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September 2019

Why I prefer VirtualBox over Hyper-V on my notebook

https://uhesse.files.wordpress.com/2019/09/vboxvshyperv.png?w=150&h=8

Announcing SLOB 2.5 for Download at Github.

This is just a quick blog post to announce that SLOB 2.5 is now available for downloading at: https://github.com/therealkevinc/SLOB_distribution/tree/SLOB_2.5.0.

There is an important bug fix in this release that corrects redo logging payload generation when testing with non-zero slob.conf->UPDATE_PCT.  I recommend downloading and using this release accordingly.  The bug is described in the release notes.

A special thanks to Maris Elsins for finding, blogging and reporting the bug.

If you adopt this release there is no need to reload SLOB (via setup.sh). Data loaded with SLOB 2.4 is compatible with SLOB 2.5. Simply deploy the tar archive and bring over your slob.conf and you’re ready to test with SLOB 2.5.

How to add a reserve node to an existing 2+0 #Exasol Cluster

After having installed a 2+0 Cluster in Hyper-V, now let’s expand that to a 2+1 Cluster.

Add the node as a VM first

Add another VM in Hyper-V with the same attributes as the existing two data nodes n11 and n12 and name it n13:

  • 2500 MB memory, not dynamically extending
  • Legacy network adapter, connected to edu-cluster-interconnect
  • Network adapter, connected to edu-public-network
  • Boot order with legacy network adapter first
  • Two hard disk of type VHDX with max. size 100 GB

Give it a static MAC for the Legacy Network Adapter 08:00:27:58:03:21 and a static MAC for normal Network Adapter 08:00:27:71:27:26 and make sure they do not conflict with other existing MAC addresses in your environment.

The Oracle Cloud Free Tier

The New “Always Free Service”s announced at OOW19

Every software vendor has also some free offers, to attract users, demonstrate their product, and support advocacy. What is free at Oracle? Today, the target is about the products which help to attract developers. We have the Oracle XE database that can be installed everywhere for free, with some limits on the capacity, but mostly every features. There are the developer tools that ease the use of the database, like SQL Developer. But what about Cloud?

Updatable Join Views

Here’s a quick “how to”.

If you want to update a column in table A with a column value from table B, then there’s a simple way to check if the required result can be achieved through an updatable join view.

Step 1: write a query that joins table A to table B and reports the rows in table A that you want to update, with the value from table B that should be used to update them, e.g.

Little sleeps

A peripheral question in a recent comment (made in response to me asking whether a loop had been written with a sleep time of 1/100th or 1/1000th of a second) asked “How do you sleep for 1/1000th of a second in pure PL/SQL?”

The answer starts with “How pure is pure ?” Here’s a “pure” PL/SQL solution that “cheats” by calling one of the routines in Oracle’s built-in Java library: