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  • Amazon SOA: database as a Service

    - by Martin Lee
    There is an interesting interview with Werner Vogels which is partly about how Amazon does Service Oriented Architecture: For us service orientation means encapsulating the data with the business logic that operates on the data, with the only access through a published service interface. No direct database access is allowed from outside the service, and there’s no data sharing among the services. I do not understand that. Why do they need to 'wrap' a database into some layer if it already can be consumed as a service by other service through database adaptors? Does Amazon do that just because they need to expose the database to third parties or because of anything else? Why "no direct database access is allowed"? What are the advantages of such an architectural decision?

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  • Cumulative Update #7 for SQL Server 2008 Service Pack 3 is available

    - by AaronBertrand
    Today Microsoft has released a new cumulative update for SQL Server 2008. Cumulative Update #7 for SQL Server 2008 Service Pack 3 Knowledge Base Article: KB #2738350 At the time of writing, there are 9 fixes listed The build number is 10.00.5794 Relevant for @@VERSION between 10.00.5500 and 10.00.5793 No word yet on an update for Service Pack 2. As usual, I'll post my standard disclaimer here: these updates are NOT for SQL Server 2008 R2 (where @@VERSION will report 10.50.xxxx)....(read more)

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  • Best C# database communication technique

    - by user65439
    A few days ago I read a reply to a question where people said that the days of writing queries within your c# code are long gone. I'm not sure what the specific person meant with the comment but it got me thinking. At the company I'm currently working at we maintain an assembly containing all the queries to the database (let's call it Queries), this assembly is reference by a QueryService (Retrieve the correct queries) assembly which in turn is referenced by a UnitOfWork assembly (The database connector classes, we have different connector classes for SQL, MySQL etc.). We use these three assemblies to perform operations on our database and all queries/commands are written in our C# code. Is there a better way to communicate with the database and is there a better way to communicate with different database types?

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  • When should we use weak entities when modelling a database?

    - by Songo
    This is basically a question about what are weak entities? When should we use them? How should they be modeled? What is the main difference between normal entities and weak entities? Does weak entities correspond to value objects when doing Domain Driven Design? To help keep the question on topic here is an example taken from Wikipedia that people can use to answer these question: In this example OrderItem was modeled as a weak entity, but I can't understand why it can't be modeled as a normal entity. Another question is what if I want to track the order history (i.e. the changes in it status) would that be a normal or weak entity?

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  • Single database, multiple system dependency

    - by davenewza
    Consider an environment where we have a single, core database, with many separate systems using this one database. This leads to all of these systems have a common dependency, which ultimately introduces coupling between them. This means that we cannot always evolve systems independently of each other. Structural changes to the database (even if only intended for one, particular system), requires a full sweep test of ALL systems, and may require that other systems be 'patched' and subsequently released. This is especially tricky when you want to have separate teams working on different projects. What is a good 'pattern' to help in avoiding such coupling? I would imagine that a database should be exclusively depended on by one system. If other systems require data for whatever reason, they should request such from an API service of some kind. A drawback of this approach which comes to mind is performance: routing data between high-throughput systems through service calls is much slower than through a database connection.

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  • SQL Rank

    - by Derek Dieter
    The SQL Rank function was introduced in SQL Server 2005 and is part of a family of ranking functions. In order to explain the SQL Rank function, we need to look at it in context with the other rank functions.RANK DENSE_RANK ROW_NUMBER NTILEThis list may seem overwhelming, however most of the ranking functions are rather similar. First, the [...]

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  • Execute a SSIS package in Sync or Async mode from SQL Server 2012

    - by Davide Mauri
    Today I had to schedule a package stored in the shiny new SSIS Catalog store that can be enabled with SQL Server 2012. (http://msdn.microsoft.com/en-us/library/hh479588(v=SQL.110).aspx) Once your packages are stored here, they will be executed using the new stored procedures created for this purpose. This is the script that will get executed if you try to execute your packages right from management studio or through a SQL Server Agent job, will be similar to the following: Declare @execution_id bigint EXEC [SSISDB].[catalog].[create_execution] @package_name='my_package.dtsx', @execution_id=@execution_id OUTPUT, @folder_name=N'BI', @project_name=N'DWH', @use32bitruntime=False, @reference_id=Null Select @execution_id DECLARE @var0 smallint = 1 EXEC [SSISDB].[catalog].[set_execution_parameter_value] @execution_id,  @object_type=50, @parameter_name=N'LOGGING_LEVEL', @parameter_value=@var0 DECLARE @var1 bit = 0 EXEC [SSISDB].[catalog].[set_execution_parameter_value] @execution_id,  @object_type=50, @parameter_name=N'DUMP_ON_ERROR', @parameter_value=@var1 EXEC [SSISDB].[catalog].[start_execution] @execution_id GO The problem here is that the procedure will simply start the execution of the package and will return as soon as the package as been started…thus giving you the opportunity to execute packages asynchrously from your T-SQL code. This is just *great*, but what happens if I what to execute a package and WAIT for it to finish (and thus having a synchronous execution of it)? You have to be sure that you add the “SYNCHRONIZED” parameter to the package execution. Before the start_execution procedure: exec [SSISDB].[catalog].[set_execution_parameter_value] @execution_id,  @object_type=50, @parameter_name=N'SYNCHRONIZED', @parameter_value=1 And that’s it . PS From the RC0, the SYNCHRONIZED parameter is automatically added each time you schedule a package execution through the SQL Server Agent. If you’re using an external scheduler, just keep this post in mind .

