Shell

SQL statement OptimizationI. General steps for SQL optimization(1), through the show status command to understand the frequency of execution of various SQL.(2), positioning execution Less efficient SQL statement-(key Select)(3) Explain analysis of

MySQL partition experimentBrief:I. Partitioning by partition typeII. Administrative Divisionexamples of partitions and non-partitioned tablesfirst, establish the partition to hash partition for example(1), non-linear hash partition1. Test table

The specific hbase shell commands are shown in the following table:View hbase Status: statusView versions of HBase: VersionCreating a scores table: Create ' scores ', ' Grad ', ' course 'See what tables are in the current hbase: ListView the

[email protected] ceshi]# cat test.sh#!/bin/bash# test.shecho "-------------ISF is set to \"-seperator\ "------------"Ifs= "-seperator"; # Note that there is a minus sign (-) before SeperatorFor i in "[email protected]"; Do echo "@ ' $i '"; DoneFor

[email protected] ceshi]# cat test.sh#!/bin/bash# test.shecho "-------------ISF is set to \"-seperator\ "------------"Ifs= "-seperator"; # Note that there is a minus sign (-) before SeperatorFor i in "[email protected]"; Do echo "@ ' $i '"; DoneFor

The while loop is used to continuously execute a series of commands and to read data from the input file; the command is usually a test condition. The format is: while Command Do If True done The following is an example of a basic while

When writing a program, the condition is used to determine whether the test condition is established. Many times, the judgment condition is multiple, this time needs to use the logical operator. What are the logical operators that are commonly used

Script Programming Control Structure:OrderSelect: If, caseLoops: For, while, untilFor variable in List;doStatementDoneFor ((CONDITION));d oStatementDoneWhile Condition;doStatementDoneUntil Condition;doStatementDoneLoop Example: Test whether all

Difference:internal command: Internal commands are built into the shell. The internal command executes very quickly when the shell command is executed. This is because no other process has been created because of the execution of this command. For

SummaryThis chapter describes how to use ls and stat to expose files and file meta data , and how to use Touch set the time stamp not seen . Touch can display information about datetime and scope limitations on many existing systems .Shows how to

1.sh-x ScriptThis executes the script and displays the values of all variablesFor example, script:#!/bin/bash#a test about shiftif$#0 ]thenecho"there is no parameters"exit0fisum=0while$#-gt0 ]do $sum$1` shiftdoneecho$sumOutput:2.sh-n ScriptDo not

d211 Admin # for I in {3..254}; Do ping-c 1 192.168.1. $i &>/dev/null && echo 192.168.1. $i is alive ;d One192.168.1.5 is alive192.168.1.7 is aliveFping-a-G 192.168.5.1 192.168.5.177-s-N >lele.txt -A Show systems that is alive.- G Generate a target

1. Command history:By pressing the UP ARROW key, you can traverse backward through the most recently entered command under the console, and by pressing the DOWN ARROW key, you can traverse the command you recently entered under the console.You can

1. ls commandThe LS command is the meaning of listing directory contents (list directory Contents). Running it is to list the contents of a folder, possibly a file or a folder.The "ls-l" command lists the contents of the folder in detail mode (long

From Shell13 asked-E: Activate the conversion of the backslash control character (refer to the following table)-e: Turn off anti-skew control character conversion (preset)-N: Cancel line end of line symbol (with the \c character under the-e

[Basic ideas]Group records that originally had a large number of records. Cut into a number of sub-sequences, at this time each sub-sequence to sort the number of records is less, and then in these sub-sequences are directly inserted in the order,

Beijing time July 1 10:00, peanut Shell (hsk.oray.com) company issued a "Peanut Shell remote Management" platform. This platform is mainly used to manage the embedded peanut shell, such as the embedded management of the peanut shell in the Qnap Nas,

After the first two articles, so far, we have acquired the external domain name and set up the SVN server, next, we will summarize how to implement access to the local area network.1. Install VISIUALSVN Server (visible: http://blog.csdn.net/lu930124/

Shell-automatically deploy war packages to tomcat and shell-tomcat#! /Bin/shCURL = $1CRootDir =/data/tomcat-usercenterShRootDir =/data/tomcat/dll# Delete old versionRm-rf $ shRootDir/usercenter-web.war *# The default war package address is the last

Shell Script Programming #! /Bin/bash # Fibonacci sequence # Do not use recursion. If the depth is greater than 30, it will get old. Function fun_test () {if [$1-lt 3]; then echo 1 return fi sum1 = 1 sum2 = 1 let count = $1-2 sum = 0 while [$