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Right query to get the current number of connections in a PostgreSQL DB
...l
select * from
(select count(*) used from pg_stat_activity) q1,
(select setting::int res_for_super from pg_settings where name=$$superuser_reserved_connections$$) q2,
(select setting::int max_conn from pg_settings where name=$$max_connections$$) q3;
...
Mysql adding user for remote access
...n private MySQL instance. I followed your CREATE USER and GRANT ALL steps, set mysql.default_port = <private instance port> in my php.ini, and then used 127.0.0.1 throughout for my db hostname
– spex
Sep 11 '13 at 18:41
...
Mongodb Explain for Aggregation framework
...be in-memory (possibly using temporary files if the allowDiskUse option is set).
Optimizing pipelines
In general, you can optimize aggregation pipelines by:
Starting a pipeline with a $match stage to restrict processing to relevant documents.
Ensuring the initial $match / $sort stages are suppor...
How to display hidden characters by default (ZERO WIDTH SPACE ie. ​)
... you meant, but you can permanently turn showing whitespaces on and off in Settings -> Editor -> General -> Appearance -> Show whitespaces.
Also, you can set it for a current file only in View -> Active Editor -> Show WhiteSpaces.
Edit:
Had some free time since it looks like a p...
C# Iterate through Class properties
I'm currently setting all of the values of my class object Record .
4 Answers
4
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Do git tags get pushed as well?
... with a remote repository somebody has published, which means:
the set of tags that exist there are all the publisher wanted people to see, and
not only you but other people will also see the same tags.
In other words, tags in repositories you fetch from are designed to be public...
What is the IntelliJ shortcut key to create a javadoc comment?
...ing for how to get IntelliJ to update javadoc after a code change, you can set this in Settings -> IDE Settings -> Keymap.
– Mark McDonald
Oct 9 '13 at 1:50
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how to use “AND”, “OR” for RewriteCond on Apache?
...on each pass though the loop it checks CONDFLAG_ORNEXT which would only be set when looking at A and C. When it is set it either skips the next condition if the current condition passed or it continues not caring that the current condition failed because future conditions may pass and the last of t...
Does const mean thread-safe in C++11?
...
class rect {
int width = 0, height = 0;
public:
/*...*/
void set_size( int new_width, int new_height ) {
width = new_width;
height = new_height;
}
int area() const {
return width * height;
}
};
The member-function area is thread-safe; not because it...
How to get the raw value an field?
...nput number field's sanitization algorithm says the browser is supposed to set the value to an empty string if the input isn't a valid floating point number.
The value sanitization algorithm is as follows: If the value of the
element is not a valid floating-point number, then set it to the emp...