papering - 博客园

2016年12月20日

but this usually doesn’t gain you anything.

摘要： The following rules describe the possibilities for defining the first TIMESTAMP column in a table with the current timestamp for both the default and 阅读全文

posted @ 2016-12-20 11:21 papering 阅读(230) 评论(0) 推荐(0) 编辑

SET GLOBAL slow_query_log=1

摘要： [SQL]SET slow_query_log=1 [Err] 1229 - Variable 'slow_query_log' is a GLOBAL variable and should be set with SET GLOBAL SHOW VARIABLES LIKE '%slow%' SET GLOBAL slow_query_log=1 SHOW VARIABLES ... 阅读全文

posted @ 2016-12-20 10:54 papering 阅读(321) 评论(0) 推荐(0) 编辑

SET GLOBAL long_query_time=0

摘要： 1 SHOW VARIABLES LIKE '%long%' 2 SET GLOBAL long_query_time=0 阅读全文

posted @ 2016-12-20 10:44 papering 阅读(250) 评论(0) 推荐(0) 编辑

mysql 索引聚簇索引聚集索引非聚集索引 clustered indexes nonclustered InnoDB 索引组织表 Index Organizied Table 堆组织表Heap Organizied Table

摘要：聚集索引和非聚集索引在索引结构中都只包含键和记录标识符。记录标识符总是指向数据页中的行。使用聚集索引，数据库管理器将尝试以与索引页中相应键相同的顺序保持数据页中的数据。因此，数据库管理器尝试将具有相似键的行插入到相同的页面上。如果对表进行了重组，则按照索引键的顺序将数据插入数据页。与非聚集索引的阅读全文

posted @ 2016-12-20 10:30 papering 阅读(233) 评论(0) 推荐(0) 编辑

DDL DML DCL SQL

摘要： https://dev.mysql.com/doc/refman/5.7/en/glossary.html#glos_ddl SQL The Structured Query Language that is standard for performing database operations. 阅读全文

posted @ 2016-12-20 10:26 papering 阅读(252) 评论(0) 推荐(0) 编辑

A BRIEF HISTORY OF COMPUTERS

摘要： COMPUTER ORGANIZATION AND ARCHITECTURE DESIGNING FOR PERFORMANCE NINTH EDITION Vacuum Tubes Transistors Integrated Circuits真空管晶体管集成电路 Electronic Num 阅读全文

posted @ 2016-12-20 09:30 papering 阅读(159) 评论(0) 推荐(0) 编辑

2016年12月19日

Computer architecture Computer organization

摘要： COMPUTER ORGANIZATION AND ARCHITECTURE DESIGNING FOR PERFORMANCEComputer architectureNINTH EDITION Computer architecture refers to those attributes of 阅读全文

posted @ 2016-12-19 13:14 papering 阅读(424) 评论(0) 推荐(0) 编辑

single-chip microcomputer Microcontroller 单片机单片微型计算机微控制器 GPIO 通用型输入输出 MCU 单片机微控制器

摘要： https://zh.wikipedia.org/wiki/单片机单片机，全称单片微型计算机（英语：single-chip microcomputer），又称微控制器（microcontroller），是把中央处理器、存储器、定时/计数器（timer/counter）、各种输入输出接口等都集成在一阅读全文

posted @ 2016-12-19 13:02 papering 阅读(998) 评论(0) 推荐(0) 编辑

2016年12月17日

3D 生物打印血管成功植入恒河猴体内

摘要： 3D 生物打印血管成功植入恒河猴体内阅读全文

posted @ 2016-12-17 20:08 papering 阅读(176) 评论(0) 推荐(0) 编辑

Object-relational mapping

摘要： https://en.wikipedia.org/wiki/Object-relational_mapping Object-relational mapping (ORM, O/RM, and O/R mapping tool) in computer science is a programmi 阅读全文

posted @ 2016-12-17 20:01 papering 阅读(202) 评论(0) 推荐(0) 编辑

mysqli_query($link,'SET group_concat_max_len=8192');

