pt 2430pc

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

When pt-online-schema-change is used for the relationship between pt-online-schema-change and default value, the following error occurs, causing table modification failure: Copying rows caused a MySQL error 1364, Message: Field 'XXX' doesn' t have a default value Example 1: # Modified SQL: ALTER TABLE 'live _ comment' ADD 'sourcefrom' VARCHAR (15) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL comment

Commonly used in 2 kinds: px, pt. What's the difference between these two? 　　Px:pixel, pixel, the smallest unit displayed on the screen; 　　Pt:point, Dot, is a standard length unit of the printing industry, 1pt=1/72 inches; 　　In Windows, the default display setting is to define the text as 96dpi. This explains: 1px=1/96 inches while 1pt=1/72 inches can be drawn, in this setting 1px=0.75pt, Font 9pt=12px. 　　However, the user can modify the DPI size of t

Port security Configuration for the Cisco PT Simulation Experiment (7) switchExperimental Purpose : Master the port security function of the switch, control the user's secure accessExperimental Background : The company network adopts the personal fixed IP Internet program, in order to prevent the company internal User IP address borrowing, using, unauthorized access to the switch and other violations, while preventing public and internal network attac

1, px Pixels (Pixel). Relative length units. Pixel px is relative to the display screen resolution. The smallest point that a screen device can physically display is not a fixed width, and the aspect ratio of points on different devices may be different or not necessarily a square of 1:1. For example, a monitor on the 1px wide =1mm, but B monitor 1px wide =2mm, if the definition of a div width for the 100px,a monitor see on the div is 10cm,b on the monitor to see that the div is 20cm. 2.

we'll set up a catalogue.I built the directory, the inside is empty, we do not have to check.Then, let's see if we can execute the command without a path.The problem here, the basic solution, and you enter pt-, direct table, directly fill up your command, haha. It's much more convenient.The road is here, and the next exploration is not much to say. We are all ape-men, this spirit is still there.Finally attach the official website's help document, the

Tags: pt-killPercona Pt-kill Lite VersionAdd more slow SQL Mail alerts after killing is sentNote: The official original version of the default is killed by the SQL will not send mail, which will not be able to notify the development of timely, the troubleshooting problems caused confusion.Students who purchase a course can log inHttp://edu.51cto.com/course/course_id-4580.htmlSee Help for use.This article is

System performance tuning in particular MySQL database tuning a primary basis is the slow query log. Originally there is a powerful tool on Ubantu or CentOS is Percona Toolkit, then how to use Pt-query-digest on Mac?Download Percona ToolkitAccess Http://www.percona.com/downloads/percona-toolkit, use source code installation, download the latest stable version of 2.2.7.650) this.width=650; "src=" http://img.blog.csdn.net/20160608212319520 "alt=" here w

NAT-PT is a network address converter with protocol conversion. By modifying the protocol header, you can change the network address so that IPv4 nodes and IPv6 nodes can communicate with each other. Different from some tunneling technologies, NAT-PT only needs to be enabled on the network conversion device that is interconnected between IPv4 and IPv6, the purpose of protocol conversion is to achieve the co

Build environment: WIN7+XAMPP (5.5)Web site root directory: D:\IT\XAMPP5.5\htdocs\ 1 Download the source code program http://sourceforge.net/projects/nexusphp/, extract to the site root directory.2 Creating a Database pt, importing _db\dbstructure.sql3 Modifying the nexusphp configuration file:config\allconfig.php　 ... $BASIC =array ( ' SITENAME ' = > ' sqd-pt ', // site name ' Baseur L ' = '

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

MySQL's online table structure is modified because of inefficient and blocking read and write. has been criticized. As for the principle of alter TABLE, see my previous article. MySQL modifies the large table structure online. After reading, found that the problem is still locked, and for the online update of this block is not very good processing, so can only be understood theoretically, applied to the online library or there is a problem. The latest data is not guaranteed.Today we see the same

JSON (repeated Cr into pT Object Notation) Advantages:1. The data format is relatively simple, easy to read and write, the format is compressed, and the bandwidth usage is small2. It is easy to parse this language. The client-end javascr into pT can simply read JSON data through eval ().3. Supports multiple languages, including actionscr platinum PT, C, C #, Cold

A script for slow query log tracking based on pt-query-digest Percona-toolkit is called MySQL DBA's "Switzerland ***", and its strength is self-evident. The slow query and analysis tool "pt-query-digest" provides many additional attributes, such as flexible filters, compared with the official "mysqldumpslow, database and table-based analysis and sorting. Today, we will share a small script that automaticall

The width of a 10 pt font is required for a webpage today. After thinking about it for a long time, I did not calculate it. I checked the information and finally calculated it. by the way, let's take a look at the pt ps and DPI concepts: PT: in the printed layout, "point" is an absolute unit. It is equal to 1/72 inch. It can be measured by a ruler in a physical

Pt-Osc Test 1. The original table must have the primary key or unique key. The new table `darren`.`_t_user_new` does not have a PRIMARY KEY or a unique index which is required for the DELETE trigger.Please check you have at least one UNIQUE and NOT NULLABLE index. 2. For tables with foreign key constraints, add the -- alter-foreign-keys-method = rebuild_constraints parameter. 3. triggers cannot exist in the original table by default. But the -- preser