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Give Plsql wings to fly-plsql optimize

optimization > A no-go index optimization caseThis sample illustrates the case. Suppose you have a word that participates in the field of the Where condition query. However, it participates in the operator, so it is not indexed in Oracle's internal run-out plan. So we made a little change. How many times has the efficiency improved? 5.3 Times times, 530%. Oh!In the example above, we can make a summary of the index creation.Summary of index creationTable AnalyzeAnalyze Table VS Dbms_statsWaterma

Test staff Common Linux commands

, of which there are 3 in the running, 127 in hibernation (sleep), 0 in the stoped state, and 1 in the Zombie State (zombie). Third line: CPU status 10.6% US user space as a percentage of CPU usage. 2.2% Sy Core Space consumes a percentage of the CPU. 0.0% NI changed the priority of the process to occupy the percentage of CPU 84.5% ID idle CPU percentage 2.5% wa io wait cpu percentage 0.1% hi hard Interrupt (Hardware IRQ)% of CPU 0.0% si soft interrupt (software Int errupts) Percentage of CPU us

Linux Disk Management (i)

Head (head): Read and write data to disk Track: When the disk is rotated and the head remains in one position, each head will draw a circular trajectory on the disk surface called the track. A track on a disk is a set of concentric circles with different recording densities Sector (sector): each track on a disk is divided into segments that are sectors of the hard disk. The first sector of a hard disk, called a boot sector. The size of a sector is 512 bytes Cylinder (cylind

Linux Operations One: installation of production environment CentOS6.6 system

primary or extended partition, and the logical partition (which is based on the extended partition) number can only start at 5 Basic requirements for partitioning for Linux systems at least one root (/) partition is required to store system files and programs. It is at least 5GB in size to have a swap partition, which acts as virtual memory in Windows, the size of the swap partition is typically 1.5 times times the physical memory capacity (memory "but when the system physic

Become a Java GC expert (5)-java Performance Tuning principles

maintainability. When running the JVM on multiple servers, you can also choose to run multiple JVMs on a single server or on each server to run one JVM. For example, for each server, you can run a JVM that uses 8GB of heap memory, or you can run 4 JVMs that use 2GB. You should decide this number based on the number of processor cores and the nature of the program. Using 2GB of heap memory is better than 8GB

Lenovo Miix 5 Win10 Two in a notebook how about

equipped with the sixth generation Intel Core I processor, the highest 8GB DDR4 memory +512GB Solid-State Drive, Lenovo said, its CPU comprehensive ability to increase 50%, graphics performance increased by one times. Price, 4GB+128GB Elite version of the sale of 4399 Yuan, 8GB+256GB Prestige edition 5499 Yuan, 8GB+512GB flagship edition sold 7499 Yuan, are pre

How much is the DDR4 memory frequency appropriate?

DDR4 How much memory frequency is appropriate? For computer enthusiasts, the greater the memory frequency, the faster the speed is relative. In today's latest DDR4 memory era, how much memory frequency is appropriate? Today's small series will share the DDR4 memory high and low frequency on the computer performance and CPU, graphics, game performance impact, I believe you can find the answer. DDR4 is the memory frequency larger and faster? measured high and low frequency DDR4 memory

Android will upgrade Xamarin for VS to version 4.1.0.530 Tutorial _android

one, can not be used at the same time. Comprehensive consideration of the above factors, for Intel's CPU, currently still with Google's Android simulator and HAXM GPU Accelerator is more convenient, in the computer expansion to 8GB memory, the operation speed is also fast, upgrade simple, flexible configuration, the use is also very convenient. For ARM CPUs, Google's Android simulator is also up to speed when the computer expands to

High-value high-end console water-cooled assembly computer 6666 yuan i7-4790k/gtx970 configuration

Machine parameter Configuration CPU frequency: 3.0GHz and above CPU Type: intel/Intel Core i7 Motherboard Brand: asus/ASUS Motherboard structure: ATX Memory Brand: kingston/Kingston Memory Type: DDR3 Memory Frequency: 2400MHz Brand: Beijing Tian Hua Sheng Sound card interface type: PCI Platform type: INTEL 1150 Cooling mode: Liquid Cooling Whether intelligent temperature control: is Video card brand: colorful/seven Rainbow Video memory bit width: 256bit Memory Type: GDDR5 Maximum m

Thin or thick (continued), the empirical new conclusion!

mirrored 146GB 10K to SAS drives, and shared storage is NetApp fas3020c, with software iSCSI connectivity, The MPIO is used in the design of the storage network. The VMFS LUNs for shared storage are experiment-specific, with no other load on it, and the blade server is only an experimental VM, with no additional load. The reason why such a specific description of experimental equipment, is to express a clear meaning: server, network, storage performance is sufficient, does not cause performance

Give Plsql wings to fly-plsql optimize

watch it go.Conditions in which the index does not take effectSo the index does not build, sometimes built is also Perkins, why? Take a look at the following case studies:Take the case to illustratePlsql optimization > A no-go index optimization caseThis example shows that if you have a word for a field that is queried by the where condition, but it is involved in the operator, it is not indexed in Oracle's internal execution plan, so we made a small change, how many times is the efficiency imp

10 tips for creating a CSS style sheet

style without altering the content of the Web page, OH, you'll have to find the junk code that you've lost in every nook and cranny, and if the project happens to be very large, then I'm afraid only good luck, Or recommend you to find Huang. Don't get yourself into such trouble, create clean code, and keep them clean all the time, so you can make your life a lot more enjoyable. Note: Be careful with too many external style sheets, and if you create

