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• Do I need to notify a user if I am using statistics software in an iPhone app?

  - by Chris

  Hello, I am currently creating a (very simple) Objective-C client to send basic statistical data to my server for an iPhone app - just things like the state of the app (first-launch or launch, error, etc), along with the make/model/version (i.e.: "iPod touch 4.2"). No personally identifiable information or location data is sent. Is there anything, in the Apple Developer agreement or otherwise, that states that I must notify the user if I am doing this? I'm not interested in selling the data or anything, I just want to use the data to make my apps better. I am not adverse to telling the user I am doing this if it is required, I just don't want to scare the users (the paranoid "oooh, they're tracking me, they know exactly where I am" crowd) if I don't have to. Thanks for any advice.

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• when should a database table be broken into multiple tables with relations?

  - by GSto

  I have an application that needs to store client data, and part of that is some data about their employer as well. Assuming that a client can only have one employer, and that the chance of people having identical employer data is slim to none, which schema would make more sense to use? Schema 1 Client Table: ------------------- id int name varchar(255), email varchar(255), address varchar(255), city varchar(255), state char(2), zip varchar(16), employer_name varchar(255), employer_phone varchar(255), employer_address varchar(255), employer_city varchar(255), employer_state char(2), employer_zip varchar(16) **Schema 2** Client Table ------------------ id int name varchar(255), email varchar(255), address varchar(255), city varchar(255), state char(2), zip varchar(16), Employer Table --------------------- id int name varchar(255), phone varchar(255), address varchar(255), city varchar(255), state char(2), zip varchar(16) patient_id int Part of me thinks that since are clearly two different 'objects' in the real world, seperating them out into two different tables makes sense. However, since a client will always have an employer, I'm also not seeing any real benefits to seperating them out, and it would make querying data about clients more complex. Is there any benefit / reason for creating two tables in a situation like this one instead of one?

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• DataObjectBase

  DataObjectBase - the new Object class for data objects!

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• how to have files created by CMS have the same ownership as SSH user

  - by Cam

  I am having difficulty on our ubuntu server whereby I have an SSH user that when I create files using this user the ownership is web_user:www-data The problem is when a file is uploaded or created using a content management system like joomla. When files are uploaded through Joomla - such as components / modules... The ownership is set to www-data:www-data This means that I need to then chown all new files to web_user:www-data so we can edit the files. Is there a way to set for a directory and sub-directories that all new files created have the ownership of web_user:www-data? Do I need to use something like setuid or setgid? Any help would be greatly appreciated.

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• Deduping your redundancies

  - by nospam(at)example.com (Joerg Moellenkamp)

