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  • A Perspective on Database Performance Tuning

    Fundamentally, database performance tuning is done for two basic reasons, to reduce response time and to reduce resource usage, both of which can apply for any given situation. Julian Stuhler looks at database performance tuning, and why it remains one of the most important topics for any DBA, developer or systems administrator.

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  • How to get current connection settings

    - by Peter Larsson
    SELECT name AS Setting,         CASE             WHEN @@OPTIONS & number = number THEN 'ON'             ELSE 'OFF'         END AS Value FROM    master..spt_values WHERE   type= 'SOP'         AND number > 0

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  • PowerPivot Workshop in London #ppws

    - by AlbertoFerrari
    As you might have read in Marco’s post , the PowerPivot Workshop I and Marco Russo have prepared is now starting its European tour. We will be in London on February 7,8 2011 and then touch most of the European countries during the next few months. We have provided the workshop first in Amsterdam and it has been a huge success, it is now time to start the roadshow and meet people who want to learn PowerPivot all over Europe: I am really excited about this! You will find updated information and workshop...(read more)

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  • Subscribable World Cup 2010 Calendar

    - by jamiet
    I bang on quite a lot on this blog about ways in which data can get published over the web and one of the most interesting ways, in my opinion, of publishing data in a structured manner that is well understood is to use the iCalendar specification. There isn’t much information in the world that doesn’t have some concept of “when” so iCalendar is a great way of distributing that information. You have probably used iCalendar at some point without even knowing about it. All files with a .ics suffix are iCalendar format files and that is why you can happily import them into Outlook, Hotmail Calendar, Google Calendar etc… where they can be parsed and have the semantic data (when, where and who) extracted from them. Importing of iCalendar format data is really only half the trick though; in my opinion the real value of iCalendar-formatted calendar is the ability to subscribe to them. Subscribing has a simple benefit over importing but that single benefit is of massive importance: a subscriber to an iCalendar calendar can periodically check to see if any updates have been made and, if they have, automatically update the local copy. The real benefit to the user is the productivity gain – a single update to an iCalendar means that all subscribers are automatically made aware of the change and there is zero effort on the part of the subscriber; as my former colleague Howard van Rooijen is fond of saying, “work smarter not harder” – nowhere is this edict more ably demonstrated than subscribing versus importing of calendars. If you want to read some more thoughts about iCalendar then go and read my past blog post Calendar syndication - My big hope for 2009's breakthrough technology or better still go and seek out Jon Udell who speaks very authoritatively on the issue of iCalendar. With this subject of iCalendar on my mind I was interested to discover (via Steve Clayton’s blog post Download the world cup fixtures) that the BBC had made a .ics file available containing all of the matches in the upcoming World Cup. As you can probably guess this was a file that was made available so that it could be imported into your calendar of choice. It had one obvious downside though, right now nobody knows who is going to be playing in the knock-out stages so the calendar looks like this: with no teams being named after 25th June. How much more useful would this calendar have been if the BBC had made it possible to subscribe to the calendar instead, thus the calendar could be updated with the teams for the knock out stages when they are known and every subscriber would have a permanently up-to-date record of all the fixtures in their calendar. Better still, the calendar could be updated with match results as well or perhaps even post a match report from the BBC sport pages; when calendars are made subscribable a sea of opportunity opens up for distribution of information. So with that in mind I have decided to go one better than the BBC. I have imported their .ics into a brand new Hotmail calendar and made it publicly available at the following URLs: HTML http://cid-dc1ed121af0476be.calendar.live.com/calendar/World+Cup+2010/index.html iCalendar webcal://cid-dc1ed121af0476be.calendar.live.com/calendar/World+Cup+2010/calendar.ics The link you’re really interested in is the second one - click on that and it should open up in your calendar software of choice. Or, if you want to view it in an online calendar such as Hotmail Calendar or Google Calendar, copy and paste that URL into the appropriate place. Some people have told me they’re having trouble with the iCalendar link in which case hit the HTML link and then click “View ICS” at the resultant web page: I shall endeavour to keep the calendar updated throughout the World Cup and even if I don’t you’re no worse off than if you had imported the BBC’s .ics file so why not give it a try? If I do keep it up to date then you will have a permanent record of the 2010 World Cup available in your calendar. Forever. If you have your calendar synced to your smartphone then you’ll be carrying match reports around with you without you having to do a single thing. Surely that’s worth a quick click isn’t it?   If you have any thoughts let me have them in the comments below. Thanks for reading. @Jamiet Share this post: email it! | bookmark it! | digg it! | reddit! | kick it! | live it!

