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• Oracle Linux Hands-on Lab from your Home? Yes You Can Do That!

  - by Zeynep Koch

  We're taking the very popular OTN Sysadmin Days and going virtual! We have two days to choose from: Americas - Tuesday January 15th, 2013 9:00 a.m – 1:00 p.m. PT / 12:00 p.m. – 4:00 p.m. ET / 1:00 p.m. - 5:00 p.m. BRT EMEA -  Tuesday January 29th, 2013 - 9:00 a.m – 13:00 p.m GMT / 10:00 a.m – 14:00 p,m CET / 12:00 p.m – 16:00 p.m AST / 13:00 p.m – 17:00 p,m MSK / 14:30 p.m – 18:30 p.m IST You'll be able to perform real-world tasks with Oracle Linux and if you have questions you can ask for help from the Oracle experts through chat window. There's one caveat: you'll have to do a little homework ahead of time. Load the virtual images onto your laptop, find the instructions, and make sure everything is working properly. This wiki https://wikis.oracle.com/display/virtualsysadminday/Home explains what you need to do. If you have questions, ask them as comments to the wiki:https://wikis.oracle.com/display/virtualsysadminday/Home.  Oracle Linux Track  1. Oracle Linux Technology Overview - In this session we will go over the latest Oracle Linux features including tools for Linux administration such as the Unbreakable Linux Network (ULN) and public yum. We will also show you a demo of Ksplice zero downtime kernel updates, only available to Oracle Linux customers. You will see how easy it is to switch from Red Hat support to Oracle Linux support by using ULN. Last but not least, we’ll introduce the 3 hands-on labs that will follow this session in the Linux track. 2. HOL: Package Management -  In this lab session you will use the package management on Oracle Linux using RPM and yum. Some of the tasks that you will experience include listing installed packages, obtaining additional information about packages, searching for packages and installing/updating them as well as verifying package integrity and removing software. We’ll also review Linux services and run levels, how to start and stop them, checking the status of a particular service and enabling a service to be started automatically at system boot. 3. HOL: Storage Management - In this hands-on lab session, you will learn about storage management with LVM2, the Linux Logical Volume Manager, preparing block devices, creating physical and logical volumes, creating file systems on top of logical volumes, and resizing file systems dynamically. You will also practice setting up software RAID devices, configuring encrypted block devices.Btrfs File System - In this hands-on lab session, we will introduce you to Btrfs file system. You will be able to create and mount a Btrfs file system and learn to setup a mirrored/striped file system across multiple block devices. You’ll also learn how to add and remove block devices, and create file system snapshots. Register for this FREE event.

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• Combobox binding with different types

  - by George Evjen

  Binding to comboboxes in Silverlight has been an adventure the past couple of days. In our framework at ArchitectNow we use LookupGroups and LookupValues. In our database we would have a LookupGroup of NBA Teams for example. The group would be called NBATeams, we get the LookupGroupID and then get the values from the LookupValues table. So we would end up with a list of all 30+ teams. Our lookup values entity has a display text(string), value(string), IsActive and some other fields. With our applications we load all this information into the system when the user is logging in or right after they login. So in cache we have a list of groups and values that we can get at whenever we want to. We get this information in our framework simply by creating an observable collection of type LookupValue. To get a list of these values into our property all we have to do is. var NBATeams = AppContext.Current.LookupSerivce.GetLookupValues(“NBATeams”); Our combobox then is bound like this. (We use telerik components in most if not all our projects) <telerik:RadComboBox ItemsSource="{Binding NBATeams}”></telerik:RadComboBox> This should give you a list in your combobox. We also set up another property in our ViewModel that is a just single object of NBATeams  - “SelectedNBATeam” Our selectedItem in our combobox would look like, we would set this to a two way binding since we are sending data back. SelectedItem={Binding SelectedNBATeam, mode=TwoWay}” This is all pretty straight forward and we use this pattern throughout all our applications. What do you do though when you have a combobox in a ItemsControl or ListBox? Here we have a list of NBA Teams that are a string that are being brought back from the database. We cant have the selected item be our LookupValue because the data is a string and its being bound in an ItemsControl. In the example above we would just have the combobox in a form. Here though we have it in a ItemsControl, where there is no selected item from the initial ItemsSource. In order to get the selected item to be displayed in the combobox you have to convert the LookupValue to a string. Then instead of using SelectedItem in the combobox use SelectedValue. To convert the LookupValue we do this. Create an observable collection of strings public ObservableCollection<string> NBATeams { get; set;} Then convert your lookups to strings var NBATeams = new ObservableCollection<string>(AppContext.Current.LookupService.GetLookupValues(“NBATeams”).Select(x => x.DisplayText)); This will give us a list of strings and our selected value should be bound to the NBATeams property in our ItemsSource in our ItemsControl. SelectedValue={Binding NBATeam, mode=TwoWay}”

