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Master-master vs master-slave database architecture?
...piled
1. Master-Slave Replication
Pros
Analytic applications can read from the slave(s) without impacting the master
Backups of the entire database of relatively no impact on the master
Slaves can be taken offline and sync back to the master without any downtime
Cons
In the instance of a f...
Bash Script : what does #!/bin/bash mean? [duplicate]
...interpreted and run by the bash shell.
Some other example shebangs are:
(From Wikipedia)
#!/bin/sh — Execute the file using sh, the Bourne shell, or a compatible shell
#!/bin/csh — Execute the file using csh, the C shell, or a compatible shell
#!/usr/bin/perl -T — Execute using Perl with th...
What does “Mass Assignment” mean in Laravel?
...u want this to actually allow for updating.
You can also block all fields from being mass-assignable by doing this:
protected $guarded = ['*'];
Let's say in your user table you have a field that is user_type and that can have values of user / admin
Obviously, you don't want users to be able to ...
How to get the ASCII value of a character
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From here:
function ord() would get the int value
of the char. And in case you want to
convert back after playing with the
number, function chr() does the trick.
>>> ord('a')
97
>>> chr(97)
'a'
&...
How do I work around JavaScript's parseInt octal behavior?
...
From the parseInt documentation, use the optional radix argument to specify base-10:
parseInt('08', 10); //equals 8
parseInt('09', 10); //equals 9
This strikes me as pedantic, confusing, and verbose (really, an extra argum...
Clojure differences between Ref, Var, Agent, Atom, with examples
...o Identities needs to change together, the classic example is moving money from one bank account to another, it needs to either move completely or not at all.
Uncoordinated access is used when only one Identity needs to update, this is a very common case.
Synchronous access is used when the cal...
how to show lines in common (reverse diff)?
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I just learned the comm command from this thread, but wanted to add something extra: if the files are not sorted, and you don't want to touch the original files, you can pipe the outptut of the sort command. This leaves the original files intact. Works in...
How to index into a dictionary?
...n implementation detail. The language specification includes ordered dicts from 3.7 onwards.)
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iPhone viewWillAppear not firing
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Yes, afterwards. Created subview from XIB, viewWillAppear wasn't called. Call it by myself and everything works just fine.
– JOM
Feb 16 '10 at 7:03
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When to add what indexes in a table in Rails
...x (:users, [:category_id, :state_id]), what happens? How is this different from adding the index for each key?
Then the index is a combined index of the two columns. That doesn't make any sense, unless you want all entries for one category_id AND one state_id (It should be category_id not categor...