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  • SQLU Professional Development Week: The Difference Between Your Business and Community Presence

    - by andyleonard
    Introduction Proto-earth , dinosaurs , and the days when your personal and business profiles were separate and distinct. What do these things all have in common? They are all in the past. Background Checks Corporate background checks now routinely include a search for social media profiles, forum posts, and blogs. As professionals are learning, the things you say and do in your "off-work hours" can and will be used against you - even after you're hired and have been doing the job awhile . One point?...(read more)

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  • Analyzing the errorlog

    - by TiborKaraszi
    How often do you do this? Look over each message (type) in the errorlog file and determine whether this is something you want to act on. Sure, some (but not all) of you have some monitoring solution in place, but are you 100% confident that it really will notify for all messages that you might find interesting? That there isn't even one little message hiding in there that you would find valuable knowing about? Or how about messages that you typically don't are about, but knowing that you have a high...(read more)

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  • Utility Queries–Database Files, (and Filegroups)

    - by drsql
    It has been a while since I last posted a utility query, and today, to avoid other work I am supposed to be doing, I decided to go ahead and work on another post.  Today, I went ahead and worked on a server configuration type query. One query I find I use pretty often is the following one that lists the files in the database. In this blog I will include 3 queries.  The first will deal with files and databases, and the second runs in a database to see the files and their filegroups (If there...(read more)

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  • Bleeding Edge 2012 – session material

    - by Hugo Kornelis
    As promised, here are the slide deck and demo code I used for my presentation at the Bleeding Edge 2012 conference in Laško, Slovenia. Okay, I promised to have them up by Tuesday or Wednesday at worst, and it is now Saturday – my apologies for the delay. Thanks again to all the attendees of my session. I hope you enjoyed it, and if you have any question then please don’t hesitate to get in touch with me. I had a great time in Slovenia, both during the event and in the after hours. Even if everything...(read more)

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  • Managing multiple customer databases in ASP.NET MVC application

    - by Robert Harvey
    I am building an application that requires separate SQL Server databases for each customer. To achieve this, I need to be able to create a new customer folder, put a copy of a prototype database in the folder, change the name of the database, and attach it as a new "database instance" to SQL Server. The prototype database contains all of the required table, field and index definitions, but no data records. I will be using SMO to manage attaching, detaching and renaming the databases. In the process of creating the prototype database, I tried attaching a copy of the database (companion .MDF, .LDF pair) to SQL Server, using Sql Server Management Studio, and discovered that SSMS expects the database to reside in c:\program files\Microsoft SQL Server\MSSQL.1\MSSQL\DATA\MyDatabaseName.MDF Is this a "feature" of SQL Server? Is there a way to manage individual databases in separate directories? Or am I going to have to put all of the customer databases in the same directory? (I was hoping for a little better control than this). NOTE: I am currently using SQL Server Express, but for testing purposes only. The production database will be SQL Server 2008, Enterprise version. So "User Instances" are not an option.

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  • How do I programatically verify, create, and update SQL table structure?

    - by JYelton
    Scenario: I have an application (C#) that expects a SQL database and login, which are set by a user. Once connected, it checks for the existence of several table and creates them if not found. I'd like to expand on this by having the program be capable of adding columns to those tables if I release a new version of the program which relies upon the new columns. Question: What is the best way to programatically check the structure of an existing SQL table and create or update it to match an expected structure? I am planning to iterate through the list of required columns and alter the existing table whenever it does not contain the new column. I can't help but wonder if there's an approach that is different or better. Criteria: Here are some of my expectations and self-imposed rules: Newer versions of the program might no longer use certain columns, but they would be retained for data logging purposes. In other words, no columns will be removed. Existing data in the table must be preserved, so the table cannot simply be dropped and recreated. In all cases, newly added columns would allow null data, so the population of old records is taken care of by having default null values. Example: Here is a sample table (because visual examples help!): id sensor_name sensor_status x1 x2 x3 x4 1 na019 OK 0.01 0.21 1.41 1.22 Then, in a new version, I may want to add the column x5. The "x-columns" are all data-storage columns that accept null.

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  • Get the index value of an array in php

    - by Aakash Chakravarthy
    Hello, I have array $list = array('string1', 'string2', 'string3'); Now i want to get the index of the value string2 i.e 1 and 2 for string3 All i want is the position of the strings in the array string1 in 0 string2 in 1 string3 in 2 positions How to get this ? i used array_search but it is no use ! please help !

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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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  • DropdownList reset to to index 0 on load

    - by Andrew
    Hi, How would I reset my asp:DropDownList element (which has a runat="server") to index 0 every time the page is "reloaded" in firefox (F5 is pressed). If you suggest using javascript...please note that A: I am not using a form and B: I don't know how to access elements that have a runat="server" with javascript If this can be done using script on the .aspx page....please explain things you think an ASP newb would not know (ie. me, lol) thanks, Andrew :)

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  • A High Level Comparison Between Oracle and SQL Server

    Organisations often employ a number of database platforms in their information system architecture. It is not uncommon to see medium to large sized companies using three to four different RDBMS packages. Consequently the DBAs these companies look for often ... [Read Full Article]

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  • SQL Server 2005 - Enabling both Named Pipes & TCP/IP protocols?

