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When to Redis? When to MongoDB? [closed]
... need to change your schema quickly.
Because there is no schema! Altering tables in traditional, relational DBMS is painfully expensive and slow. MongoDB solves this problem by not making a lot of assumptions on your underlying data. Nevertheless, it tries to optimize as far as possible without req...
pull out p-values and r-squared from a linear regression
...d ##R squared values
For gls() generated models:
summary(fit)$tTable[,4] ##P-values
##R-squared values are not generated b/c gls uses max-likelihood not Sums of Squares
To isolate an individual p-value itself, you'd add a row number to the code:
For example to access the p-va...
Invoke-WebRequest, POST with parameters
...
Put your parameters in a hash table and pass them like this:
$postParams = @{username='me';moredata='qwerty'}
Invoke-WebRequest -Uri http://example.com/foobar -Method POST -Body $postParams
...
Difference between shared objects (.so), static libraries (.a), and DLL's (.so)?
...c library(.a) is a library that can be linked directly into the final executable produced by the linker,it is contained in it and there is no need to have the library into the system where the executable will be deployed.
A shared library(.so) is a library that is linked but not embedded in the fin...
Linux下部署企业级邮件服务器(postfix + dovecot + extmail) - 开源 & Gith...
...dmin
MYSQL_PORT 0
MYSQL_DATABASE mysql
MYSQL_USER_TABLE passwd
MYSQL_CRYPT_PWFIELD crypt
MYSQL_UID_FIELD uid
MYSQL_GID_FIELD gid
MYSQL_LOGIN_FIELD id
MYSQL_HOME_FIELD home
MYSQL_NAME_FIELD name
# MYSQL_MAILDIR_FIELD mai...
Storing a Map using JPA
...on
@MapKeyColumn(name="name")
@Column(name="value")
@CollectionTable(name="example_attributes", joinColumns=@JoinColumn(name="example_id"))
Map<String, String> attributes = new HashMap<String, String>(); // maps from attribute name to value
}
See also (in the JPA 2.0 s...
List of Java class file format major version numbers?
...ipse.
Build path
Configure build path
Change library to correspondent of table that friend shows last.
Create "jar file" and compile and execute.
I did that and it worked.
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The specified named connection is either not found in the configuration, not intended to be used wit
...executing assembly doesn't have an app.config? In my case the calling executable is a VB6 app that calls my assembly (where the entity objects are) through COM Interop.
– Perishable Dave
Dec 1 '11 at 19:13
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Find difference between timestamps in seconds in PostgreSQL
I have a table in PostgreSQL 8.3 with 2 timestamp columns. I would like to get the difference between these timestamps in seconds. Could you please help me how to get this done?
...
How to migrate back from initial migration in Django 1.7?
...pp> zero
This clears <app> from migration history and drops all tables of <app>
See django docs for more info.
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