大约有 48,000 项符合查询结果（耗时：0.0383秒） [XML]
How to thoroughly purge and reinstall postgresql on ubuntu? [closed]
...eta-package.
Once all PostgreSQL packages have been removed, run:
rm -r /etc/postgresql/
rm -r /etc/postgresql-common/
rm -r /var/lib/postgresql/
userdel -r postgres
groupdel postgres
You should now be able to:
apt-get install postgresql
or for a complete install:
apt-get install postgresql-...
Is 'switch' faster than 'if'?
... versa" - any support for this assertion? a compiler might assume that the order of your if clauses has already been hand-tuned to match frequency and relative performance needs, where as a switch is traditionally seen as an open invitation to optimise however the compiler chooses. Good point re ju...
Data Modeling with Kafka? Topics and Partitions
...
@RavindranathAkila Kafka is designed to have of the order of few thousands of partitions roughly less than 10,000. And the main bottleneck is zookeeper. A better way to design such a system is to have fewer partitions and use keyed messages to distribute the data over a fixed ...
Regular Expressions: Is there an AND operator?
...or, it isn't necessary that it be in a lookahead, but it doesn't hurt.
In order to match a whole paragraph, you need to anchor the regex at both ends and add a final .* to consume the remaining characters. Using Perl-style notation, that would be:
/^(?=.*word1)(?=.*word2)(?=.*word3).*$/m
The 'm...
What are some compelling use cases for dependent method types?
... environment (so the internal code of the function is not dependent on the order of state changes and thus remains declarative in that sense). How to type this in Scala?
The environment class must have an overloaded method which inputs such a function to call, and inputs the hash keys of the argume...
ALTER TABLE without locking the table?
...ferably in a transaction.
Once finished, recompile any stored procedures, etc that use that table. The execution plans will likely no longer be valid.
EDIT:
Some comments have been made about this limitation being a bit poor. So I thought I'd put a new perspective on it to show why it's how it ...
What do I use for a max-heap implementation in Python?
...ou have something that doesn't easily map to int/float, you can invert the ordering by wrapping them in a class with an inverted __lt__ operator.
– Daniel Stutzbach
Jul 23 '12 at 14:05
...
Transferring an app to another Firebase account
...
worked like a charm :) I wanted to add a new owner in order to switch google play account linked with Firebase project.
– Wahib Ul Haq
Jul 23 '17 at 18:34
7
...
Cannot download Docker images behind a proxy
...
First, create a systemd drop-in directory for the Docker service:
mkdir /etc/systemd/system/docker.service.d
Now create a file called /etc/systemd/system/docker.service.d/http-proxy.conf that adds the HTTP_PROXY environment variable:
[Service]
Environment="HTTP_PROXY=http://proxy.example.com:80...
Total memory used by Python process?
...tion that works for various operating systems, including Linux, Windows 7, etc.:
import os
import psutil
process = psutil.Process(os.getpid())
print(process.memory_info().rss) # in bytes
On my current Python 2.7 install with psutil 5.6.3, the last line should be
print(process.memory_info()[0...