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the difference of DDR2 DDR3 • Further reduction in power consumption The default voltage of DDR2 memory is 1.8V, and the default voltage of DDR3 memory is only 1.5V, so the power consumption of memory is smaller and the calorific value is correspondingly reduced. It is worth mentioning that DDR3 memory also added temperature monitoring, the use of ASR (Automatic Self-refresh) design, by monitoring the temperature of the memory particles, minimize the refresh of the new frequency to reduce tem

number of threads always kept running. If not specified, the default is used. My simple understanding is: The maximum number of threads that can be maxthreads:tomcat the thread pool; Maxconnections:tomcat requests (connections) that can be processed concurrently; Acceptcount:tomcat maintain the largest number of columns; Minsparethreads:tomcat the size of the thread pool initialized or the Tomcat thread pool will have at least so many threads. It is easy to mix the two parameters of MaxThreads

error match. Once a regular expression is released into the actual code, you may not notice both. Consider the example of the phone number above, which will match "800-555-4000 =-5355". Bad matches are hard to find, so it's important to plan ahead and do the testing. or using the phone number example, if you confirm a phone number in a Web form, you may want to settle for a 10-digit number in any format. However, if you want to separate phone numbers

times. That is to say, if your company's website is of medium level, it should be estimated that 27 people have come to see it or have averaged five persons to see five times. This projection is very rough, But what I want to say is that if you don't make any effort, it's not a simple thing to get 80 or 800 trips a day, if you don't do anything. Why are so many companies not paying attention to site visits? The reason is very simple, I take a metaph

Busy work, a few days did not update the blog, but did not stop the SEO observation. Today, share the next page of the pull out of the hair. Pulling hair: Refers to the search engine's one kind of punishment, manifests the site quantity extremely has the descent. Usually happens in Baidu. Just a few days ago, my old version of the gold bottle Mei station was Baidu hair, and also occurred in the site of the status of Zero, but the ranking is still there. Part of the observation data is as follows

: Ifconfig eth0 Add 33FFE:3240:800:1005::2/64 Ifconfig eth0 del 33ffe:3240:800:1005::2/64 Output: Description: Ifconfig eth0 Add 33ffe:3240:800:1005::2/64 Configure IPV6 address for NIC Eth0; Ifconfig eth0 Add 33ffe:3240:800:1005::2/64 Remove IPV6 address for Nic Eth0; practice, SSH login Linux server operation should

Dear Boss: I have a query for the SQL statement to consult, I hope to be able to get results with a SQL statement, the problem is as follows: Table x: A B C D ------------------ BEIJING Guangzhou 1000 10 Beijing Shenzhen 1200 20 Beijing Shanghai 500 30 Beijing Tianjin 300 40 Beijing Henan 800 20 Table y: A B ---------- Beijing Shenzhen Beijing Shanghai Table Z: A B C D ------------------ BEIJING Guangzhou 200 10 BEIJING Shanghai-100-10 Beijing Si

do a reasonable frame layout. 1. ResolutionThe overall width of a Web page can be divided into three settings: percent, pixel, pixel + percent. Usually in the construction of the website is the most common pixel form, the industry site is not listed outside. When we design a Web page, we will certainly take into account the resolution of the problem, technology development to now we usually use the resolution of 1024*768 and 800*600, now many of the

-bullion is a promising way to pay for the Internet. Click: "Here" registrationContact info[Information]Title [Choose the right Oh]A-NameMI [Ignore it]Last name [surname]Suffix [Ignore it]email [email Address]Re-enter email [duplicate email address]Type account[Account Types]Business Account Personal Accounts [Recommendation: Select personal Number]Business Name (when applicable) [can ignore it]address[Contact Information]Street [your contact address]City [Cities]State Select a state [select non

