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Lost connection to MySQL server at 'reading initial communication packet', system error: 0
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I had this problem and it ended up being the prior sys admin changed the port MySQL was running on. MySQL Workbench was trying to connect to the default 3306 but the server was running on 20300.
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理解和配置 Linux 下的 OOM Killer - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
... * implementation used by LSMs.
*/
if (has_capability_noaudit(p, CAP_SYS_ADMIN))
adj -= 30;
/* Normalize to oom_score_adj units */
adj *= totalpages / 1000;
points += adj;
/*
* Never return 0 for an eligible task regardless of the root bonus and
* oom_score_adj (oom_score_...
Best way to store time (hh:mm) in a database
.... Why spend extra time writing code that loads an int, manipulates it, and converts it into a datetime, when you could just load a datetime?
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In C#, why is String a reference type that behaves like a value type?
...rence, rather than primitive, type. Plus, if string were a value type then converting it to object would require it to be boxed, a needless inefficiency).
– Qwertie
Jun 25 '10 at 15:50
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Summarizing multiple columns with dplyr? [duplicate]
...le(1:5, 10, replace=T),
grp = sample(1:3, 10, replace=T))
# Convert to tidy format using gather
df %>%
gather(key = variable, value = value, a:d) %>%
group_by(grp, variable) %>%
summarize(mean = mean(value)) %>%
spread(variable, mean)
#> Source: local da...
Java 256-bit AES Password-Based Encryption
...ecretKey secret = null;
// since we pass it as a string of input, convert to a actual byte buffer here
mSalt = Hex.decodeHex (salt.toCharArray ());
Db ("got salt " + Hex.encodeHexString (mSalt));
// get initialization vector from passed string
mInitVec = Hex....
Python: How to ignore an exception and proceed? [duplicate]
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This will catch SystemExit, KeyboardInterrupt and other things that you probably don't want to catch.
– FogleBird
Jan 2 '10 at 1:13
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When should I use Struct vs. OpenStruct?
... = 2;
Here are some common use cases.
OpenStructs can be used to easily convert hashes to one-off objects which respond to all the hash keys.
h = { a: 1, b: 2 }
o = OpenStruct.new(h)
o.a = 1
o.b = 2
Structs can be useful for shorthand class definitions.
class MyClass < Struct.new(:a,:b,:c)...
SQL Server Linked Server Example Query
...inked before executing the query!
To check for linked servers call:
EXEC sys.sp_linkedservers
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how to File.listFiles in alphabetical order?
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-1 I really don't understand the advantage of converting the file array to a string array and then sorting rather than just sorting the file array as the accepted answer does.
– zelanix
Feb 17 '14 at 21:49
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