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Real-time monitoring of MySQL using mytop under CentOS

machine where mytop is installed, specify or modify the configuration file settings with parameters. parameter specifies $ mytop -u Modifying a configuration file $ vim ~/.mytop user= Mytop shortcut keys s:设定更新时间 p:暂停画面更新 q:离开 u:只看某个使用者的thread o:反转排列顺序 Monitoring Screen parameter interpretation The Mytop and Linux top commands show similar results, showing the current state of each thread and dynamic changes. $ mytop-uroot-pmysql-d wordpress-h 127.0.0.1 MySQL

Linux View login log for system users

View log of user log on system There are two types of logging user logon behavior, one is to record the data of the login, one is to record the user's logon time One, log the user login data /var/log/ The wtmp log file records the user's logged-on data. But this file is encoded file, not directly with the VI, cat and other commands to view, can be read with the last command. Each login will produce a record, including user name, login, time span and other information, as follows: www.2cto.c

Python regular re module

Today's content:Knowledge Point one: RegularWhat is a regular:is to use a series of characters with special meanings to form a set of rules that are used to describe a character string.The regular is used to remove a small string of rules in a large string.Why use the Regular:1. User Registration2. Crawler programsHow to use:Re.findallRe.findall module:\w letters, numbers, underscoresPrint (Re.findall (' \w ', ' yangzz:age_18 '))\w no letters, numbers, underscoresPrint (Re.findall (' \w ', ' yan

Pure JavaScript Implementation HTML5 Canvas Six kinds of effects filter examples _javascript tips

; var r = tempcanvasdata.data[idx2 + 0]; var g = tempcanvasdata.data[idx2 + 1]; var B = tempcanvasdata.data[idx2 + 2]; Sumred + = r; Sumgreen = g; Sumblue + b; } } Calculate new RGB Value var nr = (sumred/25.0); var ng = (sumgreen/25.0); var nb = (sumblue/25.0); Clear previous for next pixel point sumred = 0.0; Sumgreen = 0.0; Sumblue = 0.0; Assign new pixel value Canvasdata.data[idx + 0] = nr; Red Channel Canvasdata.data[idx + 1] =

MySQL Table partitioning Experiment summary

, 200 to 299 when saved to the P3 partition, greater than 300 to save to the P4 partition;[[email protected] test] #dirA.frm a#p#p1.ibd a#p#p2.ibd a#p#p4.ibd db.optList partition:CREATE TABLE BC (ID INT not NULL auto_increment,Par_no INT not NULL DEFAULT ' 1 ',A_name CHAR () not NULL,PRIMARY KEY (id,par_no)) Engine=myisam CHARSET=GBK PARTITION by LIST (Par_no) (PARTITION p0 VALUES in (10,20,30),PARTITION p1 VALUES in (40,50,60),PARTITION p2 VALUES in (70,80,100));The value of the par_no must exi

On the reflection mechanism of Java

//get all the constructor method collections Constructor con1[] = cls1.getdeclaredconstructors (); con1[1].setaccessible (TRUE); obj1 Object = con1[1].newinstance (new object[]{"Tom"}); System.out.println (OBJ1);  To explain: The first is to get a specified method, we specify that the parameter is a string type, the second paragraph we get all the constructor method collection, and select one of them to create a new object.  Note that the constructor Newinstance m

Take minutes to get rid of all the triangles in the CSS that make you bothered

Words don't say much, direct. triangle-one { Display:inline-block; border-top:50px Red Solid; border-right:50px Green solid; border-bottom:50px Yellow Solid; border-left:50px Blue Solid;}. triangle-six { Display:inline-block; border:50px transparent solid; border-bottom:50px Yellow Solid;}. triangle-eight { Display:inline-block; border:50px transparent solid; border-left:30px Yellow Solid; border-bottom:0;}Using the Border Override property:  A sharp angle lik

Example of six special filter effects for HTML5 Canvas implemented using pure JavaScript

. width, src. height );Dst. data. set (src. data );Return dst;},/*** Convolution-keneral size 5*5-blur effect filter (Fuzzy effect)** @ Param context* @ Param canvasData*/BlurProcess: function (context, canvasData ){Console. log ("Canvas Filter-blur process ");Var tempCanvasData = this. copyImageData (context, canvasData );Var sumred = 0.0, sumgreen = 0.0, sumblue = 0.0;For (var x = 0; x For (var y = 0; y // Index of the pixel in the arrayVar idx = (x + y * tempCanvasData. width) * 4;For (var su

"The top of the tide"--the Imperial Book of the Century

-speed development only Microsoft, Intel, and Cisco have done, although athas been in the world for nearly 100 years, but it did not escape the fate of the acquisition, because few people can calmly see the crisis behind the rapid development. As a business manager,it industry, he must understand the industry, when our eyes on income, profit, cost control high-speed growth, at any time to pay attention to the changes in the business tide, and make proactive measures, this is probably the most ef