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  • Small-scale database options for .NET

    - by raney
    I have a .NET 4.0/WPF based application I've developed and maintain for my company that acts as a friendly GUI central-point-of-information, combining information pulled from a couple of SQL databases, as well as CSV exports from a few other applications. I would like to build out my own database to support the entirety of the information that the application accesses, so that I could have a service running on my server that would read in necessary remote SQL info and file exports, to provide the user's application with a single database to connect to, as well as to remove all of the file handling currently involved in the program (copying new CSV resources from network location, reading them into memory each launch.) I have complete control and flexibility here as long as the user's experience isn't affected, and this is as much a learning experience as it is tidying up. Caveat being, I don't have much in the way of a budget. Right now I recognize my options to be: SQL Express - I'm comfortable with the server setup, I like ADO.NET and LINQ to SQL. I feel that I have the least to learn here, but it would let me focus on SQL in a familiar environment. Perhaps in conjunction with Entity Framework? MongoDB - I don't know a whole lot about, but I've heard the name enough to make me curious. Brief research seems friendly enough, and there is .NET support. I like working with open source projects. My questions are: What's popular and extensible right now? I'm not far from starting to job-hunt, and I'd like this project to be relevant going forward. What am I missing? Pros, cons? Other options? What plays well with .NET? What are the things I should be considering, the questions I should be asking, when making a decision like this? Thanks for your time.

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  • December 2012 Cumulative Updates are available for SQL Server 2008 R2

    - by AaronBertrand
    Microsoft released new cumulative updates for SQL Server. SQL Server 2008 R2 Service Pack 1 Cumulative Update # 10 KB Article: KB #2783135 16 fixes are listed at the time of publication Build number is 10.50.2868 Relevant for @@VERSION 10.50.2500 through 10.50.2867 SQL Server 2008 R2 Service Pack 2 Cumulative Update # 4 KB Article: KB #2777358 34 fixes are listed at time of publication Build number is 10.50.4270 Relevant for @@VERSION 10.50.4000 through 10.50.4269 My usual disclaimer: these updates...(read more)

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  • Migrate Sql Server 2000. Which is better, 2005 vs 2008?

    - by Jhonny D. Cano -Leftware-
    My company has a Server with Windows Server 2003, and SQL Server 2000. We are planning to migrate just the database server, a provider said us the migration would be better to 2005 first, and then to 2008, because "the SQL Server 2008 is best suited for Windows Server 2008". Which are the pros and cons of each of these approaches? Migrate SQL 2000 to SQL 2005 and then to SQL 2008 Migrate SQL 2000 directly to SQL 2008 NOTE: Changing Operating System is not an option ($$$) right now for the company. Any article or experiences would be very much appreciated

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  • Microsoft Delivers Full Suite of SQL Server Powershell Cmdlets

    - by merrillaldrich
    We’ve all been waiting several years for this, and finally it’s here! Coinciding (approximately) with the release of SQL Server 2012, a new Feature Pack has appeared on the Microsoft web site that adds a full suite of PowerShell cmdlets for DDL and other functions. This means that, at last, we can do things like fully-featured SQL deployment scripts without all the (severe) limitations of T-SQL, such as primitive use of variables, flow control, exception handling. Taking a cue, finally, from the...(read more)

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  • TechEd 2010 Followup

    - by AllenMWhite
    Last week I presented a couple of sessions at Tech Ed NA in New Orleans. It was a great experience, even though my demos didn't always work out as planned. Here are the sessions I presented: DAT01-INT Administrative Demo-Fest for SQL Server 2008 SQL Server 2008 provides a wealth of features aimed at the DBA. In this demofest of features we'll see ways to make administering SQL Server easier and faster such as Centralized Data Management, Performance Data Warehouse, Resource Governor, Backup Compression...(read more)

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  • Cumulative Update #5 is available for SQL Server 2012 RTM

    - by AaronBertrand
    Microsoft has released Cumulative Update #5 for SQL Server 2012 RTM. Note this is *not* a cumulative update for Service Pack 1. So if your build # is >= 11.0.3000, you should not be installing this update. KB Article: KB #2777772 Build # 11.0.2395 28 fixes at the time of writing Relevant for builds 11.0.2100 -> 11.0.3329. Do not attempt to install on SQL Server 2012 SP1 (any build >= 11.0.3000) or any previous version of SQL Server....(read more)

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  • 24 hours of PASS is back!

