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• Differences between a conceptual UML class diagram and an ERD?

  - by Adam

  If I create a conceptual class diagram such that each class captures 'name' and 'attributes' but not 'operations', have I not basically created what would be otherwise considered an ERD? I'm trying to gain an understanding of what the differences are between creating a conceptual class diagram as I have described versus calling it a ERD? If these are still two different animals, can somebody please explain what the differences are?

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• How to step down voltage from 208V to 110V

  - by Eric Dennis

  I have some racks that will be fed by 208V/20A circuits. These circuits will be conditioned and battery-backed by the facility in which these racks will live. 99% of the devices in the rack will be able to support 208V input, so I plan to use these PDUs. However, there may be one or two odd devices that will need 110V input. I know that I can use a step-down transformer to provide 110V for these devices, but that seems like overkill for such a small number of devices, plus I don't want to pay extra for the UPS functionality since my power will already be battery-backed. Any suggestions for something I can use for these one-off 110V devices?

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• what is the difference between <pubDate> and <dc:date> in feed's structure

  - by PHP-Prabhu

  can any one please let me know the main difference between <pubDate> and <dc:date> in feed's structure. also please explain <dc:date> <dc:creator> <dc:....> <dc:....> will those be required for building feeds?

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• ATI Radeon Drivers works with which linux distribution and version?

  - by amit.codename13

  I have ATI Mobility Radeon HD 5850 graphics card. Almost every new linux distribution seems to have an issue with it, when i install the drivers. Working without utilizing the graphics card leaves me so unproductive. So i made a plan to use older versions of linux, any distribution suitable as a desktop distribution. UPDATE: The kind of problems that i am facing are, 1) After installing drivers the system boots and hangs, 2) There are unusual lines over the screen 3) After upgrade system doesn't start properly(hangs the usual old way) The kind of answers i am looking for is, distribution X(the newer the version the better) doesn't have the above problem after installing drivers for ATI Mobility Radeon HD 5850 graphics card. UPDATE: The new drivers released by AMD seems to fix all the issues, although they are still beta Thanks

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• How to catch this type of exceptions ?

  - by Lukas Šalkauskas

  I'm starting getting tired of this exception. Can't handle it, even so I'm using this: AppDomain.CurrentDomain.UnhandledException += new UnhandledExceptionEventHandler(CurrentDomain_UnhandledException); Still no success, Can anyone explain me, how I should handle it in a nice way. Or how to detect that it have fired this message and close the application, because I'm starting it automatically everytime it closes.

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• MySql calculate number of connections needed

  - by Udi I

  I am trying to figure my needs regarding web service hosting. After trying Azure I have realized that the default MySql they provide (through a third party) limits the account to 4 connections. You can then upgrade the account to 15, 30 or 40 connections (which is quite expensive). Their 15 connections plan is descirbed as: "Excellent choice for light test and staging apps that need a reliable MySQL database". I have 2 questions: if my application is a web service which needs to preform ~120k Queries a day (Normal/BELL distribution) and each query is ~150ms(duration)/~400ms(fetch), how many connection do I need? If instead of using cloud computing, I will choose a VPS, how many connections will I be able to handle on a 1GB 2 cores VPS? Thank you!

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• meaning of web is stateless and http is statless protocol ?

  - by haansi

  hi, Please guide what is meaning by Web is stateless in simple words ? Kindly also explain what is meaning by HTTP is stateless protocol ? thanks

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• Displaying a list of objects with Views - Drupal

  - by RadiantHex

  Hi folks, I'll briefly explain what I'm trying to do: I need to sort a set of content-types within a paginated page. Also I need to add filtering to the page, for example each content-type should have a set of tags and the filter needs to filter through these tags. This is a basic mockup of what this page consists of: I'm finding it quite hard figuring out the best way to do it, and if this can be done. Help would be very much appreciated!!

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• Can you return an array from a JAX-WS @WebMethod?

  - by LES2

  I'm pretty sure you can, but in addition to answering the question in the title, could you also explain the pros, cons, caveats, if any, to doing so? I know that you can't return a List, Set, Collection, Map, or any interface, from a WebMethod (which is stupid, IMO, but I don't know what the design reasons were should I should probably withhold judgment). Thanks for any advice. -- LES

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• using FUNCTION instead of CREATE FUNCTION oracle pl/sql

  - by sqlgrasshopper5

  I see people writing a function with FUNCTION instead "CREATE FUNCTION". When I saw this usage in the web I thought it was a typo or something. But in Oreilly's "Oracle 11g PL/SQL Programming" by Steven Feurenstein, the author had used the same thing. But I get errors when I execute that. Could somebody explain is it legal usage or not?. Thanks.

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• Why does Javascript's OR return a value other than true/false?

  - by Fletcher Moore

  I saw this construction in order to get the browser viewport width: function () { return window.innerWidth || document.documentElement.clientWidth || document.body.clientWidth; } I understand the browser quirks involved. What I don't understand is why || returns the value. So I tried this alert(undefined || 0 || 3); and sure enough, it alerts 3. I find this bizarre, because I expect true or false. Could anyone explain what's going on?

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• how to find the address of data in memory?

  - by blood

  i need to find a way how to find the address's for value of another program. i find the address before hand but i don't know how to find them again after i close and reopen the program with out searching for them again (i need the program to find them on it's own). anyone know how i can do this (sorry if im unclear i don't know how to explain it really) if your confused just ask and i'll try to make it clear im using C++

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• why does an infinite loop trash the CPU?

  - by user342673

  I know an infinite loop creates a CPU problem. But, I don't quite understand why. Can anyone explain that to me. Thanks!

