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    June 17, 2020 Jonathan Gnagy

    Disappearing Data in PostgreSQL

    I recently discovered an interesting (and frustrating) issue while running PostgreSQL in Kubernetes. While the issue technically isn’t specific to Kubernetes, per se, it is certainly easy to encounter in Kubernetes for users of the official PostgreSQL Docker image (and many other images) mounting volumes somewhere other than the default location.… Read the rest

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  • January 21, 2020 Ember Crooks

    SQL+RDBMS Basics: What is a Commit?

    This post is cross-platform and applies to all RDBMSes.

    It is interesting to see, as a person experienced with a technical tool, some of the disadvantages of the newer ways of learning technical topics. When I started in IT, you learned some of the concepts in college, you learned some things working on the job with other DBAs who knew what they were doing, and you filled in the gaps by going to week-long classes once a year to get some detailed and hands-on official training.… Read the rest

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  • January 2, 2020 Ember Crooks

    Packaging and Licensing of Db2 for LUW – Version 11.5

    Edit 2020-01-02: corrected limit for free Db2 on Cloud to the correct 200 MB. Original text is still in the document, in strikeout.

    This is one of the few blog entries where I include the Db2 version number right in the title.… Read the rest

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  • December 17, 2019 Ember Crooks

    Practice Good Documentation

    Having worked on teams of Db2 DBAs, largely in consulting roles, the value of good documentation is huge. This is once again clear to me as I start a position with a new company. The documentation here happens to be excellent and it makes getting a new person (me!)… Read the rest

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  • December 10, 2019 Ember Crooks

    Db2 Basics: IBM IDs – How to Sign Up for One

    IBM IDs are completely, 100% free. You pay with a bit of your personal information. You have to provide an email address and a first and last name.

    Purpose

    Those of us who have been working with (or for) IBM for years, really don’t even remember signing up because it is just a minor thing.… Read the rest

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  • November 19, 2019 Ember Crooks

    Troubleshooting SQL0803N

    SQL0803N is an error message that means the SQL statement just issued failed due to violating a unique constraint within the database. The ‘N’ at the end of this error means that this statement failed and was not executed, but that it is probably not a database system issue.… Read the rest

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  • January 18, 2012 Ember Crooks

    Analyzing Deadocks – the old way

    In 9.7, DB2 started offering a new monitoring method for deadlocking. Though this post describes the “old” way, this method also works in db2 9.7. Detailedeadlock event monitors have been deprecated, but not yet removed. This means that even in 9.7, you can still create them and work with them.… Read the rest

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September 7, 2021 Featured

Db2 Basics: Buffer Pools

What is a Buffer Pool?

A buffer pool is one of the most critical memory areas for a Db2 database. Buffer pools are used to cache data in a way that the data can be reused by other connections. They do not store the results of Query A and Query B, but they store the data pages used to produce those results.… Read the rest

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August 27, 2021 Featured / IDUG

In Memory of Scott Hayes

I was very sad to learn that Scott Hayes passed away from COVID-19 on August 18.

The comments on his obituary are a list of friends and mentees from the Db2 community. I wanted to pay tribute to him by sharing my good memories of him and sharing the impact he had directly on my career.… Read the rest

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July 22, 2021 Uncategorized

How to use Docker on your Local Machine – For DBAs

Recent posts related to using Docker with Db2:
An Overview of Running Db2 in Containers
Where do Db2 Containers Come From and How are they Used

The focus of this article is to go through a few of the basics of using Docker with Db2.… Read the rest

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July 15, 2021 Uncategorized

The Basics Of Containers for DBAs

I’ve spent much of the last year or two on a containerization and DevOps crash-course. I’m just recently starting to come up for air and fill in some of the gaps that being neck-deep in the how leave in in the what and why.… Read the rest

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June 8, 2021 Uncategorized

Backing up a Db2 Database to AWS S3

AWS S3 is a cloud object storage service that is easy to use. It is highly available and offers ELEVEN nine’s of durability.

A Few Backup and Recovery Best Practices

I have quite a few blog entries over the years on backup and recovery.… Read the rest

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May 13, 2021 Featured

The Big Mistake IBM is Making with Db2 in Containers

Note: the statements in this entry are my opinions. I quote IBM once in this article, and that statement should be seen as the only pure fact here. I invite IBM and others to add their perspective in the comments below.… Read the rest

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May 11, 2021 Uncategorized

Where do Db2 Containers Come From and How are they Used

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.… Read the rest

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April 20, 2021 Uncategorized

An Overview of Running Db2 in Containers

One of my steepest learning curves in the last year and a half has been really getting into containers on K8’s and Docker and what running databases within them means. I thought I’d share a general overview, and plan to follow this post with more specific and more technical posts.… Read the rest

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March 11, 2021 Uncategorized

The Developer-DB Love-Hate Relationship

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 with it, and am an internationally recognized expert.… Read the rest

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February 9, 2021 Uncategorized

It Matters Where Your Join Clauses Go

Explicit Join vs. Implicit Join

When writing SQL there are two places you can define how tables are joined. The first is explicit, and is specified after the the keyword ON in the join clause like this:


SELECT * 
FROM table_a as a
    JOIN table_b as b ON a.id=b.id
… Read the rest Continue reading »
November 19, 2020 Uncategorized

Overview of Real-Time Monitoring Options For Db2

I thought I’d share an overview of the real-time monitoring options for Db2 (LUW). This article focuses on comparing the options, with links to deeper information on each tool.

Types of Monitoring

First a quick overview of the types of monitoring that every DBA should be doing.… Read the rest

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November 10, 2020 Uncategorized

My Journey through Beginner Data Science Content

When I first started learning about data science, the amount of material out there was daunting. It is hard to find your way in what you should learn and how you should learn. I thought I’d share what has been working for me and what didn’t.… Read the rest

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