• IBM Consulting

    DBA Consulting can help you with IBM BI and Web related work. Also IBM Linux is our portfolio.

  • Oracle Consulting

    For Oracle related consulting and Database work and support and Migration call DBA Consulting.

  • Novell/RedHat Consulting

    For all Novell Suse Linux and SAP on Suse Linux questions releated to OS and BI solutions. And offcourse also for the great RedHat products like RedHat Enterprise Server and JBoss middelware and BI on RedHat.

  • Microsoft Consulting

    For Microsoft Server 2012 onwards, Microsoft Client Windows 7 and higher, Microsoft Cloud Services (Azure,Office 365, etc.) related consulting services.

  • Citrix Consulting

    Citrix VDI in a box, Desktop Vertualizations and Citrix Netscaler security.

  • Web Development

    Web Development (Static Websites, CMS Websites (Drupal 7/8, WordPress, Joomla, Responsive Websites and Adaptive Websites).

28 February 2013

Office 365 Business Launch

 Office 365 new launch:

REDMOND, Wash. — Feb. 27, 2013 — Microsoft Corp. today announced worldwide availability of a major new update to its Microsoft Office 365 services for business. Microsoft’s most complete Office cloud service to date has new features and offerings tailored to the needs and budgets of small, medium-size and large organizations. In addition to updated Microsoft Lync Online, Microsoft Exchange Online and Microsoft SharePoint Online services, business users can now get the rich Office applications they are familiar with, on up to five devices, delivered as an always up-to-date cloud service. Office 365 features enhanced enterprise social capabilities with SharePoint and Yammer today, and Lync-Skype connectivity for presence, instant messaging (IM), and voice by June. The new Office 365 service is available today in 69 markets and 17 languages and will be available in an additional 20 markets and 16 languages in the second quarter of this year.

“With Office 365, everyone from large enterprises to small businesses to individual consumers can now benefit from the power of Office and the connectivity of the cloud,” said Microsoft Office Division President Kurt DelBene. “This release unlocks new scenarios and delivers capabilities that far surpass anything available in browser-only solutions.”

Since launching in mid-2011, Office 365 is one of the fastest-growing businesses in Microsoft history. After only 18 months, one in five of Microsoft’s enterprise customers now has the paid service, up from one in seven a year ago. The number of small and midsize businesses using Office 365 has also grown by 150 percent in the past 12 months. Today Microsoft continued the wave of Office 365 momentum, announcing three new customers — Hamburg Port Authority, which manages operations for Europe’s second-largest port; Midroc Europe, a property development and management organization composed of 15 companies across Europe and South Africa; and Sephora USA Inc., a leading specialty beauty retailer. These customers join others that are choosing Office 365 across business, public sector and education, including the State of Texas, International Federation of Red Cross and Red Crescent Societies, Helly Hansen, Tesco, Toyota, Barilla America Inc. and the City of Chicago.

“For Hamburg Port Authority, our typical day on ships and in the harbor is different from most companies, as are our technology and business needs,” said Dr. Sebastian Saxe, chief information officer at Hamburg Port Authority. “Our workforce is mobile, so communication and access to information is critical for our 1,900 employees. Office 365 helps our team connect to the people and information that are important, while also reducing IT time on testing, installing and updating versions by 75 percent.”

“At Toyota, we always strive to provide innovative products and exceptional customer satisfaction. We needed to improve our productivity service to support our business speed and demands as well as improve collaboration across our affiliates,” said Karen Nocket, corporate manager, Toyota Motor Sales, USA, Inc. “We evaluated our options and found that Microsoft had the most robust, integrated suite with Office 365. It has the capabilities we need to excel in today’s business environment, such as email, calendaring, video, IM and document sharing. Microsoft Office 365 is enabling us to make faster, unified decisions across Toyota.”

More information on these customers and others is available at:

Customer stories

New Office 365 Offerings Tailored for Customer Needs

Today, Microsoft is announcing a new set of Office 365 offerings designed to meet a broad variety of business requirements:

Office 365 ProPlus. Office 365 ProPlus includes the latest and most complete set of fully featured, rich Office applications — Word, Excel, PowerPoint, OneNote, Outlook, Publisher, InfoPath and Access — delivered as a service, on up to five devices. People can now simply sign in to Office 365 from any of their devices, and their documents and personalized settings roam with them, allowing them to quickly pick up right where they left off. IT departments also get the controls they need, including the ability to run Office 365 ProPlus side-by-side with other versions of Office and tools to streamline and manage updates for their users. Office 365 ProPlus is available as a standalone offering for $144 per user for an annual subscription and is included with the updated premium Office 365 Enterprise offerings and the new Office 365 Midsize Business.

