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• PostgreSQL disaster recovery options

  - by Alex

  My customer has quite a large (the total "data" folder size is 200G) PostgreSQL database and we are working on a disaster recovery plan. We have identified three different types of disasters so far: hardware outage, too much load and unintentional data loss due to erroneously executed bad migration (like DELETE or ALTER TABLE DROP COLUMN). First two types seem to be easy to mitigate but we can't elaborate a good mitigation plan for the third type. I proposed to use ZFS and frequent (hourly) snapshots but "ZFS" means "OpenIndiana" these days and our Ops engineers do not have much expertise in it, so using OpenIndiana imposes another risk. Colleagues try to convince me that restoring from PostgreSQL PITR backup can be as fast as restoring from a ZFS snapshot but I highly doubt that replaying, say, 50G of archived WALs can be considered "fast". What other options are we missing? Is ZFS an only viable alternative? Can we get a fast Pg DB restore time in the Linux environment?

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• How to forward AIM to Gmail

  - by iamjames

  Still have an old AIM email address lying around and would like to forward it to Gmail?  Here's how: 1.  Login to your AIM and click on Settings on the far right 2.  In the left menu click IMAP and POP  3.  This shows you your IMAP and POP setup information for AIM.  We're going to put this into your Gmail account so your Gmail account will check your AIM account and download all AIM emails. 4.  Login to your Gmail, click Settings and click Accounts and Import 5.  Click "Import mail and contacts".  A new window will pop up asking what account you want to import.  Enter your AIM Email Address and click Continue 6.  The next page asks for your password.  Enter your password and click Continue.  Step 2 asks your Import options.  I'd put a checkmark in "Leave a copy of retrieved message on server".  That way all your mail is still stored on AIM if you ever need it. 7.  Click Start import and you're done.  Next screen says it make take several hours up to 2 days before you start seeing imported messages and can check the status at Settings > Accounts and Import

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• Trackpad Drag lock pissing me off with Windows 7

  - by rockinthesixstring

  This is driving me insane and I've scowered the web for two days trying to fix this. I just picked up an Apple Magic Trackpad to be used exclusively on a Windows 7 PC (not apple with bootcamp). I found a nice driver that got it working right away, but when I'm moving the cursor around the screen, often it will begin "highlighting" text, or picking up and dragging things I don't want it to. I looked in the "regedit" where people are saying there is binary that can be changed, however the driver I installed doesn't use the binary being suggested. Can anyone suggest a better driver for my situation or a way to disable the drag lock that is driving me so nuts? I don't mind not being able to lift my finger when dragging, it's a far better compromise than having the insane feature.

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• How to batch rename files copied from OSX to Windows with ':' in filenames?

  - by tputkonen

  This is really puzzling. I have lots of videos that were stored using Mac OS, and now I have to edit them on Windows XP. I copied files using HFSExplorer. Editing software refuses to open the files with their current names, and so far I have not found a way to batch rename all the files. Names of the files look like this: clip-2009-10-01 21;26;00.mov But I suspect in OSX the time was 21:26:00. I would like to replace the space with an underscore, and semicolons with dash. I've tried several bulk rename applications, with ; and :, but in vain. Also I've tried rename.pl, but also in vain.

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• If i make a mail server can i send bulk email?

  - by Jake Smith

  I work for a small company and we have fallen into the fad of "email campains" a.k.a Junk mail. So far the company has gotten a subscriber list from our website, and paid a good chunk of change for a emailer program. The problem is, Our list has close to 4,000 people on it and growing. with gmail only allowing 100 emails per account through on SMTP and I am on a tight budget so I cant hire anyone else. I was thinking of doing a dedicated mail server off of the website server we have running in the office. Is it possible? to make emails on your own server, and then send it through your own SMTP? if it is, what software would I need and is if free or low cost at least. We run a WAMP server, i set it up just for information, but i could switch it to lamp or whatever if need be. Thank you for your time and youre answers

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• How long does it take to delete a Google Apps for Domain account and allow recreation?

