Efficient way to do batch INSERTS with JDBC
This is a mix of the two previous answers:
performance
Best way to test if a row exists in a MySQL table
You could also try EXISTS: and per the documentation, you can SELECT anything. Traditionally, an EXISTS subquery starts with SELECT *, but it could begin with SELECT 5 or SELECT column1 or anything at all. MySQL ignores the SELECT list in such a subquery, so it makes no difference.
Make first letter of a string upper case (with maximum performance)
Solution in different C# versions C# 8 with at least .NET Core 3.0 or .NET Standard 2.1 Since .NET Core 3.0 / .NET Standard 2.1 String.Concat() supports ReadonlySpan<char> which saves one allocation if we use .AsSpan(1) instead of .Substring(1). C# 8 C# 7 Really old answers This version is shorter. For a faster solution, take a look at Diego’s answer. Probably the fastest … Read more
Fastest way to remove first char in a String
The second option really isn’t the same as the others – if the string is “///foo” it will become “foo” instead of “//foo”. The first option needs a bit more work to understand than the third – I would view the Substring option as the most common and readable. (Obviously each of them as an individual statement … Read more
ADB stopping at (waiting for devices)
the only reason for this is that your PC is not recognizing Phone.which is a driver problem. You have to understand a few things before starting with the solution. you may know this too. when you are in your recovery adb gets into something like recovery mode(just framing some terms myself) in bootloader, it takes … Read more
When should we use Radix sort?
Radix sort is harder to generalize than most other sorting algorithms. It requires fixed size keys, and some standard way of breaking the keys into pieces. Thus it never finds its way into libraries.
Is Python faster and lighter than C++?
I think you’re reading those stats incorrectly. They show that Python is up to about 400 times slower than C++ and with the exception of a single case, Python is more of a memory hog. When it comes to source size though, Python wins flat out. My experiences with Python show the same definite trend … Read more
How to get current time in milliseconds?
Simply use std::chrono. The general example below times the task “of printing 1000 stars”: Instead of printing the stars, you will place your sorting algorithm there and time measure it. Do not forget to enable the optimization flags for your compiler, if you intend to do some benchmarking, e.g. for g++, you need -O3. This is serious, check … Read more
Static linking vs dynamic linking
Dynamic linking can reduce total resource consumption (if more than one process shares the same library (including the version in “the same”, of course)). I believe this is the argument that drives it its presence in most environments. Here “resources” includes disk space, RAM, and cache space. Of course, if your dynamic linker is insufficiently flexible there is … Read more