Office 365 Midsize Business. Office 365 Midsize Business is designed for medium-sized businesses with 10 to 250 employees. This service includes Office 365 ProPlus and provides midsize businesses with enterprise-quality communication and collaboration with Exchange Online, Lync Online and SharePoint Online — along with the simplified IT tools they need to maintain control while reducing complexity. Active Directory integration, a Web-based administration console and business-hours phone support are also included. Pricing is $180 per user for an annual subscription, the equivalent of $15 per user, per month.

Office 365 Small Business Premium. Office 365 Small Business Premium is designed for small businesses with one to 10 employees. In addition to the complete set of rich Office applications, this service includes business-grade email, shared calendars, website tools and HD videoconferencing capability in an easy-to-manage service that does not require IT expertise. Pricing is $150 per user for an annual subscription, the equivalent of $12.50 per user, per month.

The New Office Now Available for Everyone

slide show:


More than 10,000 people around the world told us how they spend their time.
It’s Time to Make the Most Out of Your Day
January 29, 2013
More than 10,000 people around the world told us how they spend their time.
Download: Web

With today’s general availability of Office 365 for all businesses, the new Office is now fully available to businesses, academic institutions and consumers. In addition to the business services announced today, on Jan. 29 Microsoft launched Office 365 Home Premium and updated versions of the traditional Office suite and servers.

Customers can purchase Office directly from Microsoft or through an authorized retail outlet or partner. More information on Office and how to sign up for a free trial is available at http://www.office.com.

Office for business product comparison

Microsoft Office 365 Enterprise Plans

For more information on implementation, reselling and support contact us at:

Drs. Albert Spijkers
DBA Consulting
web:            www.dbaconsulting.nl
blog:            DBA Consulting Blog
profile:         LinkedIn profile
Facebook :  DBA Consulting op Facebook
email:          albertspijkers@dbaconsulting.nl

Web Security with Oracle Enterprise Gateway


Oracle Enterprise Gateway

Oracle Enterprise Gateway is a purpose-built gateway product offering from Oracle, designed to simplify and secure SOA deployments on-premise, across domain boundaries or in the cloud. Oracle Enterprise Gateway secures, accelerates, integrates and routes XML and other types of data in a simple, easy-to-use manner to help significantly lower integration costs, lower costs of ownership and reduce deployment risks associated with SOA and Cloud infrastructures.

Oracle Enterprise Gateway helps streamline regulatory compliance through authentication, authorization and audit capabilities to dramatically simplify IT administration complexities. Oracle Enterprise Gateway also offers rich integration with various identity and access management platforms enabling enterprises to benefit from dependable security and streamlined policy compliance.

End-to-end SOA Security

DMZ-class security
Oracle Enterprise Gateway provides DMZ-class security and a comprehensive threat defense system at the service perimeter to SOA and Cloud environments, thus providing critical protection needed between un-trusted and trusted zones.

Accelerated XML processing
Oracle Enterprise Gateway provides accelerated XML processing allowing SOA and cloud applications to offload resource intensive XML based operations, resulting in significant performance gain by applications.

Certified on Oracle Fusion Middleware And Third-party Environments
Oracle Enterprise Gateway is fully integrated and certified with Oracle Fusion Middleware and offers out-of-the-box integrations with Oracle SOA Suite, Oracle SOA Governance Solution, Oracle Identity Management and Oracle Enterprise Manager.

SOA & Cloud Ready
Oracle Enterprise Gateway can be deployed in the cloud and can also mediate traffic in different data formats such as SOAP, REST, XML etc., thus simplifying SOA infrastructures on-premise or in the cloud. OEG also manages connections to the enterprise, partners and 3rd party cloud services.