  - by Wil

  Basically, I set up a Google Apps for domain account for one of my clients but upon trying to upload a CSV of users, only half were created and then I kept getting time outs, 404's and other errors which I never saw when setting up another client. I was not sure how, but thought I may have caused an error or there was an error Google Side when the account was created so I thought it may be best to delete the domain and start from scratch. Little did I know, you had to wait to recreate the domain! As far as I can tell from what I have read, there is five days to delete and allow recreation of similar user names, however, I can't see anything that shows how long you have to wait for the domain account. It has now been 5/6 days and I can't recreate it. The cancellation email I got shows "...If at any time you would like to sign-up for Google Apps for this or another domain, you can do so by visiting..." But it does not mention how long!!! I tried emailing Google directly but got no response. Does anyone know?

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• What is an effective way to convert a shared memory-mapped system to another data access model?

  - by Rob Jones

  I have a code base that is designed around shared memory. Each process that needs to access the memory maps it into its own address space. The data structures in the shared memory are directly accessed, that is, there is no API. For example: Assume the following: typedef struct { int x; int y; struct { int a; int b; } z; } myStruct; myStruct s; Then a process might access this structure as: myStruct *s = mapGlobalMem(); And use it as: int tmpX = s->x; The majority of the information in the global structure is configuration information that is set once and read many times. I would like to store this information in a database and develop an API to access the database. The problem is, these references are sprinkled throughout the code. I need a way to parse the code and identify global structure references that will need to be refactored. I've looked into using ANTLR to create a parser that will identify references to a small set of structures and enter them into a custom symbol table. I could then use this symbol table to identify which source files need to be refactored. It looks like a promising approach. What other approaches are there? Of course, I'm looking for a programmatic approach. There are far too many source files to examine each one visually. This is all ordinary ANSI C. Nothing else.

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• Three apps going through apache. How to configure apache httpd?

  - by Chris F.

  I have a quick question but I've been struggling to find the best solution: I have two java webapps and wordpress (php) that I need to serve through my Prod website: App #1 should be accessed when pointing to www.example.com/ (this would have other url too such as "www.example.com/book") App #2 should be accessed when pointing to www.example.com/manage Finally WordPress would be accessed at www.example.com/info How can I configure apache to serve all these three instances at the same time? So far I have and it's not quite working right. Any suggestions would be much appreciated! Listen 8081 <VirtualHost *:8081> DocumentRoot /var/www/html </VirtualHost> ProxyPass /manage http://127.0.0.1:8080/manage ProxyPassReverse /manage http://127.0.0.1:8080/manage ProxyPass /info http://127.0.0.1:8081/info ProxyPassReverse /info http://127.0.0.1:8081/info ProxyPass / http://127.0.0.1:9000/ ProxyPassReverse / http://127.0.0.1:9000/

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• Moving objects colliding when using unalligned collision avoidance (steering)

  - by James Bedford

  I'm having trouble with unaligned collision avoidance for what I think is a rare case. I have set two objects to move towards each other but with a slight offset, so one of the objects is moving slightly upwards, and one of the objects is moving slightly downwards. In my unaligned collision avoidance steering algorithm I'm finding the points on the object's forward line and the other object's forward line where these two lines are the closest. If these closest points are within a collision avoidance distance, and if the distance between them is smaller than the two radii of the two object's bounding spheres, then the objects should steer away in the appropriate direction. The problem is that for my case, the closest points on the lines are calculated to be really far away from the actual collision point. This is because the two forward lines for each object are moving away from each other as the objects pass. The problem is that because of this, no steering takes place, and the two objects partially collide. Does anyone have any suggestions as to how I can correctly calculate the point of collision? Perhaps by somehow taking into account the size of the two objects?

