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(353)
推荐(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(276)
推荐(0)
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(319)
推荐(0)
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(310)
推荐(0)
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(198)
推荐(0)
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(480)
推荐(0)
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(1386)
推荐(0)
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(196)
推荐(0)
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(253)
推荐(0)
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(256)
推荐(0)
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(253)
推荐(0)
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(285)
推荐(0)
摘要：
http://ltp.ai/demo.html
阅读全文
posted @ 2016-12-16 10:37
papering
阅读(614)
推荐(0)
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(196)
推荐(0)
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(479)
推荐(0)
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(511)
推荐(0)
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(384)
推荐(0)
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(254)
推荐(0)
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(183)
推荐(0)
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(467)
推荐(0)
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(324)
推荐(0)
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(302)
推荐(0)
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(468)
推荐(0)
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(318)
推荐(0)
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(310)
推荐(0)
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(163)
推荐(0)
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(165)
推荐(0)
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(511)
推荐(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(264)
推荐(0)
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(186)
推荐(0)
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(275)
推荐(0)
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(210)
推荐(0)
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(328)
推荐(0)
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(360)
推荐(0)
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(272)
推荐(0)
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(263)
推荐(0)
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(171)
推荐(0)
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(243)
推荐(0)
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(326)
推荐(0)
摘要：
Computer Systems A Programmer's Perspective Second Edition Modern compilers employ sophisticated algorithms to determine what values are computed in a
阅读全文
posted @ 2016-12-08 19:59
papering
阅读(267)
推荐(0)
浙公网安备 33010602011771号