Demo Orale Enterprise Gateway:

Oracle Enterprise Gateway Demo

Podcast Introducing Oracle Enterprise Gateway:

Introducing Oracle Enterprise Gateway

Why Oracle Enterprise Gateway:


  •     Provides an easier way to secure, accelerate and integrate XML and other types of data
  •     Significantly lowers integration costs, decreases total cost of ownership, and 
  •     reduces deployment risks
  •     Offers rich integration with many identity and access management platforms
  •     Helps streamline regulatory compliance through authentication, authorization, 
  •     and audit capabilities


  •  Delivers critical protection needed between untrusted and trusted zones by providing 
  • DMZ-class security and a comprehensive threat defense system at the service perimeter to  SOA and cloud environments
  • Improves application performance by providing ultra-fast XML processing, allowing SOA and cloud applications to offload resource intensive XML-based operations
  • Offers out-of-the-box integrations with Oracle SOA Suite, Oracle SOA governance solution, Oracle Identity Management, and Oracle Enterprise Manager
  •  Secures and improves efficiency of SOA infrastructures on-premise or in the cloud by mediating traffic in different data formats such as SOAP, REST, XML, and others
  •  Manages connections to the enterprise, partners, and third-party cloud services

Oracle Enterprise Gateway Architecture and Components

Oracle Enterprise Gateway is available as a single executable for the Microsoft Windows, Linux, and Oracle Solaris platforms.

As mentioned previously, in a typical deployment scenario Oracle Enterprise Gateway components are deployed in the DMZ. The connection between clients and Oracle Enterprise Gateway is protected by a perimeter firewall, and the connection between Oracle Enterprise Gateway and target web services is protected by a Network Address Translation (NAT) firewall.

For more information read this White Paper:

Oracle Enterprise Gateway White Paper

There is also a stress test available for the Oracle Eneterprise Gateway:

Stress Test for Oracle Enterprise Gateway Service Explorer
By pgoutin on May 25, 2011

This test description demonstrates how to deal with StressTest using OEG Service Explorer

Oracle Enterprise Gateway Stress Test Creation for the StockQuoteService (axis2 implementation) with XML Threat Policy Policies.

  •     Testing the StockQuoteService using OEG Service Explorer
  •     Create a Stress Test to send a set of the same request to the OEG gateway
  •     Add a second request in the test loop
  •     Real-Time service monitoring with OEG Service Monitor


  •  OEG Virtualbox image from OEG bootcamp training running and Oracle standard laptop with 4GB memory.
  • Allocate 1 or 2GB to the OEG Virtualbox image


The complete tutorial is available here:

Oracle Enterprise Gateway Stress test White Paper

For more information please contact me at:

Drs. Albert Spijkers
DBA Consulting
web:            www.dbaconsulting.nl
blog:            DBA Consulting Blog
email:          albertspijkers@dbaconsulting.nl

26 February 2013

Oracle Database 12c New Database release.

Oracle Database 12c is scheduled to release quite soon this year according to rumors.

At the end of this Blog the are a few expected new features amongst which a Multi-tenant Database approach, what is a multi-tenant Database, a not really totally new concept as described by Microsoft below:

Multi-tenancy introduction

Trust, or the lack thereof, is the number one factor blocking the adoption of software as a service (SaaS). A case could be made that data is the most important asset of any business—data about products, customers, employees, suppliers, and more. And data, of course, is at the heart of SaaS. SaaS applications provide customers with centralized, network-based access to data with less overhead than is possible when using a locally-installed application. But in order to take advantage of the benefits of SaaS, an organization must surrender a level of control over its own data, trusting the SaaS vendor to keep it safe and away from prying eyes.
To earn this trust, one of the highest priorities for a prospective SaaS architect is creating a SaaS data architecture that is both robust and secure enough to satisfy tenants or clients who are concerned about surrendering control of vital business data to a third party, while also being efficient and cost-effective to administer and maintain.
This is the second article in our series about designing multi-tenant applications. The first article, Architecture Strategies for Catching the Long Tail, introduced the SaaS model at a high level and discussed its challenges and benefits. It is available on MSDN. Other articles in the series will focus on topics such as workflow and user interface design, overall security, and others.
In this article, we'll look at the continuum between isolated data and shared data, and identify three distinct approaches for creating data architectures that fall at different places along the continuum. Next, we'll explore some of the technical and business factors to consider when deciding which approach to use. Finally, we'll present design patterns for ensuring security, creating an extensible data model, and scaling the data infrastructure.

Three Approaches to Managing Multi-Tenant Data
The distinction between shared data and isolated data isn't binary. Instead, it's more of a continuum, with many variations that are possible between the two extremes.

