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Database cluster and load balancing
...lustering? If you allow the same database to be on 2 different servers how do they keep the data between synchronized. And how does this differ from load balancing from a database server perspective?
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How to get the command line args passed to a running process on unix/linux systems?
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This will do the trick:
xargs -0 < /proc/<pid>/cmdline
Without the xargs, there will be no spaces between the arguments, because they have been converted to NULs.
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Counting the number of elements with the values of x in a vector
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Don't forget about potential floating point issues, especially with table, which coerces numbers to strings.
– hadley
Dec 17 '09 at 18:10
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Debugging App When Launched by Push Notification
...n"
Now when you click debug from Xcode instead of launching the app a window will display telling it is waiting for the app to launch. You then launch the app normally on the phone and Xcode attaches to it
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Cannot use a CONTAINS or FREETEXT predicate on table or indexed view because it is not full-text ind
..._ProductDescriptionID
Before you create the index, make sure:
- you don't already have full-text search index on the table as only one full-text search index allowed on a table
- a unique index exists on the table. The index must be based on single-key column, that does not allow NULL.
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Creating JSON on the fly with JObject
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I get 'Newtonsoft.Json.Linq.JObject' does not contain a definition for 'Date' error when I try to run your code. The way I could make it work is change the first line to: dynamic jsonExpando = new ExpandoObject(); and add a line after your code: JObject jsonObje...
Array slicing in Ruby: explanation for illogical behaviour (taken from Rubykoans.com)
...e array. But there is no index 5, so you can't slice from there.
When you do index (like array[4]), you are pointing at elements themselves, so the indices only go from 0 to 3.
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Why does 2 == [2] in JavaScript?
...he number 2 to the string "2"; comparison between a string and a number is done by converting the string
– Christoph
Nov 12 '09 at 19:18
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Proxies with Python 'Requests' module
...s.get(url, headers=headers, proxies=proxyDict)
Deduced from the requests documentation:
Parameters:
method – method for the new Request object.
url – URL for the new Request object.
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proxies – (optional) Dictionary mapping protocol to the URL of the proxy.
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On linux...
Most pythonic way to delete a file which may not exist
...tion of overusing exceptions.
It may be worthwhile to write a function to do this for you:
import os, errno
def silentremove(filename):
try:
os.remove(filename)
except OSError as e: # this would be "except OSError, e:" before Python 2.6
if e.errno != errno.ENOENT: # errno....