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September 2018

Another little 12c improvement

You’ve got a huge table right? Massive! Immense! And then something bad happens. You get asked to remove one of the columns from that table.

“No problem” you think. “I won’t run the ‘drop column’ command because that will visit every block and take forever!”

So you settle on the perfect tool for such a scenario – simply mark the column as unused so that it is no longer available to application code and the developers that write that code.

Oaktable World 2018

Event date: 
Mon, 2018-10-22 - Tue, 2018-10-23

 
 

#Exasol Database whoami

This little script displays some useful meta-information:

Configuring Firewall Access for SQL Database on Azure

Its quite common that the first time you work with a feature in a cloud interface, it can appear so foreign until you’ve done it a few times.  If it’s a task that you may not do often or only once, it can be downright painful.  It doesn’t matter who the cloud provider is or the application, we all have felt the pain of this type of situation and why some of us even started blogging…:)  Until its familiar, it may not feel comfortable and you may not even like how it works.

Aurora MySQL synch/mutex/innodb/aurora_lock_thread_slot_futex wait

Thanks to Jeremiah Wilton for the following info:

This wait event indicates that there is a thread which is waiting on an InnoDB record lock. Check your database for conflicting workloads. More information on InnoDB locking can be found here: https://dev.mysql.com/doc/refman/5.6/en/innodb-locking.html

 

Start/Stop your Autonomous Databases

The ATLAS experiment in LEGO®

Here are two blog posts on the Databases at CERN blog:

Revisiting Embedded InnoDB

Many people these days don’t know InnoDB was originally developed as an independent database engine apart from MySQL. Its author, Heikki Tuuri, modeled InnoDB after Transaction Processing: Concepts and Techniques, the seminal transaction processing book authored by Turing Award laureate James “Jim” Gray and Andreas Reuter. It wasn’t until later InnoDB was integrated with MySQL. While InnoDB […]

Open Source ODBC Drivers for Oracle

In the good old days, database-agnostic applications were written using drivers that implemented the Microsoft Open Database Connectivity (ODBC) API, especially on Windows. Much like JDBC, ODBC provided developers with a single, interoperable, C-based programming language interface that made it possible for applications to access data from a variety of database management systems. When developing an […]

ODBV3 – more comfortable usage

It has been crazy few months – organizing POUG2018 took a lot of energy but it was satisfying as hell! </p />
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Partial indexing – get the dictionary definitions right

Just a quick post to clear up some confusion that can be seen on the partial indexing capabilities in Oracle Database 12c and above. I was at an event in the Oracle Perth office last week, and an attendee mentioned that they thought the feature was not working or was not enabled on their database, and presented the following demonstration to prove their case: