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【转】mongodb可以通过profile来监控数据 (mongodb性能优化)
开启 Profiling 功能,对慢查询进行优化:mongodb可以通过profile来监控数据,进行优化。查看当前是否开启profile功能用命令db.getProfilingLevel() 返回level等级,值为0|1|2,分别代表意思:0代表关闭,1代表记录慢命令,2代表全部db.setPr...
分类:数据库   时间:2014-05-24 01:26:42    阅读次数:352
官方文档翻译:Innodb的锁
InnoDBRecord, Gap, and Next-Key Locks考虑到翻译准确性,对于某些特殊名称不做翻译,以免误导;InnoDBhas several types of record-level locks including record locks, gap locks, and n...
分类:数据库   时间:2014-05-23 23:19:29    阅读次数:683
关于java.lang.NoClassDefFoundError: org.achartengine.model.XYMultipleSeriesDataset 错误
解决办法:首选找到 build path - 然后选择 Configure build path项选择 "Order and Export" 栏选中 "achartengine-1.0.0.jar“,然后让它置顶,点击"UP"更新你的项目(Project -> Clean...)碰到包类似的错,也....
分类:编程语言   时间:2014-05-23 10:24:56    阅读次数:311
分页存储过程
表T_phone中字段:Id, Haoduan, Adress, Type, Quhao1,ROW_NUMBER()是个开窗函数,它可以与聚合函数一起用,就算删除表中的列,排序也不会乱select *,ROW_NUMBER() over(order by id) as 排序 from T_Phone...
分类:其他好文   时间:2014-05-20 13:16:26    阅读次数:260
poj_1018_多种方法求解
Communication SystemTime Limit: 1000MSMemory Limit: 10000KTotal Submissions: 22445Accepted: 7977DescriptionWe have received an order from Pizoor Comm....
分类:其他好文   时间:2014-05-20 07:37:17    阅读次数:454
Java基础知识
volatile:java关键字,意为易变的,不稳定的,标识修饰java同步字段,示例:java单利模式public class ApplicationCache{ private Map attributeMap; // volatile so that JVM out-of-order...
分类:编程语言   时间:2014-05-19 14:56:56    阅读次数:334
【转】matlab读取文件各种方法
本技术支持指南主要处理:ASCII, binary, and MAT files.要得到MATLAB中可用来读写各种文件格式的完全函数列表,可以键入以下命令: help iofun MATLAB中有两种文件I/O程序:high level and low level. High leve...
分类:其他好文   时间:2014-05-19 14:01:25    阅读次数:393
LeetCode:Add Two Numbers
题目链接 You are given two linked lists representing two non-negative numbers. The digits are stored in reverse order and each of their nodes contain a si...
分类:其他好文   时间:2014-05-19 13:53:32    阅读次数:296
poj 3177 Redundant Paths
DescriptionIn order to get from one of the F (1 2 and 1 –> 6 –> 5 –> 21 – 4: 1 –> 2 –> 3 –> 4 and 1 –> 6 –> 5 –> 43 – 7: 3 –> 4 –> 7 and 3 –> 2 –> 5 ....
分类:其他好文   时间:2014-05-19 12:43:06    阅读次数:200
【LeetCode】Add Two Numbers
You are given two linked lists representing two non-negative numbers. The digits are stored in reverse order and each of their nodes contain a single ...
分类:其他好文   时间:2014-05-19 12:05:23    阅读次数:386
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