    - by Clinemi
    We have a SQL Server 2005 database, and currently all our users are connecting to the database via the TCP/IP protocol. The SQL Server Configuration Manager allows you to "enable" both Named Pipes, and TCP/IP connections at the same time. Is this a good idea? My question is not whether we should use named pipes instead of TCP/IP, but are there problems associated with enabling both? One of our client's IT guys, says that enabling database communication with both protocols will limit the bandwidth that either protocol can use - to like 50% of the total. I would think that the bandwidth that TCP/IP could use would be directly tied (inversely) to the amount of traffic that Named Pipes (or any of the other types of traffic) were occupying on the network at that moment. However, this IT person is indicating that the fact that we have enabled two protocols on the server, artificially limits the bandwidth that TCP/IP can use. Is this correct? I did Google searches but could not come up with an answer to this question. Any help would be appreciated.

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  • SQL Lunch #19-Configuring, Deploying and Scheduling SSIS Packages

    May 10, 2010, 11:30CST. Now that you have created your SSIS packages it’s time to add some configuration files that will ease your deployments. Wait how do you deploy one or two or three SSIS packages? Uh oh, now that they are deployed how do you schedule them? Well join Patrick LeBlanc in his discussion on how to Configure, Deploy and Schedule your SSIS packages.

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  • Utility Queries–Database Files, (and Filegroups)

    - by drsql
    It has been a while since I last posted a utility query, and today, to avoid other work I am supposed to be doing, I decided to go ahead and work on another post.  Today, I went ahead and worked on a server configuration type query. One query I find I use pretty often is the following one that lists the files in the database. In this blog I will include 3 queries.  The first will deal with files and databases, and the second runs in a database to see the files and their filegroups (If there...(read more)

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  • SQLRally Nordic 2012 – session material

    - by Hugo Kornelis
    As some of you might know, I have been to SQLRally Nordic 2012 in Copenhagen earlier this week. I was able to attend many interesting sessions, I had a great time catching up with old friends and meeting new people, and I was allowed to present a session myself. I understand that the PowerPoint slides and demo code I used in my session will be made available through the SQLRally website – but I don’t know how long it will take the probably very busy volunteers to do so. And I promised my attendees...(read more)

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  • Android which button index from array was pressed

    - by Tim Wayne
    How do I set up a OnClickListener to simply tell me which index button was pressed from an array of buttons. I can change text and color of these buttons using the array. I set them up like this. TButton[1] = (Button)findViewById(R.id.Button01); TButton[2] = (Button)findViewById(R.id.Button02); TButton[3] = (Button)findViewById(R.id.Button03); up to 36.

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  • SQL Server 2008 R2: StreamInsight changes at RTM: Event Flow Debugger and Management Interface Secur

    - by Greg Low
    In CTP3, I found setting up the StreamInsight Event Flow Debugger fairly easy. For RTM, a number of security changes were made. First config: To be able to connect to the management interface, your user must be added to the Performance Log Users group. After you make this change, you must log off and log back on as the token is only added to your login token when you log on. I forgot this and spent ages trying to work out why I couldn't connect. Second config: You need to reserve the URL that the...(read more)

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  • How selective do we need to be for an index to be used?

    - by TiborKaraszi
    You know the answer already: It depends. But I often see some percentage value quoted and the point of this post is to show that there is no such percentage value. To get the most out of this blog post, you should understand the basic structure for an index, i.e. how the b+ tree look like. You should also understand the difference between a clustered and a non-clustered index. In essence, you should be able to visualize these structures and searches through them as you read the text. If you find...(read more)

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  • Maintaining SQL Server default trace historical events for analysis and reporting

    I often see questions online where someone wants to find out who started a trace, when tempdb last had an autogrow event, or when the last full backup for master occurred. Since these and other events are captured by the default trace, but the default trace only keeps five 20MB rollover files by default. This means that the event you are after may no longer be there, depending on how long ago it was and how busy your server happens to be. Unfortunately, people often need to find this information well after the fact.

