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• Creating an expandable, cross-platform compatible program "core".

  - by Thomas Clayson

  Hi there. Basically the brief is relatively simple. We need to create a program core. An engine that will power all sorts of programs with a large number of distinct potential applications and deployments. The core will be an analytics and algorithmic processor which will essentially take user-specific input and output scenarios based on the information it gets, whilst recording this information for reporting. It needs to be cross platform compatible. Something that can have platform specific layers put on top which can interface with the core. It also needs to be able to be expandable, for instance, modular with developers being able to write "add-ons" or "extensions" which can alter the function of the end program and can use the core to its full extent. (For instance, a good example of what I'm looking to create is a browser. It has its main core, the web-kit engine, for instance, and then on top of this is has a platform-specific GUI and can also have add-ons and extensions which can change the behavior of the program.) Our problem is that the extensions need to interface directly with the main core and expand/alter that functionality rather than the platform specific "layer". So, given that I have no experience in this whatsoever (I have a PHP background and recently objective-c), where should I start, and is there any knowledge/wisdom you can impart on me please? Thanks for all the help and advice you can give me. :) If you need any more explanation just ask. At the moment its in the very early stages of development, so we're just researching all possible routes of development. Thanks a lot

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• VMWare esxi 4.1 storage errors with MD3200

  - by Karl Katzke

  We're seeing some storage errors from the esxi logs relating to our MD3200. I'm sort of a VMWare noob and am not sure where to go from here because I couldn't find a lot of documentation on the VMWare website, and the forums didn't seem to have any posts about it with actual answers. Everything is working, but I'm trying to proactively troubleshoot this. sfcb-vmware_base|StoragePool Cannot get logical disk data from controller 0 sfcb-vmware_base|Volume Cannot get logical disk data from controller 0 sfcb-vmware_base|storelib-GetLDList-ProcessLibCommandCall failed; rval = 0x800E The ESXi boxes are connected directly via SAS to the controller on the MD3200. What do these errors actually mean, and what's a good path to start troubleshooting or solving them?

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• Would it be a good idea to work on letting people add arrays of numbers in javascript?

  - by OneThreeSeven

  I am a very mathematically oriented programmer, and I happen to be doing a lot of java script these days. I am really disappointed in the math aspects of javascript: the Math object is almost a joke because it has so few methods you can't use ^ for exponentiation the + operator is very limited, you cant add array's of numbers or do scalar multiplication on arrays Now I have written some pretty basic extensions to the Math object and have considered writing a library of advanced Math features, amazingly there doesn't seem to be any sort of standard library already out even for calculus, although there is one for vectors and matricies I was able find. The notation for working with vectors and matricies is really bad when you can't use the + operator on arrays, and you cant do scalar multiplication. For example, here is a hideous expression for subtracting two vectors, A - B: Math.vectorAddition(A,Math.scalarMultiplication(-1,B)); I have been looking for some kind of open-source project to contribute to for awhile, and even though my C++ is a bit rusty I would very much like to get into the code for V8 engine and extend the + operator to work on arrays, to get scalar multiplication to work, and possibly to get the ^ operator to work for exponentiation. These things would greatly enhance the utility of any mathematical javascript framework. I really don't know how to get involved in something like the V8 engine other than download the code and start working on it. Of course I'm afraid that since V8 is chrome specific, that without browser cross-compatibility a fundamental change of this type is likely to be rejected for V8. I was hoping someone could either tell me why this is a bad idea, or else give me some pointers about how to proceed at this point to get some kind of approval to add these features. Thanks!

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• Game Resource Generation

  - by Darthg8r

  I am currently building a game that has a "City" entity. These cities generate and consume resources such as food variably over a period of time. I need to be able query the server often to find exactly how much food the city at any given point. These queries can take place multiple times per minute. There could also be 400,000 cities to track at a given time. How would you handle tracking these resources? Would you do it in real time, keeping an instance of the city in memory on the server, with some sort of a snapshot in time of the resources, then computing the growth/consumption from that snapshot time for subsequent queries? Would you work exclusively with a database, using a similar "snapshoting" scheme? Maybe a mixture of the 2, caching recently queried cities in memory for a period of time? There is also a lot of other data that each city needs to track. A player can queue units to build in a barrack. The armies available in the city will need to be updated as units complete. I'm interested in everyone's input on where/when/how you'd manage the real time data.

