Strangely enough for a predominantly SSIS blog, this post is all about how
to perform data profiling without using SSIS. Whilst the Data Profiling Task is a worthy addition, there are a couple of limitations I’ve encountered of late. The first is that it requires SQL Server 2008, and not everyone is there yet. The second is that it can only target SQL Server 2005 and above. What about older systems, which are the ones that we probably need
to investigate the most, or other vendor databases such as Oracle? With these limitations in mind I did some searching
to find a quick and easy alternative
to help me perform some data profiling for a project I was working on recently. I only had SQL Server 2005 available, and anyway most of my target source systems were Oracle, and of course I had short timescales. I looked at several options. Some never got beyond the download stage, they failed
to install or just did not run, and others provided less than I could have produced myself by spending 2 minutes writing some basic SQL queries. In the
end I settled on an open source product called DataCleaner.
To quote from their website: DataCleaner is an Open Source application for profiling, validating and comparing data. These activities help you administer and monitor your data quality in order
to ensure that your data is useful and applicable
to your business situation. DataCleaner is the free alternative
to software for master data management (MDM) methodologies, data warehousing (DW) projects, statistical research, preparation for extract-transform-load (ETL) activities and more. DataCleaner is developed in Java and licensed under LGPL. As quoted above it claims
to support profiling, validating and comparing data, but I didn’t really get past the profiling functions, so won’t comment on the other two. The profiling whilst not prefect certainly saved some time compared
to the limited alternatives. The ability
to profile heterogeneous data sources is a big advantage over the SSIS option, and I found it overall quite easy
to use and performance was good. I could see it struggling at times, but actually for what it does I was impressed. It had some data type niggles with Oracle, and some metrics seem a little strange, although thankfully they were easy
to augment with some SQL queries
to ensure a consistent picture. The report export options didn’t do it for me, but copy and paste with a bit of Excel magic was sufficient. One initial point for me personally is that I have had limited exposure
to things of the Java persuasion and whilst I normally get by fine, sometimes the simplest things can throw me. For example installing a JDBC driver, why do I have
to copy files
to make it all work, has nobody ever heard of an MSI? In case there are other people out there like me who have become totally indoctrinated with the Microsoft software paradigm, I’ve written a quick start guide that details every step required. Steps 1- 5 are the key ones, the rest is really an excuse for some screenshots
to show you the tool. Quick Start Guide Step 1 - Download Data Cleaner. The Microsoft Windows zipped exe option, and I chose the latest stable build, currently DataCleaner 1.5.3 (final). Extract the files
to a suitable location. Step 2 - Download Java. If you try and run datacleaner.exe without Java it will warn you, and then open your default browser and take you
to the Java download site. Follow the installation instructions from there, normally just click Download Java a couple of times and you’re done. Step 3 - Download Microsoft SQL Server JDBC Driver. You may have SQL Server installed, but you won’t have a JDBC driver. Version 3.0 is the latest as of April 2010. There is no real installer, we are in the Java world here, but run the exe you downloaded
to extract the files. The default Unzip
to folder is not much help, so try a fully qualified path such as C:\Program Files\Microsoft SQL Server JDBC Driver 3.0\
to ensure you can find the files afterwards. Step 4 - If you wish
to use Windows Authentication
to connect
to your SQL Server then first we need
to copy a file so that Data Cleaner can find it. Browse
to the JDBC extract location from Step 3 and drill down
to the file sqljdbc_auth.dll. You will have
to choose the correct directory for your processor architecture. e.g. C:\Program Files\Microsoft SQL Server JDBC Driver 3.0\sqljdbc_3.0\enu\auth\x86\sqljdbc_auth.dll. Now copy this file
to the Data Cleaner extract folder you chose in Step 1. An alternative method is
to edit datacleaner.cmd in the data cleaner extract folder as detailed in this data cleaner wiki topic, but I find copying the file simpler. Step 5 – Now lets run Data Cleaner, just run datacleaner.exe from the extract folder you chose in Step 1. Step 6 – Complete or skip the registration screen, and ignore the task window for now. In the main window click settings. Step 7 – In the Settings dialog, select the Database drivers tab, then click Register database driver and select the Local JAR file option. Step 8 – Browse
to the JDBC driver extract location from Step 3 and drill down
to select sqljdbc4.jar. e.g. C:\Program Files\Microsoft SQL Server JDBC Driver 3.0\sqljdbc_3.0\enu\sqljdbc4.jar Step 9 – Select the Database driver class as com.microsoft.sqlserver.jdbc.SQLServerDriver, and then click the Test and Save database driver button. Step 10 - You should be back at the Settings dialog with a the list of drivers that includes SQL Server. Just click Save Settings
to persist all your hard work. Step 11 – Now we can start
to profile some data. In the main Data Cleaner window click New Task, and then Profile from the task window. Step 12 – In the Profile window click Open Database Step 13 – Now choose the SQL Server connection string option. Selecting a connection string gives us a template like jdbc:sqlserver://<hostname>:1433;databaseName=<database>, but obviously it requires some details
to be entered for example jdbc:sqlserver://localhost:1433;databaseName=SQLBits. This will connect
to the database called SQLBits on my local machine. The port may also have
to be changed if using such as when you have a multiple instances of SQL Server running. If using SQL Server Authentication enter a username and password as required and then click Connect
to database. You can use Window Authentication, just add integratedSecurity=true
to the
end of your connection string. e.g jdbc:sqlserver://localhost:1433;databaseName=SQLBits;integratedSecurity=true. If you didn’t complete Step 4 above you will need
to do so now and restart Data Cleaner before it will work. Manually setting the connection string is fine, but creating a named connection makes more sense if you will be spending any length of time profiling a specific database. As highlighted in the left-hand screen-shot, at the bottom of the dialog it includes partial instructions on how
to create named connections. In the folder shown C:\Users\<Username>\.datacleaner\1.5.3, open the datacleaner-config.xml file in your editor of choice add your own details. You’ll see a sample connection in the file already, just add yours following the same pattern. e.g. <!-- Darren's Named Connections -->
<bean class="dk.eobjects.datacleaner.gui.model.NamedConnection">
<property name="name" value="SQLBits Local Connection" />
<property name="driverClass" value="com.microsoft.sqlserver.jdbc.SQLServerDriver" />
<property name="connectionString"
value="jdbc:sqlserver://localhost:1433;databaseName=SQLBits;integratedSecurity=true" />
<property name="tableTypes">
<list>
<value>TABLE</value>
<value>VIEW</value>
</list>
</property>
</bean>
Step 14 – Once back at the Profile window, you should now see your schemas, tables and/or views listed down the left hand side. Browse this tree and double-click a table
to select it for profiling. You can then click Add profile, and choose some profiling options, before finally clicking Run profiling.
You can see below a sample output for three of the most common profiles, click the image for full size.
I hope this has given you a taster for DataCleaner, and should help you get up and running pretty quickly.