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  • SQL Server: Writing CASE expressions properly when NULLs are involved

    - by Mladen Prajdic
    We’ve all written a CASE expression (yes, it’s an expression and not a statement) or two every now and then. But did you know there are actually 2 formats you can write the CASE expression in? This actually bit me when I was trying to add some new functionality to an old stored procedure. In some rare cases the stored procedure just didn’t work correctly. After a quick look it turned out to be a CASE expression problem when dealing with NULLS. In the first format we make simple “equals to” comparisons to a value: SELECT CASE <value> WHEN <equals this value> THEN <return this> WHEN <equals this value> THEN <return this> -- ... more WHEN's here ELSE <return this> END Second format is much more flexible since it allows for complex conditions. USE THIS ONE! SELECT CASE WHEN <value> <compared to> <value> THEN <return this> WHEN <value> <compared to> <value> THEN <return this> -- ... more WHEN's here ELSE <return this> END Now that we know both formats and you know which to use (the second one if that hasn’t been clear enough) here’s an example how the first format WILL make your evaluation logic WRONG. Run the following code for different values of @i. Just comment out any 2 out of 3 “SELECT @i =” statements. DECLARE @i INTSELECT  @i = -1 -- first resultSELECT  @i = 55 -- second resultSELECT  @i = NULL -- third resultSELECT @i AS OriginalValue, -- first CASE format. DON'T USE THIS! CASE @i WHEN -1 THEN '-1' WHEN NULL THEN 'We have a NULL!' ELSE 'We landed in ELSE' END AS DontUseThisCaseFormatValue, -- second CASE format. USE THIS! CASE WHEN @i = -1 THEN '-1' WHEN @i IS NULL THEN 'We have a NULL!' ELSE 'We landed in ELSE' END AS UseThisCaseFormatValue When the value of @i is –1 everything works as expected, since both formats go into the –1 WHEN branch. When the value of @i is 55 everything again works as expected, since both formats go into the ELSE branch. When the value of @i is NULL the problems become evident. The first format doesn’t go into the WHEN NULL branch because it makes an equality comparison between two NULLs. Because a NULL is an unknown value: NULL = NULL is false. That is why the first format goes into the ELSE Branch but the second format correctly handles the proper IS NULL comparison.   Please use the second more explicit format. Your future self will be very grateful to you when he doesn’t have to discover these kinds of bugs.

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  • Item index of Binding element

    - by vibeeshanRC
    I am creating a XAML / C# WinRT App and i have a collection of collection and i am binding it to a Grid-view(collections as groups ) Now i have to color the background of the GridViewItem according to their index in the collection (Dark color for the first one and light color for the last one ) How can i implement using a converter. (if there are 6 collections with 10 items all the first item will the dark and the 10 the item will be lighter). Simply: How can i send the item-index property to the converter as a parameter. My XAML <GridView x:Name="Grid1" ItemsSource="{Binding}" ItemTemplateSelector="{StaticResource templateSelector}" SelectionMode="None" > <GridView.ItemsPanel> <ItemsPanelTemplate> <VirtualizingStackPanel Orientation="Horizontal" VirtualizingStackPanel.VirtualizationMode="Recycling"/> </ItemsPanelTemplate> </GridView.ItemsPanel> <GridView.GroupStyle> <GroupStyle HidesIfEmpty="True"> <GroupStyle.HeaderTemplate> <DataTemplate> <Grid Margin="0,0,0,0"> <TextBlock Text='{Binding Name}' Margin="5" /> </Grid> </DataTemplate> </GroupStyle.HeaderTemplate> <GroupStyle.ContainerStyle> <Style TargetType="GroupItem" > <Setter Property="BorderThickness" Value="0"/> <Setter Property="Margin" Value="0,0"/> </Style> </GroupStyle.ContainerStyle> <GroupStyle.Panel> <ItemsPanelTemplate> <VariableSizedWrapGrid/> </ItemsPanelTemplate> </GroupStyle.Panel> </GroupStyle> </GridView.GroupStyle> </GridView> .......... <converters:MyConverter x:Key="templateSelector" Temp1="{StaticResource Temp1}" Temp2="{StaticResource Temp2}" > </converters:MyConverter> <DataTemplate x:Key="Temp1"> <Grid > <Grid> <Grid.Resources> <converters:PanelBackgroundColorConverter x:Name="panelBackgroundColorConverter" Key="{Binding}"/> <Grid.Resources/> <Grid.Background> <Binding Path="MPath" Converter="{StaticResource panelBackgroundColorConverter}" ConverterParameter="sym"/> </Grid.Background> <Grid/> <DataTemplate/>

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  • Simple Steps to Prepare Mirror Database for Mirroring in SQL Server

    To prepare a database for mirroring, you need to perform the following steps: Script the restore of the latest full database backup, script the restore of every transaction log backup that has been made after that full database backup, copy the full database backup and transaction log backups to the mirror server, and run the restore scripts on the mirror server. In this tip I will walk through these steps and provide sample scripts to prepare a database for mirroring.

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  • Utility Objects–Waitfor Delay Coordinator (SQL Server 2008+)

    - by drsql
    Finally… took longer than I had expected when I wrote this a while back, but I had to move my website and get DNS moved before I could post code… When I write code, I do my best to test that code in as many ways as necessary. One of the last types of tests that is necessary is concurrency testing. Concurrency testing is one of the most difficult types of testing because it takes running multiple processes simultaneously and making sure that you get the correct answers multiple times. This is really...(read more)

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