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• Finding a way to simplify complex queries on legacy application

  - by glenatron

  I am working with an existing application built on Rails 3.1/MySql with much of the work taking place in a JavaScript interface, although the actual platforms are not tremendously relevant here, except in that they give context. The application is powerful, handles a reasonable amount of data and works well. As the number of customers using it and the complexity of the projects they create increases, however, we are starting to run into a few performance problems. As far as I can tell, the source of these problems is that the data represents a tree and it is very hard for ActiveRecord to deterministically know what data it should be retrieving. My model has many relationships like this: Project has_many Nodes has_many GlobalConditions Node has_one Parent has_many Nodes has_many WeightingFactors through NodeFactors has_many Tags through NodeTags GlobalCondition has_many Nodes ( referenced by Id, rather than replicating tree ) WeightingFactor has_many Nodes through NodeFactors Tag has_many Nodes through NodeTags The whole system has something in the region of thirty types which optionally hang off one or many nodes in the tree. My question is: What can I do to retrieve and construct this data faster? Having worked a lot with .Net, if I was in a similar situation there, I would look at building up a Stored Procedure to pull everything out of the database in one go but I would prefer to keep my logic in the application and from what I can tell it would be hard to take the queried data and build ActiveRecord objects from it without losing their integrity, which would cause more problems than it solves. It has also occurred to me that I could bunch the data up and send some of it across asynchronously, which would not improve performance but would improve the user perception of performance. However if sections of the data appeared after page load that could also be quite confusing. I am wondering whether it would be a useful strategy to make everything aware of it's parent project, so that one could pull all the records for that project and then build up the relationships later, but given the ubiquity of complex trees in day to day programming life I wouldn't be surprised if there were some better design patterns or standard approaches to this type of situation that I am not well versed in.

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• Devoxx 2011 Started Today

  - by Yolande

  Devoxx 2011, organized by Java user group in Belgium, is the biggest Java conference in Europe. The first two University Days set the tone for the weeklong conference with its in-depth technical sessions lead by luminaries from the Java community and industry experts. Each day is a great mix of 3 hour sessions and hands-on labs, 30 minute Tools-in-Action sessions giving tips for faster and better application development and the traditional Birds-of-a-Feather sessions in the evening. Java sessions for today and tomorrow: - Next Gen Enterprise Apps - Bert Ertman and Paul Bakker talked about new Java EE 6 APIs that reduces the need for boilerplate code and configuration. - JavaFX 2.0 – A Java developer’s guide - Stephen Chin and Peter Pilgrim will give an overview of new version and how Java developers can take advantage of it - Java Rich Clients with JavaFX 2.0 - Richard Bair and Jasper Potts will get into JavaFX 2.0 APIs - Building an end-to-end application using Java EE 6 and NetBeans - Arun Gupta will showcase how to write Java EE 6 applications more effectively. - The OpenJDK Community BOF with Dalibor Topic Starting Tuesday, come by the Oracle booth to chat about technology, enter our raffle and have a beer every day at 18:45 The sessions will be available on Parleys website after the conference. In the meantime, you can learn a lot about those Java technologies on our website: - JavaFX 2.0 tutorials and documentation - OpenJDK - News from the GlassFish community - JavaEE 6 resources - JavaOne sessions

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• Stuck With grub rescue> console

