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Davide Mauri

A place for my thoughts and experiences on SQL Server, Business Intelligence and .NET

  • Extended Events did it again: monitoring Stored Procedures performance

    In the last days I  had to work quite a lot with extended events in order to deeply monitor SQL Server performance. One interesting request that came out while implementing the monitoring infrastructure, was the possibility to monitor the performance of a set of stored procedures, vital for the correct handling of an online booking procedure.

    The challenge was to give a sort of real-time monitor of procedure performances so that one can then create alert and/or do some stream-analysis to keep response time always under the desired amount of time.

    Here’s how you can do it using Extended Events, monitoring, for example, the execution of procedure uspGetManagerEmployees in AdventureWorks2012:

    CREATE EVENT SESSION [monitor_procedure_performance] ON SERVER
    ADD EVENT sqlserver.rpc_completed
            ACTION    (package0.collect_system_time,package0.process_id,sqlserver.client_app_name,sqlserver.client_connection_id,sqlserver.client_hostname,sqlserver.client_pid,sqlserver.database_id,sqlserver.database_name,sqlserver.nt_username,sqlserver.request_id,sqlserver.session_id,sqlserver.session_nt_username,sqlserver.sql_text,sqlserver.transaction_id,sqlserver.transaction_sequence,sqlserver.username)
            WHERE    ([object_name]=N'uspGetManagerEmployees')
    ADD EVENT sqlserver.module_end
            ACTION    (package0.collect_system_time,package0.process_id,sqlserver.client_app_name,sqlserver.client_connection_id,sqlserver.client_hostname,sqlserver.client_pid,sqlserver.database_id,sqlserver.database_name,sqlserver.nt_username,sqlserver.request_id,sqlserver.session_id,sqlserver.session_nt_username,sqlserver.sql_text,sqlserver.transaction_id,sqlserver.transaction_sequence,sqlserver.username)
            WHERE    ([object_name]=N'uspGetManagerEmployees')
    ADD TARGET package0.ring_buffer

    Once done, it’s all about decoding the XML that Extended Events returns:


        Analyze XEvent data

    IF (OBJECT_ID('tempdb..#t') IS NOT NULL) DROP TABLE #t
    IF (OBJECT_ID('tempdb..#r') IS NOT NULL) DROP TABLE #r

        cast(target_data as xml) xdoc
        sys.dm_xe_sessions s
    inner join
        sys.dm_xe_session_targets t on t.event_session_address = s.address
    where = 'monitor_procedure_performance'

    with cte as
            event_number = ROW_NUMBER() over (order by T.x),
            event_timestamp = T.x.value('@timestamp', 'datetimeoffset'),
            T.x.query('.') as event_data
        cross apply
            xdoc.nodes('/RingBufferTarget/event') T(x)
    cte2 as (
            --data_field = T2.x.value('local-name(.)', 'varchar(100)'),
            data_name = T2.x.value('@name', 'varchar(100)'),
            data_value = T2.x.value('value[1]', 'varchar(100)'),
            data_text = T2.x.value('text[1]', 'varchar(max)')
            cte c
        cross apply
            c.event_data.nodes('event/*') T2(x)
    cte3 as (
            data_name in ('collect_system_time', 'object_name', 'cpu_time', 'duration', 'logical_reads', 'row_count', 'database_name', 'database_id')
        (max(data_value) for data_name in (database_id, database_name, object_name, cpu_time, duration, logical_reads, row_count)) T

    --SELECT * FROM #t
    SELECT * FROM #r

        execution_date = cast(event_timestamp as date),
        execution_hour = datepart(hour, event_timestamp),
        execution_minute = datepart(minute, event_timestamp),
        duration_msec = avg(cast(duration as int)) / 1000.
    group by
        cast(event_timestamp as date), datepart(hour, event_timestamp), datepart(minute, event_timestamp), [object_name]

    That’s it. You can now keep monitored execution times of your procedure.

  • Trapping SQL Server Errors with Extended Events

    One very useful usage of Extended Events is the ability to trap SQL Server error without the need to have a server trace running (which, btw, is deprecated), with the additional feature of being able to query the data as soon as it comes in. This means that we a solution to monitor and trap errors as soon as they happen can be easily created, in order to help developers to fix problems as soon as they are detected. This is really, really, really helpful especially in very big applications, where the code base is quite old and there is no-one really knowing everything of the solution.

