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• MongoDB: What's the point of using MapReduce without parallelism?

  - by netvope

  Quoting http://www.mongodb.org/display/DOCS/MapReduce#MapReduce-Parallelism As of right now, MapReduce jobs on a single mongod process are single threaded Without parallelism, what are the benefits of MapReduce compared to simpler or more traditional methods for queries and data aggregation? To avoid confusion: the question is NOT "what are the benefits of document-oriented DB over traditional relational DB"

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• DEBIAN repository signing: a step-by-step guide.

  - by jldupont

  I've got many DEBIAN repository for my projects (e.g. EPAPI, erlang-dbus etc.). It seems that now Synaptic wants those to be signed for the packages to appear by default. For the DEBIAN kung-fu masters out there, please provide me with a step-by-step guide to achieving this, please. I've googled a lot but I am still a bit confused on the subject. update: I use a Launchpad PPA now... saves me from all this trouble.

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• Would Apple be able to tell if I'm running Mac OS inside a VM?

  - by Thomas Havlik

  Just as the question/title says. I understand that running Mac OS inside of a VM is against the EULA for the consumer version (but not the server, which is much more expensive!) If I were to purchase a legal copy of Mac OS, and install it to a VM, then register as an Apple Developer, would they shut me out? Is there a way they can tell the difference between emulated hardware and Apple computers? I'm slightly unfamiliar with how all of Apple's software works. Windows goes through this "genuine" test whenever installing service packs, but I don't know if Mac goes through the same trouble. Many thanks, -Tom

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• How use a single project file in XCode (in several computers)

  - by mamcx

  I code in 2 differents computers with diferent username. XCode make a pbxuser file for each one, making necesary replicate the config from each one. This is error prone, and the files are not diff-friendly so everything must be carefully checked. Any way to avoid this?

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• Best network tuning variables for a Linux proxy

  - by smarthall

  What are the best settings to tune so that Linux can handle a very large amount of TCP connections such as would be seen by a proxy server or a webserver? I'm using Centos6 and squid and am seeing a large amount of TIME_WAIT connections backing up until finally the machine stops responding. The machine isn't loaded at the time, and is having trouble making ingoing and outgoing connections. I've had several suggestions of tuning /proc/sys/net/ipv4/tcp_tw_reuse and /proc/sys/net/ipv4/tcp_tw_reuse but they mention bad interactions with load balancers and NAT both of which are used in my situation.

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• how to dynamically break NHibernation cascade

  - by Joe Black

  The NHibernate cascade setting in the entity mapping is static. Is there anyway to dynamically disable the "cascade" setting in code to avoid expensive cascade operation in NHiberate during a bulky data transaction? We do not want to use stored procedures or native SQL because we need to have the entity changes captured by NHibernate (audit).

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• Which linux x86 hardware keystore?

  - by byeo

  I'm terminating SSL/TLS in my DMZ and I have to assume that machine will be hacked. At which point my certificates are compromised. Previously I've used nCipher hardware keystore/accelerator to solve this issue. These cards won't reveal the private key even to root. The card performs the encryption and decryption onboard and is hardened against physical attack. The only way to get at the keys is by attaching a smart card reader to the card itself. I'm having trouble finding information about something to recreate this approach. Is this the domain of specialist switches and firewalls these days? This old page references some of the old hardware: http://www.kegel.com/ssl/hw.html#cards

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• Recurring payment, receiving transaction_id

  - by Dmitry Velesnitsky

  What is the data paypal returns if we make recurring payments through a Subscription button on the website? How can we get transaction_id? It's that we want our users to pay with credit cards with no need to register, but so far we can't get transaction_id to get the information for automatic processes on the website directly. Instead we have to manage it all through paypal account. How can we avoid it?

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• Avoiding SQL Injection in SQL query with Like Operator using parameters?

  - by MikeJ

  Taking over some code from my predecessor and I found a query that uses the Like operator: SELECT * FROM suppliers WHERE supplier_name like '%'+name+%'; Trying to avoid SQL Injection problem and parameterize this but I am not quite sure how this would be accomplished. Any suggestions ? note, I need a solution for classic ADO.NET - I don't really have the go-ahead to switch this code over to something like LINQ.