  - by rej santos

  Here is the background of my issue: I just recently installed the latest version of Ubuntu along side with Windows 8 Enterprise. However upon checking the disk size, it seems that some of the portions of the hd memory were gone so I decided to check the disk partition and have seen that is was being used by another file system. Thinking that the Ubuntu takes it boots stuff from my drive C: , I deleted that partition and formated so I can use it to store some movies, music etc. Now, as I switch on my machine, I am stucked with: error: unknown filesystem grub rescue> I googled a lot and saw the following command which seems no to me like sudo, chainloader etc, all of these command only returns unknown command in the console. What I just wanted is to boot from my Windows 8 OS. Just to add, I can't open the BIOS menu so I could choose what media to boot. As I open my machine it automatically takes me to grub rescue console. Here are the thing I already have: Ubuntu Installation Disk Windows 8 System repair Disk I just don't know how to boot into these things. Let me know what to do.

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• Architectural and Design Challenges with SOA

  With all of the hype about service oriented architecture (SOA) primarily through the use of web services, not much has been said about potential issues of using SOA in the design of an application. I am personally a fan of SOA, but it is not the solution for every application. Proper evaluation should be done on all requirements and use cases prior to deciding to go down the SOA road. It is important to consider how your application/service will handle the following perils as it executes. Example Challenges of SOA Network Connectivity Issues Handling Connectivity Issues Longer Processing/Transaction Times How many of us have had issues visiting our favorite web sites from time to time? The same issue will occur when using service based architecture especially if it is implemented using web services. Forcing applications to access services via a network connection introduces a lot of new failure points to the application. Potential failure points include: DNS issues, network hardware issues, remote server issues, and the lack of physical network connections. When network connectivity issues do occur, how are the service clients are implemented is very important. Should the client wait and poll the service until it is accessible again? If so what is the maximum wait time or number of attempts it should retry. Due to the fact of services being distributed across a network automatically increase the responsiveness of client applications due to the fact that processing time must now also include time to send and receive messages from called services. This could add nanoseconds to minutes per each request based on network load and server usage of the service provider. If speed highly desirable quality attribute then I would consider creating components that are hosted where the client application is located. References: Rader, Dave. (2002). Overcoming Web Services Challenges with Smart Design: http://soa.sys-con.com/node/39458

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• amazon aws, rds

  - by b0x0rz

  just need a quick info on two questions but very related. 1 if we use rds on amazon aws, what happens if some of the machines rds is running on crash? i mean what happens with the data? is it gone? 2 if we use rds on amazon aws via beanstalk, and decide to stop them is the database gone, i mean data, is it gone? thnx a lot, simple yes/no will do, but if you can give more info or a solution to mitigate these issues if any of the answers is unfavorable, that would be great.

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• Game editor integration with the engine?

  - by Daniel

  What I am trying to figure out is what is the best way to integrate the editor(level, effects, model, etc...) in the most effective way? Now the first thing I thought would be to create the game engine(*) extremely modular. For example I took the example of game states. You could have multiple game states that all have their own update() and draw() methods among others. Each game state class would inherit from a base GameState class. This allows for a more modular approach and a useful one at that. Now would the most efficient approach be to implement the editor along with the modular engine, or create two different designs for both the game, and editor? I thought to take the game state example and extend it to window states, and well could be used for a lot more systems. Is there a better implementation of this design(game state) for use in other systems used in the engine? *: Now I know the term game engine is sorta irrelevant, and misused in many situations. What I am referring to as the "game engine" is the combination of the systems that the game must interact with for short. Also this is more of a theory / design question than an implementation. Even though both mix, i'd rather like to have a more general idea on how the editor is built in an efficient way and still using the same engine code as what the game uses. Thanks, Daniel P.S If you need more clarification or extra bits just leave a comment.

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• How to select all labeled messages in Gmail inbox?

  - by Tony

  I have dozens of labels and sub-labels and dozens of filters. I use the 'skip inbox' on a lot of filters but have many more that I want to see in the inbox before I archive them. It's easy to shift-select a few dozen at a time to archive when they are NOT separated by non-labeled mail. What I want to do is to be able to select all mail that has any label in the inbox and archive it with one click so that nothing but unlabeled mail is left in the inbox. This doesn't seem to be any different than what the Select Starred search except I can't find a wildcard search operator for labels.

