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初接触Linux,LVM的备份
今天给大家来的得失LVM相关的备份一、LVM快照写时复制的特性(copy-on-write,COW)写时复制快照在快照时间点之后,没有物理数据复制发生,仅仅复制了原始数据物理位置的元数据。因此,快照创建非常快,可以瞬间完成。然后,快照副本跟踪原始卷的数据变化(即原始卷写操作),..
分类:系统相关   时间:2014-05-05 12:27:20    阅读次数:561
codechef Birthday Candles 题解
Birthday Candles The chef is preparing a birthday cake for one of his guests, and his decided to write the age of the guest in candles on the cake. There are 10 types of candles, one for each o...
分类:其他好文   时间:2014-05-04 18:46:55    阅读次数:416
codechef Cleaning Up 题解
After a long and successful day of preparing food for the banquet, it is time to clean up. There is a list of n jobs to do before the kitchen can be closed for the night. These jobs are indexed from 1...
分类:其他好文   时间:2014-05-04 18:25:07    阅读次数:384
《linux 内核完全剖析》上帝为什么是右移20,而不是22! dir = (unsigned long *) ((from>>20) & 0xffc)
在memory.c里面有这么一段代码。为了其中的一句话,让我内牛满面啊!  dir = (unsigned long *) ((from>>20) & 0xffc) int free_page_tables(unsigned long from,unsigned long size) { unsigned long *pg_table; unsigned long...
分类:系统相关   时间:2014-05-04 18:22:41    阅读次数:459
travel the binary tree by level 4 ( from down to top and from left to right every level )
travel the binary tree by level 4 ( from down to top and from left to right every level ) 个人信息:就读于燕大本科软件工程专业 目前大三; 本人博客:google搜索“cqs_2012”即可; 个人爱好:酷爱数据结构和算法,希望将来从事算法工作为人民作出自己的贡献; 博客内容:tr...
分类:其他好文   时间:2014-05-04 18:22:16    阅读次数:381
Codechef Nuclear Reactors 题解
There are K nuclear reactor chambers labelled from 0 to K-1. Particles are bombarded onto chamber 0. The particles keep collecting in the chamber 0. However if at any time, there are more than N parti...
分类:其他好文   时间:2014-05-04 18:00:17    阅读次数:372
Exception loading sessions from persistent storage
严重: Exception loading sessions from persistent storage  java.io.EOFException 删除Tomcat里面的work/Catalina/localhost下的内容即可解决 Tomcat在启动时出现如下异常问题: 严重: IOException while loading persisted sessions...
分类:其他好文   时间:2014-05-04 17:58:54    阅读次数:313
[TroubleShooting]'trn\bak' is incorrectly formed. SQL Server cannot process this media family.
?? SQL Server online consultants came across an interesting scenario where one of our client was unable to restore a native SQL Server backup successfully performed from one instance running on M...
分类:数据库   时间:2014-05-04 17:42:50    阅读次数:394
SQL 学习日志01
查看一个数据库的所有表:SelectTABLE_NAMEFROM数据库名称.INFORMATION_SCHEMA.TABLESWhereTABLE_TYPE=‘BASETABLE‘(select*from表名where条件)查看一张表的表结构:sp_helptable_name(表名)获取的信息比较全sp_columnstable_name(表名)创建数据库:usemastergocreatedatabase..
分类:数据库   时间:2014-05-04 17:27:23    阅读次数:456
ORA-32001:write to SPFILE requested but no SPFILE is in use问题的解决
在执行该命令时出现下列错误SYS@PROD>altersystemsetUTL_FILE_DIR=‘/home/oracle‘,‘/home/oracle/temp‘,‘/home/oracle/scripts‘scope=spfile;altersystemsetUTL_FILE_DIR=‘/home/oracle‘,‘/home/oracle/temp‘,‘/home/oracle/scripts‘scope=spfile*ERRORatline1:ORA-32001:wr..
分类:其他好文   时间:2014-05-04 17:08:06    阅读次数:386
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