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Can someone explain in simple terms to me what a directed acyclic graph is?
... Andriyev, +1 for the deadlock example. This is in fact used by MySQL's InnoDB engine, and they call it a "wait-for-graph", as in, "that row has to wait for the lock on that row to be released"
– Roland Bouman
Feb 17 '10 at 19:40
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How to restart Jenkins manually?
...e it makes your service unreliable as it picks up the environment from the root user as opposed to a clean reliable blank environment that is set by the init launchers (service / systemctl).
– battey
Nov 8 '19 at 23:04
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How to use 'find' to search for files created on a specific date? [closed]
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You could do this:
find ./ -type f -ls |grep '10 Sep'
Example:
[root@pbx etc]# find /var/ -type f -ls | grep "Dec 24"
791235 4 -rw-r--r-- 1 root root 29 Dec 24 03:24 /var/lib/prelink/full
798227 288 -rw-r--r-- 1 root root 292323 Dec 24 23:53 /var/log/sa/sar...
How to do an update + join in PostgreSQL?
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coming from mysql it's unintuitive that the same join used for select won't also update just by adding a set phrase :( still - the syntax for this is probably easier for a newcomer to sql to master.
– WEBjuju
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How do I create a URL shortener?
...Take an auto-generated, unique numerical key (the auto-incremented id of a MySQL table for example).
For this example, I will use 12510 (125 with a base of 10).
Now you have to convert 12510 to X62 (base 62).
12510 = 2×621 + 1×620 = [2,1]
This requires the use of integer division and modulo. A ...
In C# check that filename is *possibly* valid (not that it exists) [duplicate]
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I enhanced this solution using bOk = System.IO.Path.IsPathRooted(fileName); instead of bOk = true;
– jing
Sep 24 '13 at 7:12
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How to use greater than operator with date?
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It bears noting that MySQL seems a bit picky about the date format; while either 2019/02/08 21:04:07 or 2019-02-08 21:04:07 produces the expected outcome, 02-08-2019 21:04:07, using the US date format, casts a much wider net.
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John Carmack's Unusual Fast Inverse Square Root (Quake III)
... function in the Quake III source code which calculates the inverse square root of a float, 4x faster than regular (float)(1.0/sqrt(x)) , including a strange 0x5f3759df constant. See the code below. Can someone explain line by line what exactly is going on here and why this works so much faster t...
Nginx 403 forbidden for all files
...dn't also require x permission on parent directories is if it's running as root.
– kolbyjack
May 23 '14 at 12:46
I end...
Absolute vs relative URLs
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@Mike why would you call root-relative URLs ‘absolute’?
– törzsmókus
Mar 22 '15 at 8:51
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