    To start a Extended Events sessions in order to trap SQL Server errors with severity greater than 10, just run the following script:

    ADD EVENT sqlserver.error_reported
            ACTION    (package0.collect_system_time,package0.last_error,sqlserver.client_app_name,sqlserver.client_hostname,sqlserver.database_id,sqlserver.database_name,sqlserver.nt_username,sqlserver.plan_handle,sqlserver.query_hash,sqlserver.session_id,sqlserver.sql_text,sqlserver.tsql_frame,sqlserver.tsql_stack,sqlserver.username)
            WHERE    ([severity]>10)
    ADD TARGET package0.event_file
            SET filename=N'D:\Program Files\Microsoft SQL Server\MSSQL11.MSSQLSERVER\MSSQL\XEvents\error_trap.xel'


    The problem with Exended Events is that they only talks XML which is surely flexible and extensible, but not at all confortable to be queried. That’s why I prefer to turn it into something relational. Using the xml nodes function and pivoting data can make the trick:

    IF (OBJECT_ID('tempdb..#e') IS NOT NULL) DROP TABLE #e

    WITH cte AS
            CAST(event_data AS XML) AS event_data
            sys.fn_xe_file_target_read_file('D:\Program Files\Microsoft SQL Server\MSSQL11.MSSQLSERVER\MSSQL\XEvents\error_trap*.xel', NULL, NULL, NULL)
    cte2 AS
            event_number = ROW_NUMBER() OVER (ORDER BY T.x)
        ,    event_name = T.x.value('@name', 'varchar(100)')
        ,    event_timestamp = T.x.value('@timestamp', 'datetimeoffset')
        ,    event_data
            event_data.nodes('/event') T(x)
    SELECT * INTO #e FROM cte2

    WITH cte3 AS
            --data_field = T2.x.value('local-name(.)', 'varchar(100)'),
            data_name = T2.x.value('@name', 'varchar(100)'),
            data_value = T2.x.value('value[1]', 'varchar(max)'),
            data_text = T2.x.value('text[1]', 'varchar(max)')
            #e c
            c.event_data.nodes('event/*') T2(x)
    cte4 AS
            data_name IN ('error_number', 'severity', 'message', 'database_name', 'database_id', 'client_hostname', 'client_app_name', 'collect_system_time', 'username')
        (MAX(data_value) FOR data_name IN ([error_number], [severity], [message], database_name, database_id, username, client_hostname, client_app_name, collect_system_time)) T
        [severity] > 10
        event_timestamp DESC

    and voilà, now all errors can be easily identified:


    It’s now very easy to create reports and dashboards to monitor the system in (near) real time. And this is vital when you run a 24x7 online business.

  • Forcing “Custom Properties” of a Data Flow Transformation to support DTS Expression

    Today I was using a 3rd Party Data Flow component that has several Custom Properties for which I need to change some of their values at runtime using a DTS Expression.

    To mimic the situation let’s use the “Percentage Sampling” that has two Custom Properties:


    Of the two Custom Properties only some (one in this case) are available also outside that dataflow, so that they can be targeted by a DTS Expression. Such properties are listed under the “Misc.” section of Data Flow properties


    and also in the Property Expression Editor window:


    Now, what if you need to make also the “hidden” custom properties available for DTS Expression usage? As you may have noticed, the SamplingSeed is not exposed outside the Data Flow. I tried to search the web, but after several minutes I gave up since I wasn’t able to find anything that could help. I then started to look into the SSIS object model and I found a nice property named expressionType in the IDTSCustomProperty interface that tells to the engine if the property value can be specified using DTS Expression or not:

    If the value is set to Notify than the usage of DTS Expression is possible otherwise, if the property is set to None, as the name implies, DTS Expression cannot be used.

    So all you need to do is to open the .dtsx file, look for the component you want to touch and its properties


    and add (if not exists) or change the expressionType attribute to Notify:


    Save the file and voilà, the property is now available for DTS Expression usage!


    Now, just be aware that is a sort of an hack, so double check it works for you. On the 3rd party components we’re using it works like a charm, and it just saved that day since without the ability to change some properties at run time, the deployment of our package in production could have been a nightmare.