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• Backup Compression - time for an overhaul

  - by jchang

  Database backup compression is incredibly useful and valuable. This became popular with then Imceda (later Quest and now Dell) LiteSpeed. SQL Server version 2008 added backup compression for Enterprise Edition only. The SQL Server EE native backup feature only allows a single compression algorithm, one that elects for CPU efficiency over the degree of compression achieved. In the long ago past, this strategy was essential. But today the benefits are irrelevant while the lower compression is becoming...(read more)

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• DeveelDB

  - by csharp-source.net

  DeveelDB is a full embeddedable SQL database management system for .NET and Mono frameworks, managing small to large amount of data with a wide support for complex types. Some of the key features of this project are: - the strong transactional system for isolated operations an efficient memory management to reduce the impact on the runtime - its open architecture, to permit development of modules and features - a small footprint: the core library is ~1Mb

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• GlynnTucker.Cache

  - by csharp-source.net

  The GlynnTucker.Cache assembly provides a data structure for caching slow data retrievals, for example data retrieved from a database server over the network. Think of it as a Hashtable that can automatically expire its data after a set amount of time or a specified period of inactivity, on a per-object basis. It is written in C# and dual licensed under the GPL/MPL, it should work with any .NET language.

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• Efficient SQL Server Indexing by Design

  Having a good set of indexes on your SQL Server database is critical to performance. Efficient indexes don't happen by accident; they are designed to be efficient. Greg Larsen discusses whether primary keys should be clustered, when to use filtered indexes and what to consider when using the Fill Factor.

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• Oracle Magazine, January/February 2010

  Oracle Magazine January/February features articles on the evolution of enterprise architecture, customer acquisition and retention with Oracle CRM On Demand, Oracle awards for 2009, task flow routers, privacy and security, Oracle Essbase, compressing with Oracle Exadata Hybrid Columnar Compression, Tom Kyte on Oracle Database 11g Release 2 and much more.

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• New free SQL Azure offer

  - by John Paul Cook

  Microsoft has a new and better way to get a free Azure account for a month. All you need to do to sign up is provide your Windows Live Id and register at http://bit.ly/CRAzurePass using promotional code DPCE01 . This is a great way to learn about SQL Azure and improve your skills. You might be interested in downloading the SQL Azure version of the AdventureWorks database from Codeplex ....(read more)

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• A WaspKiller Game with Silverlight 3, .NET RIA Services, MVP and MVVM Patterns Part 1

  In this article, we will focus upon the development of the front end of the game using the MVP pattern; in the second part, we will discuss the database related work using the MVVM pattern.

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• Stairway to T-SQL DML Level 5: The Mathematics of SQL: Part 2

  Joining tables is a crucial concept to understanding data relationships in a relational database. When you are working with your SQL Server data, you will often need to join tables to produce the results your application requires. Having a good understanding of set theory, and the mathematical operators available and how they are used to join tables will make it easier for you to retrieve the data you need from SQL Server.

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• Many-to-many relationships in pharmacology

  - by John Paul Cook

  When I was in my pharmacology class this morning, I realized that the instructor was presenting a classic relational database management system problem: the many-to-many relationship. He said that all of us in nursing school must know our drugs backwards and forwards. I know how to model that! There are so many things in both healthcare and higher education that could benefit from an appropriate application of technology. As a student, I'd like to be able to start with a drug, a disease, a name of...(read more)

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• Last chance for a day of free SQL Server training at SQL in the City 2012

  SQL Server developers and database administrators have one last chance for a full day of free training and networking at SQL in the City 2012. NEW! Deployment Manager Early Access ReleaseDeploy SQL Server changes and .NET applications fast, frequently, and without fuss, using Deployment Manager, the new tool from Red Gate. Try the Early Access Release to get a 20% discount on Version 1. Download the Early Access Release.

