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• please suggest mysql query for this

  - by I Like PHP

  I HAVE TWO TABLES shown below table_joining id join_id(PK) transfer_id(FK) unit_id transfer_date joining_date 1 j_1 t_1 u_1 2010-06-05 2010-03-05 2 j_2 t_2 u_3 2010-05-10 2010-03-10 3 j_3 t_3 u_6 2010-04-10 2010-01-01 4 …

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• Separating code logic from the actual data structures. Best practices?

  - by Patrick

  I have an application that loads lots of data into memory (this is because it needs to perform some mathematical simulation on big data sets). This data comes from several database tables, that all refer to each other. The consistency rules on the data are rather complex, and looking up all the relevant data requires quite some hashes and other…

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• The Sensemaking Spectrum for Business Analytics: Translating from Data to Business Through Analysis

  - by Joe Lamantia

  One of the most compelling outcomes of our strategic research efforts over the past several years is a growing vocabulary that articulates our cumulative understanding of the deep structure of the domains of discovery and business analytics. Modes are one example of the deep structure we’ve found.  After looking at discovery…

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• What does 'Highest active time' for disk activity in Windows resource monitor mean?

  - by Nick R

  I know what the disk io, disk queue length and other measures are, but what does 'Highest active time' mean? Is it the amount of time it is busy handling requests, or something else? When it is high, does it mean the CPU is busy doing some IO work, or is it just indicating that the disk is busy handling requests? I'm trying to work…

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• Does Hotspot Shield hide my activity from my ISP?

  - by test

  Can Hotspot Shield make your activities invisible to your ISP? Or can they still see what you're downloading if they so choose? Here's the text from the product description: Hotspot Shield protects your entire web surfing session; securing your connection at both your home Internet network & Public Internet networks (both…

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• What does %st mean in top?

  - by Ben

  Here is an example from my top: Cpu(s): 6.0%us, 3.0%sy, 0.0%ni, 78.7%id, 0.0%wa, 0.0%hi, 0.3%si, 12.0%st I am trying to figure out the significance of the %st field. I read that it means steal cpu and it represents time spent by the hypervisor, but I want to know what that actually means to me. Does it mean I may be on a…

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• AWS RDS connection count

  - by wmarbut

  I am using AWS RDS with MySQL for a project and have a "large" instance. The documentation is clear on what this means as far as compute resources and RAM goes, but I can't find anything that documents how many open database connections that I can have. The app that I am using is PHP and it utilizes PDO with persistent…

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• What is meant by "streaming data access" in HDFS?

  - by Van Gale

  According to the HDFS Architecture page HDFS was designed for "streaming data access". I'm not sure what that means exactly, but would guess it means an operation like seek is either disabled or has sub-optimal performance. Would this be correct? I'm interested in using HDFS for storing audio/video files that need…

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• Clickonce applications being allowed through firewall

  - by DanielF

  The company I work for uses an application that is deployed through clickonce. This means that everytime they update said program the program regenerates in a new location ie: C:\Users\%username%\AppData\Local\Apps\2.0\89XCT43D.10T\WBZ8WE7L.927\trm8..tion_1ad39bb503bcb5df_0008.0005_14829906c9aa8611\%appname%.exe …

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• OpenVPN performance: how many concurrent clients are possible?

  - by Steffen Müller

  I am evaluating a system for a client where many OpenVPN clients connect to a OpenVPN server. "Many" means 50000 - 1000000. Why do I do that? The clients are distributed embedded systems, each sitting behind the system owners dsl router. The server needs to be able to send commands to the clients. My first naive…

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• Gmail & yahoo - offline mail viewer for mac osx

  - by sagar

  Hello ! Every one. My question are divided into two parts ----------------------- 1 ---------------------------- I am having a difficulty regarding receiving my mails. I have 3 gmail accounts & 1 yahoo account. In windows, I use Microsoft outlook or microsoft outlook express. But In mac is there any…

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• Could we build a mega-processor out of superconductors?