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• What kind of language will replace C++ as C++ replaced C ? [closed]

  - by jokoon

  I think I'm not totally wrong when thinking that C++0x (or C++1x) is still C++, just better, with functionnalities coming from boost. I can't stop thinking that computer sciences, even with all that has been made so far, have to evolve again. I don't really like D since it just try to be some sort of "what C++ should have been", and Go seems to be too sophisticated when I dig a little into it, especially after watching some presentation video like this one http://www.youtube.com/watch?v=rKnDgT73v8s The first thing that come into my mind is a new kind of syntax to directly handle specific datatypes and containers such as map, vectors, queues... What kind of things are researchers thinking about ? What are the real features that could make C++ better or a new C-like language could invent ? Does Go features such things ? Would there be a new kind of syntax that would "unbloat" C++ while keeping its advantages ? Could C++ have some of the interesting stuff of languages such as C# and ObjC ? EDIT: Please consider that I'm talking about a system language, not a VM/CLI/bytecode thing.

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• Varnish doesn't seem to be caching

  - by Charlie Somerville

  I've setup a Varnish cache mirror to sit in front of a file server, but it seems to be endlessly re-downloading data from my file server. There's about 100GB of data in total, but so far Varnish has downloaded 800GB from my file server. I'm using the default VCL file that comes with Varnish and the response headers for files served by the file server are similar to the following: HTTP/1.1 200 OK Cache-Control: max-age=290304000, public Content-Type: image/jpeg Expires: Wed, 29 Dec 2010 21:38:33 GMT Server: Microsoft-IIS/7.0 E-Tag: "8b4723296ab697530768f18b1378b269" Content-Disposition: inline; filename=image046.jpg; X-AspNet-Version: 4.0.30319 X-Powered-By: ASP.NET Date: Thu, 23 Dec 2010 05:38:33 GMT Content-Length: 100592 I'm starting varnishd with the following options: varnish/sbin/varnishd -a 0.0.0.0:80 -f varnish/etc/varnish/default.vcl -s file,varnish/var/lib/varnish/varnish_storage.bin,100G

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• Simulating network latency for localhost connection on Windows 7

  - by nitro2k01

  I need to simulate network latency to a program running on the local computer, connecting to a local service. Thus far I have tried dummynet (a windows build of ipfw) which I got working after some trial and error. While it generally works, I can't seem to get it to filter localhost traffic. Even after adding a rule from any to any which affects external traffic, this makes no difference for local connections. I would appreciate if anyone knows how to simulate local latency using dummynet or a different tool. The tool should be able to simulate latency generically in IP packets, (TCP and UDP) and not be protocol specific.

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• Genetic Algorithm new generation exponentially increasing

  - by Rdz

  I'm programming Genetic Algorithm in C++ and after searching all kind of ways of doing GA'a operators (selection, crossover, mutation) I came up with a doubt. Let's say I have an initial population of 500. My selection will consist in getting the top 20% of 500(based on best fitness). So I get 100 individuals to mate. When I do the crossover I'll get 2 children where both together have 50% of surviving. So far so good. I start the mutation, and everything's ok.. Now when I start choosing the Next generation, I see that I have a big number of children (in this case, 4950 if you wanna know). Now the thing is, every time I run GA, if I send all the children to the next generation, the number of individuals per generation will increase exponentially. So there must be a way of choosing the children to fulfill a new generation without getting out of this range of the initial population. What I'm asking here is if there is anyway of choosing the children to fill the new generations OR should I choose somehow (and maybe reduce) the parents to mate so I don't get so many children in the end. Thanks :)

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• sql server log shipping

  - by voam

  I am setting up log shipping with two 2008 sql servers connecting with a vpn. As far as I know as long as the sql agent is able to access the share on the primary/secondary servers everything will work. When I set up the Log shipping on the primary server using SQL Mangagement Studio, before I can set any of the "Secondary Database Settings" it asks me to connect to the secondary server. But I really don't want to open up the connection to the secondary server. I will be initialing this secondary database with a backup so as long as the transaction logs get copies everything should work. How to I work around the GUI not enabling any of the settings for the secondary server until I actually connect to it? Thanks in advance!

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• Algorithmic problem - quickly finding all #'s where value %x is some given value

  - by Steve B.

