papering - 博客园

2016年12月24日

摘要： COMPUTER ORGANIZATION AND ARCHITECTURE DESIGNING FOR PERFORMANCE NINTH EDITION Referring back to Figure 8.11, we have discussed three types of queues: 阅读全文

posted @ 2016-12-24 05:40 papering 阅读(721) 评论(0) 推荐(0) 编辑

Partitioning

摘要： COMPUTER ORGANIZATION AND ARCHITECTURE DESIGNING FOR PERFORMANCE NINTH EDITION The simplest scheme for partitioning available memory is to use fixed-s 阅读全文

posted @ 2016-12-24 05:15 papering 阅读(220) 评论(0) 推荐(0) 编辑

2016年12月23日

Stationary point

摘要： https://en.wikipedia.org/wiki/Stationary_point https://zh.wikipedia.org/wiki/驻点阅读全文

posted @ 2016-12-23 22:42 papering 阅读(309) 评论(0) 推荐(0) 编辑

Memory Allocation in the MySQL Server

摘要： https://dev.mysql.com/doc/internals/en/memory-allocation-mysql-server.html MySQL Internals Manual / Memory Allocation / Memory Allocation in the MySQL 阅读全文

posted @ 2016-12-23 20:02 papering 阅读(243) 评论(0) 推荐(0) 编辑

the OS maintains a number of queues

摘要： COMPUTER ORGANIZATION AND ARCHITECTURE DESIGNING FOR PERFORMANCE NINTH EDITION To do its job, the OS maintains a number of queues. Each queue is simpl 阅读全文

posted @ 2016-12-23 19:57 papering 阅读(220) 评论(0) 推荐(0) 编辑

matches field ID value 17.9.1 The LABEL element

摘要： https://www.w3.org/TR/html401/interact/forms.html#edef-LABEL 阅读全文

posted @ 2016-12-23 18:36 papering 阅读(401) 评论(0) 推荐(0) 编辑

corresponding SQLSTATE values general error

摘要： http://dev.mysql.com/doc/refman/5.7/en/error-messages-server.html B.3 Server Error Codes and Messages MySQL programs have access to several types of e 阅读全文

posted @ 2016-12-23 16:01 papering 阅读(273) 评论(0) 推荐(0) 编辑

控制变量法-初中物理-Nobel Lecture, December 12, 1929-php执行SET GLOBAL connect_timeout=2效果

摘要： Navicat 'ww' root账户用php、Navicat、\MySQL\bin\mysql.exe 执行阅读全文

posted @ 2016-12-23 15:41 papering 阅读(386) 评论(0) 推荐(0) 编辑

Allowed memory size Out of memory ini_set('memory_limit', '-1');

摘要： Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 51 bytes) Fatal error: Out of memory (allocated 1013186560) (tried to 阅读全文

posted @ 2016-12-23 14:45 papering 阅读(228) 评论(0) 推荐(0) 编辑

PROCESS STATES

摘要： COMPUTER ORGANIZATION AND ARCHITECTURE DESIGNING FOR PERFORMANCE NINTH EDITION To understand the operation of the short-term scheduler, we need to con 阅读全文

posted @ 2016-12-23 13:07 papering 阅读(245) 评论(0) 推荐(0) 编辑

I O memory 时时考虑

摘要： I O memory 时时考虑阅读全文

posted @ 2016-12-23 12:16 papering 阅读(113) 评论(0) 推荐(0) 编辑

IN()

摘要： High Performance My SQL, Third Edition Consider the followingWHERE clause: WHERE eye_color IN('brown','blue','hazel') AND hair_color IN('black','red', 阅读全文

posted @ 2016-12-23 12:14 papering 阅读(241) 评论(0) 推荐(0) 编辑

max_allowed_packet

摘要： http://dev.mysql.com/doc/refman/5.7/en/comparison-operators.html#function_in The number of values in the IN list is only limited by the max_allowed_pa 阅读全文

posted @ 2016-12-23 12:10 papering 阅读(149) 评论(0) 推荐(0) 编辑

LENGTH() CHAR_LENGTH()

摘要： http://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_length LENGTH(str) Returns the length of the string str, measured in bytes. A mu 阅读全文

posted @ 2016-12-23 12:06 papering 阅读(162) 评论(0) 推荐(0) 编辑

Rochester Memory Hardware Error Research Project

摘要： http://www.cs.rochester.edu/research/os/memerror/ 阅读全文

posted @ 2016-12-23 11:18 papering 阅读(155) 评论(0) 推荐(0) 编辑

A Realistic Evaluation of Memory Hardware Errors and Software System Susceptibility

摘要： http://www.cs.rochester.edu/~kshen/papers/usenix2010-li.pdf Abstract Memory hardware reliability is an indispensable part of whole-system dependabilit 阅读全文

posted @ 2016-12-23 11:16 papering 阅读(252) 评论(0) 推荐(0) 编辑

Calculate its MTBF assuming 2000 FITS for each DRAM

摘要： COMPUTER ORGANIZATION AND ARCHITECTURE DESIGNING FOR PERFORMANCE NINTH EDITION A common unit of measure for failure rates of electronic components is 阅读全文

posted @ 2016-12-23 10:06 papering 阅读(889) 评论(0) 推荐(0) 编辑

the computer spends over 96% of its time waiting for I/O devices to finish transferring data