  Robin Harris of Storagemojo pointed to an interesting article about about deduplication and it's impact to the resiliency of your data against data corruption on ACM Queue. The problem in short: A considerable number of filesystems store important metadata at multiple locations. For example the ZFS rootblock is copied to three locations. Other filesystems have similar provisions to protect their metadata. However you can easily proof, that the rootblock pointer in the uberblock of ZFS for example is pointing to blocks with absolutely equal content in all three locatition (with zdb -uu and zdb -r). It has to be that way, because they are protected by the same checksum. A number of devices offer block level dedup, either as an option or as part of their inner workings. However when you store three identical blocks on them and the devices does block level dedup internally, the device may just deduplicated your redundant metadata to a block stored just once that is stored on the non-voilatile storage. When this block is corrupted, you have essentially three corrupted copies. Three hit with one bullet. This is indeed an interesting problem: A device doing deduplication doesn't know if a block is important or just a datablock. This is the reason why I like deduplication like it's done in ZFS. It's an integrated part and so important parts don't get deduplicated away. A disk accessed by a block level interface doesn't know anything about the importance of a block. A metadata block is nothing different to it's inner mechanism than a normal data block because there is no way to tell that this is important and that those redundancies aren't allowed to fall prey to some clever deduplication mechanism. Robin talks about this in regard of the Sandforce disk controllers who use a kind of dedup to reduce some of the nasty effects of writing data to flash, but the problem is much broader. However this is relevant whenever you are using a device with block level deduplication. It's just the point that you have to activate it for most implementation by command, whereas certain devices do this by default or by design and you don't know about it. However I'm not perfectly sure about that ? given that storage administration and server administration are often different groups with different business objectives I would ask your storage guys if they have activated dedup without telling somebody elase on their boxes in order to speak less often with the storage sales rep. The problem is even more interesting with ZFS. You may use ditto blocks to protect important data to store multiple copies of data in the pool to increase redundancy, even when your pool just consists out of one disk or just a striped set of disk. However when your device is doing dedup internally it may remove your redundancy before it hits the nonvolatile storage. You've won nothing. Just spend your disk quota on the the LUNs in the SAN and you make your disk admin happy because of the good dedup ratio However you can just fall in this specific "deduped ditto block"trap when your pool just consists out of a single device, because ZFS writes ditto blocks on different disks, when there is more than just one disk. Yet another reason why you should spend some extra-thought when putting your zpool on a single LUN, especially when the LUN is sliced and dices out of a large heap of storage devices by a storage controller. However I have one problem with the articles and their specific mention of ZFS: You can just hit by this problem when you are using the deduplicating device for the pool. However in the specifically mentioned case of SSD this isn't the usecase. Most implementations of SSD in conjunction with ZFS are hybrid storage pools and so rotating rust disk is used as pool and SSD are used as L2ARC/sZIL. And there it simply doesn't matter: When you really have to resort to the sZIL (your system went down, it doesn't matter of one block or several blocks are corrupt, you have to fail back to the last known good transaction group the device. On the other side, when a block in L2ARC is corrupt, you simply read it from the pool and in HSP implementations this is the already mentioned rust. In conjunction with ZFS this is more interesting when using a storage array, that is capable to do dedup and where you use LUNs for your pool. However as mentioned before, on those devices it's a user made decision to do so, and so it's less probable that you deduplicating your redundancies. Other filesystems lacking acapability similar to hybrid storage pools are more "haunted" by this problem of SSD using dedup-like mechanisms internally, because those filesystem really store the data on the the SSD instead of using it just as accelerating devices. However at the end Robin is correct: It's jet another point why protecting your data by creating redundancies by dispersing it several disks (by mirror or parity RAIDs) is really important. No dedup mechanism inside a device can dedup away your redundancy when you write it to a totally different and indepenent device.

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• how to have files created by CMS have the same ownership as SSH user

  - by Cam

  I am having difficulty on our ubuntu server whereby I have an SSH user that when I create files using this user the ownership is web_user:www-data The problem is when a file is uploaded or created using a content management system like joomla. When files are uploaded through Joomla - such as components / modules... The ownership is set to www-data:www-data This means that I need to then chown all new files to web_user:www-data so we can edit the files. Is there a way to set for a directory and sub-directories that all new files created have the ownership of web_user:www-data? Do I need to use something like setuid or setgid? Any help would be greatly appreciated.

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• Retrieving database column using JSON [migrated]

