z****a
发帖数: 1 | 1 以满足轻量级数据在win32平台上的快速访问
打算用C++编写, 同时兼容SQL89和OQL
相信这个dbms的编写成功会给很多软件带来一个有利的工具
现在暂定有以下计划:
1) 支持多进程(多线程)同时操作
2) 暂时不支持用户的概念
3) 支持"角色表"的概念,可对数据操作和查询进行权限认定
4) 强壮的文件管理系统,尽量减少crash给系统带来的副面影响 保证数据的完整
性
5) 暂时不支持锁定和事务处理
6) 对OQL的有限支持,使得开发者可以使用更加直观的OQL语言进行查询
7) 其他小型数据库的性能指标(尤其强调的是速度和稳定性)
8) 整个dbms server可执行文件小于2M,便于携带提供在低性能机器上的高性能表
现
9) 给程序员一套完整的接口,包括有C/C++/COM接口和ODBC驱动程序
10)在稳定的基础上根据实际需要在未来适当扩充,但仍然遵循一条原则:
"small is beautiful"
11)除非非常非常非常有必要,不会移植到windows以外的系统上.一方面是因为
本dbms格守其设计目标:win平台上的轻量级数据库系统,另一方面是因为其他平台
上 |
|
b***n
发帖数: 13455 | 2 dBm = 10*log(Power/1mW), so 0 dBm = 1mW |
|
z****g
发帖数: 2497 | 3 In SQL Server or other DBMS, is there anything like
relationship in MS Access?
谢谢.
Thanks! |
|
B*****g
发帖数: 34098 | 4 我对cloud里的DB很感兴趣。可是不太清楚，个人认为成本很关键吧，就是用DBMS也不
会有人用oracle／sqlserver。有没有大牛给将将。 |
|
c*****d
发帖数: 6045 | 5 用C++写code对DB操作还是写DBMS？
这个差别大了 |
|
w**z
发帖数: 8232 | 6 Look at this overall ranking:
http://db-engines.com/en/ranking
shall we all move to MS SQL Server since it's up 20% for last month?
Rank Last Month DBMS Database Model Score Changes
1. 1. Oracle Relational DBMS 1467.79 -0.26
2. 2. MySQL Relational DBMS 1296.91 -12.38
3. 3. Microsoft SQL Server Relational DBMS 1226.02 +20.
14
4. 4. PostgreSQL Relational DBMS 228.25 -2.71
5. 5. DB2 Relation... 阅读全帖 |
|
w*******y
发帖数: 60932 | 7 Cisco Valet M10 Wireless BroadBand Router 54Mbps 802.11N M10-RM
This item is Cisco Certified Refurbished
Cisco Valet M10 300Mbps Wireless N Router with Parental controls, Easy Setup
USB Key Included for PC and MAC, Cisco Recertified
Manufacturer Part # M10
Features/Specifications:
General Features:
Broadband router
Wireless Access Point
Four port 10/100 Ethernet switch
Complies with IEEE 802.11n as well as IEEE 802.11b/g
2.4 GHz operating frequency
Supports WEP & WPA2 wir... 阅读全帖 |
|
A***g
发帖数: 158 | 8 发信人: chrs (胖胖), 信区: database
标 题: 数据库入门知识之1.(数据库系统简介)
发信站: 西北网络中心兵马俑 BBS 站 (Thu Dec 24 13:57:47 1998)
数据库系统为我们提供了一种把与我们的工作和生活紧密相关
的信息集合在一起的方法，它还提供了在某个集中的地方存储
和维护这些信息的方法。数据库系统主要由三大部分组成：数
据库管理系统（DBMS:它是专门负责组织和管理数据信息的程序）、
数据库应用程序（它使我们能够获取、显示和更新由DBMS存储的
数据）、数据库（按一定结构组织在一起的相关数据的集合）。
一般来说，DBMS和数据库应用程序都驻留在同一台计算机上并在
同一台计算机上运行，很多情况下两者甚至结合在同一个程序中
，以前使用的大多数数据库系统都是用这种方法设计的。但是
随着DBMS技术的发展，目前的数据库系统正向客户/服务器模式
发展。客户/服务器数据库将DBMS和数据库应用程序分开，从而
提高了数据库系统的处理能力。数据库应用程序运行在一个或
多个用户工作站（客户机）上，并且通过网络与运行在其它计
算机上（服务器）的一个或多个D |
|
A***g
发帖数: 158 | 9 数据库应用程序
DBMS中存储了大量的数据信息，其目的是为用户提供数据信息服务，
而数据库应用程序正是与DBMS进行通信，并访问DBMS中的数据，它
是DBMS实现其对外提供数据信息服务这一目的的唯一途径。简单地
说，数据库应用程序是一个允许用户插入、修改、删除并报告数
据库中的数据的计算机程
序。数据库应用程序在传统上是由程序员用一种或多种通用或专用
的程序设计语言编写的，但是近年来出现了多种面向用户的数据库
应用程序开发工具，这些工具可以简化使用DBMS的过程，并且不需
要专门编程。Delphi就是一种强有力的数据库应用程序开发工具。
用来生成数据库应用程序的语言主要分为三大类型:
1.过程化语言
计算机程序设计语言如Pascal、Basic和C都是过程化语言，这些
语言可以通过某种"应用程序接口"（API）来创建数据库应用程序
，这种API由一组标准的函数（或调用）组成，这些函数和调用则
扩展了语言的功能，使之能访问数据库中的数据。当程序设计人员
用过程化语言创建数据库应用时，必须把应用的代码编写成一系列
的过程，每个过程执行应用的某一部分的工作，如一个过程查询数
据库，而另一过 |
|
x***h
发帖数: 8 | 10 the 1st reason you want DBMS is index. DBMS can give you B-Tree