Once a friend asked me how to quickly online to a large table to add a field or modify the length of a field, the MySQL version is 5.6, so prepare a test environment to prepare a 100 million records of the table, and then to the actual test in which way faster, first to start preparing 100 million records of the table.I have hundreds of millions of records on the line of the table, but a lot of online friends are not, then I practice here a way to achieve their own construction of 100 million da

string is used.1.21, Timeout_on_resourceDescription: For ORA-00051, this exception is triggered if a time-out error occurs while Oracle waits for a resource.2. Handling of pre-defined anomaliesDescription: Here are two common exceptions no_data_found and too_many_rows, both of which are triggered by a SELECT INTO statement.Example:DeclareV_CNT Number: = 800;V_name Emp.ename%type;BeginSelect Ename to V_name from EMP where sal=v_cnt;Dbms_output.put_lin

.png "/>Use the case expression in the common syntax of the SQL99 standard, the position is the analyst, the salary is +1000, the position is the manager, the salary is +800, the position is other, the salary is +400.Case FieldWhen condition 1 then expression 1When condition 2 then expression 2else Expression nEndAfter class please refer to Select Ename "Name", Job "job", Sal "pre-pay", Case job when ' ANALYST ' then sal+1000 wh En ' MANAGER ' then sa

My colleague raised a question: How can I obtain the current file name in the JavaScript file dynamically inserted in the browser? Background My colleague raised a question: How can I obtain the current file name in the JavaScript file dynamically inserted in the browser? In addition to a file name output by the server, the following three methods should be obtained in the script. Solution The general solution can only be used for page static scripts label introduction or single dynamic loadin

that indicates the number of milliseconds. It is used to set the delay time of the next queue.QueueNameA string used as the queue name.Effect:We can Set a latency of 800 milliseconds between. slideUp () and. fadeIn () animations:$ ('# Foo'). slideUp (300). delay (800). fadeIn (400 ); Hide and then show two p. The green p has a latency of 800 milliseconds before

Work encountered in the picture to Gray degree group needs, after research and the guidance of the great God, finally get the following two methods, can realize the bitmap to Gray degree groupThe simple bitmap to Gray degree group is: to get each pixel in the bitmap, and then based on the pixel points to get the RGB value, and finally the RGB value, according to Gray-scale algorithm to get gray value can be/* such as a picture of a 480*800, eventually

the following.So, for example, array[0]=100, we knew to draw a bar at x=0, a height of 100 units long, array[1]=50, and then in X=1 draw a column with a height of 50 unit length, and from this analogy, if you use a for loop to iterate through the array to draw it all out, is what you see.SamplingBut we're not going to have that effect, we just have to take a sample of all the data, such as setting a step 100, a progress pump, to draw some bars in the entire spectrum.Or first of all, according t

on internal elements. The perspective attribute defines the depth of the Z axis plane and the relative size of the elements above and below the plane. In general, the smaller the perspective value, the larger the object, the closer it is to you. The larger the perspective value, the smaller the object, and the farther away it is from you. You can use http://www.webkit.org/blog-files/3d-transforms/perspective-by-example.html#effect. The perspective-origin attribute defines the origin of the pers

attribute defines the depth of the Z axis plane and the relative size of the elements above and below the plane. In general, the smaller the perspective value, the larger the object, the closer it is to you. The larger the perspective value, the smaller the object, and the farther away it is from you. You can use http://www.webkit.org/blog-files/3d-transforms/perspective-by-example.html#effect.The perspective-origin attribute defines the origin of the perspective.Css:The Code is as follows:# Ex

Learning notes: App transduction-Details Android and iOS platformsReprinted from: http://www.woofeng.cn/articles/168.html Copyright belongs to the original author allYa Ru has leeOriginal address: http://blog.boocss.com/app-android-ios/One. Android versionIn the Android version of the design, there are many sizes, then we want to use a size as the benchmark, then the benchmark size is 480px*800px, after the completion of the plan to start cutting diagramTo be aware of:A:android mainly has 3 kind

research or can find a lot of problems, can see the hypothetical resolution is 1280*800, screen density is 1.33125. Then the height of the corresponding CSS should be 600.99px. The bottom virtual button occupies 48px. With this data you can do a screen fit.Samsung N5100 Tablet, android4.407-15 11:12:56.316:e/metrics.density (23926): displaymetrics{density=1.33125, width=1280, height=800, scaledDensity= 1.7