Yesterday I posted a brief piece about the new version of Db2 for z/OS that is now generally available: Db2 13 for z/OS is Here! It is always an exciting time when a new version of Db2 for z/OS is unleashed on the world and one of the first things I re…
Back in 2014, I posted an entry to this blog on the topic of getting to universal table spaces from non-universal table spaces. In that entry, I noted that there was an online path (ALTER followed by online REORG) for getting from a “classic” partition…
Sometimes, a DBA will email me a question about Db2 for z/OS, and I’ll respond in a pretty comprehensive way, and I’ll look at that outbound message and think to myself, “Hmm. I may have written most of a blog entry there.” This is one of those ca…
As a Db2 consultant and regular blogger I often receive questions about technical things, but also on strategy and industry trends. I try to help but I always make it clear when answering that I cannot predict the future, only make educated guesses… …
One of the constant struggles with Db2 development, and indeed developing for any relational DBMS, is designing and creating appropriate indexes. Perhaps the most important thing you can do to assure optimal application performance when accessing data …
I have written a few entries for this blog in which I provided information about Db2 for z/OS buffer pools defined with PGSTEAL(NONE), including one from a few years ago in which I differentiated the PGSTEAL and PGFIX buffer pool specifications, and another...
In my last post, I wrote an overview of running Db2 in containers. Today, I’d like to talk a bit about where we get Db2 containers and several common ways they are used. Catch my next post about a critical mistake I think IBM is making with containerization. Ways...
There’s a reason why database administration or engineering remains a separate specialty. There are a large number of rabbit holes you can go down. I’m well aware that there’s probably 40% of Db2 LUW alone that I don’t know, even though I’ve spent 20 years working...
Your Db2 database The IBM mainframe and its Db2 database is the transaction processing workhorse for the world’s biggest banks, insurers and financial services companies. It was designed to execute their high-intensity transaction processing workloads very...
The EXPLAIN functionality of Db2 for z/OS, by which the query optimizer's access path determinations are externalized, has been around as long as I can remember, and Db2 people, by and large, are familiar with the concept. In recent weeks, however, I discovered that...