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• Ctrl key is broken on HP Envy is broken, where can I find a replacement

  - by NewProger

  I work as a developer so I have to use key combinations a lot. And I have HP Envy laptop. And the Ctrl key is broken for the second time. First time I just took one from my friend. But I don't have any more friends who are willing to sacrifice their Ctrl key Anyone know where I can find one? (or rather a bunch because they are so weak and low quality) I tried to contact HP support but they did everything to prevent people from doing it. And it is impossible to reach HP support. And in my case where warranty is expired it is not possible at all according to their rules. Also I tried Googling but found nothing

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• More Tables or More Databases?

  - by BuckWoody

  I got an e-mail from someone that has an interesting situation. He has 15,000 customers, and he asks if he should have a database for their data per customer. Without a LOT more data it’s impossible to say, of course, but there are some general concepts to keep in mind. Whenever you’re segmenting data, it’s all about boundary choices. You have not only boundaries around how big the data will get, but things like how many objects (tables, stored procedures and so on) that will be involved, if there are any cross-sections of data (do they share location or product information) and – very important – what are the security requirements? From the answer to these types of questions, you now have the choice of making multiple tables in a single database, or using multiple databases. A database carries some overhead – it needs a certain amount of memory for locking and so on. But it has a very clean boundary – everything from objects to security can be kept apart. Having multiple users in the same database is possible as well, using things like a Schema. But keeping 15,000 schemas can be challenging as well. My recommendation in complex situations like this is similar to a post on decisions that I did earlier – I lay out the choices on a spreadsheet in rows, and then my requirements at the top in the columns. I  give each choice a number based on how well it meets each requirement. At the end, the highest number wins. And many times it’s a mix – perhaps this person could segment customers into larger regions or districts or products, in a database. Within that database might be multiple schemas for the customers. Of course, he needs to query across all customers, that becomes another requirement. Share this post: email it! | bookmark it! | digg it! | reddit! | kick it! | live it!

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• Oracle Developer Day, Romania, 2012

  - by Geertjan

  I'm on the way back from a great experience in Cluj, Romania: the Oracle Developer Day that was held here today. After the Oracle Developer Day in Warsaw, two days ago, I flew to Bucharest and then had to wait about 6 hours for the flight to Cluj. So I spent several of those hours in a taxi, with a very nice driver who showed me all over the place in Bucharest, such as the Palace of Parliament (according to Wikipedia, "the world's largest civilian building, most expensive administrative building, and heaviest building"): He also taught me a lot of Romanian. (My current phonetic-based vocabulary can be admired and/or ridiculed here.) Meeting Emilian Bold (third on the right below) from the NetBeans Dream Team was a definite highlight: The above shows the three speakers on the Java Track "preparing" for their sessions; me, Lukas Jungmann, and Emilian Bold. In Oracle's Gregor Rayman's keynote, this particular slide responded well to my NetBeans heart: The "Java Track" had sessions on Java EE 6, the NetBeans Platform, and Java Web Services, as well as "What's New in NetBeans IDE 7.1", where Emilian, shown in action below, outlined the NetBeans community, e.g., the NetBeans Dream Team and the NetBeans governance board. (But it was all in Romanian so I'm not really sure what was said exactly!) Finally, there was time to recover from the whole day, right before my trip back to Bucharest: All in all a great day! Looking forward to remaining in touch with the many people I met today.