 Data architecture is an area in which the optimal degree of isolation for a SaaS application can vary significantly depending on technical and business considerations. Experienced data architects are used to considering a broad spectrum of choices when designing an architecture to meet a specific set of challenges, and SaaS is certainly no exception. We shall examine three broad approaches, each of which lies at a different location in the continuum between isolation and sharing.

Separate Databases
Storing tenant data in separate databases is the simplest approach to data isolation.


Figure 1. This approach uses a different database for each tenant
Computing resources and application code are generally shared between all the tenants on a server, but each tenant has its own set of data that remains logically isolated from data that belongs to all other tenants. Metadata associates each database with the correct tenant, and database security prevents any tenant from accidentally or maliciously accessing other tenants' data.
Giving each tenant its own database makes it easy to extend the application's data model (discussed later) to meet tenants' individual needs, and restoring a tenant's data from backups in the event of a failure is a relatively simple procedure. Unfortunately, this approach tends to lead to higher costs for maintaining equipment and backing up tenant data. Hardware costs are also higher than they are under alternative approaches, as the number of tenants that can be housed on a given database server is limited by the number of databases that the server can support. (Using autoclose to unload databases from memory when there are no active connections can make an application more scalable by increasing the number of databases each server can support.)
Separating tenant data into individual databases is the "premium" approach, and the relatively high hardware and maintenance requirements and costs make it appropriate for customers that are willing to pay extra for added security and customizability. For example, customers in fields such as banking or medical records management often have very strong data isolation requirements, and may not even consider an application that does not supply each tenant with its own individual database.

Shared Database, Separate Schemas

Another approach involves housing multiple tenants in the same database, with each tenant having its own set of tables that are grouped into a schema created specifically for the tenant.


Figure 2. In this approach each tenant has its own separate set of tables in a common database

When a customer first subscribes to the service, the provisioning subsystem creates a discrete set of tables for the tenant and associates it with the tenant's own schema. You can use the SQL CREATE command to create a schema and authorize a user account to access it. For example, in Microsoft SQL Server 2005:


The application can then create and access tables within the tenant's schema using the SchemaName.TableName convention:

CREATE TABLE ContosoSchema.Resumes (EmployeeID int identity primary key, Resume nvarchar(MAX))

After the schema is created, it is set as the default schema for the tenant account:


A tenant account can access tables within its default schema by specifying just the table name, instead of using the SchemaName.TableName convention. This way, a single set of SQL statements can be created for all tenants, which each tenant can use to access its own data:


Like the isolated approach, the separate-schema approach is relatively easy to implement, and tenants can extend the data model as easily as with the separate-database approach. (Tables are created from a standard default set, but once they are created they no longer need to conform to the default set, and tenants may add or modify columns and even tables as desired.) This approach offers a moderate degree of logical data isolation for security-conscious tenants, though not as much as a completely isolated system would, and can support a larger number of tenants per database server.
A significant drawback of the separate-schema approach is that tenant data is harder to restore in the event of a failure. If each tenant has its own database, restoring a single tenant's data means simply restoring the database from the most recent backup. With a separate-schema application, restoring the entire database would mean overwriting the data of every tenant on the same database with backup data, regardless of whether each one has experienced any loss or not. Therefore, to restore a single customer's data, the database administrator may have to restore the database to a temporary server, and then import the customer's tables into the production server—a complicated and potentially time-consuming task.
The separate schema approach is appropriate for applications that use a relatively small number of database tables, on the order of about 100 tables per tenant or fewer. This approach can typically accommodate more tenants per server than the separate-database approach can, so you can offer the application at a lower cost, as long as your customers will accept having their data co-located with that of other tenants.

Shared Database, Shared Schema

A third approach involves using the same database and the same set of tables to host multiple tenants' data. A given table can include records from multiple tenants stored in any order; a Tenant ID column associates every record with the appropriate tenant.