and hash index. They are not easy to impl manually.
the 2nd reason you want DBMS is query language. writing SQL
is much more easier and portable than trying to figure out
detailed low level operations every time.
the 3rd reason you want DBMS is transaction. If several people
will access your data at the same time, you probably don't want
their operations interwined with each other.
the 4th reason you want DBMS is logging. When windo |
|
i*****n
发帖数: 130 | 11 What confused you, are the "real Signal/Noise level" vs. the "Displayed
Signal/Noise level".
对于一个测试仪器来说，它要直观地告诉你的，是你接入它的INPUT PORT的信号是多少
。这就是为什么外接ATTENUATOR的时候，屏幕上显示的信号也被ATTENUATE了，因为对
测试仪器来说，这些都属于INPUT PORT外部的东西，它本来就应该告诉你＂你的信号被
你外接的ATTENUATOR＂给ATTENUATE了。
但对于仪器内部的ATTENUATOR，情况就是两码事。你如果接入INPUT PORT的信号高达３
０DBM，它需要告诉你的，就应该是３０DBM。但是为了保护仪器，或测量精度等原因，
你需要改变仪器的设置。比如，加了１０DB内置ATTENUATOR，此时，实际被测量到的信
号被你内置的ATTENUATOR降了１０个DB，但它所显示的信号强度，还是你接入的３０
DBM，告诉你：我准确地测量了你接入的信号强度－３０DBM。
可是这时候就带来一个问题，因为实际SIGNAL被降了１０DB，但... 阅读全帖 |
|
t****e
发帖数: 4821 | 12 WiFi 信号强度应该是我用过的所有路由里最强的了，大概 5 米远隔一道墙，2.4GHz
信号达到 Signal / Noise: -27 dBm / -92 dBm， 5GHz 信号达到：Signal / Noise:
-36 dBm / -88 dBm，同一位置从来没见过这么强的信号。
这个新神由的 USB 外接盘速度还是还不错的，我挂了个 2TB 的 WD 外接盘上去，从笔
记本上通过无线网试了试大文件拷贝，速度能达到差不多 10MB/s。不过外接盘的安全
性有待加强，外接盘挂上后缺省局域网内所有设备就都有 Full Access，有点不靠谱。 |
|
f***y
发帖数: 4447 | 13 蒙古还是回归中国算了
http://finance.sina.com.cn/stock/usstock/c/2017-02-16/doc-ifyarrqs9860610.shtml
新浪美股讯 北京时间16日早间路透社称，穆迪周三将蒙古列入“评级负面观察”名单
，意味着未来有可能下调该国主权信用评级，原因是担心即将到期的一笔5.80亿美元政
府支持债券可能违约。
穆迪表示，将在未来三个月内决定是否下调蒙古评级，此前不到半年内，该评级机
构已两次下调蒙古评级，去年11月将该国评级下调至“Caa1”，属于垃圾级别。
蒙古开发银行（DBM）的这批债券将于3月21日到期，但有人担心该行没有足够资金
偿还，可能需要蒙古政府介入。蒙古政府一直在与中国以及国际货币基金组织（IMF）
商谈援助事宜，但投资者担心救助协议可能无法及时达成。
穆迪表示，DBM债券“不可撤销和无条件的政府担保”意味着其将考虑把这笔债券
的逾期偿还视作一次主权违约事件。
该评级机构周三表示，如果其认为蒙古政府帮助DBM偿还债务的行动“将损害政府
自己的信用状况和借款能力，包括耗尽其外汇储备，”那么将进一步下调该国的主权信
用评... 阅读全帖 |
|
d**m
发帖数: 50 | 14 Big Finance Company which located in New York City urgently needs 6 Database
Administrators with entry level. This is full time positions. You must be
quick learner. If you are interested in this position, please send your
resume in Word format to [email protected]
/* */
Job Description:
Provide assistance and support to higher level staff through database design
and data Integration.
Serve as part of a project team to develop and document data
Consult with Senior Analysts Database Managem... 阅读全帖 |
|
w*****n
发帖数: 6 | 15 This Company which located in the NYC urgently needs 3 Database
Administrators with Junior Level. If you are interested in this position and
have graduated from school, (You must be available immediately) please send
your resume in Word format to h*********[email protected]
Job Description:
• Provide assistance and support to higher level staff through
database design and data Integration.
• Serve as part of a project team to develop and document data
• Consult with Senior Analysts... 阅读全帖 |
|
w*****n
发帖数: 6 | 16 This Company which located in the NYC urgently needs 3 Database