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• Need Help with fixing permissions in mounted Drive

  - by Master

  I am trying a lot still my problem is not solved. I have a partion called Server and inside it i have 5 folders like Folder 1 FOlder 2 Folder 3 I am mounting the drive on startup by using following command as told to me by some senoir members and it works but with some problems /dev/sdb1 /media/Server ntfs defaults,umask=006,fmask=000,dmask=007,uid=1000,gid=1001 0 0 The problem is with this command the permission are applied to all folders like Folder 1 , Folder 2 , FOlder3 But i want that only FOlder 3 should be publicly readable and writable while all other should be private and no one should have access to that. How can i achieve that

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• can't access SAMBA shares on UBUNTU-server from other computers

  - by larand

  Installed UBUNTU-server 12.04 and configured /etc/samba/smb.conf as: #======================= Global Settings ======================= [global] workgroup = HEMMA server string = %h server (Samba, Ubuntu) security = user wins support = yes dns proxy = no log file = /var/log/samba/log.%m max log size = 1000 syslog = 0 panic action = /usr/share/samba/panic-action %d encrypt passwords = no passdb backend = tdbsam obey pam restrictions = yes unix password sync = yes passwd program = /usr/bin/passwd %u passwd chat = *Enter\snew\s*\spassword:* %n\n *Retype\snew\s*\spassword:* %n\n *password\supdated\ssuccessfully* . pam password change = yes map to guest = bad user ############ Misc ############ usershare allow guests = yes #======================= Share Definitions ======================= [printers] comment = All Printers browseable = no path = /var/spool/samba printable = yes guest ok = no read only = yes create mask = 0700 # Windows clients look for this share name as a source of downloadable # printer drivers [print$] comment = Printer Drivers path = /var/lib/samba/printers browseable = yes read only = yes guest ok = no [Bilder original] comment = Original bilder path = /mnt/bilder/org browseable = yes read only = no guest ok = no create mask = 0755 [Bilder publika] comment = Bilder för allmän visning path = /mnt/bilder/public browseable = yes read only = yes guest ok = yes [Musik] comment = Musik path = /mnt/music/public browseable = yes read only = yes guest ok = yes I have a network setup around a 4G router "HUAWEI B593" where some computers are connected by WIFI and others by LAN. The server is connected by LAN. On one computer running windows XP I can see the server but are not allowed to acces them. On another computer on the WIFI-net running win7 I cannot see the server at all but I can ping the server and I can see the smb-protocoll is running when sniffing with wireshark. I don't primarily want to use passwords, computers on the lan and wifi should be able to connect without any login-procedure. I'm sure my config is not sufficient but have hard to understand how I should do. Theres a lot of descriptions on the net but most is old and none have been of any help. I'm also confused by the fact that I can not se the sever on my win7-machine even though it communicates with the samba-server. Would be very happy if anyone could spread some light over this mess.

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• Can I assume interface oriented programming as a good object oriented programming?

  - by david

  I have been programming for decades but I have not been used to object oriented programming. But for recenet years, I had a great opportunity to learn OOP, its principles, and a lot of patterns that are great. Since I've learned OOP, I tried to apply them to a couple of projects and found those projects successful. Unfortunately I didn't follow extreme programming that suggests writing test first, mainly because their time frame were tight. What I did for those projects were Identify all necessary classes and create them with proper properties and methods whenever there is dependency between classes, write interface between them see if there is any patterns for certain relationships between classes to replace By successful, I meant that it was quick development effort, the classes can be reused better, and flexible enough so that another programmer does not have to change something else to fix another part. But I wonder if this is a good practice. Of course, I know I need to put writing unit tests first in my work process. But other than that, is there any problem with this approach - creating lots of interfaces - in long term?

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• Juniper SRX1400 VPN

  - by ank

  I have been trying to set up a client VPN on a Juniper SRX1400 without much success. All documentation I found from Juniper and elsewhere does a lot of other (difficult and wonderful) things other than the simple things I want to do. We already have a VPN running on CISCO PIX hardware which we need to put to rest and we pretty much like to replicate the functionality, which is: 1) client makes a request to the outside interface of the SRX1400, 2) client gets authenticated, 3) if successful, then client is assigned all the usual DHCP stuff and becomes part of the network. What privileges this DHCP assigned network has, should be configurable of course with the usual routing/filtering methods. Am I asking for too much from the SRX for this kind of thing? Should I ditch the SRX for VPN and revert to an OpenVPN solution that I had working some time back also and was amazed at the ease of configuration, functionality and features?