ASP. NET breakpoint continued to pass

Using System; Using System.Data; Using System.Configuration; Using System.Collections; Using System.Web; Using System.Web.Security; Using System.Web.UI; Using System.Web.UI.WebControls; Using System.Web.UI.WebControls.WebParts; Using System.Web.UI.HtmlControls; Using System.IO; Public partial class DFile:System.Web.UI.Page {protected void Page_Load (object sender, EventArgs e) {} protected void Linbtndfile_click (object sender, EventArgs e) {//Create a bit arr

Batch processing to achieve the timing shutdown, cancellation, restart, lock and other functions _dos/bat

time format, please re-enter ECHO. GOTO Yesno ECHO Please specify a 24-hour format for hour minutes SET shutdowntime= SET P shutdowntime= Input At%shutdowntime% Tsshutdn 0 delay0 powerdown nul IF not errorlevel 1 GOTO OK ECHO%shutdowntime% is not a standard time format, please re-enter ECHO. GOTO Nook ECHO. SET h=%shutdowntime~1,1% SET ah=%shutdowntime~0,1% SET am=%shutdowntime~2,2% SET bh=%shutdowntime~0,2% SET bm=%shutdowntime~3,2%

Thinkphp the method _php the visitor to the handset side or the PC end instance

", "Nexian", "Nf-browser", " Nintendo "," Nitro "," Nokia "," Nook "," Novarra "," Obigo "," Palm "," Panasonic "," Pantech "," Philips "," Phone "," pg-"," PlayStation "," Pocket "," pt-"," qc-"," Qtek "," Rover "," Sagem "," sama "," Samu "," Sanyo "," Samsung "," sch-"," Scooter "," sec-"," Sendo "," sgh-"," shARP "," Siemens "," sie-"," SoftBank "," Sony "," Spice "," Sprint "," SPV "," Symbian "," tablet "," Talkabout "," tcl-"," Teleca ", "Telit

jquery Implementation click the button Mask Pop-up dialog box (cat-like delete dialog box) _jquery

window size changes $ (window). Resize (function () { if (!$ (". Dialog"). Is (": visible")) { Return } ShowDialog (); }); Register Close Picture Click event $ (". Title img"). Click (function () { $ (". Dialog"). Hide (); $ (". Mask"). Hide (); }); Cancel Button Event $ ("#noOk"). Click (function () { $ (". Dialog"). Hide (); $ (". Mask"). Hide (); }); OK button leave $ ("#ok"). Click (function () { $ (". Dialog"). Hid

2018-4-22 17 weeks 4 Lessons Shell alarm System script Configuration

# #发送邮件Fiecho "' Date +%t ' 502 $c _502"disk.sh Content#! /bin/bash# #Writen by alex##Rm-f. /log/disk.tmplang=enFor R in ' Df-h |awk-f ' [%]+ ' {print $} ' |grep-v use ' # #以一个或多个空格或% as delimiterDoIf [$r-gt] [$send-eq "1"]Thenecho "$addr ' date +%t ' disk useage is $r" >> /log/disk.tmpFiIf [-F. /LOG/DISK.TMP]ThenDf-h >>. /log/disk.tmp/bin/bash. /mail/mail.sh $addr \_disk $r. /log/disk.tmpecho "' Date +%t ' disk useage is Nook"Elseecho "' Date +%t '

Shell Construction Alarm System

##load=`uptime |awk -F ‘average:‘ ‘{print $2}‘|cut -d‘,‘ -f1|sed ‘s/ //g‘ |cut -d. -f1`if [ $load -gt 10 ] [ $send -eq "1" ]then echo "$addr `date +%T` load is $load" >../log/load.tmp /bin/bash ../mail/mail.sh [emailprotected] "$addr\_load:$load" `cat ../log/load.tmp`fiecho "`date +%T` load is $load"502.shCode:#! /bin/bashd=`date -d "-1 min" +%H:%M`c_502=`grep :$d: $log |grep ‘ 502 ‘|wc -l`if [ $c_502 -gt 10 ] [ $send == 1 ]; then echo "$addr $d 502 count is $c_502">../log/502.tmp

Logical judgments in shell scripts, file directory attribute judgments, if special usage, case judgments

Logical judgment in the shellFormat 1:if condition; Then statement; FiIf it's what it is, then what happens?Write a simple script that means when a=5, when a is greater than 3 o'clock print OK#!/bin/bashA=5If [$a-GT 3]ThenEcho OKFiExecute script after saving exit[Email protected] shell]# sh if1.shOkOne of the GT's meanings in the shell is greater than the meaning. Note that there are spaces in the brackets, both sides and in the middle.Format 2:if condition; Then statement; else statement; FiWha

2018-06-04 Linux Learning

. /mail/mail.sh [email protected] "$addr _load: $load"cat ../log/load.tmpFiecho " date +%T load is $load"Shell Project-Alarm system 502.sh502.sh Content#! /bin/bashD=date -d "-1 min" +%H:%MC_502=grep :$d:??$log??|grep ‘ 502 ‘|wc -lIf [$c _502-gt] [$send = = 1]; Then? ??? echo "$addr $d 502 count is $c _502" ... /log/502.tmp? ??? /bin/bash. /mail/mail.sh $addr _502 $c _502??.. /log/502.tmpFiecho " date +%T 502 $c _502"Shell Project-Alarm system disk.shdisk.sh Content#! /bin/bash# #Writen by amin

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