    I tested this approach both on SQL Server 2012 and SQL Server 2008 and in both cases I hadn’t had any problems.

    Hope this helps someone Smile, enjoy!

  • Power Pivot SQL Agent Job Monitor

    In the last days I needed a quick and efficient way to monitor the performance of a job and of each step over time. There’s a lot of interesting data in MSDB database and the various sysjob tables, but the stored data is not really easy to use outside the Management Studio. Date and Time are not stored as date/time data type, there is no easy way to correlate the performance of a step with the related job execution (for example is not that easy to return all the steps of a job executed, say, yesterday at 10:00).

    So I decided to write some views to make the querying easier and then the next move was to create a Tabular Model with Power Pivot on Excel to make also analysis easier.

    Since this is a somehow recurring task that I find myself doing during my job – not often, but when I have to do it now I have something much more powerful in my hands – I decided to put it also con CodePlex so that that little work can be shared with the community.

    You can find the scripts with the objects (3 UDFs and 4 Views) that must be created inside MSDB and the Power Pivot Excel 2010 model here:


  • Data Warehouse Workshop

    I’m really really pleased to announce that it’s possible to register to the Data Warehouse Workshop that I and Thomas Kejser developed togheter.  Several months ago we decided to join forces in order to create a workshop that would contain not only the theoretical stuff, but also the experience we both have and all the best practices and lesson learned that can make the difference between a success and a failure when building a Data Warehouse.

    The first sheduled date is 7 February in Kista (Sweden):

    and until 30th November there is the Super Early Bird to save more the 100€ (150$).

    The workshop will be very similar to the one I delivered at PASS Summit summit, with some extra technical stuff since it’s one hour longer. In addition to that for this first version both me and Thomas will be present, so it’s a great change  to make sure you super-charge your DW/BI project with insights that aren’t available anywhere else!

    If you’re into the BI field and you live in Europe, don’t miss this opportunity!

  • Insert Or update (aka Replace or Upsert)

    The topic is really not new but since it’s the second time in few days that I had to explain it different customers, I think it’s worth to make a post out of it.

    Many times developers would like to insert a new row in a table or, if the row already exists, update it with new data. MySQL has a specific statement for this action, called REPLACE:

    or the INSERT …. ON DUPLICATE KEY UPDATE option:

    With SQL Server you can do the very same using a more standard way, using the MERGE statement, with the support of Row Constructors.

    Let’s say that you have this table:

    CREATE TABLE dbo.MyTargetTable
        alternate_key VARCHAR(50) UNIQUE,
        col_1 INT,
        col_2 INT,
        col_3 INT,
        col_4 INT,
        col_5 INT

    INSERT [dbo].[MyTargetTable] VALUES
    ('GUQNH', 10, 100, 1000, 10000, 100000),
    ('UJAHL', 20, 200, 2000, 20000, 200000),
    ('YKXVW', 30, 300, 3000, 30000, 300000),
    ('SXMOJ', 40, 400, 4000, 40000, 400000),
    ('JTPGM', 50, 500, 5000, 50000, 500000),
    ('ZITKS', 60, 600, 6000, 60000, 600000),
    ('GGEYD', 70, 700, 7000, 70000, 700000),
    ('UFXMS', 80, 800, 8000, 80000, 800000),
    ('BNGGP', 90, 900, 9000, 90000, 900000),
    ('AMUKO', 100, 1000, 10000, 100000, 1000000)

    If you want to insert or update a row, you can just do that:

        dbo.MyTargetTable T
        (SELECT * FROM (VALUES ('ZITKS', 61, 601, 6001, 60001, 600001)) Dummy(alternate_key, col_1, col_2, col_3, col_4, col_5)) S
        T.alternate_key = S.alternate_key
        INSERT VALUES (alternate_key, col_1, col_2, col_3, col_4, col_5)
        MATCHED AND T.col_1 != S.col_1 THEN
        UPDATE SET
            T.col_1 = S.col_1,
            T.col_2 = S.col_2,
            T.col_3 = S.col_3,
            T.col_4 = S.col_4,
            T.col_5 = S.col_5

    If you want to insert/update more than one row at once, you can super-charge the idea using Table-Value Parameters, that you can just send from your .NET application.