Figure 3. In this approach, all tenants share the same set of tables, and a Tenant ID associates each tenant with the rows that it owns

Of the three approaches explained here, the shared schema approach has the lowest hardware and backup costs, because it allows you to serve the largest number of tenants per database server. However, because multiple tenants share the same database tables, this approach may incur additional development effort in the area of security, to ensure that tenants can never access other tenants' data, even in the event of unexpected bugs or attacks.
The procedure for restoring data for a tenant is similar to that for the shared-schema approach, with the additional complication that individual rows in the production database must be deleted and then reinserted from the temporary database. If there are a very large number of rows in the affected tables, this can cause performance to suffer noticeably for all the tenants that the database serves.
The shared-schema approach is appropriate when it is important that the application be capable of serving a large number of tenants with a small number of servers, and prospective customers are willing to surrender data isolation in exchange for the lower costs that this approach makes possible.

So now we know what muli-tenancy is, is Microsoft the only one using this concept already? 

Not really also IBM whit is DB2 Database is already ahead of the multi-tenancy game:


Multi-tenancy at the data layer using DB2 can be used in various situations as discussed in the next six cases. Also keep in mind that if you are a small company and want to reduce licensing costs, you can consider using the no-cost version ofDB2: DB2 Express-C. DB2 Express-C does not have any limits for the database size. 

Case 1: Sharing tables

In this case, the following resources are shared:      

  • The database server

  • The DB2 instance

  • The database

  • One or more table spaces

  • One or more tables

Figure below shows an overview of the shared resources in this case. The inventory, customers, and orders tables have information from the clients of the various tenants.


The advantages of this case are that it provides the lowest cost, lowest storage, minimum amount of DB2 licensing, and minimum number of cloud instances needed.

The main disadvantage is that if, for example, one table becomes corrupted, it affects all customers. Also, application complexity might also be added in trying to always determine in your queries which records to retrieve for a given tenant.

Case 2: Sharing a database

In this case, the following resources are shared:

  • The database server
  • The DB2 instance 
  • The database

Figure below shows an overview of the shared resources in this case.



In this case, the benefits are that sharing a database is still relatively low in cost in terms of still using one DB2 license and one cloud instance. Data isolation is good since different set of tables is used. Customization from a data perspective is easier since every tenant gets its own set of tables.

The disadvantages are that more storage is required since you need to create one set of the same tables per tenant. So comparing to case 1, you would be using x times more of storage, where x is the number of tenants. The application complexity is also increased and not as flexible, since now you need to customize your application to handle different table names and potentially different table structure in case there is specific customization for a tenant.

Case 3: Sharing a database and using a different schema name

In this case, the following resources are shared:
  • The database server
  • The DB2 instance
  • The database

Figure below shows an overview of the shared resources in this case.



Under this case, the benefits are that it is still low in cost, almost the same as in case2. You still need one DB2 license and one cloud instance. Data isolation is good because a separate set of tables is used. Compare to case 2; there is less complexity in the application because the SQL statements used can be exactly the same. Redirecting a query to a given set of tables, is done by changing the schema name, by using the SET SCHEMA command. Customizations of a given table will obviously add complexity to your application.

The disadvantage, as in case 2, is that you must still use more storage because you would be creating one set of tables per tenant.

Case 4: Sharing an instance

In this case, the following resources are shared:
  • The database server
  • The DB2 instance
Figure below shows an overview of the shared resources in this case.


In this case, the benefits are that it is still low in cost, almost the same as in case 2.You would still need one DB2 license and one cloud instance. Data isolation is very good because each tenant gets its own database, which in DB2 is an independent unit. Each database can be configured and maintained independently, providing more flexibility. The application complexity is less than in case 1. The table structure for most tables will be the same in all databases. If customization is required for one tenant, the table definition can be altered, but this adds complexity to the application.

The disadvantage is that you will need more storage. Each database in DB2 creates its own catalog, which in other database products is known as the dictionary; therefore, more tables, views, and other database objects from the system must be created. In addition, in the case of DB2, there is a limit of 256 active databases per instance; therefore, under this scenario, only 256 tenants could work concurrently. Another disadvantage is that your memory consumption also increases, which can be troublesome on two fronts:
  • You might reach the memory limit of the DB2 edition you are using, and will have to purchase a more expensive DB2 edition.
  • You might reach the memory limit in your cloud instance, in which case, you will need to choose a more expensive cloud instance.

Case 5: Sharing a database server

In this case, only the database server resource is shared. Figure below shows an overview of the shared resources in this case.


