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ChannelDB2 is a social network for the DB2 community. It features content such as DB2 related videos, podcasts, blogs, photos, resources, etc. for Linux, UNIX, Windows, System z, and System i.

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Blogs from PlanetDB2.com

The New z/14 and Pervasive Encryption

Last week IBM unveiled the newest mainframe system--the z14. As noted in the announcement letter, the z14 is intended to provide the cornerstone for the "trust economy."

Db2 12 for z/OS SQL Enhancements: Result Set Pagination

In this second of a series of entries on my favorite SQL-related enhancements provided via Db2 12 for z/OS (and "Db2," versus "DB2," is officially the new form of the product name), I will describe useful functionality pertaining to result set pagination (my first post in this series covered piece-wise DELETE). "Result set pagination" refers to retrieval of a query result set in "pages," with each page including a sub-set of the result set's rows. A typical scenario might involve presentation...

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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.

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