  Problem I'm trying to solve, apologies in advance for the length: Given a large number of stored records, each with a unique (String) field S. I'd like to be able to find through an indexed query all records where Hash(S) % N == K for any arbitrary N, K (e.g. given a million strings, find all strings where HashCode(s) % 17 = 5. Is there some way of memoizing this so that we can quickly answer any question of this form without doing the % on every value? The motivation for this is a system of N distributed nodes, where each record has to be assigned to at least one node. The nodes are numbered 0 - (K-1) , and each node has to load up all of the records that match it's number: If we have 3 nodes Node 0 loads all records where Hash % 3 ==0 Node 1 loads all records where Hash % 3 ==1 Node 2 loads all records where Hash % 3 ==2 adding a 4th node, obviously all the assignments have to be recomputed - Node 0 loads all records where Hash % 4 ==0 ... etc I'd like to easily find these records through an indexed query without having to compute the mod individually. The best I've been able to come up with so far: If we take the prime factors of N (p1 * p2 * ... ) if N % M == I then p % M == I % p for all of N's prime factors e.g. 10 nodes : N % 10 == 6 then N % 2 = 0 == 6 %2 N % 5 = 1 == 6 %5 so storing an array of the "%" of N for the first "reasonable" number of primes for my data set should be helpful. For example in the above example we store the hash and the primes HASH PRIMES (array of %2, %3, %5, %7, ... ]) 16 [0 1 1 2 .. ] so looking for N%10 == 6 is equivalent to looking for all values where array[1]==1 and array[2] == 1. However, this breaks at the first prime larger than the highest number I'm storing in the factor table. Is there a better way?

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• MAMP PHP5.3 and 5.4

  - by musoNic80

  I've just downloaded the latest version of MAMP (2.1) but have run into a few issues. I'm developing using Symfony2 which requires php5.3 minimum. It also requires a php accelerator, ideally APC. So, I set MAMP (I'm not using MAMP PRO) to use php 5.4. Problem solved, I thought. Apparently not though. It turns out MAMP have decided not to support APC (or any accelerator as far as I can see) with their 5.4 version apparently due to it being buggy (really?!?!). Ok, so I'll just use 5.3 instead. Apparently not. It turns out that although MAMP has installed 5.3 on my machine I can't select it in the preference pane. I get a choice of 5.2 or 5.4! Is there a workaround for this?

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• Usual Suspects: Typical 3rd Party Entities in E-Commerce [closed]

  - by zharvey

  I am doing some requirements/analysis for a web app that I'd like to build (Ruby/Java developer here). This web app would have a store front, shopping cart and would need to be totally compliant with all e-com best practices. It's amazing how much non-technical info comes up when you search for phrases like "how does e-commerce work", but very little comes up in the way of technical details. As such, I'm having extreme frustration finding answers to what I consider pretty straight-forward questions. I came here because I believe this question is not off-topic; if it is, please leave a comment as to why this question does not belong here and I will happily remove it myself (upvotes if your comment can point me to the correct place for this question!). So then: What 3rd parties will I need to work with to have a modern, web-compliant e-com site? So far I can account for a payment gateway provider like Authorize.net and an SSL certificate provider like Trustwave. Any others? What other standards besides PCI compliance will I be held to (besides governing laws, of course!)? Vulnerability scans: PCI compliance requires quarterly scans: if I'm a "Level 4" (low volume) Merchant does that still apply to me? Irregardless, my backend architecture is quite huge, with web servers, app servers, database, message brokers and more. Do each of these servers need to be scanned?!? If not what servers do need to get these quarterly scans? I usually hate to ask micro-questions inside of one large one, but these are so closely-related I just felt like asking them all separately would be spamming the site with too many petty questions. Thanks in advance!

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• Protocol Security With PPTP

  - by why

  I find these words in pptp client source : Summary by Peter Mueller PPTP is known to be a faulty protocol. The designers of the protocol, Microsoft, recommend not to use it due to the inherent risks. Lots of people use PPTP anyway due to ease of use, but that doesn't mean it is any less hazardous. The maintainers of PPTP Client and Poptop recommend using OpenVPN (SSL based) or IPSec instead. (Posted on [1]2005-08-10 to the [2]mailing list) But as far as i know, there are many people use PPTP as a VPN, because there is no need to install client on windows, what do you think about pptp ?

