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How to check if mysql database exists
...noying, imagine two threads trying to create the same database at the same time and what would happen if one failed. While it's not useful for determining if a database exists before trying to create it, it is useful for preventing collisions while multiple threads may be trying to create it.
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Learn C first before learning Objective-C [closed]
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Every now and then I see how they solve a problem entirely in Obj-C, sometimes resulting in a very clumsy solutions. Usually I then replace some Obj-C code with pure C code (after all you can mix them as much as you like, the content of an Obj-C method can be entirely, pure C code). Without any in...
How to reload the current state?
...terceptor somewhere that gets triggered. I've tested this solution several times and it works fine.
– M K
Sep 8 '14 at 7:55
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extract part of a string using bash/cut/split
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Friend, you don't know how many times I've come back to this answer. Thank you!
– Joel B
May 24 '18 at 22:51
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How do I find out which process is locking a file using .NET?
...;Process> of all processes that are locking that file.
using System.Runtime.InteropServices;
using System.Diagnostics;
using System;
using System.Collections.Generic;
static public class FileUtil
{
[StructLayout(LayoutKind.Sequential)]
struct RM_UNIQUE_PROCESS
{
public int d...
Hashset vs Treeset
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HashSet is much faster than TreeSet (constant-time versus log-time for most operations like add, remove and contains) but offers no ordering guarantees like TreeSet.
HashSet
the class offers constant time performance for the basic operations (add, remove, contains and...
Better explanation of when to use Imports/Depends
...library() is needed, and R won't notify you at the console at package load-time unless the Imported package cannot be found.
– Josh O'Brien
Dec 26 '11 at 20:32
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How is the undo tree used in Vim?
...e.
There are two ways to traverse the undo tree. One is to go "back in time". g+ and g- will traverse all of the nodes in the tree in chronological or reverse-chronological order (which can be a bit confusing, because it can jump arbitrarily between undo branches, but if you do g- long enough y...
MySQL high CPU usage [closed]
... MySQL Slow Query Log to keep an eye on any queries that are taking a long time, and use that to make sure you don't have any queries locking up key tables for too long.
Some other things you can check would be to run the following query while the CPU load is high:
SHOW PROCESSLIST;
This will sh...
How to change the cursor into a hand when a user hovers over a list item?
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In light of the passage of time, as people have mentioned, you can now safely just use:
li { cursor: pointer; }
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