-depth analysis on prototype of ctictipt:Is prototype attributes a copy, a reference, or a fixed search method? // What is the prototype principle of javasctipt? When an instance is created, it copies the prototype, obtains a copy of the prototype attribute, or enables the instance attribute to reference the prototype attribute value, Or when an instance is created, there are no properties with the same name as the prototype. Do you only rely on the fixed method of "querying the prototype" to

Comparison of pixel units dp, px, pt, and sp in androidDp (dip): device independent pixels (device independent pixel ). different devices have different display effects, which are related to the hardware of the device. We recommend that you use this function to support WVGA, HVGA, and QVGA without pixels. Px: pixels (pixels). Different devices have the same display effect. Generally, we use HVGA to represent 320x480 pixels, which is usually used.

1. Introduction to ToolsPt-query-digest is a tool for analyzing slow queries for MySQL, which analyzes Binlog, general log, Slowlog, It can also be analyzed using showprocesslist or MySQL protocol data crawled by tcpdump. The analysis results can be exported to a file, the analysis process is the parameters of the query statement, and then the parameterized query after the grouping statistics, statistics of the query execution time, frequency, percentage, etc., can be used to identify problems w

./pt-online-schema-change--user=root--password=root456--recursion-method= "Processlist"--chunk-size=50000-- alter= "Modify column emp_no bigint not NULL auto_increment" H=192.168.31.64,p=3306,d=employees,t=tmp_employees-- ExecuteCreate an intermediate table that is the same as the original table structure, with the name generally beginning with _ and new endingCREATE TABLE ' employees '. ' _tmp_employees_new ' (' Emp_no ' bigint (+) not NULL auto_incr