Category: News from the labs

Each month, SEG sends out valuable technical DB2 z/OS information based on knowledge gained by the experienced developers and technicians in our product labs. We would like to share this newsletter with other DB2 users, like yourself.

2019-10 DECFLOAT examples: Fun with Numbers

Find Db2 Decfloat examples (SNAN, NAN, INF), invalid DECFLOAT and some solutions as CAST or capturing the SQL workload / capturing SQLCODES.

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2019-09 A DBA has got to know his limitations

Know the most important Space limitations in Db2 and how to check them to avoid being out of extent thanks to a real-time space monitor small tool

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2019-08 FTB (Fast Traversal Block): Just another TLA?

Learn how FTB (Fast Traversal Block) supports Db2 Fast Index Traversal (FIT) to allow Index performance optimization and CPU saving since Db2 12

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2019-06 A little quote from Terry Purcell: It just takes one

One single SQL statement can bring your entire system to its knees: this quote from Terry Purcell is illustrated with a real case at one customer site.

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Machine Learning for Db2 z/OS: Artificial Intelligence – Hype or Reality?

Machine learning for db2 review, now that the Db2 Optimizer has gone all Artificial Intelligent (AI).

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2019-04 ZOWE for Continuous Delivery – It’s worse than that – he’s tested Jim!

With this Db2 12 testing checklist, be ready to navigate into the Db2 Continuous Delivery world, well supported by Zowe, the modern IBM z/OS GUI

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2019-03 EXPLAIN data review

Db2 EXPLAIN example: a quick history of EXPLAIN and a new standard Db2 EXPLAIN Query to bring out the best and most underused columns.

2019-02 Global Temporary Confusion

Learn, through examples, why CGTT (CREATEd Global Temporary Tables) are possibly better than DGTT (DECLAREd Global Temporary Tables) and how to use them to speed up performance.

2019-01: Regular Expressions in Db2 SQL – Regulate this!

Impress your JAVA colleagues with Regular Expressions in Db2 SQL – Become a regex specialist with these samples (regex usage in the TSO Editor & regex as a predicate).
The references to blogs focusing on this topic (advanced pattern matching, regex testing and REGEXP_LIKE usage) will help round out your knowledge all about “Regular Expressions in Db2 SQL”.

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2018-12: Db2 Checklist – SQLCODEs as never seen before

With this SQLCODE list, from the “bad guys” through to the “odd guys” – e.g. the SQLCODE 100 – and then onto the “not so bad guys”, you can see a practical list of current SQLCODEs in production from around the globe, including their meaning. This review also analyzes the behaviour of some SQLCODEs and proposes some solutions to get your Db2 z/OS programs correctly processing these SQLCODEs.

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