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• scp to remote servers stalls, unable to isolate cause

  - by Rolf

  When I copy a large file (100+mb) to a remote server using scp it slows down from 2.7 mb/s to 100 kb/s and downward and then stalls. The problem is that I can't seem to isolate the problem. I've tried 2 different remote servers, using 2 local machines (1 osx, 1 windows/cygwin), using 2 different networks/isps and 2 different scp clients. All combinations give the problem except when I copy between the two remote servers (scp). Using wireshark I could not detect any traffic volume that would congest the network (although about 7 packets/sec with NBNS requests from the osx machine). What in the world could be going on? Given the combinations I've used there doesn't seem to be any overlap in the thing that could be causing the trouble.

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• Regular Expression - Match only 7 chars?

  - by Simon

  I'm trying to match a SEDOL (exactly 7 chars: 6 alpha-numeric chars followed by 1 numeric char) My regex ([A-Z 0-9]{6})[0-9]{1} matches correctly but strings greater than 7 chars that begin with a valid match also match (if you see what I mean :)). For example: B3KMJP4 matches correctly but so does: B3KMJP4x which shouldn't match. Can anyone show me how to avoid this?

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• Auto-connect Bluetooth headphones in Windows 7 64bit

  - by CptSkippy

  I have a pair of bluetooth headphones that I've successfully paired with my Windows 7 64bit machine and audio plays through them without a hitch. On the Device Stage under the properties of the headphones in troubleshooting it shows "last connected" as "currently connected" even if I power cycle the headphones or after a reboot of my computer. So the Windows bluetooth stack has no trouble finding them. The problem I have is that whenever the headphones reconnect to my pc they show up as disconnected in the Sound Settings and no sound is routed to them until I manually connect them. I have to go into Sound Settings, then from the Playback tab right click on the headphones and choose the Connect option. Is there a way to make the Sound Settings connect automatically whenever the headphones are available to Windows?

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• How can I load a property lazily in JDO (on Google App Engine)?

  - by luciano

  I have this code in one of my @PersistenceCapable classes: @Persistent private Blob data; The Blob can be quite big, so I'd like to load it lazily since most of the times I don't need it. How can I annotate that property to avoid immediate loading? I could create another class that contains the Blob alone and then use a lazy one-to-one, but I'd like to solve this with annotations.

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• Why is my wireless so slow compared to my wired download speed?

  - by Shawn

  I just used speedtest.net (using Firefox) to compare my wired connection speed with my wireless connection speed. With my current contract (with Videotron), I'm supposed to get Download speed: 8Mbps Upload speed: 1Mbps Here are the results of the speedtest.net test: Wired Ping: 14ms Download speed: 8.41Mbps Upload speed: 1.04Mbps Wireless Ping: 16ms Download speed: 0.18Mbps Upload speed: 0.98Mbps The difference in download speeds seems staggering to me since I did the test 1 meter aways from my router. Any clue as to why my wireless download speed is so low compared to my wired download speed? using Ubuntu 11.04 on an Acer Aspire 5536-5519 Oh and it might be worth mentioning that my girlfriend has no trouble at all with her wireless connection. No slowness at all. (She uses Firefox on Windows 7 on a Dell) Here's the results for the same test on her system: Ping: 22ms Download speed; 8.44Mbps Upload speed: 1.02Mbps

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• Opening Word documents from IE LAG Windows 7 IE8

  - by Steve McCall

  Hi, I'm having a lot of trouble opening documents from a network share in word using IE. The documents are located in a network share which is mapped to a virtual directory. The documents are accessed by URLs that link to the virtual directory. There is now a huge lag (sometimes up to a minute or two!) from when clicking on the link to the document opening in word. The 'loading disc' in IE just keeps spinning and nothing happens. Sometimes a pop up box appears with 'opening file - (address)' but it still takes ages. I've tried setting in the registry to open the files directly in ie but to no avail. Anyone have any ideas? Steve

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• Windows Server 2008 r2 FTP blocking outside connections

  - by nbon

  I have a windows server 2008r2 running IIS 7.5. I am trying to setup a FTP-server in IIS but I'm running into some annoying problems. Setting up the server works fine but when I try to connect from a remote client the connection times out. I have tried to connect to the FTP-server from the localhost and it works flawlessly. I figured that it should be some trouble with the firewall so I went into firewall settings and disabled the Public Profile and my remote connections worked! In my inbound rules there are rules for FTP-connections to allow all profiles etc. I guess they are made automatically when setting up the FTP-server. Anyone got any idea how to allow remote connections without turning off the public firewall?

