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What is the difference between Google App Engine and Google Compute Engine?
...fferent events, which may include HTTP requests, changes in Cloud Storage, etc.
The biggest difference with App Engine is that functions are priced per 100 milliseconds, while App Engine's instances shut down only after 15 minutes of inactivity. Another advantage is that Cloud Functions execute imm...
How can I select rows with most recent timestamp for each key value?
...SELECT MAX(timestamp) FROM sensorTable s2 WHERE s1.sensorID = s2.sensorID)
ORDER BY sensorID, timestamp;
Pretty self-explaining I think, but here's more info if you wish, as well as other examples. It's from the MySQL manual, but above query works with every RDBMS (implementing the sql'92 standard...
How to restart Jenkins manually?
... RestartNotSupportedException in Jenkins 1.532.1 with IcedTea 2.3.9. sudo /etc/init.d/jenkins restart worked for me though.
– Matthias Braun
Feb 5 '14 at 18:57
4
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How to set Oracle's Java as the default Java in Ubuntu?
...nvironment variables globally and at system level means use should set in /etc/environment file.
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Rank items in an array using Python/NumPy, without sorting array twice
...
Use argsort twice, first to obtain the order of the array, then to obtain ranking:
array = numpy.array([4,2,7,1])
order = array.argsort()
ranks = order.argsort()
When dealing with 2D (or higher dimensional) arrays, be sure to pass an axis argument to argsort to...
Why not be dependently typed?
...s due to the fact that dependent types are fundamentally hard (e.g., first-order logic is undecidable). But I think the bigger problem is really that we lack a good vocabulary for capturing and explaining what's going on. As more and more people learn about dependent types, we'll develop a better vo...
Understanding the meaning of the term and the concept - RAII (Resource Acquisition is Initialization
...e same way in C# by replacing synchronized with lock):
void foo()
{
// etc.
synchronized(someObject)
{
// if something throws here, the lock on someObject will
// be unlocked
}
// etc.
}
... is already using RAII: The mutex acquisition is done in the keyword (synchron...
What is an example of the simplest possible Socket.io example?
.../title>
<style>
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font: 13px Helvetica, Arial; }
form { background: #000; padding: 3px; position: fixed; bottom: 0; width: 100%; }
form input { border: 0; padding: 10px; width: 90%; margin-right: .5%; }
...
Entity Framework Code First - two Foreign Keys from same table
...
public int MatchId { get; set; }
[ForeignKey("HomeTeam"), Column(Order = 0)]
public int? HomeTeamId { get; set; }
[ForeignKey("GuestTeam"), Column(Order = 1)]
public int? GuestTeamId { get; set; }
public float HomePoints { get; set; }
public float GuestPoints { get; se...
Composite Key with EF 4.1 Code First
...uld work - composite key defined with annotations requires explicit column order:
public class ActivityType
{
[Key, Column(Order = 0)]
public int ActivityID { get; set; }
[Key, Column(Order = 1)]
[Required(ErrorMessage = "A ActivityName is required")]
[StringLength(50, ErrorMes...