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• Deleted files not increasing available free space on Ubuntu (as reported by df -h)

  - by Homunculus Reticulli

  I am writing data munging scripts (python and bash), to munge data and import large quantities of text files into a database. I am currently in the test phase, so I am generating several K's of files and deleting them (the files consume about 20G of space). After a test run, I delete the files (sometimes without having imported into the database). I notice that there is a steady decrease in the amount of free space on my disk (as reported by df -h). I don't understand this, as I use rm * (in the data directory), and in the cases where I use Nautilus, I empty the Trash bin as well. Similarly, I notice that when I import the data into the (postgresql) database, and then delete the data from the tables using DELETE FROM tablename;, the size consumed in the postgresql data directory does not go down either. Currently, I have lost approximately 200G from hard drive, and I need to reclaim that - but don't know what to do to reclaim it - any ideas?. I am running Ubuntu 10.0.4 LTS + postgresql 8.4

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• Quadrant for SQL Server 2008, not earlier versions

  I had forgotten that you can use SQL Server Modeling’s awesome Quadrant tool only with SQL Server 2008, not earlier versions of SQL Server. I tried to connect to a remotely hosted database today and kept getting this error message when trying to open tables: I searched and searched for information on "Quadrant" plus this error and only came up with two results that were from 2008. I looked at the FAQs and saw nothing about version support. I know it’s written down somewhere...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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• enable iptables firewall on linux

  - by user13278061

   Here is a very basic set of instruction to setup a simple iptables firewall configuration on linux (redhat) Enable firewall log as root thenenter the following command, it launch a text gui #> setup first screen: Choose firewall configuration second screen: choose "Enabled" then "Customize" third screen: select you interface in "Trusted Devices", select "Allow Incoming" for "SSH" "Telnet" "FTP" (add eventually other ports, then press "OK" (2 times, then "Quit") At that point the firewall is enabled. You can start/stop/monitor using service iptables start/stop/status Change timeout to changed the tcp established connection timeout #> echo 120 >    /proc/sys/net/ipv4/netfilter/ip_conntrack_tcp_timeout_established Monitor connection in iptables tables for example if you want to track a connection establish from a host  152.68.65.207 #> cat /proc/net/ip_conntrack |grep 152.68.65.207

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• PHP URL Rewrite engine for small project

  - by Jens Törnell

  I use PHP. I want to setup a micro site as a prototype, where I can work with the frontend only, separated from any CMS. URL Rewrite I also want the URL rewrite to be correct, like http://www.test.com/products/tables/green/little-wood123/ Question(s) Is there any free class for URL rewriting? I searched but found none. If that is not the way to go, what framework is nice for this? It should be tiny, easy to use and support URL rewrite.

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• New and Improved Patch for FRM-40654 Errors in Purchase Orders and Requisitions

  - by user793044

  Development has modified the code in purchase orders and requisition forms to prevent error FRM-40654 when there are trailing spaces in the tables for most of the fields.  After applying the patch, the form will still display the error but a requery will allow you to save the transaction. For the scenarios not covered in the fix, the FND log will now display the specific field that causes the error.  This an example of the FND log for one document where the note_to_vendor has trailing spaces: Form note_to_vendor oldvalue Database  note_to_vendor newvalue Failed first if statement when comparing fields FRM-40654: Record has been updated. Requery block to see change. This new patch includes the fix in Patch 14204845:"In Oracle Purchasing, leading or trailing spaces in po lines data was resulting in errors".  For more information on FRM-40654 errors see the patching section of Note 1203796.1. Be proactive and apply Patch 14479586:R12.PO.B for 12.1.3 or Patch 14569747 for 11.5.10 now!

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• Where can I get a definition of how the code is laid out in VB.NET 2010?

  - by ByteWorker

  I am just starting out learning Visual Basic 2010. I have books and videos. The books all seem to be written for people who have some programming experience, even the books that say they are for beginners. The videos were great until they started talking about variables. I got the basics of them but they started into complicated variables and I don’t see the need for them right away. Where can I go to see code for fairly intricate applications written out, with an over lay of definitions of which part of the code is a method as opposed to a class and so on? Also, I am working at a company that does not use SQL. So I need to use Access 2007 for all of my tables. Is there much of a difference to the coding?