Administrators with Junior Level. If you are interested in this position and
have graduated from school, (You must be available immediately) please send
your resume in Word format to h*********[email protected]
Job Description:
• Provide assistance and support to higher level staff through
database design and data Integration.
• Serve as part of a project team to develop and document data
• Consult with Senior Analysts... 阅读全帖 |
|
d**m
发帖数: 50 | 17 Big Finance Company which located in New York City urgently needs 6 Database
Administrators with entry level. This is full time positions. You must be
quick learner. If you are interested in this position, please send your
resume in Word format to [email protected]
/* */
Job Description:
Provide assistance and support to higher level staff through database design
and data Integration.
Serve as part of a project team to develop and document data
Consult with Senior Analysts Database Managem... 阅读全帖 |
|
d**m
发帖数: 50 | 18 Big Finance Company which located in New York City urgently needs another 2
Database Administrators with entry level. This is full time positions. You
must be quick learner. If you are interested in this position, please send
your
resume in Word format to [email protected]
/* */
Job Description:
Provide assistance and support to higher level staff through database design
and data Integration.
Serve as part of a project team to develop and document data
Consult with Senior Analysts Database... 阅读全帖 |
|
d**m
发帖数: 50 | 19 Big Finance Company which located in New York City urgently needs one
Database Administrators with entry level. This is full time positions. You
must be quick learner. If you are interested in this position, please send
your resume in Word format to [email protected]
/* */
Job Description:
Provide assistance and support to higher level staff through database design
and data Integration.
Serve as part of a project team to develop and document data
Consult with Senior Analysts Database Manag... 阅读全帖 |
|
d**m
发帖数: 50 | 20 Big Finance Company which located in New York City urgently needs three
Database Administrators with entry level. This is full time positions. You
must be quick learner. If you are interested in this position, please send
your resume in Word format to [email protected]
/* */
Job Description:
Provide assistance and support to higher level staff through database design
and data Integration.
Serve as part of a project team to develop and document data
Consult with Senior Analysts Database Man... 阅读全帖 |
|
w*****n
发帖数: 6 | 21 This Company which located in the NYC urgently needs 3 Database
Administrators with Junior Level. If you are interested in this position and
have graduated from school, (You must be available immediately) please send
your resume in Word format to h*********[email protected]
Job Description:
• Provide assistance and support to higher level staff through
database design and data Integration.