How the C language in Linux system calls functions in ScaLAPACK

In parallel computing, it is often necessary to call the functions in the SCALAPCK (parallelized lapack) function library to program, here is a brief introduction to the C language how to call the matrix vector multiplication in the SCALAPCK function.Note: The functions in ScaLAPACK are written in Fortran, and the matrices are stored in columns.ScaLAPACK links need to be Blas, so make sure Blas, Gfortran is installed on this machine.The following is an example of matrix vector multiplication (fo

HTML Getting Started table and form

Width width Border Border cellpadding The spacing between the contents and the cell cellspacing align alignment between cellsbgcolor background color Backgrou nd background plot cheat Align horizontal alignment of content valign vertical alignment of content height row height bgcolor background color background background image Align horizontal alignment of cell contents valign the vertical alignment of cell contents width cell height of cellbgcolor background color background background imagec

Linux Entry Basics _centos (ii)--FDISK partition

prompt to enter n, nbsp nbsp Next, the system prompts us: What partition do we need to create? E Extended extended partition, p primary partition Main division N Bsp We remember what we said earlier: Due to the partitioning mechanism of MBR: 446bytes Install boot loader boot LOA der () nbsp , NB Sp + N Bsp , NB S

HBase Common examples of shell commands __hbase

disable the table before you report the following error: HBase (main):006:0> alter ' member ',name=> ' member_id ',method=> ' delete ' ERROR: Org.apache.hadoop.hbase.TableNotDisabledException:org.apache.hadoop.hbase.TableNotDisabledException:member at org.apache.hadoop.hbase.master.HMaster.checkTableModifiable (hmaster.java:1525) at org.apache.hadoop.hbase.master.handler.tableeventhandler.The correct way to delete a column family: First disable the table: HBase (Main):007:0> disable ' m

Kernel notification chain

linked list pointed to by NL. 4. Notification linked listWhen an event occurs, use notifier_call_chain to send a message to a notification linked list.Int notifier_call_chain (struct notifier_block ** NL, unsigned long Val, void * V)This function runs the functions registered on all nodes on the linked list directed to by NL in order. To put it simply, it is shown as follows:[Copy to clipboard] [-] Code:Struct notifier_block * NB = * N; While (

Hive notes (self-paced)

The first part: User ManagementUser created: Create DATABASE XXXView User: Show DATABASES; key View User: Show DATABASES like ' de.* ' explanation: Creating a user is equivalent to creating a file in the physical directory that ends in. db, The default path is:/user/hive/warehouse/zqx.db When creating a user you can specify the path: Create DATABASE XX x NB Sp location '/my/preferred/directory ' explanation: Convenient

The difference between conv2, Filter2 and IMFilter

Today saw the altar master math and the Forum of other cattle tolerance distortion, listen to the report feeling a lot, a word refueling it.-------------------------------------conv2 function ----------------------------------------1. Usage C=conv2 (A,b,shape); % convolution filter Copy CodeA: Input image, B: Convolution coreAssuming that the input image A is a size of Ma x na and the convolution core b size is MB x NB,When Shape=full, r

VirtualBox Installing the CentOS virtual machine

, you can choose the default, I built it on the D-disk, to see a person's preferences.then just wait . Set startup item after creation, select the CentOS image file downloaded on the website select Select Start N Bsp NBSP; and nbsp , NB Sp , NB Sp , NB Sp ,

iOS Framework Introduction

iOS Framework IntroductionCocoa TouchGamekitEnable Game Center support to allow users to share their game-related information onlineBluetooth data transfer between iOS devices expires from iOS7 LAN game http://www.cnblogs.com/KidReborn/archive/2011/10/17/2215641.htmliAdUsed to provide an ad bar in the app to merge with the user UI view, with Apple'sThe IAD service works together to automatically process, load, and render rich media ads and respond to clicks on those banners for all relevant work

201521123087 Java programming Eighth week of study summary

1. Summary of this week's study2. Written workThis job title set集合 Deletion of the specified element in list (topic 4-1)1.1 Lab summary nbsp , NB Sp , NB Sp , NB Sp , NB Sp , NB

MySQL's foreign key

));CREATE TABLE EMP (ID int primary KEY auto_increment,Name Char (16),Gender enum (' Male ', ' female ') not null default ' male ',dep_id int,Foreign KEY (dep_id) references dep (ID));#2, constraint 2: When inserting records, you must first insert the associated table DEP to insert the associated table EMPInsert into DEP (dep_name,dep_comment) values(' SB-teaching ', ' SB-tutor ' study, teach Python course '),(' Foreign Ministry ', ' old boy ' Shanghai campus Ambassador to Zhangjiang '),('

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