摘要： COMPUTER ORGANIZATION AND ARCHITECTURE DESIGNING FOR PERFORMANCE NINTH EDITION 阅读全文

posted @ 2016-12-23 09:01 papering 阅读(132) 评论(0) 推荐(0) 编辑

2016年12月22日

bat_action

摘要：实践： 1、将 xcopy /y /d "..\bizDdl\*dll" . 当前目前的父目录下的bizDdl目录中的全部dll后缀文件复制到当前目录注释： :: rmdir /s/q website 重命名 ren 旧名称新名称 xcopy /y /d configGITignore.ini 阅读全文

posted @ 2016-12-22 19:24 papering 阅读(271) 评论(0) 推荐(0) 编辑

Diode

摘要： Diode https://zh.wikipedia.org/wiki/真空管抽真空电子在于其放射过程中，因会与空气中之组成分子相撞而产生阻力，因此电子经由如空气之类的介质来移动的话，将会比在真空状态来的困难，所以若想轻松的达成电子放射之移动过程，需将产生电子放射及电子收集之各项元件，也就是灯丝阅读全文

posted @ 2016-12-22 14:13 papering 阅读(309) 评论(0) 推荐(0) 编辑

Nobel Lecture, December 12, 1929 Thermionic phenomena and the laws which govern them

摘要： http://www.nobelprize.org/nobel_prizes/physics/laureates/1928/richardson-lecture.pdf OWEN W. RICHARDSON Thermionic phenomena and the laws which govern 阅读全文

posted @ 2016-12-22 14:01 papering 阅读(210) 评论(0) 推荐(0) 编辑

Programming In hardware Programming in software

摘要： COMPUTER ORGANIZATION AND ARCHITECTURE DESIGNING FOR PERFORMANCE NINTH EDITION 阅读全文

posted @ 2016-12-22 12:24 papering 阅读(147) 评论(0) 推荐(0) 编辑

von Neumann architecture

摘要： COMPUTER ORGANIZATION AND ARCHITECTURE DESIGNING FOR PERFORMANCE NINTH EDITION 3.1 COMPUTER COMPONENTS As discussed in Chapter 2, virtually all contem 阅读全文

posted @ 2016-12-22 12:19 papering 阅读(257) 评论(0) 推荐(0) 编辑

Syntactic_sugar

摘要： https://en.wikipedia.org/wiki/Syntactic_sugar http://stackoverflow.com/questions/11366006/mysql-on-vs-using http://dev.mysql.com/doc/refman/5.7/en/joi 阅读全文

posted @ 2016-12-22 11:23 papering 阅读(193) 评论(0) 推荐(0) 编辑

processor, memory, I/O

摘要： COMPUTER ORGANIZATION AND ARCHITECTURE DESIGNING FOR PERFORMANCE NINTH EDITION 3.3 INTERCONNECTION STRUCTURES A computer consists of a set of componen 阅读全文

posted @ 2016-12-22 09:09 papering 阅读(189) 评论(0) 推荐(0) 编辑

2016年12月20日

he time that it takes to bring a block from disk into main memory

摘要： DATABASE SYSTEM CONCEPTS, SIXTH EDITION There is a trade-off that the system designer must make between access timeand space overhead. Although the de 阅读全文

posted @ 2016-12-20 19:35 papering 阅读(174) 评论(0) 推荐(0) 编辑

How MySQL Uses Indexes CREATE INDEX SELECT COUNT(*)

摘要： MySQL :: MySQL 5.7 Reference Manual :: 9.3.1 How MySQL Uses Indexeshttps://dev.mysql.com/doc/refman/5.7/en/mysql-indexes.html CREATE INDEX SELECT COUN 阅读全文

posted @ 2016-12-20 17:14 papering 阅读(219) 评论(0) 推荐(0) 编辑

网络协议图

摘要：科来网络通讯协议图免费下载 - 科来 https://www.colasoft.com.cn/download/protocols_map.php 科来《网络通讯协议图2023版》.pdf https://www.colasoft.com.cn/wp-content/uploads/2023/07/ 阅读全文

posted @ 2016-12-20 15:51 papering 阅读(328) 评论(0) 推荐(0) 编辑

UTC ISO 8601

摘要：如果时间在零时区，并恰好与协调世界时相同，那么（不加空格地）在时间最后加一个大写字母Z。Z是相对协调世界时时间0偏移的代号。如下午2点30分5秒表示为14:30:05Z或143005Z；只表示小时和分，为1430Z或14:30Z；只表示小时，则为14Z或14Z。 def ts_to_format_s 阅读全文

posted @ 2016-12-20 13:32 papering 阅读(429) 评论(0) 推荐(0) 编辑

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(236) 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(325) 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(252) 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(244) 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(255) 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(160) 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(428) 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(1041) 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(177) 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(207) 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(221) 评论(0) 推荐(0) 编辑