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• How to Automatically Create Home Directory for Active Directory User on Solaris (using PowerBroker)

  - by neildeadman

  I have a number of existing users in Active Directory that need a home directory created. They don't log directly in to Solaris but into a service running on that box. If I login as them their home directory gets created and then they can login. This is the same for new users too! As there are a lot of users, I need a way to automate this so new users and existing users have it created automatically. Is this possible??

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• nVidia Driver - Laptop is forced as one of my monitors

  - by vaccano

  I am trying to get my nVidia Driver to correctly configure my multi-monitor setup. I have my laptop in a docking station and two monitors hooked up to it. I had an old driver that this worked correctly with. However, that driver was causing a lot of "Deferred Procedure Calls" so I upgraded to a newer driver. But now I am forced to use my Laptop monitor as one of my monitors. Here is the image in the nVida Control Panel: As you can see, both monitors are recognized, but the only options available are to use one of them with the Laptop Display. Any Ideas? I am running Windows XP (latest updates), I have an nVidia Quadro 1500M. I have tried several different driver versions and all the new ones have this issue.

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• geomipmapping using displacement mapping (and glVertexAttribDivisor)

  - by Will

  I wake up with a clear vision, but sadly my laptop card doesn't do displacement mapping nor glVertexAttribDivisor so I can't test it out; I'm left sharing here: With geomipmapping, the grid at any factor is transposable - if you pass in an offset - say as a uniform - you can reuse the same vertex and index array again and again. If you also pass in the offset into the heightmap as a uniform, the vertex shader can do displacement mapping. If the displacement map is mipmapped, you get the advantages of trilinear filtering for distant maps. And, if the scenery is closer, rather than exposing that the you have a world made out of quads, you can use your transposable grid vertex array and indices to do vertex-shader interpolation (fancy splines) to do super-smooth infinite zoom? So I have some questions: does it work? In theory, in practice? does anyone do it? Does this technique have a name? Papers, demos, anything I can look at? does glVertexAttribDivisor mean that you can have a single glMultiDrawElementsEXT or similar approach to draw all your terrain tiles in one call rather than setting up the uniforms and emitting each tile? Would this offer any noticeable gains? does a heightmap that is GL_LUMINANCE take just one byte per pixel(=vertex)? (On mainstream cards, obviously. Does storage vary in practice?) Does going to the effort of reusing the same vertices and indices mean that you can basically fill the GPU RAM with heightmap and not a lot else, giving you either bigger landscapes or more detailed landscapes/meshes for the same bang? is mipmapping the displacement map going to work? On future cards? Is it going to introduce unsurmountable inaccuracies if it is enabled?

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• diagnose "corrupt file" problems

  - by Matthew

  My computer has been crashing the last couple weeks pretty regularly (at least once a day). A lot of times things I do will display a little notification in the bottom right saying something about a corrupt file. (I'm on Windows XP Pro Service Pack 3). When the computer does crash I get the "blue screen of death" usually. Some of the notifications also advise running the chkdsk utility. I cannot get it to successfully run. Using the command prompt (or even the "tools" menu after right clicking the drive and choosing properties), it will not run the utility (it says "do you want to schedule it to run next boot time" or whatever, which I confirm). The problem is that most of the time after restarting, it doesn't run at all. The few times it does run, it has an error (I can't remember the error right now, it at least says it's ntfs and such) and says disk checking will end. How can I get it to successfully run?