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  • SolidQ Journal for January (free and available now)

    - by Greg Low
    I've been travelling in Tasmania for a week or so and didn't get to post about the SolidQ Journal for January. It's our free monthly journal at: http://www.solidq.com/sqj . I promised to write a part two on controlling the security context of stored procedures but didn't get time to write this month. I'll rectify that very soon. However, in the meantime, the rest of the team have done a great job again. Guillermo Bas has described how to access SharePoint 2010 data through Windows Phone 7. Marino...(read more)

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  • Run one virtual machine on a Linux server + standard Linux functions

    - by fistameeny
    Hi, I am looking for a method to setup a Linux server (running Ubuntu Server) that uses Samba for file sharing, as well as hosting a Windows virtual machine (in this case, Windows Small Business Server 2003, which in turn hosts SQL Server Express - Exchange won't be used on this). I would like to have the Linux server serving the files over Samba, and hosting the Virtual Machine. This obviously rules ESXi out as it couldn't do Samba at the same time. What would be the next best solution to give reasonable speed? Vmware Server 2.0, VirtualBox, Xen? There will be 10-15 users accessing the Samba shares and the SQL Express virtual machine. Matt

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  • Quote of the day: On backups

    - by BuckWoody
    I saw this one yesterday, and it was a slam-dunk for this morning: "Those who do not archive the past are condemned to retype it." - Garfinkel and Spafford Share this post: email it! | bookmark it! | digg it! | reddit! | kick it! | live it!

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  • Watch @marcorus and @ferrarialberto sessions online #teched #msteched #tee2012

    - by Marco Russo (SQLBI)
    In June I participated to two TechEd editions (North America and Europe). I and Alberto delivered a Pre Conference and two sessions about Tabular. Both conferences provides recorded sessions freely available on Channel 9 so that you can compare which one has been delivered in the best way! If you have to choose between the two versions, consider that in North America we receive more questions during and after the session (still recording), increasing the interaction, whereas in Europe questions usually comes after the session finished (so no recording available). If you’re curious, watch both and let me know which version you prefer, especially for Multidimensional vs Tabular! BISM: Multidimensional vs. Tabular (TechEd North America 2012) BISM: Multidimensional vs. Tabular (TechEd Europe 2012) Many-to-Many Relationships in BISM Tabular (TechEd North America 2012) Many-to-Many Relationships in BISM Tabular (TechEd Europe 2012) If you are interested to learn SSAS Tabular, don’t miss the next SSAS Tabular Workshop online on September 3-4, 2012. We are also planning dates for another roadshow in Europe this fall and I’m happy to announce we’ll have two dates in Germany, too. More updates in the coming weeks.

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  • New Release of Oracle Berkeley DB

    - by Eric Jensen
    We are pleased to announce that a new release of Oracle Berkeley DB, version 11.2.5.2.28, is available today. Our latest release includes yet more value added features for SQLite users, as well as several performance enhancements and new customer-requested features to the key-value pair API.  We continue to provide technology leadership, features and performance for SQLite applications.  This release introduces additional features that are not available in native SQLite, and adds functionality allowing customers to create richer, more scalable, more concurrent applications using the Berkeley DB SQL API. This release is compelling to Oracle’s customers and partners because it: delivers a complete, embeddable SQL92 database as a library under 1MB size drop-in API compatible with SQLite version 3 no-oversight, zero-touch database administration industrial quality, battle tested Berkeley DB B-TREE for concurrent transactional data storage New Features Include: MVCC support for even higher concurrency direct SQL support for HA/replication transactionally protected Sequence number generation functions lower memory requirements, shared memory regions and faster/smaller memory on startup easier B-TREE page size configuration with new ''db_tuner" utility New Key-Value API Features Include: HEAP access method for constrained disk-space applications (key-value API) faster QUEUE access method operations for highly concurrent applications -- up 2-3X faster! (key-value API) new X/open compliant XA resource manager, easily integrated with Oracle Tuxedo (key-value API) additional HA/replication management and communication options (key-value API) and a lot more! BDB is hands-down the best edge, mobile, and embedded database available to developers. Downloads available today on the Berkeley DB download pageProduct Documentation