    Easy, powerful and effectiveSmile

  • Agile Data Warehousing with SQL Server 2012 Q&A

    Yesterday has been published my Q&A interview on my Pre-Conference Workshop at SQL Pass 2012. It’s a good way to understand what will be discussed in the workshop, so if you’re interested or you’re into the Data Warehouse / Business Intelligence field and want to understand how the Agile approach can help you, you can read it here:

  • PASS Summit for SQL Starters

    I’ve received a buch of emails from PASS Summit “First Timers” that are also somehow new to SQL Server (for “somehow” I mean people with less than 6 month experience but with some basic knowledge of SQL Server engine) or are catching up from SQL Server 2000. The common question regards the session one should not miss to

    • have a broad view of the entire SQL Server platform
    • have some insight into some specific areas of SQL Server

    Given that I’m on (semi-)vacantion and that I have more free time (not true, I have to prepare slides & demos for several conferences, PASS Summit  - Building the Agile Data Warehouse with SQL Server 2012 - and PASS 24H - Agile Data Warehousing with SQL Server 2012 - among them…but let’s pretend it to be true), I’ve decided to make a post to answer to this common questions. Of course this is my personal point of view and given the fact that the number and quality of session that will be delivered at PASS Summit is so high that is very difficoult to make a choice, fell free to jump into the discussion and leave your feedback or – even better – answer with another post. I’m sure it will be very helpful to all the SQL Server beginners out there.

    I’ve imposed to myself to choose 6 session at maximum for each Track. Why 6? Because it’s the maximum number of session you can follow in one day, and given that all the session will be on the Summit DVD, they are the answer to the following question: “If I have one day to spend in training, which session I should watch?”.

    Of course a Summit is not like a Course so a lot of very basics concept of well-established technologies won’t be found here. Analysis Services, Integration Services, MDX are not part of the Summit this time (at least for the basic part of them).

    Enough with that, let’s start with the session list ideal to have a good Overview of all the SQL Server Platform:

    for what concern Database Development, I recommend the following sessions

    For Business Intelligence Information Delivery

    and for Business Intelligence Architecture & Development

    Beside the listed sessions, First Timers should also take a look the the page PASS set up for them:

    See you at PASS Summit!

  • DBDebunk is back!

    After saveral years of silence, Fabian Pascal, has started to work again on its DB Debunkings website! The site has now been moved on blogspot and can be found here

    The website is just a *great* resource for everyone involved in the DB space, and if you never heard of it before, it’s now time to discover it. Fabian has done a tremendous work  to educate people to the Relational Theory and the Relational Databases, and many of the myths, doubt and “obscurity” that surrounds Relational Database can be debunked reading it’s post, papers and book.

    Want to have an example? Ever had some doubt on the NULL usage and purpose? If yes (and I’m sure you had!) read here:

    Welcome back Fabian!!!!!!


    The “old” website is still active in case you want to visit it:

  • PASS Summit Preconference and Sessions

    I’m very pleased to announce that I’ll be delivering a Pre-Conference at PASS Summit 2012. I’ll speak about Business Intelligence again (as I did in 2010) but this time I’ll focus only on Data Warehouse, since it’s big topic even alone. I’ll discuss not only what is a Data Warehouse, how it can be modeled and built, but also how it’s development can be approached using and Agile approach, bringing the experience I gathered in this field.

    Building the Agile Data Warehouse with SQL Server 2012

    I’m sure you’ll like it, especially if you’re starting to create a BI Solution and you’re wondering what is a Data Warehouse, if it is still useful nowadays that everyone talks about Self-Service BI and In-Memory databases, and what’s the correct path to follow in order to have a successful project up and running.

    Beside this Preconference, I’ll also deliver a regular session, this time related to database administration, monitoring and tuning:

    DMVs: Power in Your Hands

    Here we’ll dive into the most useful DMVs, so that you’ll see how that can help in everyday management in order to discover, understand and optimze you SQL Server installation, from the server itself to the single query.

    See you there!!!!!

  • Wordpress Installation (on IIS and SQL Server)

    To proceed with the installation of Wordpress on SQL Server and IIS, first of all, you need to do the following steps

    1. Create a database on SQL Server that will be used by Wordpress
    2. Create login that can access to the just created database and put the user into ddladmin, db_datareader, db_datawriter roles
    3. Download and unpack Wordpress 3.3.2 (latest version as of 27 May 2012) zip file into a directory of your choice
    4. Download the wp-db-abstraction 1.1.4 (latest version as of 27 May 2012) plugin from website

    Now that the basic action has been done, you can start to setup and configure your Wordpress installation.

