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Transaction isolation levels relation with locks on table
...(yes, two tables can be logically but not physically related in real-world apps =\).
READ COMMITTED - lock on committed data. You can read the data that was only committed. This means A writes data and B can't read the data saved by A until A executes a commit. The problem here is that C can update ...
Lock-free multi-threading is for real threading experts
...struction is earlier in your code, it does not mean that it will actually happen earlier. CPUs can process instructions out of order: and they especially like to do this to instructions with memory accesses, to hide main memory latency and make better use of their cache.
Now, it is sure against int...
Ternary operator is twice as slow as an if-else block?
...nothing to 'fix' about the ternary operator. it's usage in this case just happens to cause a different register allocation. In a different case, it might be faster than if/else, as I tried to explain in my answer.
– Eren Ersönmez
Jun 27 '13 at 12:41
...
Do sessions really violate RESTfulness?
...
First, let's define some terms:
RESTful:
One can characterise applications conforming to the REST constraints
described in this section as "RESTful".[15] If a service violates any
of the required constraints, it cannot be considered RESTful.
according to wikipedia.
stateless const...
How do you parse and process HTML/XML in PHP?
... XMLReader and XMLWriter classes to create a simple "xml to object/array" mapping system and design pattern. Writing and reading XML is single-pass and can therefore be fast and require low memory on large xml files.
FluidXML
FluidXML is a PHP library for manipulating XML with a concise and fl...
What's the difference between utf8_general_ci and utf8_unicode_ci?
...justify the performance cost. Today, that performance cost has all but disappeared, and developers are treating internationalization more seriously.
There's an argument to be made that if speed is more important to you than accuracy, you may as well not do any sorting at all. It's trivial to make ...
Where are my postgres *.conf files?
...t PostgreSQL. See pg_clt -D, check postgresql.org/docs/current/interactive/app-pg-ctl.html
– Frank Heikens
Sep 1 '10 at 9:51
3
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How do I list all files of a directory?
...:
import glob
txtfiles = []
for file in glob.glob("*.txt"):
txtfiles.append(file)
glob with list comprehension
import glob
mylist = [f for f in glob.glob("*.txt")]
glob with a function
The function returns a list of the given extension (.txt, .docx ecc.) in the argument
import ...
Is there a list of screen resolutions for all Android based phones and tablets? [closed]
...ns are :
1280*800
1280*768
1024*600
1024*800
1024*768
800*400
800*480
Happy designing .. ! :)
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How do I uniquely identify computers visiting my web site?
...rowser fingerprinting poses in practice,
and what countermeasures may be appropriate to prevent it. There is a
tradeoff between protection against fingerprintability and certain kinds of
debuggability, which in current browsers is weighted heavily against privacy. Paradoxically, anti-fingerpri...