PostgreSQL

Quick Tip – PostgreSQL Equivalent of ISNUMERIC()

Very much like my previous MySQL ISNUMERIC() post I have recently been setting up a data source to collect records with telephone numbers from a Postgres database and one of the essential validation tests is to make sure that the field really does contain a number.

Despite the fact that many regard Postgres as the best open source database platform I find myself frustrated by it’s lack of standard functions.  I understand that Postgres is designed to be extensible and that user defined functions can be built but I need my code to be both portable and read-only so I have to work with what I’m given.  Ideally what I’d be looking for is an equivalent of Microsoft SQL Server’s ISNUMERIC() or Excel’s ISNUMBER() functions but very much like MySQL I had to turn to regular expressions although as you’ll see, Postgres does not have a clean and clear REGEXP() function…

SELECT DISTINCT contact_number
FROM customers
WHERE (contact_number ~ ‘^[0-9]+$’)

I hope that helps any of you out there that encounter the same problem, thanks to the poster here for my original answer.

Loading Data into MySQL with SSIS via ODBC (sql_mode = ANSI)

I was performing a test earlier, a proof-of-concept to show that we could use Integration Services to move data from one platform (PostgreSQL) to another (MySQL) without SQL Server itself being involved at all. 

Unfortunately I hit a slight snag on the first simple attempt, I could read the data without a hitch but despite multiple attempts at tweaking SSIS settings and reconfiguring connections I could not manage to get data into the MySQL target table.  Amongst other messages in the Output window in BIDS I could see the following error…

[MySQL][ODBC 5.1 Driver][mysqld-5.0.45-log]You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘”tblDestination” (“col1″, “col2″, “col3″, “col4″, “col5″, “c’ at line 1

After some Googling I determined that the issue was down to an incompatibility between the SQL being generated by SSIS and the default MySQL engine, specifically that MySQL was not setup to accept ANSI compliant SQL.  Most of the solutions out there seemed to require that the entire server was configured in the ANSI compliant mode which was a problem for me as it’s a shared server and I can’t go reconfiguring it at will.  Thankfully MySQL provides the ability to set the mode on a per connection level with the following command…

SET SESSION sql_mode= 'ansi';

The trick is – how to get SSIS to run this before inserting the data without messing with the package itself?  The easiest way is to have the ODBC driver send the command at the point SSIS opens the connection, this can be configured in the settings of the ODBC source…

This is a relatively common feature of ODBC drivers and allows you to setup initial configuration options for this exact reason, now I know that I will not impact any other users of the server and my SSIS package works just fine.

Using SQL Server 2008 R2 Linked Servers with PostgreSQL 64-bit

Having setup a Linked Server in Management Studio talking to a PostgreSQL 8 database I encountered the following error when attempting to run any valid query:

Msg 7399, Level 16, State 1, Line 1
The OLE DB provider "MSDASQL" for linked server "PG_SERVER" reported an error. The provider reported an unexpected catastrophic failure.
Msg 7350, Level 16, State 2, Line 1
Cannot get the column information from OLE DB provider "MSDASQL" for linked server "PG_SERVER".

After some digging I came across a handy article on Microsoft Connect describing the same issue, with thanks to Nenea Nelu here’s the solution…

• Expand Server Objects > Linked Servers > Providers. 
  
• Right-click on MSDASQL and select Properties…
• In the Properties dialogue un-check “Allow inprocess” as follows…
  
• Click OK and re-run your query. 

Hopefully that should solve your problem, please note that this will affect all Linked Servers using that provider however as the Connect article points out – this is best practice for linked servers anyway.

Trends in Business Intelligence & 2010 Review

It’s the time of year when magazine editors can’t resist the urge to fill their glossy wares full of ‘thing of the year’ articles, the print equivalent of the mid-season “clip show” that has plagued many a TV series.  Well, if it’s good enough for them it’s good enough for me so here’s my rather unstructured and unscientific take on Business Intelligence and Data Warehousing in the year that was – 2010…

Market Trends

To start, I’ve taken a series of snapshots from the excellent Google Trends showing global search volumes for each of the Big Four offerings to measure the level of interest.  It’s reasonably clear to see from the graph below that interest in OBIEE shows a small but steady growth whilst Reporting Services shows a marked decline and the other two offerings remains roughly static (maybe a small decline?), this surprised me given that with the release of 2008 R2 I think that Reporting Services is really getting to the point where it offers a legitimate choice in the BI marketplace.  Perhaps the issue that Microsoft have fragmented their BI offering to include a mixture of terms with Excel, PowerPivot, SharePoint, Analysis Services and Reporting Services all making up the BI stack and nobody really knows what to call it?