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• Object of type "X" cannot be converted to object of type "X"

  - by Benjol

  (Can't believe this hasn't already been asked, but I can't find a dup) In Visual Studio with lots of projects, when I first open the solution, I sometimes get the warning Object of type "X" cannot be converted to object of type "X". Generally rebuilding seems to make it go away, but does anyone know what this is caused by, and how to avoid it? UPDATE I read somewhere that deleting all your resx files and rebuilding can help. I unthinkingly tried this. Not a good idea...

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• Deactivate SYN flooding mechanism

  - by mlaug

  I am running a server that is running a service on port 59380. There are more than 1000 machines out there connecting to that service. Once I need to restart the service all those machines are connecting at the same time. That made some trouble as I have seen that log entry in kern.log TCP: Possible SYN flooding on port 59380. *Sending cookies*. Check SNMP counters. So I changed sysctl net.ipv4.tcp_syncookies to 0 because the endpoints to not handle tcp syn cookies correctly. Finally I restarted my network to get the changes in production Next time I had to restart the service, the following message was logged TCP: Possible SYN flooding on port 59380. *Dropping request*. Check SNMP counters. How can I prevent the system for doing such actions? All necessary counter measures are done by iptables...

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• Why it's not possible to compile on a different OS than end-user OS [closed]

  - by sameold

  I was trying to compile a php extension on Windows and ran into some trouble. I then thought it was possible to do the compilation for Windows on Linux, but turned out that wasn't possible. Can someone explain to me why compiling has to be done on the same OS? I'm trying to understand this topic, specifically because if I want to distribute something, does that mean I have to compile it on all these OSs (Windows 7, Windows Vista, Windows XP, Linux, Mac, etc. etc. etc.) So what makes it not possible to compile for one OS on another? Is it the kernel or what?

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• make field a dropdown in access 2007

  - by Crash893

  I'm creating a HR database in access 2007 I have a main table of employee info and several tables that relate to that table ( education for example) that list the acceptable elements that can populate that cell in that row When i create a form it was created as just a plain text field which is constrained but I wanted to create a dropdown that had just the data that they are allowed to enter to avoid confusion.

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• Formatting a 5.25" floppy disk

  - by Spütnik

  So after the massive trouble of finding a 5.25" floppy drive and a connecting it up, then changing the BIOS so it's set as my A: drive, I tried to format a couple of high-density 1.2MB floppy disks using the "format A:" command in Command Prompt. Both times it formatted only 160KB and left it at that. If I then check the amount of space on those disks, it then comes up as 160KB. Why is this the case? How can I get my the full value out of my 1.2MB? For reference, I have a Mitsubishi MF504C-318UG, which should support 1.2MB disks.

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• is it possible to start coda slider on a hidden div?

  - by andufo

  i have a div id=holder, and inside a coda slider. it works alright, but to avoid the flickering in certain browsers, i decided to make holder display:none, and then display:block on $(document).ready The problem is that, for some reason, when the parent div is display:none, the coda slider doesnt have any effect. any workarounds or ideas for this issue? thanks!

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• Installing VMWare Tools in Windows Server 2008 fails system startup

  - by Hoghweed

  I recently created a vmware virtual machine with windows server 2008 enterprise as Guest. My host is Ubuntu 10.04 on my Lenovo laptop. I fall into a big trouble which makes my created VM unusable after I've installed VMWare Tools. After installing tools I'm able to run the system only in safe mode. After some event manager analysis I found the issue is with drivers installed by vnmware tools. Any one has got the same issue? Is there any good practice for doing that? The configuration of vm machine is the following CPU : 1 RAM : 1020 HD : 40GB Splitted files, SCSI CD : IDE Thanks in advance

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• Problem with skipping login validation for authlogic

  - by Andrei

  Hi, I want to use email for signing in, and to allow users to have similar names. One way to do this is to rename login/username field to something different. However, I want to do it just by setting up authlogic. I tried the following acts_as_authentic do |c| c.login_field :email c.validate_login_field false c.validate_email_field true end but it still complains that the login already exists. What must be done to avoid username validation without renaming the field?

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• How can I check for missing references in VB.NET?

  - by Tea With Cookies

  I need to check if all the references in a project exist to avoid possible errors but I can't find anywhere how to do it in VB.NET. I can do it in VBA like this: Dim vbProj As VBProject Dim chkRef As Reference Set vbProj = ThisWorkbook.VBProject For Each chkRef In vbProj.References If chkRef.IsBroken Then Debug.Print chkRef.Name " reference doesn't exist!" End If Next How do I accomplish this in VB.NET?

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