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• Why creating a new MDX language instead of extending SQL?

  - by DReispt

  I have a long experience with SQL, but recently began working with datawarehouse and OLAP technologies: building fact and dimension tables, that then are queried using MDX (MultiDimensional eXpressions). The problem is that MDX works with a completely different logic compared to SQL, and it's a whole new learning curve even for someone with a strong SQL background. Yes, MDX allows you to do things that would be hard or almost impossible with plain SQL. But sometimes it's frustrating to be hours around an MDX to do something you know you could achieve in minutes using SQL (ok, you can tell me to RTFM ...). But why go on to the trouble of creating a new completely different language when you could build on SQL, extend it to add the features needed by OLAP applications?

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• How much will be difference between building php sites with SVN and not using it

  - by user1315279

  I have been developing PHP sites for about 5 years but never used SVN. But i am going to start in new company and they use SVN. Tomorrow is my first day. I want to know that how site developement differes with SVN. WITHOUT SVN I make test account on Linux server via cpanel I make database tables Put all files in /home/user/public_html and i use PHP designer as IDE to edit files and i can see the results on test.mydomain.com I just want to know how much will be the difference with SVN. I mean what will be the steps

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• Can i create a private shop with a public gallery with magento?

  - by Sylario

  I want to do a shop with a public gallery listing all my products, with textes and images. The gallery is not a shop, you cannot buy. Behind it, i want a private section with a shop, where the same products are listed in tables with all the necessary options to buy. Each customer for the shop will have a separate account. In the shop and the gallery products are on different page according to their categories. Is magento able to do that ?

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• AJAX spreadsheet editor interfaced to own website

  - by Ole Tange

  My website has records that are tables. I would like for my users to be able to edit these records in an easy way. Currently they download a .csv-file, edit it in their favourite spreadsheet, and upload it again. But this often fails (they upload in wrong format or edit fields that they are not supposed to touch). I would therefore like to present the users with an editor directly on the website. So just like you can have WYSIWYG editors in CMSes for text I would like to have it for spreadsheets. One solution would be to interface my website with GoogleDoc and have the users edit the files using GoogleDoc's spreadsheet, and some how get the sheet back when they are done, but I do not know if this is possible at all.

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• SSIS is Case-Sensitive

  - by andyleonard

  Introduction SSIS is case-sensitive even if the database is case-insensitive. Imagine... ... you work in an ETL shop where someone who believes in natural keys won the Battle of the Joins. Imagine one of your natural keys is a string. (I know it's a stretch... play along!). Let's build some tables to sketch it out. If you do not have a TestDB database, why not? Build one! You'll use it often. Use TestDB go Create Table SSIS1 ( StrID char ( 5 ) , Name varchar ( 15 ) , Value int ) Insert Into SSIS1...(read more)

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• Protecting the integrity of a game state while minimizing amount of data sent

  - by espais

  I'm developing a game in PHP/jQuery, and naturally have to be wary of any sort of data coming from the client. At present, I have tables of data representing the map (2D roguelike), monsters, items, and player(s). Initially, my thought was to simply package it all in a JSON object and send it every game tick, however when actually looking at the data I realized that's quite a large packet to be sending. So, my question is what is a good approach for minimizing data sent to the client? Obviously I would need to figure out some way of validating whatever it sends back. Initially we'd hoped to do some minimal verification on the client-side, but each time we thought of one thing we could do it is immediately invalidated with tools like Firebug. Kind of an open question I realize, but we want to get this right before we move on with our implementation so we don't have to shoehorn in bugfixes later on.

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• Getting Started with the SSAS Tabular Model

  SSAS Tabular models are in-memory databases that model data with relational constructs such as tables and relationships, in order to provide a rapid and powerful way of providing self-service BI to client applications such as Microsoft Excel and Microsoft Power View. You’ve deployed SSAS in tabular mode, and deployed Adventureworks into it. What next? Rob Sheldon explains all. Check SQL Server performance at a glanceWe consulted 1000 SQL Server professionals to make SQL Monitor’s UI as clear as possible. Start monitoring with a free trial.