    Unpack and follow the instructions in the README.TXT file to install the Database Abstraction Layer. Mainly you have to:

    • Upload wp-db-abstraction.php and the wp-db-abstraction directory to wp-content/mu-plugins.  This should be parallel to your regular plugins directory.  If the mu-plugins directory does not exist, you must create it.
    • Put the db.php file from inside the wp-db-abstraction.php directory to wp-content/db.php

    Now you can create an application pool in IIS like the following one


    Create a website, using the above Application Pool, that points to the folder where you unpacked Wordpress files.

    Be sure to give the “Write” permission to the IIS account, as pointed out in this (old, but still quite valid) installation manual:

    Now you’re ready to go. Point your browser to the configured website and the Wordpress installation screen will be there for you.

    When you’re requested to enter information to connect to MySQL database, simply skip that page, leaving the default values. If you have installed the Database Abstraction Layer, another database installation screen will appear after the one used by MySQL, and here you can enter the configuration information needed to connect to SQL Server.

    After having finished the installation steps, you should be able to access and navigate your wordpress site.  A final touch, and it’s done: just add the needed rewrite rules

    and that’s it!


    Well. Not really. Unfortunately the current (as of 27 May 2012) version of the Database Abstraction Layer (1.1.4) has some bugs. Luckily they can be quickly fixed:

    Backslash Fix

    Select Top 0 Fix
    Make the change to the file “.\wp-content\mu-plugins\wp-db-abstraction\translations\sqlsrv\translations.php” suggested by “debettap” Winking smile

    And now you have a 100% working Wordpress installation on SQL Server!

    Since I also wanted to take advantage of SQL Server Full Text Search, I’ve created a very simple wordpress plugin to setup full-text search and to use it as website search engine:


  • SSAS DMVs: useful links

    From time to time happens that I need to extract metadata informations from Analysis Services DMVS in order to quickly get an overview of the entire situation and/or drill down to detail level. As a memo I post the link I use most when need to get documentation on SSAS Objects Data DMVs:

    SSAS: Using DMV Queries to get Cube Metadata

    SSAS DMV (Dynamic Management View)

    Use Dynamic Management Views (DMVs) to Monitor Analysis Services

  • PHP Setup for IIS and SQL Server

    Making PHP running on IIS and configuring it to be able to connect and query a SQL Server database is quite easy. If just need to get pointed to the correct direction, since information are spread all across the web but sometimes is not easy to understand to which version they apply.

    So, since our primary goal is to have Wordpress 3.3.2 (the latest version as of 07 May 2012) and PHPBB 3.0.12 (the latest version as of 07 May 2012) up and running, we’ll download the latest PHP 5.3 version (PHP 5.4 has been reported to have some problems with the current version of Wordpress so we won’t go for the latest one).

    So the first step is to download PHP 5.3.12 version from PHP.NET web site:

    As you may notice there are tow flavor of the PHP distribution: Thread Safe and Non Thread Safe (NTS).

    I’ve googled/binged a bit to understand what’s the advised flavor and as you can read here 

    the best practice is to use the NTS flavor.

    I downloaded the Zip package, and unzipped the files in a newly created PHP directory under C: drive (C:\PHP)

    The above link also pointed me to a resource page very helpful for everyone trying to install PHP and configure on IIS:

    The following link give also additional information

    I also found a very nice IIS Add-on that allows you to manage PHP directly from IIS:

    One installed the PHP Manager, you can check that everything is working simply checking that PHPINFO() works:



    To be able to use SQL Server from PHP you need the PHP SQL Server Drivers provided by Microsoft:

    Once the file has ben downloaded I extracted it to a C:\PHPSQLSRVfolder.