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  • Difference between Detach/Attach and Restore/BackUp a DB

    - by SAMIR BHOGAYTA
    Transact-SQL BACKUP/RESTORE is the normal method for database backup and recovery. Databases can be backed up while online. The backup file size is usually smaller than the database files since only used pages are backed up. Also, in the FULL or BULK_LOGGED recovery model, you can reduce potential data loss by performing transaction log backups. Detaching a database removes the database from SQL Server while leaving the physical database files intact. This allows you to rename or move the physical files and then re-attach. Although one could perform cold backups using this technique, detach/attach isn't really intended to be used as a backup/recovery process. Commonly it is recommended that you use BACKUP/RESTORE for disaster recovery (DR) scenario and copying data from one location to another. But this is not absolute, sometimes for a very large database, if you want to move it from one location to another, backup/restore process may spend a lot of time which you do not like, in this case, detaching/attaching a database is a better way since you can attach a workable database very fast. But you need to aware that detaching a database will bring it offline for a short time and detaching/attaching does not provide DR function. For more information about detaching and attaching databases, you can refer to: Detaching and Attaching Databases http://technet.microsoft.com/en-us/library/ms190794.aspx

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  • The Primary Cause of Failed IT Projects

    - by Paul Nielsen
    During my career I’ve been a part of dozens of projects. Some I was on from the start, most I came in to help bail out. Some went smooth and were a pleasure to build and maintain and some projects failed (failed being broadly defined as projects that were not completed, or were completed but were a horrid mess – very complex, impossible to maintain, refactor, and a royal pain to keep running.) While there are a number of factors that can contribute to a failed project, in my career it seems the primary...(read more)

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  • Last day of early bird for PowerPivot Workshop in Dublin #ppws

    - by Marco Russo (SQLBI)
    The early bird discount for the PowerPivot Workshop in Dublin will expire today, Friday 11 March. There is also an upcoming workshop in Copenhagen (March 21-22, 2011) and a PowerPivot workshop in Zurich on April 4-5, 2011. I and Alberto are preparing new material in these days: something will integrate the workshop, other will be useful useful for future blog posts. We are discovering many new areas where the Vertipaq engine is really interesting for doing jobs he was probably not tought for! More...(read more)

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  • Finding rows that intersect with a date period

    - by DavidWimbush
    This one is mainly a personal reminder but I hope it helps somebody else too. Let's say you have a table that covers something like currency exchange rates with columns for the start and end dates of the period each rate was applicable. Now you need to list the rates that applied during the year 2009. For some reason this always fazes me and I have to work it out with a diagram. So here's the recipe so I never have to do that again: select  * from    ExchangeRate where   StartDate < '31-DEC-2009'         and EndDate > '01-JAN-2009'   That is all!

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  • ObjectStorageHelper<T> now available for Windows 8 RTM