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• Windows Azure Training Kit &ndash; August 2012 Released

  - by Clint Edmonson

  In this release of the training kit we have delivered 41 HOLs covering a wide variety of bug fixes and screen shot updates for Visual Studio 2012. We now have 35 Presentations with new content surrounding Windows Azure SQL Database, SQL Federation, Reporting and Data Sync (4) as well as Security & Identity (1); and Building Scalable, Global, and Highly Available Web Apps (1). Head over to http://aka.ms/WATK and download it now!

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• SSIS Basics: Setting Up Your Initial Package

  Up until now, it has been a curiously frustrating search to find out the basics of SSIS, fast, in order to get up and running quickly. No longer, as Annette Allen comes up with a simple introduction for the rest of us. What are your servers really trying to tell you? Find out with new SQL Monitor 3.0, an easy-to-use tool built for no-nonsense database professionals.For effortless insights into SQL Server, download a free trial today.

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• Connection Strings, an Overview

  We asked Phil to come up with a simple explanation of connection strings. We somehow weren't expecting a 'quote of the day' for your database, or a C# application to gather data from the internet. However, sometimes the oblique approach is the best, especially when the knowledge comes from hard-won experience by a cynical man.

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• Using Solid State Drives for Enterprise Storage

  SSDs can improve database and file system performance, but there are a number of issues that need to be addressed to make the most of the pricey drives.

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• Oracle Magazine, January/February 2009

  Oracle Magazine January/February features articles on Oracle Exadata, Oracle grid infrastructure, Oracle embedded databases, Oracle WebLogic Server, encrypting Tablespacess, managing database resources, Tom Kyte on Dynamic Sampling, easier interactive data entry, coding PL/SQL, tips on Oracle Application Express and much more.

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• Calling exceptional DBAs: step up and be recognized

  Nominations for The Exceptional DBA of 2010 open today, giving database administrators around the world the chance to be recognized for service to their employers, the SQL Server community, and the IT industry at large.

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• How granular should a command be in a CQ[R]S model?

  - by Aaronaught

  I'm considering a project to migrate part of our WCF-based SOA over to a service bus model (probably nServiceBus) and using some basic pub-sub to achieve Command-Query Separation. I'm not new to SOA, or even to service bus models, but I confess that until recently my concept of "separation" was limited to run-of-the-mill database mirroring and replication. Still, I'm attracted to the idea because it seems to provide all the benefits of an eventually-consistent system while sidestepping many of the obvious drawbacks (most notably the lack of proper transactional support). I've read a lot on the subject from Udi Dahan who is basically the guru on ESB architectures (at least in the Microsoft world), but one thing he says really puzzles me: As we get larger entities with more fields on them, we also get more actors working with those same entities, and the higher the likelihood that something will touch some attribute of them at any given time, increasing the number of concurrency conflicts. [...] A core element of CQRS is rethinking the design of the user interface to enable us to capture our users’ intent such that making a customer preferred is a different unit of work for the user than indicating that the customer has moved or that they’ve gotten married. Using an Excel-like UI for data changes doesn’t capture intent, as we saw above. -- Udi Dahan, Clarified CQRS From the perspective described in the quotation, it's hard to argue with that logic. But it seems to go against the grain with respect to SOAs. An SOA (and really services in general) are supposed to deal with coarse-grained messages so as to minimize network chatter - among many other benefits. I realize that network chatter is less of an issue when you've got highly-distributed systems with good message queuing and none of the baggage of RPC, but it doesn't seem wise to dismiss the issue entirely. Udi almost seems to be saying that every attribute change (i.e. field update) ought to be its own command, which is hard to imagine in the context of one user potentially updating hundreds or thousands of combined entities and attributes as it often is with a traditional web service. One batch update in SQL Server may take a fraction of a second given a good highly-parameterized query, table-valued parameter or bulk insert to a staging table; processing all of these updates one at a time is slow, slow, slow, and OLTP database hardware is the most expensive of all to scale up/out. Is there some way to reconcile these competing concerns? Am I thinking about it the wrong way? Does this problem have a well-known solution in the CQS/ESB world? If not, then how does one decide what the "right level" of granularity in a Command should be? Is there some "standard" one can use as a starting point - sort of like 3NF in databases - and only deviate when careful profiling suggests a potentially significant performance benefit? Or is this possibly one of those things that, despite several strong opinions being expressed by various experts, is really just a matter of opinion?

