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SEARCH KEYWORD -- Efficiency



  How to optimize MySQL insert statement


For a big data system, one problem is the data access efficiency, one more problem is that the data insertion is very slow. We had a service system, the data loading process would take 4-5 hours. This time consuming operation is risky since if the program is interrupted during the loading process, it might be rerun, this will be troublesome. So it's necessary to improve the insertion efficiency for big data systems. Here we provide two optimization suggestions. 1. Combine multiple insert stateme...

   MySQL,insert,optimization     2012-10-24 22:03:13


  Arrays.equals() vs MessageDigest.isEqual()


Both Arrays.equals() and MessageDigest.isEqual() are used to compare the equality of two arrays. They can be interchangeably in many cases. However, they do have some differences which lead to different use cases in real applications. One difference is that the arrays passed to MessageDigest.isEqual() cannot be null while it's ok for Arrays.equals(). The one major difference between these two methods is that Arrays.equals() is not time-constant while MessageDigest.isEqual() is time-constant. Thi...

   Arrays.equal(),MessageDigest.isEqual(),Java,Security     2015-05-14 22:03:29


  Sustainability


When I was in business school 25 years ago, I don't recall the term sustainability used. Maybe it was, but it certainly didn't register in my brain. The mantras that I recall were return on investment, shareholder value, revenue growth, and driving efficiencies in the business.But as I look at many of the challenges facing businesses today, it seems to me that the focus on performance and efficiency often comes at the cost of sustainability. This talk by Clay Christensen really drives that point...

   Sustainability,Productivity,Efficiency     2011-11-21 10:07:16


  Tips for improving PHP efficiency


0. Using single quote to replace double quote to enclose string literal, this will be a bit faster. Because PHP engine will search variables in double quoted string. 1. If a method in class can be declared as static, then make it static, this will be 4 times faster. 2. $row["id"] is 7 times faster than $row[id] 3. echo is faster than print, and you should use multiple parameters instead of string concatenation, i.e use comma(,) instead of dot(.) to concatenate string. For example echo $str1,$str...

   PHP, efficiency, tips     2012-10-01 19:39:06


  Silicon Valley engineers have something to say about work from home


Quitting from Google and joined Yahoo which was thought as a declining giant, Marissa Mayer has been trying to prove that she has the ability to lead this Internet giant to reverse the decline. In order to boost the low morale of the employees, Meyer tried to transplant Google's work culture to Yahoo with office decoration, free lunch and issuance of smart phones, these generous measures let her win the applause of the Silicon Valley.But a recent ban issued by Meyer has attracted a lot of contro...

   Work from home,Yahoo, Marissa Mayer     2013-03-07 02:39:23


  How GitHub Works: Hours are Bullshit


Frederick Winslow Taylor wrote the seminal analysis of management and efficiency in 1911 with The Principles of Scientific Management. He took the first scientific approach towards maximizing efficiency in manufacturing jobs. Time is money. Faster is better. More hours are better. Hours are bullshit Hours are great ways to determine productivity in many industries, but not ours. Working in a startup is a much different experience than working in a factory. You can’t throw more time at a prob...

   Work,Style,Time,Efficiency,Code,Enforcem     2011-08-19 07:42:32


  It’s Not China; It’s Efficiency That Is Killing Our Jobs


The majority of wealth is now concentrated at the top of the social ladder. This is particularly true in the US, and the gap is widening every year. This, I believe, is because of efficiency, not China. Today the best ideas can efficiently and quickly propagate worldwide, and everyone can efficiently find them and buy them. This makes the owners of these ideas filthy rich, and those ideas that are not the best, can hardly survive. It’s not just transfer of information that is fast; wealth too ...

   China,Efficiency,Job,Opportunity,Wealth     2011-10-23 11:43:18


  JavaScript efficiency catch up


JavaScript is a very flexible language, we can write JavaScript code freely with various styles, different kinds of codes will have different execution efficiency. Here we summarize some tips we get from our development. Efficiency of JavaScript itself JavaScript has execution context chain, closures, prototype inheritance, eval etc. It brings us some magic features, but it also introduces the performance issue, if we don't use them properly, it will affect the codes execution efficiency. 1. Glo...

   JavaScript,efficiency,event delegation,eval     2013-04-02 04:08:46


  6 time management tips for startups


Many people are fighting for their startups, they are willing to put all their time in company operations. This 24x7 passion is necessary for startup founders. For the team in startups, the most important thing is time management, time management is a top challenge for everyentrepreneur. After years of experience working with entrepreneurs and business owners, Rieva Lesonsky has  learned a few tricks for getting more done in the 24 hours we all have. Here are 6 tips what he shared...

   startup,time management     2012-05-29 05:30:07


  How Many Hours Can a Programmer Program?


I am a little late to this party where Michael Arrington says that startups mean working hard and sleeping under your desk. But I will add a few words. I read a lot of commentary about how such death marches can be counter-productive and ultimately unsuccessful, and also the real dangers they pose to the well-being (short-term and long-term) of the lives of the programmers. But I didn’t see many people actually do a quantitative analysis. So here it is. Your average working day is 8...

   Programmer,Working hour,Efficiency     2012-01-28 07:17:17