    - by jamiet
    In October 2011 I wrote a blog post entitled ObjectStorageHelper<T> – A WinRT utility for Windows 8 where I introduced a little utility class called ObjectStorageHelper<T> that I had been working on while noodling around on the Developer Preview of Windows 8. ObjectStorageHelper<T> makes it easy for anyone building apps for Windows 8 to save data to files. How easy? As easy as this: var myPoco = new Poco() { IntProp = 1, StringProp = "one" }; var objectStorageHelper = new ObjectStorageHelper<Poco>(StorageType.Local); await objectStorageHelper.SaveAsync(myPoco); Compare that to the plumbing code that you would have to write otherwise: var Obj = new Poco() { IntProp = 1, StringProp = "one" }; StorageFile file = null; StorageFolder folder = GetFolder(storageType); file = await folder.CreateFileAsync(FileName(Obj), CreationCollisionOption.ReplaceExisting); IRandomAccessStream writeStream = await file.OpenAsync(FileAccessMode.ReadWrite); using (Stream outStream = Task.Run(() => writeStream.AsStreamForWrite()).Result) {     serializer.Serialize(outStream, Obj);     await outStream.FlushAsync(); } and you can see how ObjectStorageHelper<T> can help save a Windows 8 developer quite a few headaches. ObjectStorageHelper<T> simply requires you to pass it an object to be saved, tell it where to save it (Roaming, Local or Temporary), and you’re done. Retrieving an object from storage is equally as simple: var objectStorageHelper = new ObjectStorageHelper<Poco>(StorageType.Local); var myPoco = await objectStorageHelper.LoadAsync(); Please check the homepage for the project at http://winrtstoragehelper.codeplex.com/ for (much) more info. A number of people have used and tested ObjectStorageHelper<T> since those early days and one of those folks in particular, David Burela, was good enough to report a couple of bugs: Saving Asynchronously Save fails when class is in another project As a result of David’s bug reports and some more extensive testing on my side I have overhauled the initial code that I wrote last October and am confident that it is now much more robust and ready for primetime (check the commit history if you’re interested). The source code (which, again, you can find on Codeplex at http://winrtstoragehelper.codeplex.com/) includes a suite of unit tests to test all of the basic use cases (if you can think of any more please let me know). If you use this in any of your Windows 8 projects then please let me know. I love getting feedback and I’d also love to know if this is actually being used anywhere. @Jamiet

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  • OT: NCAA Pick'em Returns...

    - by RickHeiges
    Every year in March, the Men's College Basketball Championship Tourney Begins. For the past few years, I've put together a "League". This year is no different. The prize... Bragging Rights - that's it - nothing else.... Follow the link below to sign up! Picks must be made by Thursday before the games begin. http://tournament.fantasysports.yahoo.com/t1/register/joinprivategroup_assign_team?GID=65521&P=sqlblog&P=sqlblog Share this post: email it! | bookmark it! | digg it! | reddit! | kick it!...(read more)

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  • Testing with Profiler Custom Events and Database Snapshots

    We've all had them. One of those stored procedures that is huge and contains complex business logic which may or may not be executed. These procedures make it an absolute nightmare when it comes to debugging problems because they're so complex and have so many logic offshoots that it's very easy to get lost when you're trying to determine the path that the procedure code took when it ran. Fortunately Profiler lets you define custom events that you can raise in your code and capture in a trace so you get a better window into the sub events occurring in your code. I found it very useful to use custom events and a database snapshot to debug some code recently and we'll explore both in this article. I find raising these events and running Profiler to be very useful for testing my stored procedures on my own as well as when my code is going through official testing and user acceptance. It's a simple approach and a great way to catch any performance problems or logic errors.

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  • ArchBeat Link-o-Rama for November 21, 2012