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• NSDecimalNumber multiplication strangeness

  - by rein

  ExclusivePrice, quantity are both NSDecimalNumbers. NSDecimalNumber *price = [exclusivePrice decimalNumberByMultiplyingBy:quantity]; NSLog(@"%@ * %@ = %@", exclusivePrice, quantity, price); The result I get: 2010-04-05 00:22:29.111 TestApp[13269:207] 65 * 2 = -0.0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000007169919476068871316457914368 What I expected: 2010-04-05 00:22:29.111 TestApp[13269:207] 65 * 2 = 130 Can anyone explain this please?

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• CPU sometimes hangs at 50% maximum on Windows 8

  - by Martin.

  Recently I installed Windows 8 on my HP ProBook 6450b and it appears I've got problems when using more than one program at once. Sometimes, when I run multiple programs at once, CPU hangs at 49% and never goes up. I suspect it has something to do with CPU throttling, because sometimes it just goes over 49%. I've got my notebook connected to charger and my plan is set to "Active cooling". The weird thing is that this happens only occasionally. I found nothing in my BIOS that could change this kind of things.

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• replace controller, add second controller, or use expander?

  - by longneck

  I have a Proliant DL380 G6 that I am re-purposing as a Hyper-V host for a new, off-site data center that will host our DR services. The server currently has a P410i controller with the 512MB BBWC module. The drives installed are SFF 6G 10K drives. I plan to add the HP 516914-B21 drive cage, which gives me 8 more SFF drives, bringing the total to 16. To get the additional 8 drives connected, I have one of three choices: Install a new controller that can support 16 drives. Install a second controller. Install a SAS expander, such as the HP 468406-B21 recommended by HP's spec sheet for my server. My question is: how do I know if I'm going hit a performance ceiling by putting 16 drives on the P410i or using the expander? And if I am, how do I select an appropriate controller? I'm not sure what specifications I should be looking at.

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• Unit testing ASP.NET Code behind.

  - by user102533

  I've been reading about MVC in which the authors suggest that testability is one of the major strengths of MVC. They go to compare it with ASP.NET WebForms and how difficult it is to test the code behind in WebForms. I do understand it's difficult but can someone explain how unit tests were written to test code behind logic in the old days?

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• Vacation scheduler/viewer

  - by Norfeldt

  I'm looking for a solution that allows multiple persons to put plan and notify their vacation by putting it in their electronic calendar and invite a dedicated "robot" email. On the other side I should be able to get a quick overview of the vacation for each person and do a print out that allows me to put it on a board. Example: John puts his winter vacation for week 7 into his calendar and invite [email protected]. Ben does the same thing for week 4 and 5 and invites [email protected]. Dilbert host the [email protected] and prints out and overview for the next 3 months. Each person's vacation is either stated by name or/and color on the print out. I would like to do the thing with standard business software like Outlook 2010 without installing too many softwares. But at the same time it should be easy and quick to make the print outs without too much fiddling Am I dreaming ?

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• RAID--0 " TWO " DRIVES SSD ONLY Should I use on-board / Software RAID OR a RAID Card / Control

  - by Wes

  I am looking at going with a TWO Drive Only SSD RAID-0 Configuration And was wondering if I would get better performance / Speed from the Use of a RAID Controller / Card Verses just using the Software RAID on my Mother Board. I have herd conflicting reports , Again I only Plan on Running " 2 " SSD Drives in RAID-0 Config I have No- problem spending the extra money for a good controller but only if I am going to benifit performance wise , Otherwise if there is no notable Gain I will just use the Software RAID that my HP-180-T came with Intel- 3.33 GHZ , 6-Core , 12-GB of DDR-3. I have a huge External drive for All Storage and am not concerned about Data loss just looking for pure speed. And if a Controller will benifit my performance Wht type of card would one suggest?

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• Can somebody suggest good source for IMS?

  - by Raja Reddy

  I would like to learn working with IMS, can somebody suggest me a good source? I'm not sure if it matters to say that I have quite good exposure and experience with INSYNC DB2 and QMF. So anything that can depict and explain the advantages and disadvantages over IMS would be really helpful. Thanks for your help beforehand..

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• UITableView Reusable cells

  - by Michael

  Can someone explain me the way reusable cells works for single table view? How many reusable cells a datasource should create? So far in all samples I've seen only one. Would one even need more?

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• What's the difference of echo,print,print_r in PHP?

  - by Mak

  I use echo and print_r much,almost never use print. I feel echo is a macro,and print_r is alias of var_dump. But that's not the standard way to explain the difference.

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• Load test results VSTS 2008

  - by Julia

  Can anybody explain why load test result on Graph are different form load test result on Table Page. If compare Min and Avg page response time they are the same. But if we compare figures in Max column they are different for the same page and the same load rest run. see linked images for more details. http://cid-ee8b34c203174724.skydrive.live.com/self.aspx/.Public/3.png

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• help with javamail api

  - by bobbyblue

  can anybody explain me what does this line mean in javamail api..it it used to setup a mail server..but i cant understand it props.put("mail.smtp.host", host);

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• Seeking a solution to automatically copy files from the cd-rom disk to the USB drive once it's connected.

  - by Ray Nathan

  I plan to distribute a free CD that automatically copies files to a connected usb device. This process will be done on the computers of the users that obtain the cd. The CD will contain an autorun.ini file that will instruct the computer to copy a set of files located on the cd..to a specific directory on the connected usb device. The usb drive letter is not the same on all the systems, therefore...Windows XP should automatically know the drive letter of the usb device before the copy operation begins. What would be the best way of creating a short batch file or script that I can place on the CD to execute this process? Also, please note that it is NOT feasible or recommended to include a batch file on the USB devices to sync this operation due to the explanation at the beginning of this paragraph. :) Thank You All

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