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• Listing SQL Columns

  - by Bunch

  When I am writing up stored procedures in SSMS sometimes I need to know what column types are used in a table. For instance I will know the table name but I might not remember exactly the length of a varchar column or if a column stored the data as an integer or varchar. And I may not want to scroll through all the tables in Object Explorer to find the one I want. A lot of times it is easier if I can just write a quick query to pull up the information I need. The syntax to do something like this is pretty easy. SELECT COLUMN_NAME, DATA_TYPE, CHARACTER_MAXIMUM_LENGTH FROM yourdbname.information_schema.columns WHERE TABLE_NAME = ‘yourtablename’ After running that you will get a listing in the Results pane just like any other query with the column name, data type and length (if any). Technorati Tags: SQL

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• Using INSERT / OUTPUT in a SQL Server Transaction

  Frequently I find myself in situations where I need to insert records into a table in a set-based operation wrapped inside of a transaction where secondarily, and within the same transaction, I spawn-off subsequent inserts into related tables where I need to pass-in key values that were the outcome of the initial INSERT command. Thanks to a Transact/SQL enhancement in SQL Server, this just became much easier and can be done in a single statement... WITHOUT A TRIGGER! Join SQL Backup’s 35,000+ customers to compress and strengthen your backups "SQL Backup will be a REAL boost to any DBA lucky enough to use it." Jonathan Allen. Download a free trial now.

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• What is the best way to work with large databases in Java depending on context?

  - by user19000

  We are trying to figure out the best practice for working with very large DBs in Java. What we do is a kind of BI (business Intelligence), i.e analyzing very large DBs, and using them to create intermediate DBs that represent intelligent knowledge of the DBs. We are currently using JDBC, and just preforming queries using a ResultSet. As more and more data is being created, we are wondering whether more appropriate ways exist for parsing and manipulating these large DBs: We need to support 'chunk' manipulation and not an entire DB at once(e.g. limit in JDBC, very poor performance) We do not need to be constantly connected since we are just pulling results and creating new tables of our own. We want to understand JDBC alternatives, with respect to advantages and disadvantages. Whether you think JDBC is the way to go or not, what are the best practices to go by depending on context (e.g. for large DBs queried in chunks)?

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• I need to create an employee schedule/appointments program, but I don't know how to set it up

  - by robz228

  I work for a gym. I am the programmer, its just me, nobody else! Gets really frustrating when there's nobody to bounce conceptual ideas off of. I'm getting rid of our archaic paper binder systems for tracking appointments and what not. I've made a lot of things successfully already, now I'm trying to tackle the personal training department. What I want: Trainer information and work schedule Appointment booking that can be done by time slot with all available trainers for that time, or by trainer with all available hours for that trainer What I've tried so far: I started with an 'appointments' database, a 'trainers' database, and a 'schedules' database. This became so complicated trying to fit the schedule in that I scrapped it. Does anyone know know the best way to structure the tables for this and how to sort of make them communicate correctly? I don't need specific code, I just need help understand how to make this thing!

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• New .Net Authentication in 4.5.1

  - by Aligned

  Originally posted on: http://geekswithblogs.net/Aligned/archive/2013/11/05/new-.net-authentication-in-4.5.1.aspxThere has been a lot of traffic on my post about Simple Membership that came with the File new Project MVC 4 in 2012. I was reading the release notes for Visual Studio 2013 and .Net 4.5.1 and it mentioned a new/updated Authentication approach. “ASP.NET Identity is the new membership system for ASP.NET applications. ASP.NET Identity makes it easy to integrate user-specific profile data with application data. ASP.NET Identity also allows you to choose the persistence model for user profiles in your application. You can store the data in a SQL Server database or another data store, including NoSQL data stores such as Windows Azure Storage Tables” There’s a great page on the asp.net site that gives an introduction, overview, how to use it, and how to migrate to it. I won’t be doing a new project for awhile at work, but I’ll definitely be looking into this more when I get the time.

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• Is there such a concept as "pseudo implementation" in software development?

