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Articles tagged RAC

10 December 2015
10 December 2015

Oracle Data Pump in RAC

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Oracle Data Pump was introduced in Oracle Database 10g to enable very high-speed transfer of data and metadata between databases. A salient feature of Data Pump is that it can parallelize the export and import jobs for maximum performance. However, prior to Oracle Database 11g release 2 (11.2), if a Data Pump job is executed in parallel on an instanc… Read more
22 April 2015
22 April 2015

Oracle Multitenant: Convert single instance PDB to RAC by plugging it into a RAC CDB

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Prior to oracle database 12c, the procedures for converting from single-instance databases to Real Application Clusters involved following steps: Configure the control file attributes and move control file to shared storage Make the initialization parameter file entries for cluster-enabled environments and move SPfile to shared storage Create an undo tablespace for each additional instance Create redo threads for each additiona… Read more
19 August 2013
19 August 2013

High load average, high IO wait, slow process startup, slow RAC communications

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We have been having performance problems on our test Exadata for several months. I have opened five Oracle service requests for multiple symptoms. While the cpu utilization was fairly low, Oracle background processes would hang, the OEM 12c agent would hang, backup jobs would hang, we would experience slow communications between RAC nodes, half of the cpus would be in… Read more