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What are the First and Second Level caches in Hibernate?
Can anyone explain in simple words what First and Second Level caching in Hibernate are?
7 Answers
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@UniqueConstraint and @Column(unique = true) in hibernate annotation
What is difference between @UniqueConstraint and @Column(unique = true) ?
4 Answers
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What is the meaning of “non temporal” memory accesses in x86
...to be seen by other processors in a timely fashion.
When data is produced and not (immediately) consumed again, the fact that memory store operations read a full cache line first and then modify the cached data is detrimental to performance. This operation pushes data out of the caches which might ...
JavaScript by reference vs. by value [duplicate]
...omprehensive reading material on when JavaScript passes something by value and when by reference and when modifying a passed item affects the value outside a function and when not. I'm also interested in when assigning to another variable is by reference vs. by value and whether that follows any di...
Download a single folder or directory from a GitHub repo
...s://github.com/lodash/lodash/trunk/test
Download the folder. Go to the command line and grab the folder with SVN.
svn checkout https://github.com/lodash/lodash/trunk/test
You might not see any activity immediately because Github takes up to 30 seconds to convert larger repositories, so be patie...
App.Config Transformation for projects which are not Web Projects in Visual Studio?
...for any XML configuration file.
You can right-click on your web.config and click "Add Config
Transforms." When you do this, you'll get a web.debug.config and a
web.release.config. You can make a web.whatever.config if you like, as
long as the name lines up with a configuration profile. The...
What to do about Eclipse's “No repository found containing: …” error messages?
...n Linux to which I added the subversive plugins, the m2e Maven integration and the Mylin connector for Trac. For the last couple of weeks I've been trying to install updates, and every time I get back a message like
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Using group by on multiple columns
I understand the point of GROUP BY x .
2 Answers
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Is 'switch' faster than 'if'?
...ntly increase performance in some scenarios, is as general as a switch is, and does not result in greater generated code size. But to see that, your test code would need a LOT more branches to see any difference.
To answer your specific questions:
Clang generates one that looks like this:
test_s...
How to select the nth row in a SQL database table?
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There are ways of doing this in optional parts of the standard, but a lot of databases support their own way of doing it.
A really good site that talks about this and other things is http://troels.arvin.dk/db/rdbms/#select-limit.
Basically, PostgreSQL and MySQL supports the non-...