• Serve as part of a project team to develop and document data
• Consult with Senior Analysts... 阅读全帖 |
|
w*****n
发帖数: 6 | 22 This Company which located in the NYC urgently needs 3 Database
Administrators with Junior Level. If you are interested in this position and
have graduated from school, (You must be available immediately) please send
your resume in Word format to h*********[email protected]
Job Description:
• Provide assistance and support to higher level staff through
database design and data Integration.
• Serve as part of a project team to develop and document data
• Consult with Senior Analysts... 阅读全帖 |
|
d**m
发帖数: 50 | 23 Big Finance Company which located in New York City urgently needs 6 Database
Administrators with entry level. This is full time positions. You must be
quick learner. If you are interested in this position, please send your
resume in Word format to [email protected]
/* */
Job Description:
Provide assistance and support to higher level staff through database design
and data Integration.
Serve as part of a project team to develop and document data
Consult with Senior Analysts Database Managem... 阅读全帖 |
|
d**m
发帖数: 50 | 24 Big Finance Company which located in New York City urgently needs three
Database Administrators with entry level. This is full time positions. You
must be quick learner. If you are interested in this position, please send
your resume in Word format to [email protected]
/* */
Job Description:
Provide assistance and support to higher level staff through database design
and data Integration.
Serve as part of a project team to develop and document data
Consult with Senior Analysts Database Man... 阅读全帖 |
|
d**m
发帖数: 50 | 25 Big Finance Company which located in New York City urgently needs three
Database Administrators with entry level. This is full time positions. You
must be quick learner. If you are interested in this position, please send
your resume in Word format to [email protected]
/* */
Job Description:
Provide assistance and support to higher level staff through database design
and data Integration.
Serve as part of a project team to develop and document data
Consult with Senior Analysts Database Man... 阅读全帖 |
|
I*D
发帖数: 40035 | 26 Role Title Description Start Date End Date Status Level From
Level To Standard Role Work Location Role Specialty 1 Level 1
Role Specialty 1 Level 2 Role Specialty 1 Level 3 Role Specialty 1
Level 4 Role Specialty 1 Level 5 Skill & Proficiency
PeopleSoft Administrator This person will be part of a team that supports
a PeopleSoft Financial system with several associated custom applications
and batches using ASP .NET, Hyperion, PL/SQL, SQL, and SQR. This ... 阅读全帖 |
|
d**m
发帖数: 50 | 27 Big Finance Company which located in New York City urgently needs 6 Database
Administrators with entry level. This is full time positions. You must be
quick learner. If you are interested in this position, please send your
resume in Word format to [email protected]
/* */
Job Description:
Provide assistance and support to higher level staff through database design
and data Integration.
Serve as part of a project team to develop and document data
Consult with Senior Analysts Database Managem... 阅读全帖 |
|
d**m
发帖数: 50 | 28 Big Finance Company which located in New York City urgently needs 6 Database
Administrators with entry level. This is full time positions. You must be
quick learner. If you are interested in this position, please send your
resume in Word format to [email protected]
/* */
Job Description:
Provide assistance and support to higher level staff through database design
and data Integration.
Serve as part of a project team to develop and document data
Consult with Senior Analysts Database Managem... 阅读全帖 |
|
d**m
发帖数: 50 | 29 Big Finance Company which located in New York City urgently needs another 2
Database Administrators with entry level. This is full time positions. You
must be quick learner. If you are interested in this position, please send
your
resume in Word format to [email protected]
/* */
Job Description:
Provide assistance and support to higher level staff through database design
and data Integration.
Serve as part of a project team to develop and document data
Consult with Senior Analysts Database... 阅读全帖 |
|
d**m
发帖数: 50 | 30 Big Finance Company which located in New York City urgently needs one
Database Administrators with entry level. This is full time positions. You
must be quick learner. If you are interested in this position, please send
your resume in Word format to [email protected]
/* */
Job Description:
Provide assistance and support to higher level staff through database design
and data Integration.