    - by Bob Rhubart
    Fault Handling and Prevention - Part 1 | Guido Schmutz and Ronald van Luttikhuizen In this technical article, part one of a four part series, Oracle ACE Directors Guido Schmutz and Ronald van Luttikhuizen guide you through an introduction to fault handling in a service-oriented environment using Oracle SOA Suite and Oracle Service Bus. One Stop Shop for Oracle Webcasts Webcasts can be a great way to get information about Oracle products without having to go cross-eyed reading yet another document off your computer screen. Oracle's new Webcast Center offers selectable filtering to make it easy to get to the information you want. Yes, you have to register to gain access, but that process is quick, and with over 200 webcasts to choose from you know you'll find useful content. Oracle on Oracle: Is that all? (Identity Management)| Darin Pendergraft Darin Pendergraft shares a discussion with Jaime Cardoso aboutthe latter's experience with Oracle's IDM products. What's particularly interesting is that the discussion grew out of Jaime's highly critical comment that Darin missed important pointsabout those products in an earlier interview Chirag Andani. If that ain't social engagement, I don't know what is. I.T. Chargeback : Core to Cloud Computing | Zero to Cloud "While chargeback has existed as a concept for many years (especially in mainframe environments), it is the move to this self-service model that has created a need for a new breed of chargeback applications for cloud," says Mark McGill. "Enabling self-service without some form of chargeback is like opening a shop where all of the goods are free." New Self-paced Online Oracle BPM 11g Developer Training | Dan Atwood Oracle ACE Dan Atwood of Avio Consulting shares a lot of information about a new Oracle BPM 11g Developer Workshop. JPA SQL and Fetching tuning ( EclipseLink ) | Edwin Biemond Oracle ACE Edwin Biemond's post illustrates how to "use the department and employee entity of the HR Oracle demo schema to explain the JPA options you have to control the SQL statements and the JPA relation Fetching." Thought for the Day "Team development is like a birthday cake. Everybody gets a piece." — Assaad Chalhoub Source: SoftwareQuotes.com

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  • SSIS ForEachLoop Container

    - by Leonard Mwangi
    I recently had a client request to create an SSIS package that would loop through a set of data in SQL tables to allow them to complete their data transformation processes. Knowing that Integration Services does have ForEachLoop Container, I knew the task would be easy but the moment I jumped into it I figured there was no straight forward way to accomplish the task since for each didn’t really have a loop through the table enumerator. With the capabilities of integration Services, I was still confident that it was possible it was just a matter of creativity to get it done. I set out to discover what different ForEach Loop Editor Enumerators did and settled with Variable Enumerator.  Here is how I accomplished the task. 1.       Drop your ForEach Loop Container in your WorkArea. 2.       Create a few SSIS Variable that will contain the data. Notice I have assigned MyID_ID variable a value of “TEST’ which is not evaluated either. This variable will be assigned data from the database hence allowing us to loop. 3.       In the ForEach Loop Editor’s Collection select Variable Enumerator 4.       Once this is all set, we need a mechanism to grab the data from the SQL Table and assigning it to the variable. Fig: Select Top 1 record Fig: Assign Top 1 record to the variable 5.       Now all that’s required is a house cleaning process that will update the table that you are looping so that you can be able to grab the next record   A look of the complete package

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  • SSRS Parameters and MDX Data Sets

    - by blakmk
    Having spent the past few weeks creating reports and dashboards in SSRS and SSAS 2008, I was frustrated by how difficult it is to use custom datasets to generate parameter drill downs. It also seems Reporting Services can be quite unforgiving when it comes to renaming things like datasets, so I want to share a couple of techniques that I found useful. One of the things I regularly do is to add parameters to the querys. However doing this causes Reporting Services to generate a hidden dataset and parameter name for you. One of the things I like to do is tweak these hidden datasets removing the ‘ALL’ level which is a tip I picked up from Devin Knight in his blog: There are some rules i’ve developed for myself since working with SSRS and MDX, they may not be the best or only way but they work for me. Rule 1 – Never trust the automatically generated hidden datasets Or even ANY, automatically generated MDX queries for that matter.... I’ve previously blogged about this here.   If you examine the MDX generated in the hidden dataset you will see that it generates the MDX in the context of the originiating query by building a subcube, this mean it may NOT be appropriate to use this in a subsequent query which has a different context. Make sure you always understand what is going on. Often when i’m developing a dashboard or a report there are several parameter oriented datasets that I like to manually create. It can be that I have different datasets using the same dimension but in a different context. One example of this, is that I often use a dataset for last month and a dataset for the last 6 months. Both use the same date hierarchy. However Reporting Services seems not to be too smart when it comes to generating unique datasets when working with and renaming parameters and datasets. Very often I have come across this error when it comes to refactoring parameter names and default datasets. "an item with the same key has already been added" The only way I’ve found to reliably avoid this is to obey to rule 2. Rule 2 – Follow this sequence when it comes to working with Parameters and DataSets: 1.    Create Lookup and Default Datasets in advance 2.    Create parameters (set the datasets for available and default values) 3.    Go into query and tick parameter check box 4.    On dataset properties screen, select the parameter defined earlier from the parameter value defined earlier. Rule 3 – Dont tear your hair out when you have just renamed objects and your report doesn’t build Just use XML notepad on the original report file. I found I gained a good understanding of the structure of the underlying XML document just by using XML notepad. From this you can do a search and find references of the missing object. You can also just do a wholesale search and replace (after taking a backup copy of course ;-) So I hope the above help to save the sanity of anyone who regularly works with SSRS and MDX.

