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廉价共享存储解决方案2-drbd+cman+gfs2 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...ecting.
2.1验证一下
[root@gfs_2 ~]# ssh gfs_1 date 没有输入密码直接出来结果，互信配置完毕
2015年 12月 14日 星期一 23:48:18 CST
2.2配置yum 阿里源
1．卸载自带的源
rpm -aq | grep yum | xargs rpm -e --nodeps
安装阿里源
rpm -ivh http...
Simplest way to do a recursive self-join?
...
WITH q AS
(
SELECT *
FROM mytable
WHERE ParentID IS NULL -- this condition defines the ultimate ancestors in your chain, change it as appropriate
UNION ALL
SELECT m.*
FROM mytable m
...
Light weight alternative to Hibernate? [closed]
...rt for standard SQL including SQL language features such as UNIONs, nested SELECTs, all types of JOINs, aliasing (e.g. for self-joins), etc
Wide support for non-standard SQL including UDT's, stored procedures, vendor-specific functions, etc.
Read about jOOQ in this article: http://java.dzone.com/a...
How to shrink/purge ibdata1 file in MySQL
I am using MySQL in localhost as a "query tool" for performing statistics in R, that is, everytime I run a R script, I create a new database (A), create a new table (B), import the data into B, submit a query to get what I need, and then I drop B and drop A.
...
SQLAlchemy - Getting a list of tables
...te_engine('postgresql+psycopg2://root:password@localhost/
q = eng.execute('SELECT * FROM pg_catalog.pg_tables')
share
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SQL is null and = null [duplicate]
...e t (x int, y int);
insert into t values (null, null), (null, 1), (1, 1);
select 'x = null' as test , x, y from t where x = null
union all
select 'x != null', x, y from t where x != null
union all
select 'not (x = null)', x, y from t where not (x = null)
union all
select 'x = y', x, y from t where ...
When to use Common Table Expression (CTE)
...ing well? Can someone give me a simple example of limitations with regular select, derived or temp table queries to make the case of CTE? Any simple examples would be highly appreciated.
...
Abusing the algebra of algebraic data types - why does this work?
...gard that for the sake of simplicity.
A few initial points:
Note that "union" is probably not the best term for A+B here--that's specifically a disjoint union of the two types, because the two sides are distinguished even if their types are the same. For what it's worth, the more common term is ...
MySQL: Enable LOAD DATA LOCAL INFILE
I'm running Mysql 5.5 on Ubuntu 12 LTS. How should I enable LOAD DATA LOCAL INFILE in my.cnf?
18 Answers
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淘宝网采用什么技术架构来实现网站高负载的 - 更多技术 - 清泛网 - 专注C/C...
...淘宝目前的一些底层技术框架以及自己的一些感触来说说如何构建一个可 伸缩，高性能，高可用性的分布式互联网应用。时间过得很快，来淘宝已经两个月了，在这两个月的时间里，自己也感受颇深。下面就结合淘宝目前的一...