    Now you must acknowledge PHP that they exists and should be used. You can do it directly modifying your <php install folder>\php.ini file, adding the reference to the extension,


    begin sure to have copied the correct .dll file into the <php install folder>\ext folder.


    if you have installed the PHP Manager, you can also enable/disable extension from here (.dll file must be manually copied into the /ext directory anyway)


    As you may have noticed, after having unzipped the PHP SQL Server Drivers  you have a bunch of files to choose from. Which is the one right for you? For the configuration we’ve chosen we have to go for the “standard” (which means not the “pdo” driver), non-thread safe PHP 5.3 driver. As you can guess the file we need is


    After having restarted your website, you can check in the phpinfo() page if the extension was loaded correcty:



    I strongly suggest to take a look at the help file that comes with the PHP SQL Server Drivers, so that you can start to get used to access SQL Server from PHP. In particular use the code shown in the

    “How to: Connect Using SQL Server Authentication”

    help article in order to create a .php page to test that your environment can correctly connect to SQL Server.

    Of course be sure to have at least the SQL Server Native Client installed on the web server, otherwise you won’t be able to connect to SQL Server from PHP.

    That’s it! You now have a PHP environment on you IIS 7 / 7.5 capable of using SQL Server as RDBMS.

  • Wordpress and PHPBB on SQL Server

    In the last months, in the spare time, I started to study PHP in order to use it on a Windows + SQL Server box. Why you would do such thing you may be wondering. The point is that Wordpress is actually, IMHO, the state of the art of a free CMS that must be used as the backend for a community site: it’s feature-rich, it has a *lot* of plugins and themes, it can be used to host blogs and to empower a “thematic” website. In my case I’d like to refresh the engine used to publish the Italian SQL Server User Group website.

    I’ve looked for a lot of alternatives in the .NET World, and I evaluated in the last year

    • Umbraco
    • DotNetNuke
    • Community Server
    • Orchard
    • ScrewturnWiki

    For one reason or another, none of the mentioned platforms, which are great platforms BTW, was the right for us. We needed something

    • Capable of managing a community portal with news, articles, events, calendars and so on
    • Capable of managing the blogs of members, allowing the generation of new blog sub site on the fly
    • Fully customizable with a minimum effort for the end user
    • Enabled to use HTML5 and CSS3
    • Stable and Mature, with a good documentation and/or forum support
    • Easy to be extended/modified adapted to our needs
    • Compatible with MSN Live Writer
    • Compatible with SQL Server
    • Capable of hosting forums or capable of be integrated with a 3rd party forum platform

    And at the end the platform that suits all our need is…Wordpress!

    Of course this decision bring some challenges in the game:

    • I need to be sure that Wordpress can work *well* with SQL Server
    • I need to integrate Wordpress with a forum software.

    Luckily Microsoft has written a cool abstraction layer for Wordpress, that make it compatible with SQL Server. And, even more luckily, there is a mainstream forum solution, PHPBB, natively compatible with SQL Server.

    Of course not everything is as smooth as one would like it to be, so there are some “attention point” that one need to take into account when going in this way. And since there isn’t a lot of  documentation available on running Wordpress together with PHPBB on SQL Server, I though that writing some post can be helpful to the community. After all Wordpress and PHPBB are two *great* solution and having them available on SQL Server is something desirable in my opinion.

    So, in the next months, I’ll write a series of four (maybe five) posts to describe how to have a Wordpress + PHPBB on IIS + SQL Server solution up and running.

    Here’s the agenda of the next posts:

    I’ll hope you’ll enjoy the topics!

  • SQL Bits X – Temporal Snapshot Fact Table Session Slide & Demos

    Already 10 days has passed since SQL Bits X in London. I really enjoyed it! Those kind of events are great not only for the content but also to meet friends that – due to distance – is not possible to meet every day. Friends from PASS, SQL CAT, Microsoft, MVP and so on all in one place, drinking beers, whisky and having fun. A perfect mixture for a great learning and sharing experience!

    I’ve also enjoyed a lot delivering my session on Temporal Snapshot Fact Tables. Given that the subject is very specific I was not expecting a lot of attendees….but I was totally wrong! It seems that the problem of handling daily snapshot of data is more common than what I expected.

    I’ve also already had feedback from several attendees that applied the explained technique to their existing solution with success. This is just what a speaker in such conference wish to hear! :)

    If you want to take a look at the slides and the demos, you can find them on SkyDrive:!1151&parid=root

    The demo is available both for SQL Sever 2008 and for SQL Server 2012. With this last version, you can also simplify the ETL process using the new LEAD analytic function. (This is not done in the demo, I’ve left this option as a little exercise for you :) )

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