Db2 Experts on a Data Science Quest
I often lean on analogies when I speak to non-technical people about technical topics. For example, I would explain database locking as “two kids fighting for the same candy bar”. If you introduce isolation levels into the conversation, I would expand the analogy to include “one sibling holding on to a candy bar they care nothing about just because they don’t want the other sibling getting to it”.… Read the rest
Continue reading »While this post is specific to WebSphere Commerce, it covers concepts that may apply to tuning other delete statements as well.
The CLEANCONF table stores the delete statements that are used by DBCLEAN. Most of them use syntax like this for the date component:
(days(CURRENT TIMESTAMP) - days(prevlastsession)) = ?… Read the rest Continue reading »
Today we are going to talk about some random DB2 features that can’t stand in a blog of their own, but are worth discussing nonetheless. These are tidbits I had discovered during “DB2’s Got Talent” presentations, IDUG conferences, or “Hey, look what I discovered” moments.… Read the rest
Like many applications, WebSphere Commerce puts all tables in USERSPACE1 unless they need larger page sizes. This actually works just fine for smaller and midrange implementations, but we have about one build a year that requires something else – either because of standards that client DBAs adhere to or because they actually are busy enough for I/O and separate buffer pools to matter.… Read the rest
This post is specific to WebSphere Commerce.
I’m usually pretty critical of the IBM webcasts about WebSphere Commerce. There have been some pretty bad or incomplete ones in relation to WebSphere Commerce databases(“run dbclean” is the most frustrating, general advice ever).… Read the rest
Continue reading »