Triton Db2 Geek

Confessions of a DB2 geek

IBM Gold Consultant Program and IBM Premier business Partner

Tag Archives: IBM Champion

Finding the access path for Columnar queries #2

Published November 8th, 2017 - by

Usage Lists In my last blog ( http://db2geek.triton.co.uk/finding-access-path-columnar-queries ) I was reiterating the case for columnar data storage but bemoaning the lack of any means to see in the access path how the data is being retrieved. It merely shows as a table scan (TBSCAN) and you need to trust that what is going on Continue Reading

Finding the access path for Columnar queries

Published October 18th, 2017 - by

Columnar Data : how it works We’re probably all fairly familiar now with BLU acceleration and the advantages of storing analytical data in a columnar format. If not, and by way of a recap; what we can now do is return much smaller results sets to our analytical queries, in a highly-compressed format, thereby reducing Continue Reading

Do the Needful

Published July 19th, 2017 - by

So the last few blogs have been a bit negative and have been built around common expressions and assumptions that make my hackles rise (If it ain’t broke, don’t fix it, We’re Risk Averse and Best Practice). Now this is the blog with the positive spin, so it might seem strange that I’m hanging it Continue Reading

MVM Eases DB2 for z/OS Upgrade Anxiety

Published April 19th, 2017 - by

On 14th February 2017, IBM quietly announced a new software charging mechanism that could have some very positive implications for most System z sites – including DB2 for z/OS customers. MVM (Multi-Version Measurement) replaces the old Single Version Charging (SVC) arrangement, and promises to do away with many of the restrictions that IBM previously imposed Continue Reading

In-Line Optimization with V11.1

Published April 7th, 2017 - by

Sometimes you might find that the Optimizer has chosen an access path with which you don’t concur. It’s not that likely, as the DB2 Optimizer is one of the most sophisticated of its ilk, but it’s possible that you may know something that the optimizer doesn’t: if, for instance, a table has just had some Continue Reading

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