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What is sharding and why is it important?
...y, rather than splitting by columns (as for normalization). Each partition forms part of a shard, which may in turn be located on a separate database server or physical location. The advantage is the number of rows in each table is reduced (this reduces index size, thus improves search performance)....
Reverting a single file to a previous version in git [duplicate]
...ant to revert just one of the files, you can use git reset (the 2nd or 3rd form):
git reset a4r9593432 -- path/to/file.txt
# the reverted state is added to the staging area, ready for commit
git diff --cached path/to/file.txt # view the changes
git commit
git checkout HEAD path/to/file.txt ...
“Inner exception” (with traceback) in Python?
...s thrown I typically want to wrap it in another exception that adds more information, while still showing the full stack trace. It's quite easy in C#, but how do I do it in Python?
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Is it possible to hide extension resources in the Chrome web inspector network tab?
...us, incognito windows won't remember any login details or autocomplete any form inputs, both of which are features I really need when testing web interfaces. You can stop any extension resources appearing easily enough by just creating a fresh user profile with no extensions installed (and you'll s...
How to make an HTTP POST web request
...
There are several ways to perform HTTP GET and POST requests:
Method A: HttpClient (Preferred)
Available in: .NET Framework 4.5+, .NET Standard 1.1+, .NET Core 1.0+ .
It is currently the preferred approach, and is asynchronous and high performance. ...
What are the main disadvantages of Java Server Faces 2.0?
...as the initial release. It was cluttered with bugs in both the core and performance areas you don't want to know about. Your webapplication didn't always work as you'd intuitively expect. You as developer would run hard away crying.
JSF 1.1 (May 2004)
This was the bugfix release. The performance w...
Difference between return and exit in Bash functions
...tly executed foreground pipeline." That exit may be from the shell in the form of a call to exit (or hitting the end of the script) or in the form of a call to return within a function.
– SiegeX
Dec 12 '10 at 1:58
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How to loop through a HashMap in JSP?
...t;c:forEach items="${partnerTypesMap}" var="partnerTypesMap">
<form:option value="${partnerTypesMap['value']}">${partnerTypesMap['key']}</form:option>
</c:forEach>
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SQLite - UPSERT *not* INSERT or REPLACE
...author
FROM new LEFT JOIN page AS old ON new.name = old.name;
The exact form of this query can vary a bit. The key is the use of INSERT SELECT with a left outer join, to join an existing row to the new values.
Here, if a row did not previously exist, old.id will be NULL and SQLite will then assi...
Why do we need entity objects? [closed]
...ated with) the SQL, and your code is stored inside the database. Boosts performance by avoiding network roundtrips. And encapsulates your business logic regardless of which client connects to the database.
– ObiWanKenobi
Dec 15 '10 at 14:27
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