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mongodb避免的查询模式
1少用countdb.testcol1.find({xxx:15}).count()2避免large-skipdb.testcol1.find({xxx:15}).skip(100000).limit(10)3不用notin
分类:数据库   时间:2015-06-12 15:06:46    阅读次数:100
Leetcode 207 Course Schedule
There are a total ofncourses you have to take, labeled from0ton - 1.Some courses may have prerequisites, for example to take course 0 you have to firs...
分类:其他好文   时间:2015-06-12 09:52:41    阅读次数:125
Leetcode 210 Course Schedule II
here are a total ofncourses you have to take, labeled from0ton - 1.Some courses may have prerequisites, for example to take course 0 you have to first...
分类:其他好文   时间:2015-06-12 09:49:39    阅读次数:116
Mysql Root密码丢失
service mysqld stopmysqld_safe –skip-grant-tables –user=mysql& // 跳过授权表 mysql.user 和 mysql.dbmysql -urootset password=password("yourpasswd"); // 出现报.....
分类:数据库   时间:2015-06-12 00:46:41    阅读次数:159
sensor的skipping and binning 模式
关于sensor的缩放存在两种模式 binning mode 和skip modeskipping mode 就是把想要的数据采集上来 把其余的数据扔掉 如下所示 column skip 2 row skip 2 留下的就是白色的像素 黑色的像素丢掉。binning mode 就是把相邻的像素合成一...
分类:其他好文   时间:2015-06-11 16:15:05    阅读次数:138
Linq的一些记录
1.IQueryable接口与IEnumberable接口的区别: IEnumerable 泛型类在调用自己的SKip 和 Take 等扩展方法之前数据就已经加载在本地内存里了,而IQueryable 是将Skip ,take 这些方法表达式翻译成T-SQL语句之后再向SQL服务器发送命令,它并不是...
分类:其他好文   时间:2015-06-10 23:48:14    阅读次数:148
mysql忘记密码解决办法
修改my.cnf文件(一般在/etc/my.cnf),在[mysqld]节点中添加一行 skip-grant-tables(启动mysql时不启用授权表),然后重启mysql服务器(/etc/init.d/mysqld restart)重启完以后用mysql可直接进入mysql命令行,然后修改mys...
分类:数据库   时间:2015-06-10 19:05:04    阅读次数:173
UVA1482:Playing With Stones(SG)
Description You and your friend are playing a game in which you and your friend take turns removing stones from piles. Initially there are N piles witha1, a2, a3,..., aN number of stones. On ...
分类:其他好文   时间:2015-06-10 14:14:53    阅读次数:114
LightOJ1020(博弈)
Alice and Bob are playing a game with marbles; you may have played this game in childhood. The game is playing by alternating turns. In each turn a player can take exactly one or two marbles.Both Alice...
分类:其他好文   时间:2015-06-09 22:05:33    阅读次数:166
Java for LeetCode 210 Course Schedule II【Unsolved】
There are a total of n courses you have to take, labeled from 0 to n - 1.Some courses may have prerequisites, for example to take course 0 you have to...
分类:编程语言   时间:2015-06-09 21:28:54    阅读次数:110
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