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• Given a database table where multiple rows have the same values and only the most recent record is to be returned

  - by Jim Lahman

  I have a table where there are multiple records with the same value but varying creation dates.  A sample of the database columns is shown here:   1: select lot_num, to_char(creation_dts,'DD-MON-YYYY HH24:MI:SS') as creation_date 2: from coil_setup 3: order by lot_num   LOT_NUM                        CREATION_DATE        ------------------------------ -------------------- 1435718.002                    24-NOV-2010 11:45:54 1440026.002                    17-NOV-2010 06:50:16 1440026.002                    08-NOV-2010 23:28:24 1526564.002                    01-DEC-2010 13:14:04 1526564.002                    08-NOV-2010 22:39:01 1526564.002                    01-NOV-2010 17:04:30 1605920.003                    29-DEC-2010 10:01:24 1945352.003                    14-DEC-2010 01:50:37 1945352.003                    09-DEC-2010 04:44:22 1952718.002                    25-OCT-2010 09:33:19 1953866.002                    20-OCT-2010 18:38:31 1953866.002                    18-OCT-2010 16:15:25   Notice that there are multiple instances of of the same lot number as shown in bold. To only return the most recent instance, issue this SQL statement: 1: select lot_num, to_char(creation_date,'DD-MON-YYYY HH24:MI:SS') as creation_date 2: from 3: ( 4: select rownum r, lot_num, max(creation_dts) as creation_date 5: from coil_setup group by rownum, lot_num 6: order by lot_num 7: ) 8: where r < 100  LOT_NUM                        CREATION_DATE        ------------------------------ -------------------- 2019416.002                    01-JUL-2010 00:01:24 2022336.003                    06-OCT-2010 15:25:01 2067230.002                    01-JUL-2010 00:36:48 2093114.003                    02-JUL-2010 20:10:51 2093982.002                    02-JUL-2010 14:46:11 2093984.002                    02-JUL-2010 14:43:18 2094466.003                    02-JUL-2010 20:04:48 2101074.003                    11-JUL-2010 09:02:16 2103746.002                    02-JUL-2010 15:07:48 2103758.003                    11-JUL-2010 09:02:13 2104636.002                    02-JUL-2010 15:11:25 2106688.003                    02-JUL-2010 13:55:27 2106882.003                    02-JUL-2010 13:48:47 2107258.002                    02-JUL-2010 12:59:48 2109372.003                    02-JUL-2010 20:49:12 2110182.003                    02-JUL-2010 19:59:19 2110184.003                    02-JUL-2010 20:01:03

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• System boots in console + login loop

  - by Imagicien

  I messed up my system while trying to fix permission problems for setting up a LAMP local server. I tried this solution: How to avoid using sudo when working in /var/www? without success. Then I saw this solution: Permissions issue: how can Apache access files in my Home directory? I understood that I had to change the permissions of my root directory (among others), so I executed: sudo chmod 710 / I also changed the user group on / to www-data. I also did these operations on /home. I'm pretty sure one of those commands broke something, because it's the last commands I executed, and after that, my system showed strange/broken behavior: Firefox stopped showing pages Some icons got replaced by an red X icon (meaning "Icon not found" I guess) Applications refused to launch (no reaction) After rebooting: I got a strange graphical message talking about not being able to mount something, asking me if I wanted to wait, and talking about /tmp (I forgot the message since I was in shock) My system now boots in console, and when I login, it flashes unsignificant stuff* before re-asking me to login. My important data is on Ubuntu One. I'd prefer not having to reinstall from scratch. Is there a way to regain access to my system? Thanks a lot for your help. *Looks like a terminal header with the name of the OS and other info. Doesn't seem important.

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• Amazon EC2, fastest way to get a node into an existing cluster

  - by imaginative

  I'm new to Amazon AWS. A lot of the time I hear about people folks spawning instances and almost instantly putting them behind a load balancer and into an existing cluster. In the traditional world of managed machines, this would include provisioning hardware, installing an OS, configuring the network on the machine and once the network is available, use a tool of your choice such as CFengine, Puppet or Chef to bootstrap the machine based on its class. It seems like there are "shortcuts" that are able to get a server of a particular class up and running in Amazon EC2. If I have a particular stack running on my server, such as erlang, tomcat6 etc.. what's the fastest way to get these up and running and hooked into Amazon's load balancer? From network, to software stack to kernel tuning? Is it a combination of creating an AMI then running a tool like Puppet against the new instance? Any idea

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