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• How can I stop a process from moving to the background?

  - by Alex

  I have a machine running Ubuntu server version 12.04.3 LTS. On it, I'm attempting to run a node.js server that needs to stay up and running at all times. I'm running into an issue, however, where periodically I see this happen: [1]+ Stopped sudo node server.js When this happens, I have to manually bring it back with fg, which works fine, at least until it stops again. As far as I can tell, it isn't functioning properly while stopped, since I get no log files in those windows of time. So my question is this: Is there a way to prevent it from being stopped like that? I'm running it in a tmux window, if that changes anything. Also, to address the question before it gets asked: I'm running it as sudo due to some ecryptfs issues I've been having. I was originally running it in my home directory, but when it was left alive for too long things would get out of sync and the file writes it has to do would just stop working. To mitigate that, I moved it out of my home directory, but its new location requires me to use sudo permissions for everything to work correctly. Hopefully that isn't related to the whole background task thing. (sudo and tmux tags included in case one or both turn out to actually be relevant to the solution.)

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• Programming languages with a Lisp-like syntax extension mechanism

  - by Giorgio

  I have only a limited knowledge of Lisp (trying to learn a bit in my free time) but as far as I understand Lisp macros allow to introduce new language constructs and syntax by describing them in Lisp itself. This means that a new construct can be added as a library, without changing the Lisp compiler / interpreter. This approach is very different from that of other programming languages. E.g., if I wanted to extend Pascal with a new kind of loop or some particular idiom I would have to extend the syntax and semantics of the language and then implement that new feature in the compiler. Are there other programming languages outside the Lisp family (i.e. apart from Common Lisp, Scheme, Clojure (?), Racket (?), etc) that offer a similar possibility to extend the language within the language itself? EDIT Please, avoid extended discussion and be specific in your answers. Instead of a long list of programming languages that can be extended in some way or another, I would like to understand from a conceptual point of view what is specific to Lisp macros as an extension mechanism, and which non-Lisp programming languages offer some concept that is close to them.

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• OpenGL + Allegro. Moving from software drawing X Y to openGL is confusing

  - by Aaron

  Having a fair bit of trouble. I'm used to Allegro and drawing sprites on a bitmap buffer at X Y coords. Now I've started a test project with OpenGL and its weird. Basically, as far as I know, theirs many ways to draw stuff in OpenGL. At the moment, I think I'm creating a Quad? Whatever that is, and I think Ive given it a texture of a bitmap and them im drawing that: GLuint gl_image; bitmap = load_bitmap("cat.bmp", NULL); gl_image = allegro_gl_make_texture_ex(AGL_TEXTURE_MASKED, bitmap, GL_RGBA); glBindTexture(GL_TEXTURE_2D, gl_image); glBegin(GL_QUADS); glColor4ub(255, 255, 255, 255); glTexCoord2f(0, 0); glVertex3f(-0.5, 0.5, 0); glTexCoord2f(1, 0); glVertex3f(0.5, 0.5, 0); glTexCoord2f(1, 1); glVertex3f(0.5, -0.5, 0); glTexCoord2f(0, 1); glVertex3f(-0.5, -0.5, 0); glEnd(); So yeah. So I got a few questions: Is this the best way of drawing a sprite? Is it suitable? The big question: Can anyone help / Does anyone know any tutorials on this weird coordinate thing? If it even is that. It's vastly different from XY, but I want to learn it. I was thinking maybe I could learn how this weird positioning stuff works, and then write a function to try and translate it to X and Y coords. Thats about it. I'm still trying to figure it all out on my own but any contributions you guys can make would be greatly appreciated =D Thanks!

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• Is it possible to make Ctrl+C as responsive as Ctrl+Break in the Windows 7 console?

