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Is there any performance gain in indexing a boolean field?
...e an index, if you have too many records it doesn't use the index anyways.
MySQL not using index when checking = 1 , but using it with = 0
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What is SQL injection? [duplicate]
...d queries, or applying your language/toolkit's escaping functions (such as mysql_real_escape_string() in PHP).
Once you understand SQL Injection you'll get the joke behind this cartoon.
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How to pull a random record using Django's ORM?
...e backend you're using." - any experience on diffrent DB backends? (sqlite/mysql/postgres)?
– kender
Jun 8 '09 at 9:37
4
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How to implement the activity stream in a social network
...s to browse far back in time (if you even offer this)
I use a plain old MySQL table for dealing with about 15 million activities.
It looks something like this:
id
user_id (int)
activity_type (tinyint)
source_id (int)
parent_id (int)
parent_type (tinyint)
time ...
SQL WHERE condition is not equal to?
...uple of times.. but it didn't seem to work until I realized that DELETE in MySQL does not use the * ..
– Frank Vilea
May 27 '11 at 19:59
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Good Free Alternative To MS Access [closed]
...ess, you generally want a database server engine, like MS SQL, Postgresql, MySQL, Oracle, or their brethren. At the same time, those server engines are rarely if ever appropriate for a single-user desktop application.
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Linux日志管理Rsyslog入门 - C/C++ - 清泛网 - 专注IT技能提升
...这里着重与快速上手。
安装配置
我以CentOS为例，说明如何通过RPM来安装Rsyslog：
shell> cd /etc/yum.repos.d/
shell> wget http://rpms.adiscon.com/v8-stable/rsyslog.repo
shell> yum install rsyslog
安装完成后，我们可以查看一下到底都装了些什么东西...
Linux日志管理Rsyslog入门 - C/C++ - 清泛网 - 专注IT技能提升
...这里着重与快速上手。
安装配置
我以CentOS为例，说明如何通过RPM来安装Rsyslog：
shell> cd /etc/yum.repos.d/
shell> wget http://rpms.adiscon.com/v8-stable/rsyslog.repo
shell> yum install rsyslog
安装完成后，我们可以查看一下到底都装了些什么东西...
Linux日志管理Rsyslog入门 - C/C++ - 清泛网 - 专注IT技能提升
...这里着重与快速上手。
安装配置
我以CentOS为例，说明如何通过RPM来安装Rsyslog：
shell> cd /etc/yum.repos.d/
shell> wget http://rpms.adiscon.com/v8-stable/rsyslog.repo
shell> yum install rsyslog
安装完成后，我们可以查看一下到底都装了些什么东西...
Linux日志管理Rsyslog入门 - C/C++ - 清泛网 - 专注IT技能提升
...这里着重与快速上手。
安装配置
我以CentOS为例，说明如何通过RPM来安装Rsyslog：
shell> cd /etc/yum.repos.d/
shell> wget http://rpms.adiscon.com/v8-stable/rsyslog.repo
shell> yum install rsyslog
安装完成后，我们可以查看一下到底都装了些什么东西...