Serve as part of a project team to develop and document data
Consult with Senior Analysts Database Manag... 阅读全帖 |
|
d**m
发帖数: 50 | 31 Big Finance Company which located in New York City urgently needs 6 Database
Administrators with entry level. This is full time positions. You must be
quick learner. If you are interested in this position, please send your
resume in Word format to [email protected]
/* */
Job Description:
Provide assistance and support to higher level staff through database design
and data Integration.
Serve as part of a project team to develop and document data
Consult with Senior Analysts Database Managem... 阅读全帖 |
|
d**m
发帖数: 50 | 32 Big Finance Company which located in New York City urgently needs another 2
Database Administrators with entry level. This is full time positions. You
must be quick learner. If you are interested in this position, please send
your
resume in Word format to [email protected]
/* */
Job Description:
Provide assistance and support to higher level staff through database design
and data Integration.
Serve as part of a project team to develop and document data
Consult with Senior Analysts Database... 阅读全帖 |
|
d**m
发帖数: 50 | 33 Big Finance Company which located in New York City urgently needs one
Database Administrators with entry level. This is full time positions. You
must be quick learner. If you are interested in this position, please send
your resume in Word format to [email protected]
/* */
Job Description:
Provide assistance and support to higher level staff through database design
and data Integration.
Serve as part of a project team to develop and document data
Consult with Senior Analysts Database Manag... 阅读全帖 |
|
d**m
发帖数: 50 | 34 Big Finance Company which located in New York City urgently needs three
Database Administrators with entry level. This is full time positions. You
must be quick learner. If you are interested in this position, please send
your resume in Word format to [email protected]
/* */
Job Description:
Provide assistance and support to higher level staff through database design
and data Integration.
Serve as part of a project team to develop and document data
Consult with Senior Analysts Database Man... 阅读全帖 |
|
d**m
发帖数: 50 | 35 Big Finance Company which located in New York City urgently needs three
Database Administrators with entry level. This is full time positions. You
must be quick learner. If you are interested in this position, please send
your resume in Word format to [email protected]
/* */
Job Description:
Provide assistance and support to higher level staff through database design
and data Integration.
Serve as part of a project team to develop and document data
Consult with Senior Analysts Database Man... 阅读全帖 |
|
d**m
发帖数: 50 | 36 Big Finance Company which located in New York City urgently needs 6 Database
Administrators with entry level. This is full time positions. You must be
quick learner. If you are interested in this position, please send your
resume in Word format to [email protected]
/* */
Job Description:
Provide assistance and support to higher level staff through database design
and data Integration.
Serve as part of a project team to develop and document data
Consult with Senior Analysts Database Managem... 阅读全帖 |
|
i**s
发帖数: 97 | 37 Seems you are confused by these concepts.
1. Java has nothing to do with Javascript.
2. JDBC is Java's API to SQL database.
3. If you write ASP program, you can use both VBScript
and Javascript to access ODBC data source.
4. If DBMS and Web server reside in different machines,
it is perfect for ODBC to work. You need to build an
ODBC data source in the machine where web server runs,
while the ODBC specifies the DBMS running in another machine.
5. If you write Java Applet, DBMS should |
|
d**m
发帖数: 50 | 38 Big Finance Company which located in New York City urgently needs 6 Database
Administrators with entry level. This is full time positions. You must be
quick learner. If you are interested in this position, please send your
resume in Word format to [email protected]
/* */
Job Description:
Provide assistance and support to higher level staff through database design
and data Integration.
Serve as part of a project team to develop and document data
Consult with Senior Analysts Database Managem... 阅读全帖 |
|
j****y
发帖数: 178 | 39 lo no wireless extensions.
eth0 no wireless extensions.
这个是现在连接到开放网络 belkin54g时候的情况：
wlan0 IEEE 802.11g ESSID:"belkin54g"
Mode:Managed Frequency:2.412 GHz Access Point: 00:1C:DF:FC:56:18
Bit Rate=5.5 Mb/s Tx-Power:32 dBm
RTS thr:2347 B Fragment thr:2346 B
Power Management:off
Link Quality:26/100 Signal level:-79 dBm Noise level:-96 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx |
|
d**m
发帖数: 50 | 40 Big Finance Company which located in New York City urgently needs 6 Database
Administrators with entry level. This is full time positions. You must be
quick learner. If you are interested in this position, please send your
resume in Word format to [email protected]
/* */
Job Description:
Provide assistance and support to higher level staff through database design
and data Integration.
