How to recreate a lost OCR ASM disk group from scratch.  This HowTo applies to Database 12c RAC.  We will rebuild the disk group, restore the OCR, replace the voting disks, and recreate the ASM parameter and password files.

Oracle Database 12c Release 1 fully supports IPv6. Here is how to add IPv6 support to VIPs and SCANs in a 12c RAC cluster. The VIPs, SCANs and their listeners will support both IPv4 and IPv6 and addresses from both families will relocate between RAC nodes as normal. It is only assumed that the servers already have a host IPv6 address assigned via auto-configuration.

Below I will annotate an example using SQL to extract and chart some tablespace trending data using GNU Plot.

Oracle's Grid Control collects, stores, and manages historical metric data for hosts, databases, and all sorts of targets. This data is difficult to retrieve, especially the historical data. Creating a report in Grid Control results in a small bitmapped image. If you need, say, a year of CPU data, this small bitmap is difficult to interpret.

If the data is extracted from Grid Control's Oracle Management Service (OMS) then graphically representing the data can also be performed externally. One such tool that can be used to graph the data is GNU Plot.

This HowTo converts a working 32 bit installation into a 64 bit system. You keep all programs, settings and data. You start with a 32 bit system that can run 64 bit programs, and finish with a 64 bit system that can run 32 bit programs. We firstly demonstrate an upgrade from 6.0 Squeeze 32 bit to 7 Wheezy because Debian 7 is a pre-requisite.

With the recent release of Debian GNU/Linux 7.0 Wheezy, a new feature called multiarch has been introduced. The facility permits the installation of executable files (such as libraries and programs) from multiple architectures simultaneously on the same system. The primary use of this is to allow 32 bit programs to be run on a 64 bit system, but there are more interesting possibilities. We can turn this on its head, allowing 64 bit programs to run on a 32 bit system, then ultimately replace all 32 bit programs with their 64 bit equivalents. No other operating system can provide this flexible feature.