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In this series we will follow various steps to download and install OpenVMS for hobbyist use. Perhaps suprisingly, OpenVMS is still prevalent in commercial environments. I have either used or witnessed it in 75% of my placements.
Oracle have released Database 12c Release 1 (version 188.8.131.52.0). Of particular note is the multi-tenant database facility. Each server has one container database (CDB), and that CDB may have one or more pluggable databases (PDBs).
Linux Journal has published a simple to understand introduction to MapReduce using Hadoop. Definitely worth a read if you need an introduction.
It seems like ages ago now that I found my customer had a process that connected to hundreds of Oracle databases to run predefined SQL for health checks. These databases were hosted all over the world and the SQL could take up to fifteen minutes to complete for a single database (with huge amounts of TNS timeouts). The end result was a CSV file that was ultimately formatted into a spreadsheet to provide management information. It took about a day to obtain this final result.
I thought there was a better way.
A well-known problem with NoSQL databases in general is that they do not support the 'ACID' principals held dear by traditional RDBMS DBAs. The Register is reporting that this may soon change with FoundationDB. Atomicity ensures that a transaction is saved or undone, but never exists halfway between the two states. Consistency ensures that only valid data can be stored. Isolation of transactions prevents one transaction interfering with another.
The scenario is a Drupal 6 website running on Debian GNU/Linux current stable is upgraded to Drupal 7 from backports in order to test its behaviour once the new Debian stable is released and Drupal 6 becomes unavailable.
On the Drupal 6 website there is a menu link created as a short-cut to log a user in and take them to the home page. This hides away the huge login block.