  - by Peter Graham

  Is it possible to make Ctrl+C act like Ctrl+Break in the Windows 7 cmd.exe console? By default Ctrl+C seems to only send a signal the next time the input buffer is read, where Ctrl+Break sends a signal immediately. This makes Ctrl+C useless for ending processes because when I want to end a process I want to end it immediately. I'm using Ctrl+Break for now but it's far harder to type. It looks like in DOS you can add BREAK=ON to CONFIG.SYS to achieve this, but not in Windows 7?

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• How to tell if OpenGL is really working in Ubuntu 10.04

  - by Jonathan

  I have a lenovo S9e running Intel integrated graphics. Here is my lspci output related to the graphics: 00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML Express Integrated Graphics Controller (rev 03) Subsystem: Lenovo Device 3870 Flags: bus master, fast devsel, latency 0 Memory at f0580000 (32-bit, non-prefetchable) [size=512K] Capabilities: [d0] Power Management version 2 I want to know how I can make sure OpenGL support is running in full on an Ubuntu 10.04 installation. I have a few hints to think that it is not: The "Desktop Effects" will not load Apps such as stardock, when attempting to use OpenGL rendering, will display black boxes instead of transparency In the games Pioneers, the number-tile icons are suspiciously just black circles Windows games running with Wine will only support software rendering, not hardware rendering When I boot into a Knoppix LiveCD, the desktop effects do work, splendidly, meaning compiz detects my computer as capable. My problem with troubleshooting is that Canonical has basically eliminated the conf-file-based mechanism of X11 as far as I can tell, thus making it even harder to ensure graphics modules are loading properly. How do I debug and test OpenGL on m Ubuntu 10.04 installation?

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• Windows 8 App Downloads Increasing + Over 5,000 Apps Available

  - by David Paquette

  Windows 8 will be unleashed on the general public tomorrow and I thought it would be a good time to review some of the numbers I have been tracking over the last month. Downloads of Windows 8 Apps have been steadily increasing over the last month.  Below is screenshot from the App Summary page for my Windows 8 app.  The blue line is my app, while the orange line is average for the top 5 apps in that subcategory.  Considering the large gap between the 2, I think it is safe to assume that my app is NOT in the top 5 in the subcategory. The spike in the last couple of days is fairly dramatic and I am a little surprised by that.  I would have expected that kind of spike on the days following the official release as opposed to the days leading up to the release.   Finally, the all important App count.  There have been some stories floating around that the Window 8 Store is a ghost town and that there are no apps available.  I think these might be exaggerating the situation a little.  As of this morning, in the US store there are over 5000 apps available for download.  Obviously a far cry from the hundreds of thousands available in other app stores, but we are seeing solid growth in this number. Less than a month ago, that number was 2000. That means the store more than doubled in less than a month. If the growth continues, it won’t be long before the Widows 8 Store is filled with all the apps you need (and a whole lot you don’t need).

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• Customer Experience in the Year Ahead

  - by Christina McKeon

  With 2012 coming to an end soon, we find ourselves reflecting on the year behind us and the year ahead. Now is a good time for reflection on your customer experience initiatives to see how far you have come and where you need to go. Looking back on your customer experience efforts this year, were you able to accomplish the following? Customer journey mapping Align processes across the entire customer lifecyle (buying and owning) Connect all functional areas to the same customer data Deliver consistent and personal experiences across all customer touchpoints Make it easy and rewarding to be your customer Hire and develop talent that drives better customer experiences Tie key performance indicators (KPIs) to each of your customer experience objectives This is by no means a complete checklist for your customer experience strategy, but it does help you determine if you have moved in the right direction for delivering great customer experiences. If you are just getting started with customer experience planning or were not able to get to everything on your list this year, consider focusing on customer journey mapping in 2013. This exercise really helps your organization put your customer in the center and understand how everything you do affects that customer. At Oracle, we see organizations in various stages of customer experience maturity all learn a lot when they go through journey mapping. Companies just starting out with customer experience get a complete understanding of what it is like to be a customer and how everything they do affects that customer. And, organizations that are further along with customer experience often find journey mapping helps provide perspective when re-visiting their customer experience strategy. Happy holidays and best wishes for delivering great customer journeys in 2013!

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