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  • How&rsquo;s your Momma an&rsquo; them?

    - by Bill Jones Jr.
    When a Southern “boy” like me sees somebody that used to be, or should be, a close friend or relative that they haven’t seen in a long time, that’s a typical greeting.  Come to think of it, we were often related to close friends. So “back in the day”, we not only knew people but everybody close to them.  When I started driving, my Dad told me to always drive carefully in Polk county.  He said if I ran into anybody there, it was likely they would be related or close family friends. Not so much any more… the cities have gotten bigger and more people come south and stay.  One of the curses of air conditioning I guess. Anyway, it’s been a while.  So “How’s your Momma and them”?  Have you been waiting for me to blog again?  Too bad, I’m back anyway <smile>. Here in Charlotte we just had another great code camp.  The Enterprise Developers Guild is going strong, thanks to the help of a lot of dedicated people.  Mark Wilson, Brian Gough, Syl Walker, Ghayth Hilal, Alberto Botero, Dan Thyer, Jean Doiron, Matt Duffield all come to mind.  Plus all the regulars who volunteer for every special event we have. Brian Gough put on a successful SharePoint Saturday.  Rafael Salas and our friends at the local Pass SQL group had a great SQL Saturday.  Brian Hitney and Glen Gordon keep on doing their usual great job for developers in the southeast as our local Microsoft reps. Since my last post, I have the honor of being designated the INetA Membership Mentor for Georgia in addition to mentoring the groups in the Carolinas for the past several years.  Georgia could be a really good thing since my wife likes shopping in Atlanta, not to mention how much we both like Georgia in general.  As I recall, my Momma had people in Georgia.  Wonder how their “Mommas an’ them” are doing?   Bill J

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  • XMLPad – a new tool in my developer utility belt

    - by jamiet
    Yesterday I was on the lookout for a free tool that would help me write XPath statements. I put a shout out on Twitter and Johan Barnard replied saying : Give XMLPad a try http://www.wmhelp.com/xmlpad3.htm I’m sure there are legions of developers out there that know all about XMLPad but I had never heard about it so I suspect some of you reading haven’t either. Today I downloaded it to give it a run out and I gotta say – I love it. I only used it to do one thing –constructing an XPath expression to point to a particular Configuration definition in a .dtsx file- and it allowed me to do that with consummate ease. The feature I particularly loved was that, similar to Google Suggest, it showed me results from my expression as I typed. Here is a screenshot of my XPath expression to find (and just try saying this in a hurry) the value of a property whose DTS:Name attribute equals ‘ConfigurationString’ of a Configuration definition where the value of that Configuration definition’s property whose DTS:Name attribute equals ‘ObjectName’, equals ‘BIConfig My XPath expression: /DTS:Executable/DTS:Configuration[DTS:Property[@DTS:Name=’ObjectName’]=’BIConfig’]/DTS:Property[@DTS:Name=’ConfigurationString’] and believe me, there was no way I would have been able to come up with that without a tool to help me! So, an easy tip for you – if you need to write XPath expression download XMLPad for free from http://www.wmhelp.com/xmlpad3.htm and see what it can do for you. That’s all. Its now Friday evening and I’m shutting down and relaxing before heading to the big game at Twickenham tomorrow (yes, I have a ticket ). Have a good one! @Jamiet

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