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Fastest way to count exact number of rows in a very large table?
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Simple answer:
Database vendor independent solution = use the standard = COUNT(*)
There are approximate SQL Server solutions but don't use COUNT(*) = out of scope
Notes:
COUNT(1) = COUNT(*) = COUNT(PrimaryKey) just in case
Edit:
SQL Server example...
Context switches much slower in new linux kernels
...ion to the bad thread wake up performance problem in recent kernels has to do with the switch to the intel_idle cpuidle driver from acpi_idle, the driver used in older kernels. Sadly, the intel_idle driver ignores the user's BIOS configuration for the C-states and dances to its own tune. In other wo...
When to use static classes in C# [duplicate]
... be filled in as well... Had we created a class with the single purpose of doing what this static method did, we could solve this by taking in the required parameters in the constructor, and allowing the user to set optional values through properties, or methods to set multiple interdependent values...
How do you return from 'gf' in Vim
I am using Vim for windows installed in Unix mode. Thanks to this site I now use the gf command to go to a file under the cursor.
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How to correct indentation in IntelliJ
...e comments are also indented to the same level as the code, you can simply do as follows:
(example for JavaScript)
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How do I import the Django DoesNotExist exception?
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You don't need to import it - as you've already correctly written, DoesNotExist is a property of the model itself, in this case Answer.
Your problem is that you are calling the get method - which raises the exception - before it...
is it possible to change values of the array when doing foreach in javascript?
...f that second argument is not provided.
(Note: the above stuff about this does not apply if the callback is a => function, because this is never bound to anything when such functions are invoked.)
Also it's important to remember that there is a whole family of similar utilities provided on the ...
Hidden features of Perl?
...eric language features in Perl that you've actually been able to employ to do useful work?
78 Answers
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erb, haml or slim: which one do you suggest? And why? [closed]
...is good mainly if you have a web designer that will work on plain HTML and does not know either haml or slim. This way he can write HTML and you can embed ruby logic with the proper tags.
If you work on both HTML and ruby logic, or your designer is ready to learn something new (like HAML) I'd go fo...
Do Google refresh tokens expire?
...thorized) when the user revokes access to your application.
Refer this doc it clearly states the function of refresh tokens.
Instead of issuing a long lasting token (typically good for a year or unlimited lifetime),
the server can issues a short-lived access token and a long lived re...