  - by arokia

  I have a database consist of 4 columns (id-symbol-name-contractnumber). All 4 columns with their data are being displayed on the user interface using JSON. There is a function which is responisble to add new column to the database e.g (countrycode). The coulmn is added successfully to the database BUT not able to show the new added coulmn in the user interface. Below is my code that is displaying the columns. Can you help me? table.php $(document).ready(function () { // prepare the data var theme = getDemoTheme(); var source = { datatype: "json", datafields: [ { name: 'id' }, { name: 'symbol' }, { name: 'name' }, { name: 'contractnumber' } ], url: 'data.php', filter: function() { // update the grid and send a request to the server. $("#jqxgrid").jqxGrid('updatebounddata', 'filter'); }, cache: false }; var dataAdapter = new $.jqx.dataAdapter(source); // initialize jqxGrid $("#jqxgrid").jqxGrid( { source: dataAdapter, width: 670, theme: theme, showfilterrow: true, filterable: true, columns: [ { text: 'id', datafield: 'id', width: 200 }, { text: 'symbol', datafield: 'symbol', width: 200 }, { text: 'name', datafield: 'name', width: 100 }, { text: 'contractnumber', filtertype: 'list', datafield: 'contractnumber' } ] }); }); data.php <?php #Include the db.php file include('db.php'); $query = "SELECT * FROM pricelist"; $result = mysql_query($query) or die("SQL Error 1: " . mysql_error()); $orders = array(); // get data and store in a json array while ($row = mysql_fetch_array($result, MYSQL_ASSOC)) { $pricelist[] = array( 'id' => $row['id'], 'symbol' => $row['symbol'], 'name' => $row['name'], 'contractnumber' => $row['contractnumber'] ); } echo json_encode($pricelist); ?>

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• Compare two tables in sql

  You can compare two sql table, find the unmatched data from 1 table 2 another

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• Postgres backup

  - by Abbass

  Hello, I have a Bacula script that does an automatic backup of a Postgres Database. The script makes two backups using (pg_dump) of the data base : The schema only and the data only. /usr/bin/pg_dump --format=c -s $dbname --file=$DUMPDIR/$dbname.schema.dump /usr/bin/pg_dump --format=c -a $dbname --file=$DUMPDIR/$dbname.data.dump The problem is that I can't figure out how to restore it with pg_restore. Do I need to create the database and the users before then restore the schema and finally the data. I did the following : pg_restore --format=c -s -C -d template1 xxx.schema.dump pg_restore --format=c -a -d xxx xxx.data.dump This first restore creates the database with emtpy tables but the second gives many error like this one : pg_restore: [archiver (db)] COPY failed: ERROR: insert or update on table "Table1" violates foreign key constraint "fkf6977a478dd41734" DETAIL: Key (contentid)=(1474566) is not present in table "Table23". Any ideas?

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• Should I redo an abandoned project with Lightswitch?

  - by Elson

  I had a small project that I was doing on the side. It was basically a couple of forms linked to a DB. Access was out, because it was a specifically meant to be a web application. Being a small project I used ASP.NET Dynamic Data, but, for various reasons, the project ended before deployment. I met the client recently, and he said there was a need for it still. I'm considering restarting the project with Dynamic Data, but I've seen some Lightswitch demos, and was suitably impressed with the BETA. I will wait for RTM if I use it, but is it a good idea to use Lightswitch to replace the Dyanmic Data? The amount of work I put into the Dynamic Data site isn't really an issue. Additional information: It's a system that tracks production in a small factory, broken down by line, machine, section and will generate reports. I would guess that the data structure will remain fairly constant over time, but that the reporting requirements will grow. The other thing is that the factory is part of a larger group, and I'm hopeful that, if this system succeeds, similar work with be forthcoming for other factories.

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• Getting Started With Knockout.js

  - by Pawan_Mishra

  Client side template binding in web applications is getting popular with every passing day. More and more libraries are coming up with enhanced support for client side binding. jQuery templates is one very popular mechanism for client side template bindings. The idea with client side template binding is simple. Define the html mark-up with appropriate place holder for data. User template engines like jQuery template to bind the data(JSON formatted data) with the previously defined mark-up.In this...(read more)

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• How does the fstab 'defaults' option work? Is relatime recommended?