This year has also brought an increased emphasis on Mobile BI with the iPad and iPhone fast becoming common executive playthings, Business Objects making it’s Explorer and Xcelsius products available on Android in addition to the iPhone (Explorer only).  MicroStrategy took the mobile emphasis a step further (perhaps to help stick their head above the crowd) by announcing a strong focus on the mobile BI market and offering a free 25-seat licence for their Mobile Suite.  Despite a strong focus on marketing Mobile BI I’m still not convinced that any of the vendors have really hit the nail on the head with their solutions in that whilst many offer pretty visualisations and slick interfaces most seem to lack the kind of simplicity that helps to present information quickly and succinctly, even the frankly beautiful independent product RoamBI just feels a little overdone when it comes to actually using it.

Major Product Releases

It’s been quite a year in the BI & Database world with the launch of Microsoft SQL Server 2008 R2, Oracle Business Intelligence Enterprise Edition (OBIEE) 11g and IBM’s Cognos 10…

Microsoft’s launch is effectively a moderate evolution of SQL Server 2008 in most areas with little change to the database engine, it’s ETL tool Integration Services and it’s OLAP engine Analysis Services.  That said, R2 did bring some handy incremental features which will be especially welcomed by the budget-conscious with an increase in the DB size of the free Express Edition from 4GB to 10GB and the addition of Backup Compression to Standard Edition.  There were some interesting additions with PowerPivot, Master Data Services and StreamInsight thought I’m not sure that either will find a natural home for a good year or so as busy DBAs and developers struggle to find the time to try these new features out.

Despite the major jump in the version number Oracle’s release too seems to be mainly an evolution and as a great fan of the product I’m quite considerably relieved since Oracle could quite easily have been over-zealous in integrating their ‘own’ tools like Discoverer and Warehouse Builder with bought-in technologies like Siebel Analytics (which became the bedrock of OBIEE), Hyperion’s Essbase and Sunopsis (now Oracle Data Integrator).  One of the less exciting but fundamentally important additions is that the semantic layer employed in OBIEE will be directly and immediately compatible with future releases of other Oracle products in the CRM, ERP and Finance application spaces.

I’m not as familiar with Cognos as the other two tools having only experimented with Cognos 8 for a couple of weeks but from everything I’ve read it seems that Cognos 10 was certainly a major milestone in the product’s lifecycle.  Aside from the shiny sounding features such as Social Networking and iPad support (actually a very serviceable looking mobile BI app) there are some very cutting-edge additions to the product including a statistical engine drawn from SPSS and Active Reports which allows users to explore and analyse offline data including interactive email reports.

The Future?

No good review and roundup article ends without a nod to the future and whilst I’m not keen on making absolute predictions there are a few developments I’ll be keeping my eye on for 2011 and beyond.

The main event I’m anticipating is the release of Business Objects XI Release 4, I’ve not seen too many concrete details about functionality but over the last few years Business Objects have seen themselves distracted by the Crystal acquisition (including the shoe-horning of their core product into Crystal Enterprise) and in turn their acquisition by SAP.  As a regular and long-term user of Business Objects I’m really hoping that they’ll blow away some of the cobwebs and deliver some new functionality as well as rounding off some of the edges that in previous versions feel a little unfinished, it would be great too if they finally included the key functionality from the legacy desktop client (which many long-term customer still rely on) in their core Web Intelligence product (Freehand-SQL & Grouping – I’m looking at you).

Another area to watch in Business Intelligence and Data Warehousing as well as the wider enterprise market is cloud computing, Informatica’s ETL in the Cloud offering has seen improvements and adoption throughout 2010 and it’s almost a given that Microsoft will be adding some degree of ETL capability to their SQL Azure platform. I’d expect an announcement if not a release along these lines in the coming year, though it’s possible that ETL comes behind providing cloud based analytics (something SSIS guru Jamie Thomson suggests).

In a broader sense I’m expecting to see a little more interest and pickup in the open source BI market, I’ve been saying this for a while (“this time next year, Rodders…“) and I might be wrong for some time to come but I always keep an eye on companies using an Open Source model such as the ETL vendor Talend who recently acquired Sopera (a middleware and SOA vendor), BI vendor Jaspersoft and all-rounder Pentaho.  With the global economy still suffering a hangover from the sub-prime mortgage crisis and banking collapse people have been looking for cheaper alternatives and open source companies provide a great way to achieve that, though some of Talend’s high-end offerings are almost comparable in price with other commercial products.

Another possible area to watch out for is the area of Personal Intelligence, essentially Business Intelligence for the individual.  A colleague and I spoke about this back in 2008 and we could both see that as people increasingly become data-aware they’ll start to look inwards and aim to measure things about themselves, one obvious starting point is fitness and we already have sites to log and chart your weight and calorie intake as well as the brilliant Nike+ product that measures your pace, time and distance during a run using either a sensor in your shoe or GPS (iPhone app), see the sidebar of this blog or below (one of my runs on the Nike+ site) for examples of the output.