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Must-see | A must-have tool in Linux OPS that makes you 10 times times easier

remote target host;    Press O to toggle whether the current connection is fixed only;    Press F to edit the filter code, this is translated by the saying, I have not used this!    You can use the shell command, this is useless! I don't know what the order is.      Press Q to exit the monitor.    In Linux operations, there are many such tools and methods to use, want to quickly learn these? Have many years of experience in the teacher, take you to learn Linux operations, let you less detours

Explore SQL to add nonclustered indexes, dozens of times times the puzzle of performance improvement

nonclustered indexes . The main purpose of database indexing is to improve the performance of SQL Server system, speed up the data query and reduce the response time of the system . But this does not mean that the more indexes (nonclustered indexes) the better. An appropriate index design can significantly improve performance, and vice versa. When our technical support to the customer Design index, the query time is still not improved as scheduled. This is an example of an inappropriate nonclu

Bitwise operations Solve "one array, only one number appears n times, other numbers occur K-times" problem

Turn from: 52928864After learning the bit operations, you will often encounter a class of questions about finding missing integers.The first class is to give you an array that tells you what the range of these numbers is, and then lets you look for this missing number (for example, the range of unordered arrays is from 1 to 10, not repeating 9 numbers). The solution to this type of problem is more diverse, the first, because given the range can be calculated by calculating the sum of the numbers

Go--Optimize temporary table usage, SQL statement performance 100 times times increase

the optimization of about 50s, optimized after the first 0.3s, the second 0.1s, the optimized execution speed is 100 times times more, Io from 100% to less than 1% on the SSD machine testing, optimization before the need for 7s, Optimization after the first 0.3s, the second 0.1s, the optimized execution speed is 10 times tim

How can I avoid php automatically changing & times to ×?

How can I prevent php from automatically transferring times to the API of the other party? a timestamp value needs to be sent. as a result, PHP directly converts timestamp to × tamp, which is a headache. Reply to discussion (solution) Impossible!Paste your sample code I have encountered this problem several times.When the browser parses html, it will display the string '×' as the symbol' ×'. when you view the source code of the webpage, you w

Sensitive word substitution algorithm, 4 times times higher efficiency than str_replace (with 6 thousand sensitive words)

Efficiency comparison(12,688 characters, replace 1 times): Str_replace: 0.109937906265 seconds STRTR: 0.0306839942932 seconds Comparison of replacement results For example: "Zhang San", "Zhang San Feng", "Zhangsanfungtan" are prohibited words (why there is such a distinction?) See also "FA x", "" FA xgong") " I'm driving Zhangsanfungtan to work today." strtr:" I'm going to work to

ASP Improved version MD5, SHA256 multiple encryption Class (two times and many times) _ Application Skills

At present, it can be realized: MD5 algorithm, SHA256 algorithm, first MD5 SHA256, SHA256 after MD5, two MD5, two times SHA256, 8-bit MD5 algorithm after the first 8-bit SHA256, 8-bit SHA256 algorithm after the former 8-bit MD5 algorithm, Password the last character of the ASCW value and the remainder of 8 as the encryption scheme coefficient, 16-bit MD5 encryption, 32-bit MD5 encryption, 8-bit SHA256 encryption, 16-bit SHA256 encryption, 24-bit SHA25

Hihocoder #1077: RMQ Problem-segment Tree (segment tree: structure build + update leaves upwards + query + cleverly use father[]+ segment tree array to open 4 times times * "Template")

weight of each commodity, where the I integer represents the weight of the commodity labeled I weight_i.The 3rd behavior of each set of test data is an integer q, which indicates the sum of the number of times that a small hi has been queried and the number of times the weight of the product has been changed.Each group of test data n+4~n+q+3 line, each line describes an operation, each line begins with a n

60 times times faster than MySQL Redis from getting started to mastering video tutorials

Tags: redis Mysql distributed databaseRedis is an open source API that is written in ANSI C, supports the web, can be persisted in memory, key-value databases, and provides multiple languages. Learning Video: HTTPS://PAN.BAIDU.COM/S/17NO3PG9HRL-RTU0BWATYLW Redis is also something that MySQL DBAs should be familiar with Redis is a high-performance Key-value database. The emergence of Redis, to a large extent, compensates for the lack of memcached such keyvalue storage, in some cases can be a good

Solve the problem that the Internet crashes when uploading files to the Internet from the Internet Explorer 9.

