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查看sqlserver 2008中性能低下的语句
SELECT creation_time N'语句编译时间' ,last_execution_time N'上次执行时间' ,total_physical_reads N'物理读取总次数' ,total_logical_reads/execution_count N'每次逻辑读次数' ,total_
分类:数据库   时间:2016-02-20 14:36:18    阅读次数:234
Postgres 9.4 feature highlight: REPLICA IDENTITY and logical replication
Among the many things to say about logical replication features added in PostgreSQL 9.4, REPLICA IDENTITY is a new table-level parameter that can be u
分类:其他好文   时间:2016-02-02 20:40:43    阅读次数:339
学习笔记1 2016/1/26 how to use git
How to use git:1.commit 当发生logical change的时候,无论是修改还是添加新代码2.git log 查看该repo内的commit git log --stat 给出数据统计 xx changed......3.git diff commitB commitA .....
分类:其他好文   时间:2016-01-26 23:30:39    阅读次数:170
[Cycle.js] The Cycle.js principle: separating logic from effects
The guiding principle in Cycle.js is we want to separate logic from effects. This first part here was logical, and this second part here was effects. ...
分类:Web程序   时间:2016-01-26 20:15:27    阅读次数:177
黑马程序猿 ---------- Java网络技术之 ---正則表達式 (Day06)
----------------------ASP.Net+Unity开发、.Net培训、期待与您交流。 ----------------------正則表達式正則表達式:基本知识1 字符, 2 字符类 ,3 提前定义字符类 ,4 边界匹配器 ,5 Greedy 数量词,6 Logical 运算符....
分类:编程语言   时间:2016-01-26 18:31:10    阅读次数:184
interblock corruption & intrablock corruption
interblock corruption: corruption blocks rather than within the block itself. can only be logical corruption. intrablock corruption: corruption wit...
分类:其他好文   时间:2016-01-25 14:30:05    阅读次数:408
将盘mount到已存在路径,路径下文件显示不了
添加盘: Disk /dev/sdb: 1073 MB, 1073741824 bytes 255 heads, 63 sectors/track, 130 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O siz...
分类:其他好文   时间:2016-01-23 13:18:21    阅读次数:203
Logical read, Physical read (SET STATISTICS IO)
在查询性能优化时,Logical Read非常重要,它的计数一般与查询出来的结果集数量成正比,与数据读取的速度也成正比。1,SET STATISTICS IO显式DiskIO的信息SyntaxSET STATISTICS IO { ON | OFF }Output item MeaningTable...
分类:其他好文   时间:2016-01-21 13:42:37    阅读次数:155
Linux LVM硬盘管理及LVM扩容
一、LVM简介LVM是 Logical Volume Manager(逻辑卷管理)的简写,它由Heinz Mauelshagen在Linux 2.4内核上实现。LVM将一个或多个硬盘的分区在逻辑上集合,相当于一个大硬盘来使用,当硬盘的空间不够使用的时候,可以继续将其它的硬盘的分区加入其 中,这样可以...
分类:系统相关   时间:2016-01-18 17:33:35    阅读次数:203
Streaming replication slots in PostgreSQL 9.4
Streaming replication slots are a pending feature in PostgreSQL 9.4, as part ofthe logical changeset extractionfeature.What are they for, what do you ...
分类:数据库   时间:2016-01-18 01:49:50    阅读次数:307
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