Serve as part of a project team to develop and document data
Consult with Senior Analysts Database Managem... 阅读全帖 |
|
d**m
发帖数: 50 | 41 Big Finance Company which located in New York City urgently needs 6 Database
Administrators with entry level. This is full time positions. You must be
quick learner. If you are interested in this position, please send your
resume in Word format to [email protected]
/* */
Job Description:
Provide assistance and support to higher level staff through database design
and data Integration.
Serve as part of a project team to develop and document data
Consult with Senior Analysts Database Managem... 阅读全帖 |
|
d**m
发帖数: 50 | 42 Big Finance Company which located in New York City urgently needs another 2
Database Administrators with entry level. This is full time positions. You
must be quick learner. If you are interested in this position, please send
your
resume in Word format to [email protected]
/* */
Job Description:
Provide assistance and support to higher level staff through database design
and data Integration.
Serve as part of a project team to develop and document data
Consult with Senior Analysts Database... 阅读全帖 |
|
d**m
发帖数: 50 | 43 Big Finance Company which located in New York City urgently needs one
Database Administrators with entry level. This is full time positions. You
must be quick learner. If you are interested in this position, please send
your resume in Word format to [email protected]
/* */
Job Description:
Provide assistance and support to higher level staff through database design
and data Integration.
Serve as part of a project team to develop and document data
Consult with Senior Analysts Database Manag... 阅读全帖 |
|
d**m
发帖数: 50 | 44 Big Finance Company which located in New York City urgently needs three
Database Administrators with entry level. This is full time positions. You
must be quick learner. If you are interested in this position, please send
your resume in Word format to [email protected]
/* */
Job Description:
Provide assistance and support to higher level staff through database design
and data Integration.
Serve as part of a project team to develop and document data
Consult with Senior Analysts Database Man... 阅读全帖 |
|
d**m
发帖数: 50 | 45 Big Finance Company which located in New York City urgently needs 6 Database
Administrators with entry level. This is full time positions. You must be
quick learner. If you are interested in this position, please send your
resume in Word format to [email protected]
/* */
Job Description:
Provide assistance and support to higher level staff through database design
and data Integration.
Serve as part of a project team to develop and document data
Consult with Senior Analysts Database Managem... 阅读全帖 |
|
d**m
发帖数: 50 | 46 Big Finance Company which located in New York City urgently needs another 2
Database Administrators with entry level. This is full time positions. You
must be quick learner. If you are interested in this position, please send
your
resume in Word format to [email protected]
/* */
Job Description:
Provide assistance and support to higher level staff through database design
and data Integration.
Serve as part of a project team to develop and document data
Consult with Senior Analysts Database... 阅读全帖 |
|
d**m
发帖数: 50 | 47 Big Finance Company which located in New York City urgently needs one
Database Administrators with entry level. This is full time positions. You
must be quick learner. If you are interested in this position, please send
your resume in Word format to [email protected]
/* */
Job Description:
Provide assistance and support to higher level staff through database design
and data Integration.
Serve as part of a project team to develop and document data
Consult with Senior Analysts Database Manag... 阅读全帖 |
|
d**m
发帖数: 50 | 48 Big Finance Company which located in New York City urgently needs three
Database Administrators with entry level. This is full time positions. You
must be quick learner. If you are interested in this position, please send
your resume in Word format to [email protected]
/* */
Job Description:
Provide assistance and support to higher level staff through database design
and data Integration.
Serve as part of a project team to develop and document data
Consult with Senior Analysts Database Man... 阅读全帖 |
|
d**m
发帖数: 50 | 49 Big Finance Company which located in New York City urgently needs three
Database Administrators with entry level. This is full time positions. You
must be quick learner. If you are interested in this position, please send
your resume in Word format to [email protected]
/* */
Job Description:
Provide assistance and support to higher level staff through database design
and data Integration.
Serve as part of a project team to develop and document data
Consult with Senior Analysts Database Man... 阅读全帖 |
|
