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How do you find the row count for all your tables in Postgres
...mate:
SELECT schemaname,relname,n_live_tup
FROM pg_stat_user_tables
ORDER BY n_live_tup DESC;
That can also show you how many rows are dead, which is itself an interesting number to monitor.
The third way is to note that the system ANALYZE command, which is executed by the autovacuum proce...
How to disable the highlight control state of a UIButton?
...er {
self.btnImage.highlighted = NO;
NSLog(@"selfDismiss");
etc, etc, etc.
}
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Is mathematics necessary for programming? [closed]
....
I started programming when I was about 9 years old and it would be a stretch to say I had learnt much mathematics by that stage. However, with a bit of effort I was able to understand variables, for loops, goto statements (forgive me, I was Vic 20 BASIC and I hadn't read any Dijkstra yet) and bas...
How do you automate Javascript minification for your Java web applications?
...ros for Google Closure compiler
wro4j (Maven, servlet filters, plain Java, etc)
ant-yui-compressor (ant task for compressing JS+CSS)
JAWR
Minify Maven Plugin
humpty
Ant exec task using Terser
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How can I set the default timezone in node.js?
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@FlavorScape I use Etc/UTC There are also specific offsets available in Etc, but the offset is reverse of what one would expect. Etc/GMT-1 is UTC + 1 hour. See https://en.wikipedia.org/wiki/List_of_tz_database_time_zones
...
How to map calculated properties with JPA and Hibernate
...plex queries on other tables:
@Formula("(select min(o.creation_date) from Orders o where o.customer_id = id)")
private Date firstOrderDate;
Where id is the id of the current entity.
The following blog post is worth the read: Hibernate Derived Properties - Performance and Portability.
Without mo...
how to prevent “directory already exists error” in a makefile when using mkdir
...BJDIR)
You should see here the usage of the | pipe operator, defining an order only prerequisite.
Meaning that the $(OBJDIR) target should be existent (instead of more recent) in order to build the current target.
Note that I used mkdir -p. The -p flag was added compared to the example of the doc...
Running a cron every 30 seconds
...ice.
Here is a simple example that logs "Hello World" every 10 seconds:
/etc/systemd/system/helloworld.service:
[Unit]
Description=Say Hello
[Service]
ExecStart=/usr/bin/logger -i Hello World
/etc/systemd/system/helloworld.timer:
[Unit]
Description=Say Hello every 10 seconds
[Timer]
OnBootSec=...
Deleting all pending tasks in celery / rabbitmq
...ee an option to pick a different named queue.
Here's my process:
$ sudo /etc/init.d/celeryd stop # Wait for analytics task to be last one, Ctrl-C
$ ps -ef | grep analytics # Get the PID of the worker, not the root PID reported by celery
$ sudo kill <PID>
$ sudo /etc/init.d/celeryd stop # ...
node.js fs.readdir recursive directory search
... iteration - this guarantees that every iteration of the loop completes in order. In a parallel loop, all the iterations are started at the same time, and one may complete before another, however, it is much faster than a serial loop. So in this case, it's probably better to use a parallel loop beca...