大约有 40,000 项符合查询结果（耗时：0.0501秒） [XML]
Surrogate vs. natural/business keys [closed]
...The primary key is used as a clustered index which determines the physical order of your data. In general, Integer is easy to balance since it increments sequentially and your data will append to the EOF on disk. If you use less sequential data such as text or GUID(UUID), there will be a lot more di...
Is gettimeofday() guaranteed to be of microsecond resolution?
...s the CPU's execution buffer
so that the timings aren't affected by out-of-order execution.
execute the rdtsc (read timestamp) execution. This fetches the number of
machine cycles executed since the processor was reset. This is a 64-bit
value, so with current CPU speeds it will wrap around every 1...
Is “IF” expensive?
...
At the very lowest level (in the hardware), yes, ifs are expensive. In order to understand why, you have to understand how pipelines work.
The current instruction to be executed is stored in something typically called the instruction pointer (IP) or program counter (PC); these terms are synonym...
How to debug Ruby scripts [closed]
...
with -rdebug :no need to change source file in order to debug
– germanlinux
Sep 23 '14 at 21:18
2
...
Use Fieldset Legend with bootstrap
...egend element to 100%. You can fix this by changing your legend.scheduler-border to also use:
legend.scheduler-border {
width:inherit; /* Or auto */
padding:0 10px; /* To give a bit of padding on the left and right */
border-bottom:none;
}
JSFiddle example.
You'll also need to ensure...
What is the point of Lookup?
...
Reading answers order is jwg -> bobbymcr -> jonskeet
– snr
Apr 18 at 21:59
...
ASP.NET MVC - Should business logic exist in controllers?
...s, skinny controllers.
For example, instead of having:
public interface IOrderService{
int CalculateTotal(Order order);
}
I would rather have:
public class Order{
int CalculateTotal(ITaxService service){...}
}
This assumes that tax is calculate by an external service, and requ...
Assignment inside lambda expression in Python
...
Order of elements may be important.
– MAnyKey
Mar 9 '16 at 6:02
add a comment
| ...
What is a “thread” (really)?
...struction Pointer (aka Program Counter), it controls what executes in what order. It also includes the Stack Pointer, which had better point to a unique area of memory for each thread or else they will interfere with each other.
Threads are the software unit affected by control flow (function call...
What does it mean for a data structure to be “intrusive”?
...ructure is one that requires help from the elements it intends to store in order to store them.
Let me reword that. When you put something into that data structure, that "something" becomes aware of the fact that it is in that data structure, in some way. Adding the element to the data structure ch...