摘要： 1 mysqli_query($link,'SET group_concat_max_len=8192'); 2 $sql = 'SELECT GROUP_CONCAT(w) FROM ---'; 3 mysqli_query($link,$sql); 阅读全文

posted @ 2016-12-17 11:14 papering 阅读(220) 评论(0) 推荐(0) 编辑

2016年12月16日

the essence of the internet idea

摘要： Computer Systems A Programmer's Perspective Second Edition Of course, we are glossing over many difficult issues here. What if different net- works ha 阅读全文

posted @ 2016-12-16 23:27 papering 阅读(205) 评论(0) 推荐(0) 编辑

Checklist For Choosing The Right Database Engine

摘要： http://sqlite.org/whentouse.html Appropriate Uses For SQLite SQLite is not directly comparable to client/server SQL database engines such as MySQL, Or 阅读全文

posted @ 2016-12-16 19:08 papering 阅读(215) 评论(0) 推荐(0) 编辑

中文文本生成_实战

摘要： http://ltp.ai/demo.html 阅读全文

posted @ 2016-12-16 10:37 papering 阅读(560) 评论(0) 推荐(0) 编辑

writing concurrent programs

摘要： Computer Systems A Programmer's Perspective Second Edition To this point in our study of computer systems, we have assumed thatprograms run in isolati 阅读全文

posted @ 2016-12-16 09:39 papering 阅读(155) 评论(0) 推荐(0) 编辑

2016年12月15日

physical addressing virtual addressing 物理寻址虚拟寻址

摘要： Computer Systems A Programmer's Perspective Second Edition The main memory of a computer system is organized as an array of M contiguousbyte-sized cel 阅读全文

posted @ 2016-12-15 20:00 papering 阅读(424) 评论(0) 推荐(0) 编辑

General protection fault Exceptions in Linux/IA32 Systems

摘要： Computer Systems A Programmer's Perspective Second Edition Exception number Description Exception class0 Divide error Fault13 General protection fault 阅读全文

posted @ 2016-12-15 19:50 papering 阅读(379) 评论(0) 推荐(0) 编辑

access violation at address General protection fault

摘要： https://en.wikipedia.org/wiki/General_protection_fault In memory errors, the faulting program accesses memory that it should not access. Examples incl 阅读全文

posted @ 2016-12-15 19:38 papering 阅读(304) 评论(0) 推荐(0) 编辑

Bit-Value Type

摘要： https://dev.mysql.com/doc/refman/5.7/en/bit-type.html MySQL 5.7 Reference Manual / ... / Bit-Value Type - BIT 12.2.4 Bit-Value Type - BIT The BIT data 阅读全文

posted @ 2016-12-15 16:32 papering 阅读(199) 评论(0) 推荐(0) 编辑

Programs vs. processes

摘要： Computer Systems A Programmer's Perspective Second Edition This is a good place to pause and make sure you understand the distinction between a progra 阅读全文

posted @ 2016-12-15 13:39 papering 阅读(147) 评论(0) 推荐(0) 编辑

concurrency parallel 并发并行 parallelism

摘要：在传统的多道程序环境下，要使作业运行，必须为它创建一个或几个进程，并为之分配必要的资源。当进程运行结束时，立即撤销该进程，以便能及时回收该进程所占用的各类资源。进程控制的主要功能是为作业创建进程，撤销已经结束的进程，以及控制进程在运行过程中的状态转换。在现代os中，进程控制还具有为为一个进程创建若干阅读全文

posted @ 2016-12-15 13:11 papering 阅读(385) 评论(0) 推荐(0) 编辑

2016年12月14日

Regression analysis

摘要： https://en.wikipedia.org/wiki/Regression_analysis Regression analysis is widely used for prediction and forecasting, where its use has substantial ove 阅读全文

posted @ 2016-12-14 19:35 papering 阅读(245) 评论(0) 推荐(0) 编辑

Support vector machine

摘要： https://en.wikipedia.org/wiki/Support_vector_machine In machine learning, support vector machines (SVMs, also support vector networks[1]) are supervis 阅读全文

posted @ 2016-12-14 19:33 papering 阅读(256) 评论(0) 推荐(0) 编辑

Cluster analysis

摘要： https://en.wikipedia.org/wiki/Cluster_analysis Cluster analysis or clustering is the task of grouping a set of objects in such a way that objects in t 阅读全文

posted @ 2016-12-14 19:21 papering 阅读(374) 评论(0) 推荐(0) 编辑

cluster analysis in data mining

摘要： https://en.wikipedia.org/wiki/K-means_clustering k-means clustering is a method of vector quantization, originally from signal processing, that is pop 阅读全文

posted @ 2016-12-14 19:17 papering 阅读(279) 评论(0) 推荐(0) 编辑

Write Cache-friendly Code

摘要： Computer Systems A Programmer's Perspective Second Edition In Section 6.2, we introduced the idea of locality and talked in qualitative terms about wh 阅读全文

posted @ 2016-12-14 08:56 papering 阅读(270) 评论(0) 推荐(0) 编辑

2016年12月13日

a compromise between lock overhead and data safety

摘要： High Performance My SQL THIRD EDITION A locking strategy is a compromise between lock overhead and data safety, and thatcompromise affects performance 阅读全文