Why does the Internet Explorer crash when uploading files to the network? Since Vista, The UIPI (User Interface privilege isolation) security settings have been introduced and enabled by default, which may cause the above problems. We can try to disable UIPI to solve the problem: 1. Back up the registry key value Improper modification of the Registry may lead to other problems. We should back up the key values before making the changes. Press Win

This 48 Java technology points to increase your interview success rate by 5 times times!

serialization, what problems deserialization will encounter, and how to resolve it.Http://www.importnew.com/17964.htmlJVM knowledgeWhat happens when a stack memory overflow occurs.A Stackoverflowerror exception is thrown if the thread requests a stack depth that is greater than the depth allowed by the virtual machine. Throws a OutOfMemoryError exception if the virtual machine cannot request enough memory space in the dynamic expansion stack.Reference: http://wiki.jikexueyuan.com/project/java-v

MySQL Find project IDs for all project start times smaller than previous project end times

This is a previously encountered SQL interview problem, for reference learning:Find project IDs where all project start times are smaller than previous project end timesMysql> Select * fromT2;+----+---------------------+---------------------+|Id|Start| End |+----+---------------------+---------------------+| 1 | -- on- on xx:xx:xx | -- on- in xx:xx:xx || 2 | -- on- on xx:xx:xx | -- on- A xx:xx:xx || 3 | -- on-Geneva xx:xx:xx |

Find the odd number of times in an array where the number of other numbers appear even several times in an array where the number of odd occurrences

Find the number of odd times in an array with an even number of other numbers the public class oddnum{ //(1) array has only one number occurrences of the odd number of times public static void Get01 (Int[]arr) { int cur=0; for (int i=0;i

TCP three times handshake, four times goodbye

A picture explains clearly: Note that when you close the link, the Client\server is likely to be a server, as long as it is possible to establish a TCP link; Note:1: The fin was sent only to indicate that the end could not continue sending the data (the application layer could not call send sent), but it could also receive data; 2: four times to shake hands goodbye, sometimes the server's ACK, FIN will be sent at the same time, then the client has

Tips for making the Win7 taskbar four times times more space

As Windows 7 uses more time, it is becoming increasingly difficult to find a very awkward problem, with the taskbar space getting smaller. Because accustomed to the Windows 7 taskbar lock icon function, inadvertently put a variety of program icons into the taskbar up. Although we can use the taskbar small icon to alleviate the space problem, but the actual effect is not ideal, can save only about 20% of the space. Change the monitor to improve the resolution? But this will require additional cos

Let the Win7 taskbar have four times times the space

As Windows 7 uses more time, it is becoming increasingly difficult to find a very awkward problem, with the taskbar space getting smaller. Because accustomed to the Windows 7 taskbar lock icon function, inadvertently put a variety of program icons into the taskbar up. Although we can use the taskbar small icon to alleviate the space problem, but the actual effect is not ideal, can save only about 20% of the space. Change the monitor to improve the resolution? But this will require additional cos

"Turn" "How can the Internet subvert the market of traditional industries?" The vivid practice of Internet execution: a notebook of entrepreneurs born of "iteration" of a soft and hard combination product

Indo-American co-founder intoxicated Niuniu students think this is an excellent internet entrepreneurial process, touch the proper stone across the river, leading the entrepreneurial team to the other side of the victory. Look at the author's products: high-quality photo printing, just need to exist, but, where is the user just need? Is there a chance that existing customer relationships will be icing on the cake? How to motivate users to

The way of Internet cafes ' management: upgrading of Internet cafes

Just saw a news report said a couple eloped without a source of life, specifically stealing internet cafes computer, hey, suddenly remembered, a report that I saw a few times before, a 19-year-old boy in the Internet bar repeatedly steal planted, hey, often see such news, both headache and feel sorry!Often see the news reported that a host of

IMAP (Internet Mail access protocol,internet) is formerly known as the Interactive Mail Access Protocol (Interactive mail, Access Protocol).

POP3, the client is only connected to the server for a period of time until it downloads all the new information and the client disconnects. In IMAP, the client is connected to the server as long as the user interface is active and the download information content is needed. For users with many or very large messages, using the IMAP4 mode allows for faster response times. Enables multiple customers to connect to a single mailbox at the same time. The

China's internet needs anti-monopoly law (also on Internet innovation)

Recently heard that the first China's anti-monopoly law to be introduced, this is a good thing, at least for coexistence in the current economic environment of various forms of ownership, but also a fair competition, equitable development of good things, the introduction of this dongdong, is conducive to enterprise entrepreneurship and innovation. Yesterday, a friend in MSN Chat with me, talking about their own business disadvantage, feeling to the Chinese I

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