大约有 42,000 项符合查询结果（耗时：0.0399秒） [XML]
Why are joins bad when considering scalability?
...atabase used well. There are a number of scalability-friendly ways to take raw joins and make them much faster:
Join on a surrogate key (autonumer/identity column) rather than a natural key. This means smaller (and therefore faster) comparisons during the join operation
Indexes
Materialized/indexed...
Convert Data URI to File then append to FormData
...ataURItoBlob(dataURI) {
// convert base64/URLEncoded data component to raw binary data held in a string
var byteString;
if (dataURI.split(',')[0].indexOf('base64') >= 0)
byteString = atob(dataURI.split(',')[1]);
else
byteString = unescape(dataURI.split(',')[1]);
...
Is it safe to push_back an element from the same vector?
...
__alloc_traits::construct(__a,
_VSTD::__to_raw_pointer(__v.__end_),
_VSTD::forward<_Up>(__x));
__v.__end_++;
// Moving existing elements happens here:
__swap_out_circular_buffer(__v);
// When __v goes out of scope, __x will b...
Differences between unique_ptr and shared_ptr [duplicate]
...
@AaronMcDaid By default unique_ptr will behave like a raw pointer that you can't forget to delete: if you forget to make the dtor virtual, it's on you.
– curiousguy
Jun 30 '18 at 18:00
...
An efficient way to transpose a file in Bash
...es an array for the input lines after parsing each line as JSON, and -r (--raw-output) outputs the contents of strings instead of JSON string literals. The / operator is overloaded to split strings.
share
|
...
What is the relative performance difference of if/else versus switch statement in Java?
...s which gives a much more performance gain than only (micro)optimizing the raw Java code.
share
|
improve this answer
|
follow
|
...
How to run a shell script in OS X by double-clicking?
...app file. My script includes a line where the user has to type some input (raw_input()), when the .app reaches this line of code, it throws an EOF (end of file) error. What can I do about it?
– user2015601
Apr 3 '13 at 22:25
...
How to use Sublime over SSH
...stall the 'subl' shell command):
sudo wget -O /usr/local/bin/subl https://raw.github.com/aurora/rmate/master/rmate; sudo chmod +x /usr/local/bin/subl
And voila! You're now using Sublime Text over SSH.
You can open an example file in Sublime Text from the server with something like subl ~/test.t...
Replace part of a string with another string
...
Raw string allows to write R"(\$name)" instead of "\\$name".
– Jarod42
Jul 22 '16 at 12:30
4
...
How much faster is Redis than mongoDB?
...will analyze the performance of the machine you are on. There is a ton of raw data from it at the Benchmark wiki for Redis. But you might have to look around a bit for Mongo. Like here, here, and some random polish numbers (but it gives you a starting point for running some MongoDB benchmarks yours...