posted @ 2016-12-13 16:28 papering 阅读(137) 评论(0) 推荐(0) 编辑

Connection Management and Security

摘要： High Performance My SQL THIRD EDITION Each client connection gets its own thread within the server process. The connection’squeries execute within tha 阅读全文

posted @ 2016-12-13 16:26 papering 阅读(143) 评论(0) 推荐(0) 编辑

locality

摘要： Computer Systems A Programmer's Perspective Second Edition Well-written computer programs tend to exhibit good locality . That is, they tend to refere 阅读全文

posted @ 2016-12-13 13:29 papering 阅读(471) 评论(0) 推荐(0) 编辑

Universal Serial Bus USB 3.0

摘要： Computer Systems A Programmer's Perspective Second Edition A Universal Serial Bus (USB) controller is a conduit for devices attached to a USB bus, whi 阅读全文

posted @ 2016-12-13 13:06 papering 阅读(221) 评论(0) 推荐(0) 编辑

2016年12月12日

Shared libraries

摘要： Computer Systems A Programmer's Perspective Second Edition Shared libraries are modern innovations that address the disadvantages of static libraries. 阅读全文

posted @ 2016-12-12 23:12 papering 阅读(139) 评论(0) 推荐(0) 编辑

2016年12月11日

泌尿系统 Excretory system

摘要： https://zh.wikipedia.org/wiki/泌尿系统泌尿系統，有時也歸類於排泄系統（Excretory system）的一部分，負責尿液的產生、運送、儲存與排泄。人類的泌尿系統包括左右兩顆腎臟、左右兩條輸尿管、膀胱、內外兩道括約肌，以及尿道。泌尿系統的主要功能為排泄。排泄是指機體代阅读全文

posted @ 2016-12-11 22:16 papering 阅读(226) 评论(0) 推荐(0) 编辑

2016年12月10日

dynamic-link library shared library of functions and resources

摘要： https://msdn.microsoft.com/en-us/library/1ez7dh12.aspx A dynamic-link library (DLL) is an executable file that acts as a shared library of functions a 阅读全文

posted @ 2016-12-10 21:38 papering 阅读(135) 评论(0) 推荐(0) 编辑

2016年12月9日

xpath

摘要： $x("//ul[@id='s-results-list-atf']//li[@data-asin]/@data-asin") https://www.amazon.com/s/ref=nb_sb_noss?url=node%3D13896617011&field-keywords=huawei < 阅读全文

posted @ 2016-12-09 16:23 papering 阅读(282) 评论(0) 推荐(0) 编辑

Static Random-Access Memory Dynamic Random-Access Memory

摘要： COMPUTER ORGANIZATION AND ARCHITECTURE DESIGNING FOR PERFORMANCE NINTH EDITION RAM technology is divided into two technologies: dynamic and static. A 阅读全文

posted @ 2016-12-09 13:27 papering 阅读(305) 评论(0) 推荐(0) 编辑

zero cycles - 1 to 30 cycles - tens of millions of cycles

摘要： Computer Systems A Programmer's Perspective Second Edition To this point in our study of systems, we have relied on a simple model of a computer syste 阅读全文

posted @ 2016-12-09 13:12 papering 阅读(211) 评论(0) 推荐(0) 编辑

regardless of how many processors are devoted to a parallelized execution of this program

摘要： https://en.wikipedia.org/wiki/Amdah's_law Amdahl's law is often used in parallel computing to predict the theoretical speedup when using multiple proc 阅读全文

posted @ 2016-12-09 12:48 papering 阅读(211) 评论(0) 推荐(0) 编辑

2016年12月8日

Maximum Likelihood

摘要： https://en.wikipedia.org/wiki/Maximum_likelihood_estimation http://mathworld.wolfram.com/MaximumLikelihood.html 阅读全文

posted @ 2016-12-08 23:12 papering 阅读(140) 评论(0) 推荐(0) 编辑

Distinctive Image Features from Scale-Invariant

摘要： http://nichol.as/papers/Lowe/Distinctive Image Features from Scale-Invariant.pdf Abstract This paper presents a method for extracting distinctive inva 阅读全文

posted @ 2016-12-08 20:08 papering 阅读(174) 评论(0) 推荐(0) 编辑

Gender, Genre, and Writing Style in Formal Written Texts

摘要： http://u.cs.biu.ac.il/~koppel/papers/male-female-text-final.pdf Abstract. This paper explores differences between male and female writing in a large s 阅读全文

posted @ 2016-12-08 20:05 papering 阅读(256) 评论(0) 推荐(0) 编辑