    - by Sergio Govoni
    The most important free on-line event on SQL Server and Business Intelligence is back! The 24 Hours of PASS is coming back with a great edition fully based on the new features of SQL Server 2014. What could you aspect from the next PASS Summit? Find it out on June 25, 2014 (12:00 GMT) on 24 Hours of PASS: SQL Server 2014! Register now at this link. No matter from what part of the world you will follow the event, the important thing is to know that it will be 24 hours of continuous training on SQL Server and Business Intelligence.

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  • T-SQL Tuesday #007 and T-SQL Tuesday Has a Logo

    - by Adam Machanic
    This month’s T-SQL Tuesday is hosted by Jorge Segarra, the “SQL Chicken.” The topic is rather open ended: What is your favorite new(ish) SQL Server feature? Love the DACPAC? Can’t wait for PDW? Post about it and tell us why! In other T-SQL Tuesday news, we now have a logo. Those of you who are participating in the event, take notice; the rules have changed. Now that we have a logo we’re simplifying the linkback and subject guidelines a bit. Henceforth you can title your post however you want. It...(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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  • TechEd 2010 Followup

    - by AllenMWhite
    Last week I presented a couple of sessions at Tech Ed NA in New Orleans. It was a great experience, even though my demos didn't always work out as planned. Here are the sessions I presented: DAT01-INT Administrative Demo-Fest for SQL Server 2008 SQL Server 2008 provides a wealth of features aimed at the DBA. In this demofest of features we'll see ways to make administering SQL Server easier and faster such as Centralized Data Management, Performance Data Warehouse, Resource Governor, Backup Compression...(read more)

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  • SQL Date Comparison

    - by Derek Dieter
    When comparing the datetime datatype in SQL Server, it is important to maintain consistency in order to gaurd against SQL interpreting a date differently than you intend. In at least one occasion I have seen someone specify a short format for a date, like (1/4/08) only to find that SQL interpreted the month as [...]

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  • Simple way to create a SQL Server Job Using T-SQL

    Sometimes we have a T-SQL process that we need to run that takes some time to run or we want to run it during idle time on the server. We could create a SQL Agent job manually, but is there any simple way to create a scheduled job? The seven tools in the SQL DBA Bundle support your core SQL Server database administration tasks.Make backups a breeze! Enjoy trouble-free troubleshooting! Make the most of monitoring! Download a free trial now.

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  • SQL Server 2008 SP3 and HP Database Enterprise Appliance

    The list of updated features begins with an overall improved upgrading experience from SQL Server's older versions to the latest SQL Server 2008 SP3 edition. Microsoft has implemented measures that provide enhanced performance and reliability while making the upgrade as well. Logs in SQL Server Integration Services will display the aggregate number of rows transmitted in Data Flows, and enabling the Shrink Database option will produce enhanced warning messages when maintenance plan development takes place. Microsoft's blog post continues with the list of SP3 upgrades, noting that users sho...

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  • Stairway to SQL PowerShell Level 4: Objects in SQL PowerShell

    This far, we have learned about installation and setup of the PowerShell environment. You should now have a foundation of SQL Server PowerShell. We now are ready to learn about Objects in SQL PowerShell. Schedule Azure backupsRed Gate’s Cloud Services makes it simple to create and schedule backups of your SQL Azure databases to Azure blob storage or Amazon S3. Try it for free today.

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  • Speaking - SQL Saturday 173, Washington DC

    - by AllenMWhite
    After a great time at the PASS Summit in Seattle I'll be once again presenting on PowerShell for SQL Server at SQL Saturday #173 in Chevy Chase, Maryland. On Friday, December 7 I'll be presenting my full day session Automate and Manage SQL Server with PowerShell . Here's the abstract: This soup-to-nuts all day session will first introduce you to PowerShell, after which you'll learn the basic SMO object model, how to manipulate data with PowerShell and how to use SMO to manage objects. We'll then...(read more)

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  • T-SQL Tuesday #34: HELP!

    - by merrillaldrich
    I owe my career to the SQL Server community, specifically the Internet SQL Server community, so this month’s T-SQL Tuesday is especially poignant. I changed careers “cold” about eight years ago, and, while I had some educational background in computer science, I had relatively little real-world DBA experience. Someone gave me a shot in the form of an entry level job, for which I am grateful, but I also had to make the argument to him that I would figure out whatever I needed to do to be successful...(read more)

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  • T-SQL Tuesday #015:Remaining on Alert

    - by AllenMWhite
    This T-SQL Tuesday is about Automation in SQL Server, and I'll bet you think I'm going to talk about PowerShell. Well, you're partially right. What I'd like to talk about today, though, is setting up alerts to automate some responses to naturally occuring phenomena on your SQL Servers. (Note: I first introduced this technique in an article on Simple Talk here ). Without going back to the original article, I'm talking about a safety valve process for when your transaction logs start to fill at rates...(read more)

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