  - by hushs

  I know the fstab defaults option means this: rw,suid,dev,exec,auto,nouser,async. But what if I want to add one more option, for example relatime, should I still add defaults too or they are applied anyway? Is it needed to add at least one option? Some examples: 1. UUID=bfb42838-d866-4233-9679-96e7536356df /media/data ext3 defaults 0 2 2. UUID=bfb42838-d866-4233-9679-96e7536356df /media/data ext3 0 2 3. UUID=bfb42838-d866-4233-9679-96e7536356df /media/data ext3 defaults,relatime 0 2 4. UUID=bfb42838-d866-4233-9679-96e7536356df /media/data ext3 relatime 0 2 Is the (2) correct(no option at all)? Are the (1) and (2) the same? Are the (3) and (4) the same? Furthermore, I read in the Ubuntu Community Documentation that in Ubuntu 8.04 relatime was used as default for linux native file systems. Is it still true for 12.04? If yes, then why do I see this if I use the mount command: /dev/sda2 on / type ext4 (rw,errors=remount-ro) If no, why not? It isn't recommended to use relatime now? I just wanted to apply it to my non system partitions, it is a good idea? EDIT: I found an other command to list the mounted partitions and their options: cat /proc/mounts This is the result of a partition mounted with the defaults option in fstab: /dev/sdb2 /media/adat ext3 rw,relatime,errors=continue,barrier=1,data=ordered 0 0 This is the output of mount for the same partition: /dev/sdb2 on /media/adat type ext3 (rw) And here is both result if the same partition mounted from Nautilus as a non-root user: /dev/sdb2 /media/adat ext3 rw,nosuid,nodev,relatime,errors=continue,barrier=1,data=ordered 0 0 /dev/sdb2 on /media/adat type ext3 (rw,nosuid,nodev,uhelper=udisks) So it looks like relatime is used if we mount an ext partition in 12.04. So it is unneeded to add it manually. So my problem is broadly solved. But I still can't see why the options that should be in the defaults are not listed even with the cat /proc/mounts. Maybe there is a third and even better method to list the partition mount options :)

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• EntityDataSource Control Basics

  The Entity Framework can be easily used to create websites based on ASP.NET. The EntityDataSource control, which is one of a set of Web Server Datasource controls, can be used to to bind an Entity Data Model (EDM) to data-bound controls on the page. Thse controls can be editable grids, forms, drop-down list controls and master-detail pages which can then be used to create, read, update, and delete data. Joydip tells you what you need to get started.

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• Excel chart won't update, based on calculated cells

  - by sam SJL

  I have an Excel document (2007) with a chart (Clustered Column) that gets its Data Series from cells containing calculated values The calculated values never change directly, but only as a result of other cells in the sheet changing When I change other cells in the sheet, the Data Series cells are recalculated, and show new values - but the Chart based on this Data Series refuses to update automatically I can get the Chart to update by saving/closing, or toggling one of the settings (such as reversing x/y axis and then putting it back), or by re-selecting the Data Series Every solution I have found online doesn't work - I have Calculation set to automatic - Ctrl+Alt+F9 updates everything fine, EXCEPT the chart - I have recreated the chart several times, and on different computers - I have tried VBA scripts like: Application.Calculate Application.CalculateFull Application.CalculateFullRebuild ActiveWorkbook.RefreshAll DoEvents None of these update or refresh the chart I do notice that if I type over my Data Series, actual numbers instead of calculations, it will update the chart - it's as if Excel doesn't want to recognize changes in the calculations Has anyone experienced this before or know what I might do to fix the problem? Thank you

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• Silverlight 4 + RIA Services - Ready for Business: Authentication and Personalization

  To continue our series,  In real business applications our data is often very valuable and as such we need to know who is accessing what data and control certain data access to only users with privilege.  Luckily this is very easy to do with RIA Services.  For example, say we want to let only authenticated users access our data in this example.   That is as easy to accomplish as adding an attribute, see line 2 below.    1: [EnableClientAccess] 2: ...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Are Sony Vaio S series or T series laptops compatible with both windows 7 and Ubuntu 12.04 in dual-boot installation