In this scenario, each tenant gets its own DB2 instance. The first benefit is good access control. Application complexity is similar to case 4. However, the system administrator might have to configure connectivity parameters appropriately in all the instances, which can mean more work to do. The table structure for most tables is the same and, as in case 4, for a given tenant, you can customize some tables, but application changes are required. Another benefit is that each instance and database can be maintained independently. If you bring down one instance, it affects only one tenant.

With respect to disadvantages, again, you see more storage required than in other cases, and you can also encounter problems with respect to memory. Although the number of instances in DB2 is limited by the operating system limits, and although starting an instance does not consume a lot of memory, having many instances started with several databases active at the same time might still cause memory problems. As a result, you could be forced to change your DB2 edition to a more expensive one or change your cloud instance to a larger, more expensive one. In addition to these disadvantages, administration complexity will also increase, which might warrant the company hiring more resources and directly affect costs.

Case 6: Sharing a database server with multiple DB2copies

In this case, only the database server resource is shared. Figure below shows an overview of the shared resources in this case.


For the purpose of a SaaS, there are really no benefits in using this approach. In terms of disadvantages, there are several:
  • More copies of the DB2 code must be stored in your cloud instance, taking up space.
  • You have to install and configure DB2 for each copy installed; therefore, there is more administration setup time required.
  • More application complexity exists, and this type of environment can confuse developers as to which database to connect in which instance of which DB2copy.
  • It has similar issues as case 5 for memory and storage consumption. 

In summary, this case has no real benefit, but it has been added in this article for thoroughness.

, and then finally, what is was all about, the new release of Oracle 12c (or 12g, whatever the name will be), can be seen as a Cloud Ready Database with lots of new features, of which a few are mentioned here below, for more accurate list of features I refer to Oracle it self after the release date, somewhere this year the romuors have it.

Oracle 12c new features

Oracle is planning to release its latest version Oracle 12c which would be

a cloud based database management system. Please be aware that Oracle 12c has not been officially announced yet and so no decisions should be made on below features. I have consolidated it from various sources.

1. Pluggable Database 

DBAs will be able create multiple pluggable databases (PDB) that sits
within a single database container. Each PDB will have its own metadata and
private data files. It will be easy to apply patches for all databases by
patching only one container database. Backup and recovery efforts are less
since DBAs can maintain each PDB separately. PDBs are ideal for creating
development and test environments.

2. VARCHAR2 length up to 32767

This one will be one of the best feature for developers who always struggle
to manage large chunk of data. Current version of databases allows only
up to 4000 bytes in a single varchar2 cell. So developers has to either use
CLOB or XML data types which are comparatively slower that varchar2

3. Default value can reference sequences

This is also for developers who struggle to maintain unique values in
Primary Key columns. While creating a table default column can be
referenced by sequence.nextval.

4. Top-N feature

As like MySQL(limit clause), Oracle 12c will allow Top-N feature in
queries. Analytical function improvements.


5. PL/SQL Unit Security

A role can be granted to a code unit, say Procedure,Function,Package etc.

6. With Clause improvement

Functions can be created with SQL having WITH clause.

7. Duplicate Indexes  

Create duplicate indexes on the same set of columns. Like in large
applications you might want two different types of index on the same data.

8. Boolean in SQL

As of Oracle 11g Boolean is not a supported data type in SQL and 12c you can
enjoy this feature.

9. Implicit Result Sets

Ref Cursors can be directly open in side program units. No need to use
Oracle collection to handle ref cursor separately.

10. Transaction Guard

Transaction can be marked as “unknown” where transactions outcome is
not known.  This will safe guard duplicate submission of successful transactions.

Few more features as bullet points. More details yet to come
  •  Asynchronous Global Index maintenance for DROP and TRUNCATE.
  •  Cascade for TRUNCATE and EXCHANGE partition.
  •  Multiple partition operations in a single DDL.
  •  Online move of a partition (without DBMS_REDEFINTIION).
  •  Interval + Reference Partitioning.
  •  Adaptive Execution/statistics Plans.
  •  STATISTICS COLLECTOR steps in the SQL Trace.
  •  Global temporary tables can have “session private statistics”.
  •  Temporary Undo for temporary tables.

For more new features and last minute information I refer to Oracle and form Migration support and Database Maintenance please contact me at:

Drs. Albert Spijkers 
DBA Consulting 
web:           www.dbaconsulting.nl 
blog:           DBA Consulting blog 
profile:       LinkedIn Profile