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• A solution for a PHP website without a framework

  - by lortabac

  One of our customers asked us to add some dynamic functionality to an existent website, made of several static HTML pages. We normally work with an MVC framework (mostly CodeIgniter), but in this case moving everything to a framework would require too much time. Since it is not a big project, not having the full functionality of a framework is not a problem. But the question is how to keep code clean. The solution I came up with is to divide code in libraries (the application's API) and models. So inside HTML there will only be API calls, and readability will not be sacrificed. I implemented this with a sort of static Registry (sorry if I'm wrong, I am not a design pattern expert): <?php class Custom_framework { //Global database instance private static $db; //Registered models private static $models = array(); //Registered libraries private static $libraries = array(); //Returns a database class instance static public function get_db(){ if(isset(self::$db)){ //If instance exists, returns it return self::$db; } else { //If instance doesn't exists, creates it self::$db = new DB; return self::$db; } } //Returns a model instance static public function get_model($model_name){ if(isset(self::$models[$model_name])){ //If instance exists, returns it return self::$models[$model_name]; } else { //If instance doesn't exists, creates it if(is_file(ROOT_DIR . 'application/models/' . $model_name . '.php')){ include_once ROOT_DIR . 'application/models/' . $model_name . '.php'; self::$models[$model_name] = new $model_name; return self::$models[$model_name]; } else { return FALSE; } } } //Returns a library instance static public function get_library($library_name){ if(isset(self::$libraries[$library_name])){ //If instance exists, returns it return self::$libraries[$library_name]; } else { //If instance doesn't exists, creates it if(is_file(ROOT_DIR . 'application/libraries/' . $library_name . '.php')){ include_once ROOT_DIR . 'application/libraries/' . $library_name . '.php'; self::$libraries[$library_name] = new $library_name; return self::$libraries[$library_name]; } else { return FALSE; } } } } Inside HTML, API methods are accessed like this: <?php echo Custom_framework::get_library('My_library')->my_method(); ?> It looks to me as a practical solution. But I wonder what its drawbacks are, and what the possible alternatives.

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• Good way to manage blog/news? [closed]

  - by DavidScherer

  I really don't want to undertake handling blog/news posts within a site I'm working on and would much rather use some other software that's fairly bare-bones that will manage the posts and then I can just pull posts from the DB or an API. Does anyone have any experience with a nice, lightweight OS Blog type software that has either an API or is basic enough to simply pull Data from the database? I really only need the software for managing, I plan to display all the posts programatically through MVC.

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• Celko's SQL Stumper: Eggs in one Basket

  Joe Celko returns with another stumper to celebrate Easter. Unsurprisingly, this involves eggs. More surprising is the nature of the puzzle: This time, the puzzle is one of designing a database rather than a query. DDL as well as the DML.

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• WebCenter Customer Spotlight: Sberbank of Russia