  - by Carson Myers

  A superconductor, once cooled below a critical temperature, loses all of its electrical resistance and therefore becomes 100% efficient. This means that when a current flows through a superconductor, none of the energy is lost to heat or light. Theoretically, could we build a processor out of…

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• SQL Server High Availability - Mirroring with MSCS?

  - by David

  I'm looking at options for high-availability for my SQL Server-powered application. The requirements are: HA protection from storage failure. Data accessibility when one of the DB servers is undergoing software updates (e.g. planned outage for Windows Update / SQL Server service-packs).…

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• Web authentication using LDAP and Apache?

  - by Stephen R

  I am working on a project of setting up a web administered inventory database for my work (or if they don't want it then i'll enjoy learning about it) and hit the problem of allowing only authorized users to access the website (In its testing/development phase, I allow all people to…

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• Browsers with good keyboard support

  - by egon

  What browsers have good keyboard support? That means you don't have to use the mouse so much. Or what is a good setup for browser + keyboard interaction. I know the basic keyboard shortcuts (tab switching, new tabs etc.) but I don't know a good way to switch between links and…

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• Will open files limit in Centos affect HTTP connections? Does the limit apply to a single session or all sessions?

  - by forestclown

  When I do a ulimit -n I got 256, I assume it means I can open 256 files at the sametime. Does it means I can open 256 files with one single session? or all sessions? For example, I logined to my server with username "abc" (via putty/ssh), and open 200 files, with the session…

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• What does S in linux file properties mean?

  - by penguin

  I'm creating directories and changing the permissions of them in perl with the following code: umask 0000; mkdir $path, 0770; chown $userid, $groupid, $path; Now when I do ls -l on a directory I've just created, they are as follows: drwxrws--- 2 user group 4096 Nov 3…

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• Send individual e-mails to each contact in Gmail?

  - by Robert C. Cartaino

  I'm trying to send an e-mail to a group of contacts in Gmail (200 recipients, no spam). Is there a way to force Gmail to send the e-mail as 200 individual e-mails, each addressed to that specific person in the list? But I'm trying to protect their privacy: Sending to a…

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• Proper 16:9 video size for non-HD 4:3 video (for youtube/vimeo)

  - by Xeoncross

  Since High Definition video came out on all the online sites it has changed the default aspect ratio of the player from 4:3 to 16:9. This means that for people posting SD video you have to resize some of your videos to get them to fit right. For example, NTSC DVD quality…

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• Snow Leopard Permissions in Shared Folders reset on saving file

  - by jan

  I have several users who access their accounts on OSX through their windows machines over samba. As soon as they update/save a file, it sets the permissions to -rwxr----- which means no other users can read the files. This affects apache user, for example, so changes to…

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• PHPMyAdmin on Ubuntu: Connection for controluser as defined in your configuration failed.

  - by silent

  As subject, my phpmyadmin installation on ubuntu have that error, did you know what it means and how to solve it?

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• Admin mode on Procurve Switches

  - by stefan.at.wpf

  Not being a network expert, I spent some time configuring my network, until I found my mistake: On my HP ProCurve Switch 1810G, I thought that "Admin mode" means whether the administrative interface can be accessed from this port. Well, it means whether the port is…

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• How to protect an OS X Server from an anautorized physical connection?

  - by GJ

  Hi I have an OS X 10.6 server, which I administer via SSH and VNC (via SSH tunnel). I can't leave it at the login window since then VNC connections are refused. Therefore I currently leave it logged with my user account. Since it doesn't have a monitor…

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• Is this a normal operating temperature range for a New Third-Generation MacBook Air (2.13 MHz, 120 G

  - by doug

  Even with just my text editor open (no web browser) and maybe the terminal, the baseline temperature is usually above 40 C. When i open 4-5 browser tabs in Safari (even if none of Sites have Flash) the temp can quickly go over 50 C. (In addition, i am…

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• How to protect an OS X Server from an unauthorized physical connection?

  - by GJ

  Hi I have an OS X 10.6 server, which I administer via SSH and VNC (via SSH tunnel). I can't leave it at the login window since then VNC connections are refused. Therefore I currently leave it logged with my user account. Since it doesn't have a…

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