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Why does direction of index matter in MongoDB?
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MongoDB concatenates the compound key in some way and uses it as the key in a BTree.
When finding single items - The order of the nodes in the tree is irrelevant.
If you are returning a range of nodes - The elements close to each other will be dow...
Is REST DELETE really idempotent?
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Idempotence refers to the state of the system after the request has completed
In all cases (apart from the error issues - see below), the account no longer exists.
From here
"Methods can also have the property of
"idempotence" in that (aside from
error or expiration issues) the
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What's the (hidden) cost of Scala's lazy val?
...e (rather than bytecode):
class LazyTest {
lazy val msg = "Lazy"
}
is compiled to something equivalent to the following Java code:
class LazyTest {
public int bitmap$0;
private String msg;
public String msg() {
if ((bitmap$0 & 1) == 0) {
synchronized (this) {
...
How do I programmatically shut down an instance of ExpressJS for testing?
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when testing server, check out github.com/visionmedia/supertest it will let you test w/o launching actual server
– Lukas Liesis
Nov 1 '16 at 13:54
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Can a project have multiple origins?
... a remote called "github" instead:
$ git remote add github https://github.com/Company_Name/repository_name.git
# push master to github
$ git push github master
# Push my-branch to github and set it to track github/my-branch
$ git push -u github my-branch
# Make some existing branch track github ...
How does facebook, gmail send the real time notification?
I have read some posts about this topic and the answers are comet, reverse ajax, http streaming, server push, etc.
5 Answer...
Why is a “GRANT USAGE” created the first time I grant a user privileges?
...you can not authenticate. An user with USAGE privilege can run certain SQL commands like 'select 1+1' and 'show processlist'.
– Mircea Vutcovici
Feb 26 '15 at 16:10
add a comm...
Do C# Timers elapse on a separate thread?
... edited May 23 '17 at 11:55
Community♦
111 silver badge
answered Sep 16 '09 at 22:43
JorenJoren
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Static function variables in Swift
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