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Blogs from PlanetDB2.com

How to block database connections

During a recent consultation there was a requirement to block DB2 LUW database connections. The purpose was to test monitoring alerts and assess the correct response when a database connection could not be established. The requirement was to maintain the DB2 instance active and all the other databases as online An easy way to block database connections is to use the MAXAPPLS database configurable. This parameter specifies the maximum number of concurrent applications that can be connected (both local and remote) to a database. The trick is to set the DB2 LUW database MAXAPPLS configurable to 1, and ensure that...

What the Null? Handling Missing Information in Database Systems

In relational database systems, a null represents missing or unknown information at the column level. A null is not the same as 0 (zero) or blank. Null means no entry has been made for the column and...

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A Happy 10 Years

Ten years ago this week--July 16, 2007, to be specific--this blog published its first post, on Universal Table Space. IBM Systems Magazine had asked me if I would consider writing a blog about Db2 for z/OS. I'm not exaggerating when I say I felt like the luckiest guy in the world.

The IBM z14: There's a New Mainframe Coming!

Today, July 17, 2017, IBM announced the next iteration of its stalwart mainframe hardware, the IBM z14. The news comes a little more than two years since the previous version, the IBM z13. The hardware will be generally available later this year. The big news is that IBM delivering pervasive encryption as part of the IBM z14. With pervasive encryption you can encrypt and protect all...

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Chatbots: Testing Contexts

Watson Conversation Tool in action Some weeks ago I blogged about a tool I wrote for the IBM Watson Conversation Service (WCS). It allows you to manage your conversation workspaces from the command...

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