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Multithreading: What is the point of more threads than cores?
...separate lines of execution at once. In an 'ideal' system, you would have one thread executing per core: no interruption. In reality this isn't the case. Even if you have four cores and four working threads, your process and it threads will constantly be being switched out for other processes and...
Hibernate openSession() vs getCurrentSession()
...nSession() always opens a new session that you have to close once you are done with the operations. SessionFactory.getCurrentSession() returns a session bound to a context - you don't need to close this.
If you are using Spring or EJBs to manage transactions you can configure them to open / close s...
Heroku 'Permission denied (publickey) fatal: Could not read from remote repository' woes
...ed up nothing, it's that my search turned up so many different solutions -none of which have worked.
14 Answers
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How to make Regular expression into non-greedy?
...ely following them:
* - zero or more
*? - zero or more (non-greedy)
+ - one or more
+? - one or more (non-greedy)
? - zero or one
?? - zero or one (non-greedy)
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When NOT to use Cassandra?
...st fitting solution for that problem.
I will try to answer your questions one by one in the same order you asked them. Since Cassandra is based on the NoSQL family of databases, it's important you understand why use a NoSQL database before I answer your questions.
Why use NoSQL
In the case of RDB...
Why there can be only one TIMESTAMP column with CURRENT_TIMESTAMP in DEFAULT clause?
Why there can be only one TIMESTAMP column with CURRENT_TIMESTAMP in DEFAULT or ON UPDATE clause?
9 Answers
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Match all elements having class name starting with a specific string [duplicate]
...ute selector is just like any other selector (it can be used as a "stand alone"). It is no different that .myClass potentially being used with div.myClass instead. The attribute selector can stand alone (matching any elements that meet that criteria) or be narrowed to specific element. So don't worr...
What's the difference between INNER JOIN, LEFT JOIN, RIGHT JOIN and FULL JOIN? [duplicate]
...SQL SERVER – Better Performance – LEFT JOIN or NOT IN?.
Find original one at: Difference between JOIN and OUTER JOIN in MySQL.
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Difference between jQuery parent(), parents() and closest() functions
...ree. Begins from the current element and travels up.
parent() selects one element up (single level up) the DOM tree.
parents() method is similar to parent() but selects all the
matching elements up the DOM tree. Begins from the parent element and travels up.
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With Mercurial, how can I “compress” a series of changesets into one before pushing?
...y. Now, I start working on a feature. I work on it, and when I think it's done, I commit the changeset. Testing it a bit more, I find that I could further improve this feature by tweaking something in the code. I make the change and commit. 20 minutes later, I find there's a bug in this new feature,...