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How to “EXPIRE” the “HSET” child key in redis?
...se. This allows all those keys to fall in the same hash slot. You can read more about it here: https://redis.io/topics/cluster-tutorial
Now if we want to do the same operation of hashes, we could do:
HDEL hash_top_key child_key_1 => DEL {hash_top_key}child_key_1
HGET hash_top_key child_key_1 =...
How do I split a string so I can access item x?
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How to check if a column exists in a SQL Server table?
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A more concise version
IF COL_LENGTH('table_name','column_name') IS NULL
BEGIN
/* Column does not exist or caller does not have permission to view the object */
END
The point about permissions on viewing metadata applies to ...
Joins are for lazy people?
...n.
Edit: There are some rare cases where custom client code can do things more efficiently than a straightforward DB join (see comment by meriton). But this is very much the exception.
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impr...
Java equivalent of C#'s verbatim strings with @
... i love c# 6 with @"string" and $"string{i}" and very futures more than java
– Guido Mocha
May 11 '17 at 7:39
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How do you change the server header returned by nginx?
...n, replacing Nginx's standard HttpHeadersModule with the forked HttpHeadersMoreModule. Recompiling the standard module is still the quick fix, and makes sense if you want to use the standard module and won't be changing the server string often. But if you want more than that, the HttpHeadersMoreModu...
Copying files using rsync from remote server to local machine
...e so /path/to/local/storage/copy. If that's what you want great. However a more common scenario is you want to copy the contents of the remote directory into a directory in your local. Then you would do /path/to/copy/ which would place the contents inside the directory /path/to/local/storage without...
Lock, mutex, semaphore… what's the difference?
... number of cpu, io or ram intensive tasks running at the same time.
For a more detailed post about the differences between mutex and semaphore read here.
You also have read/write locks that allows either unlimited number of readers or 1 writer at any given time.
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Loop through an array of strings in Bash?
...problem with this approach? In simple cases it seems to work and, then, is more intuitive than @anubhava's answer.
– Dr. Jan-Philip Gehrcke
Aug 30 '12 at 11:54
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How do I force a favicon refresh?
...at all, but not my new one. I do not think this is a Grails issue per se, more an issue with favicons.
31 Answers
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