  - by MachuPichu

  I'm looking for a label to describe the practice of using human-based computation methods or other means of "faking" an algorithm for the sake of getting a product or demo off the ground quickly without spending the time to develop an technical/scalable/analytical solution? Eg: using Amazon Turk to count the number of empty tables in a restaurant. I'm also looking to learn more about this subject, but not sure what to search for. Human-based computation is only one method, I'm interested in the general idea of pseudo-implementation. Any ideas, recommended reading? Thanks

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• What is the correct pattern to use in this case?

  - by nulliusinverba

  I'm sure this scenario has arisen before, and I want to know what experience has taught to be the best solution. I have a number of classes that are all of a kind. Say all the objects are "Content". They may be "Article", or "Book" for example. The reason I want the "Content" abstraction is because I want to define a number of behaviours for all "Content" objects and not have to build a new DB Table and 10 classes of essentially the same code for each type of "Content". For example, to attach a "Tag" or a "Premise" to a content object would be much nicer if, say, I just had two columns one for ContentID and one for TagID. A solution I've played around with is to have a Content table with a unique ID, and then to have foreign key references on all the other tables (Book, Article, etc). This has actually proven quite solid, but I'm just not sure about it. Do you know how to call this described pattern?

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• Using UNION in a query with PHP [migrated]

  - by work

  I have an SQL query which links 3 tables using UNION: $sql ="(SELECT Drive.DriveID,Ram.Memory from Drive,Ram where Drive.DriveID = Ram.RamID) UNION (SELECT Drive.DriveID,External.Memory from Drive, External where Drive.DriveID = External.ExtID)"; Suppose I want to get Ram.Name as well. How do I do this? If I use Ram.Name in the first SELECT statement it would not produce the correct result. Any method for tackling this? I want to do it using UNION.

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• Software Design and documentation – what do people use that has proved valuable?

  - by eddyparkinson

  When creating software, what do you use to design, document and visualize. Looking for evidence/examples. e.g. Use cases, Pseudo code, Gantt chats, PERT charts, DFD, decision trees, decision tables (Answers maybe used to help teach students) What do you use to help with creating software. Also why; when has it proved valuable? --- Edit -- Proved valuable: The pattern so far suggests that the style of UML tool used is linked to an objective. e.g. "get it straight in MY head", explain to business mangers, quality control.

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• Q: Is it me or is ADO.NET **BACKWARDS**? (20 replies)

  To simplify the question, I create 2 tables in SQL. Table 1 has columns: ColumnA (PK), ColumnB and Type. Table 2 has columns: A (PK) and Description Now, I want to set things up so that Table 1.Type is of type Table 2.A. 1) I guess in SQL lingo, what I'm trying to say is that Table 1.Type is a FK to Table 2.A. Is that correct terminology? Is that backwards? It appears to me to be correct. 2) So I ...

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• Does a large (hidden) submenu count towards site content in tems of determining page similarities?

  - by Name

  Basically, I have this site that recently lost a lot of traffic after I optimized the html, the exact reasons to which are uncertain. The graph of impressions (times a page appears on search listings) is continuously going down like an e^-x function. Because the content, previously occupying five pages of tables, now fits within a few paragraph tags, the menu now occupies about 80% of the live html code and I am starting to have doubts wherether this affects the "similar pages" factor that Google punishes. Questions: As far as I know, Google ignores invisible material and the submenus are only visible when hovered over. Has anything at all changed in this area? If I ajax in the submenus, leaving only the main eight menu items to load, will I be punished for "hiding" information? Is the idea worth testing or is it frankly retarded?

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• Q: Is it me or is ADO.NET **BACKWARDS**? (20 replies)

  To simplify the question, I create 2 tables in SQL. Table 1 has columns: ColumnA (PK), ColumnB and Type. Table 2 has columns: A (PK) and Description Now, I want to set things up so that Table 1.Type is of type Table 2.A. 1) I guess in SQL lingo, what I'm trying to say is that Table 1.Type is a FK to Table 2.A. Is that correct terminology? Is that backwards? It appears to me to be correct. 2) So I ...

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