加载中
Dump Sqlite3内存数据库

#encoding=utf-8 # 甄码农代码 2012 03 06 # 打开sqlite3内存数据库,执行操作,将内存数据库保存到文件 import sqlite3 import StringIO #使用:memory:标识打开的是内存数据库 c...

2013/09/13 18:39
875
PostgreSQL - Memory

Here is a list of recommended parameters for memory management in PostgreSQL. You should take into account mainly the following parameters. shared_buffers work_mem maintenance_w...

Postgresql - Expression Indexes

Having covered virtual columns recently, I wanted to cover one additional type of stored value, expression indexes. Unlike virtual columns, which are computed on each access, ex...

2013/04/08 22:44
124
Logging changes to postgresql.conf

It's Sunday morning here in Japan, which in my case means it's an excellent time for a round of database server updates without interrupting production flow (lucky me). None of ...

为什么用ls和du显示出来的文件大小有差别?

曾经有几次,我用ls和du查看一个文件的大小,发现二者显示出来的大小并不一致,例如: bl@d3:~/test/sparse_file$ ls -l fs.img -rw-r--r-- 1 bl bl 1073741824 2012-02-17 05:09 fs.img bl@...

PostgreSQL 关于在表之间连接

到目前为止,我们的查询一次只访问了一个表。查询可以一次访问多个表,或者用某种方式访问一个表,而同时处理该表的多个行。一个同时访问同一个或者不同表的多个行的查询叫连接查询。举例来说...

2012/12/31 13:04
255
5 Methods to Identify Your Linux File System Type

Question: How do I identify my file system type? I like to upgrade my current file system to the latest ext4. Before that I would like to know what my current file system type i...

2012/08/17 10:16
153

没有更多内容

加载失败,请刷新页面

返回顶部
顶部