  - by rini

  I am planning to buy a new laptop which is suitable for both Ubuntu 12.04 and windows 7 in dual boot configuration. I am looking for Sony Vaio two models with configurations: 13.3" S series Customizable laptop ( SVS131190S) 3rd gen Intel® Core™ i5-3210M processor (2.50GHz / 3.10GHz with Turbo Boost) Intel® HD Graphics 4000 4GB (4GB fixed onboard + 1 open slot) DDR3-1333Mhz 500GB (5400rpm) hard drive 13.3" T series Customizable ultrabook 3rd gen Intel® Core™ i7-3517U processor (1.90GHz / 3.00GHz with Turbo Boost) Intel® HD Graphics 4000 500GB (5400rpm) + 32GB MLC hybrid hard drive with RAID 0 6GB (4GB fixed onboard + 2GB removable) DDR3-1333Mhz Can anyone please tell me which laptop will function better for dual booting? Any help/comments are really appreciated.

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• Developing with Oracle ADF Mobile and ADF Business Components Backend

  - by Shay Shmeltzer

  It's great to finally have the Oracle ADF Mobile solution out there. If you are not familiar with ADF Mobile - it basically lets you build applications that run on iOS and Android devices using the concepts you already know - components based UI constructions (same idea as JSF), taskflows, data controls, Java and of course JDeveloper. I created one demo that shows how to build an on-device application that gets data from local Java files (that run on the device - yes we do Java on iOS too) - you can see it here. However, one thing many of you might be wondering is how can you get data from your database into these mobile applications. Well if you already built your data access with Oracle ADF Business Components then here is a two step video demo that shows you what to do. The steps are: 1. Expose ADF Business Components as Services 2. Create an ADF Mobile application that consumes the above services with the Web service data control Simple right? That's the whole point of ADF Mobile - making on device application development as simple as possible. Try it out on your device.

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• What are the advantages of storing xml in a relational database?

  - by Chris

  I was poking around the AdventureWorks database today and I noticed that a number of tables (HumanResources.JobCandidate and Sales.Individual for example) have a column which is storing xml data. What I would to know is, what is the advantage of storing basically a database table row's worth of data in another table's column? Doesn't this make it difficult to query off of this information? Or is the assumption that the data won't need to be queried and just needs to be stored?

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• Forked a project, where do my version numbers start?

  - by TheLQ

  I have forked a project and have changed lots of it. This fork isn't just a small feature change here and a buried bug fix there, its a pretty substantial change. Only most of the core code is shared. I forked this project at v2.5.0. For a while I've started versioning my fork at v3.0 . However I'm not sure if this is the right way, mainly because when that project hits v3.0, things get confusing. But I don't want to start over at v1.0 or v0.1 because that implies infancy, instability, and non-refindness of a project. This isn't true, as most of the core code is very refined and stable. I'm really lost on what to do, so I ask here: Whats the standard way to deal with this kind of situation? Do most forks start over again, bump up version numbers, or do something else that I'm not aware of.

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• How do I count Internal Logical Files (ILF) and External Inputs (EI) for a dynamic form entry page?

  - by DmytroL

  Assuming I have an applicant information entry screen, the number and types of fields on which can be defined by the system administrator, how do I go about counting the number of Internal Logical Files (ILFs) and Data Element Types (DETs) for the related data functions? So far I have come up with something like this: ILF #1 (control information): Field Metadata, 1 RET, ~3 DET (name, type, mandatory) ILF #2 (business data): Applicant Data, most likely 1 RET, but how many DET? Of course I could count it as 2 DET (Field ref, Value), but I am not sure that would be correct And when it comes to an External Input (EI), say, "Add New Applicant", things become even more complicated, because the number of DET corresponding to the user-editable fields is totally dependent on the control information in ILF #1, and I am out of ideas here... Anyone fancy to help with that? Thanks in advance!

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• EMC Lays Out Global Storage Vision

  The data storage giant envisions a massive, global storage network without distance, performance or data consistency limitations.

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• Announcing Oracle MDM YouTube Channel!