  - by me

  Author: Peter Reiser - Social Business Evangelist, Oracle WebCenter  Solution SummarySberbank of Russia is the largest credit institution in Russia and the Commonwealth of Independent States (CIS), accounting for 27% of Russian banking assets and 26% of Russian banking capital.Sberbank of Russia needed to increase business efficiency and employee productivity due to the growth in its corporate clientele from 1.2 million to an estimated 1.6 million.Sberbank of Russia deployed Oracle’s Siebel Customer Relationship Management (CRM) applications to create a single client view, optimize client communication, improve efficiency, and automate distressed asset processing. Based on Oracle WebCenter Content, they implemented an enterprise content management system for documents, unstructured content storage and search, which became an indispensable service across the organization and in the board room business results. Sberbank of Russia consolidated borrower information across the entire organization into a single repository to obtain, for the first time, a single view on the bank’s borrowers. With the implemented solution they reducing the amount of bad debt significantly. Company OverviewSberbank of Russia is the largest credit institution in Russia and the Commonwealth of Independent States (CIS), accounting for 27% of Russian banking assets and 26% of Russian banking capital. In 2010, it ranked 43rd in the world for Tier 1 capital. Business ChallengesSberbank of Russia needed to increase business efficiency and employee productivity due to the growth in its corporate clientele from 1.2 million to an estimated 1.6 million. It also wanted to automate distressed asset management to reduce the number of corporate clients’ bad debts. As part of their business strategy they wanted to drive high-quality, competitive customer services by simplifying client communication processes and enabling personnel to quickly access client information Solution deployedSberbank of Russia deployed Oracle’s Siebel Customer Relationship Management (CRM) applications to create a single client view, optimize client communication, improve efficiency, and automate distressed asset processing. Based on Oracle WebCenter Content, they implemented an enterprise content management system for documents, unstructured content storage and search which became an indispensable service across the organization and in the board room business results. Business ResultsSberbank of Russia consolidated borrower information across the entire organization into a single repository to obtain, for the first time, a single view on the bank’s borrowers. They monitored 103,000 client transactions and 32,000 bank cards with credit collection issues (100% of Sberbank’s bad borrowers) reducing the amount of bad debt significantly. “Innovation and client service are the foundation of our business strategy. Oracle’s Siebel CRM applications helped advance our objectives by enabling us to deliver faster, more personalized service while managing and tracking distressed assets.” A.B. Sokolov, Head of Center of Business Administration and Customer Relationship Management, Sberbank of Russia Additional Information Sberbank of Russia Customer Snapshot Oracle WebCenter Content Siebel Customer Relationship Management 8.1 Oracle Business Intelligence, Enterprise Edition 11g

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• Architecture for a site "blog"/"news reel"

  - by DavidScherer

  I really don't want to undertake handling blog/news posts within a site I'm working on and would much rather use some other software that's fairly bare-bones that will manage the posts and then I can just pull posts from the DB or an API. Does anyone have any experience with a nice, lightweight OS Blog type software that has either an API or is basic enough to simply pull Data from the database? I really only need the software for managing, I plan to display all the posts programatically through MVC.

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• Strategy to use two different measurement systems in software

  - by Dennis

  I have an application that needs to accept and output values in both US Custom Units and Metric system. Right now the conversion and input and output is a mess. You can only enter in US system, but you can choose the output to be US or Metric, and the code to do the conversions is everywhere. So I want to organize this and put together some simple rules. So I came up with this: Rules user can enter values in either US or Metric, and User Interface will take care of marking this properly All units internally will be stored as US, since the majority of the system already has most of the data stored like that and depends on this. It shouldn't matter I suppose as long as you don't mix unit. All output will be in US or Metric, depending on user selection/choice/preference. In theory this sounds great and seems like a solution. However, one little problem I came across is this: There is some data stored in code or in the database that already returns data like this: 4 x 13/16" screws, which means "four times screws". I need the to be in either US or Metric. Where exactly do I put the conversion code for doing the conversion for this unit? The above already mixing presentation and data, but the data for the field I need to populate is that whole string. I can certainly split it up into the number 4, the 13/16", and the " x " and the " screws", but the question remains... where do I put the conversion code? Different Locations for Conversion Routines 1) Right now the string is in a class where it's produced. I can put conversion code right into that class and it may be a good solution. Except then, I want to be consistent so I will be putting conversion procedures everywhere in the code at-data-source, or right after reading it from the database. The problem though is I think that my code will have to deal with two systems, all throughout the codebase after this, should I do this. 2) According to the rules, my idea was to put it in the view script, aka last change to modify it before it is shown to the user. And it may be the right thing to do, but then it strikes me it may not always be the best solution. (First, it complicates the view script a tad, second, I need to do more work on the data side to split things up more, or do extra parsing, such as in my case above). 3) Another solution is to do this somewhere in the data prep step before the view, aka somewhere in the middle, before the view, but after the data-source. This strikes me as messy and that could be the reason why my codebase is in such a mess right now. It seems that there is no best solution. What do I do?

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