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).
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Following an upgrade of Debian on my Asus WL-500W I had an unbootable system. Restoring from backups gave me some breathing space but I really needed to move forward with the Debian upgrade and find out why the system was not booting. Some instructions and some online and in-store purchases had me up and running just two days later.
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.
By using a checkpoint table in the OGG replicat database, you can retrospectively review the replicat's lag using flashback query (with some limitations if you do not utilise a heart beat table).
Picture the scenario. You receive observations that the Oracle GoldenGate (OGG) replicat system that you are responsible for had fallen behind overnight and all overnight processing was performed against incorrect data. What do you do? Perhaps the observation was erroneous. How can you demonstrate this?
Linux Journal has published a simple to understand introduction to MapReduce using Hadoop. Definitely worth a read if you need an introduction.