  - by Michelle Kimihira

  We are excited about new Oracle MDM YouTube channel where you can watch videos related to Master Data Management. You will find product videos and customer videos. Be sure to subscribe to the channel, so you don't miss out! Spend a moment to visit us at: http://www.youtube.com/oraclemdm. Additional Information Product Information on Oracle.com: Oracle Fusion Middleware Follow us on Twitter Read and Subscribe to our bi-monthly Data Integration and Master Data Management Newsletter

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• Solutions for iOS collaborative sync (iCloud CoreData, CouchDB)?

  - by mluisbrown

  I'm developing an iOS app where one of the features will be allowing users to share and collaborate on data (e.g. lists). From everything I've read and based on the way that iCloud CoreData sync works I assume that it would not be a good fit for the following reasons, but I wanted to make sure I wasn't missing anything, as I'd prefer not to use a 3rd party syncing solution if at all possible: iCloud sync of any kind (CoreData, Document or Key / Value pairs) can only ever be between devices that use the same iCloud account, so it's designed for a single user syncing data over multiple devices. Any kind of collaborative sync (several people editing the same document / list) simultaneously would be limited to everyone have the same iCloud account. Cases of people sharing the same iCloud account is usually limited to, for example, husband and wife or similar close relationships for a small number of people. iCloud Core Data sync is for ensuring that each sync'd device has the same data. It doesn't seem to allow syncing just a subset of the data, so scenarios in which each user has their own documents and is only sharing / collaborating on a subset of them are not supported. And I'm not even mentioning the well document problems with iCloud CoreData syncing which may or may not have been resolved with iOS 7. Given the above, it would seem that CouchDB (with TouchDB) would be a better option, as it seems to support everything I need. What other options are there that people can recommend?

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• OSXplanet: Updating cloud images

  - by Turgs

  Hello I'm using OSXplanet (which is a mac app based on xplanet) to view satellite and rendered images of the earth (or other planets) as the desktop background on my laptop. The images and data refresh regularly as data is updated, such as cyclones, clouds, weather, volcanoes, etc. I have Cloud Data set to refresh every 3 hours, but the resulting image never changes. By default, OSXplanet seems to be trying to get image data from Iowa State University. Can I modify OSXplanet to set it to pull cloud image data from a different server location listed on http://xplanet.sourceforge.net/clouds.php? Thanks Turgs

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• Approach to Authenticate Clients to TCP Server

  - by dab

  I'm writing a Server/Client application where clients will connect to the server. What I want to do, is make sure that the client connecting to the server is actually using my protocol and I can "trust" the data being sent from the client to the server. What I thought about doing is creating a sort of hash on the client's machine that follows a particular algorithm. What I did in a previous version was took their IP address, the client version, and a few other attributes of the client and sent it as a calculated hash to the server, who then took their IP, and the version of the protocol the client claimed to be using, and calculated that number to see if they matched. This works ok until you get clients that connect from within a router environment where their internal IP is different from their external IP. My fix for this was to pass the client's internal IP used to calculate this hash with the authentication protocol. My fear is this approach is not secure enough. Since I'm passing the data used to create the "auth hash". Here's an example of what I'm talking about: Client IP: 192.168.1.10, Version: 2.4.5.2 hash = 2*4*5*1 * (1+9+2) * (1+6+8) * (1) * (1+0) Client Connects to Server client sends: auth hash ip version Server calculates that info, and accepts or denies the hash. Before I go and come up with another algorithm to prove a client can provide data a server (or use this existing algorithm), I was wondering if there are any existing, proven, and secure systems out there for generating a hash that both sides can generate with general knowledge. The server won't know about the client until the very first connection is established. The protocol's intent is to manage a network of clients who will be contributing data to the server periodically. New clients will be added simply by connecting the client to the server and "registering" with the server. So a client connects to the server for the first time, and registers their info (mac address or some other kind of unique computer identifier), then when they connect again, the server will recognize that client as a previous person and associate them with their data in the database.

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