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What's the difference between deadlock and livelock?
...k 1
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Both examples force the threads to aquire the locks in different orders.
While the deadlock waits for the other lock,
the livelock does not really wait - it desperately tries to acquire the lock without the chance of gettin
Postgres and Indexes on Foreign Keys and Primary Keys
...n ('pg_catalog', 'pg_toast')
and pg_catalog.pg_table_is_visible(c.oid)
order by
n.nspname
,t.relname
,c.relname
If you want to delve further (such as columns and ordering), you need to look at pg_catalog.pg_index. Using psql -E [dbname] comes in handy for figuring out how to query...
Show/hide 'div' using JavaScript
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How to show or hide an element:
In order to show or hide an element, manipulate the element's style property. In most cases, you probably just want to change the element's display property:
element.style.display = 'none'; // Hide
element.style.displ...
vs
In order to define charset for HTML5 Doctype , which notation should I use?
8 Answers
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Unable to execute dex: Multiple dex files define Lcom/myapp/R$array;
...ct Build Path -> Configure Build Path
In Java Build Path, go to the tab Order and Export
Uncheck your .jar library
Only sometimes:
In Order and Export tab I did not have any jar library there, so I have unchecked Android Private Libraries item. Now my project is running.
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What should go into an .h file?
...ared symbols, like functions, or definition of structures, classes, enums, etc., could need to be shared.
Headers are used to put those shared details.
Move to the header the declarations of what need to be shared between multiple sources
Nothing more?
In C++, there are some other things that co...
Linux环境离线安装docker&docker-compose - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...docker服务
# 创建docker服务配置文件docker.service
sudo vim /etc/systemd/system/docker.service
# 在文件中添加一下内容：
[Unit]
Description=Docker Application Container Engine
Documentation=https://docs.docker.com
After=network-online.target firewalld.service
W...
MySQL root access from all hosts
...tstat -tupan | grep mysql
Update For Ubuntu 16:
Config file is (now)
/etc/mysql/mysql.conf.d/mysqld.cnf
(at least on standard Ubuntu 16)
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Can I read the hash portion of the URL on my server-side application (PHP, Ruby, Python, etc.)?
Assuming a URL of:
12 Answers
12
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Linux command or script counting duplicated lines in a text file?
...ve counts, i.e.:
sort filename | uniq -c
and to get that list in sorted order (by frequency) you can
sort filename | uniq -c | sort -nr
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