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How does database indexing work? [closed]
...ace on the disk since the indices are stored together in a table using the MyISAM engine, this file can quickly reach the size limits of the underlying file system if many fields within the same table are indexed.
How does it work?
Firstly, let’s outline a sample database table schema;
Field ...
Homebrew install specific version of formula?
... postgresql@8.4.4 See answer below for more details.
*(I’ve re-edited my answer to give a more thorough workflow for installing/using older software versions with homebrew. Feel free to add a note if you found the old version better.)
Let’s start with the simplest case:
1) Check, whether th...
List of ANSI color escape sequences
...retations forget the color space Id in the 2 (16M-color RGB)/3 (16M-color CMY) /4 (??? CMYK) forms - e.g. it should be \033[38:2::255:255:255m for a White 16M foreground and not \033[38:2:255:255:255m !
– SlySven
Dec 19 '18 at 23:37
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Is Java “pass-by-reference” or “pass-by-value”?
...
I just noticed you referenced my article.
The Java Spec says that everything in Java is pass-by-value. There is no such thing as "pass-by-reference" in Java.
The key to understanding this is that something like
Dog myDog;
is not a Dog; it's actually ...
How much of a git sha is *generally* considered necessary to uniquely identify a change in a given c
...rt=4 921103db8259eb9de72f42db8b939895f5651489
92110
As you can see in my example the SHA1 has a length of 5 even if I specified a length of 4.
For big repos, 7 isn't enough since 2010, and commit dce9648 by Linus Torvalds himself (git 1.7.4.4, Oct 2010):
The default of 7 comes from fair...
When should one use a spinlock instead of mutex?
...lticore systems (and also time slicing, yet irrelevant for what I wrote in my reply); also you entirely missed the point on what a hybrid spinlock is and why it works well on single and multicore systems.
– Mecki
Apr 9 '14 at 13:42
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What does Ruby have that Python doesn't, and vice versa?
... @Glenn Check out the SO FAQ section "Other people can edit my stuff?!" - this is a Community Wiki.
– bias
Jun 12 '10 at 20:18
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Need some clarification about beta/alpha testing on the developer console
... people who were lucky enough to install the previous version?
As far as my experience goes, i have seen people who were testers get the update for the app first than everyone else. But i am not so sure about how does it work exactly.
Hope this helps.
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How does LMAX's disruptor pattern work?
...are kind of hard to explain and Trisha's blog has done the best attempt in my opinion with this post: http://mechanitis.blogspot.com/2011/08/dissecting-disruptor-why-its-so-fast.html
But if you don't want to dive into the low-level details you can just know that memory-barriers in Java are implemen...
Patterns for handling batch operations in REST web services?
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Thanks. That's very similar to my ideas on how I would go forward if we kept the batch operations on the client. The issue is the round-trip time for performing an operation on a large number of objects.
– Mark Renouf
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