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What is the meaning of the term arena in relation to memory?
I'm reading a book on memory as a programming concept. In one of the later chapters, the author makes heavy use of the word arena , but never defines it. I've searched for the meaning of the word and how it relates to memory, and found nothing. Here are a few contexts in which the author uses the...
Why is Dictionary preferred over Hashtable in C#?
...u also listed the similarities to lessen the questions that might comes to one's mind
– mkb
Mar 25 '16 at 12:23
stacko...
How to state in requirements.txt a direct github source
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The docs link was not working for me; I've used an older one.
– Sergey Orshanskiy
Dec 9 '13 at 0:11
43
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How do I enable TODO/FIXME/XXX task tags in Eclipse?
...ng those tags for as long as I've been using Eclipse and I have never seen one of them appear in the task list. Can anyone indicate how to enable this feature? I see no preferences option anywhere that says anything to the effect of 'Let my source code tags appear in the task list'. It would be a ni...
Why do == comparisons with Integer.valueOf(String) give different results for 127 and 128?
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@user3152527: There's a sizable difference - one is considered an object, which means you can call methods and interact with it in abstract data structures, like List. The other is a primitive, which is just a raw value.
– Makoto
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MySQL query String contains
...umn` LIKE '%{$needle}%'
");
The % is a wildcard for any characters set (none, one or many). Do note that this can get slow on very large datasets so if your database grows you'll need to use fulltext indices.
share
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Bash: Copy named files recursively, preserving folder structure
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I accepted this one for its elegance/memorability, but just discovered this doesn't copy whole directories (on OSX at least), whereas the tar one below does.
– mahemoff
Jul 23 '12 at 14:21
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Is there a performance difference between CTE , Sub-Query, Temporary Table or Table Variable?
... the same since both provide the same information to the query optimizer. One difference is that a CTE used more than once could be easily identified and calculated once. The results could then be stored and read multiple times. Unfortunately, SQL Server does not seem to take advantage of this ba...
Simple explanation of MapReduce?
... able to take 2 items, compute something and "reduce" that 2 items to just one single value, thus the program could reduce each pair until we have a single value.
the execution would follows:
result = 0
7 : result = result + 7 = 0 + 7 = 7
8 : result = result + 8 = 7 + 8 = 15
9 : result = result + ...
Foreign Key to multiple tables
...oup Ids and User Ids, so the foreign key only needs to be on the PartyId alone. Any queries written would still need to know the tables from the PartyTypeName anyway.
– Arin Taylor
Sep 18 '16 at 13:53
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