Posts by Marc Fielding

Comparing Oracle Database Appliance and Exadata

Oracle Database Appliance (ODA) is in many ways similar to an Exadata quarter rack: they both use two similar compute servers in an engineered system configuration, with shared storage and flash storage. But in other ways, especially networking and storage, they differ significantly.

Exadata OEM Monitoring Plugins are Now Available

The Oracle Enterprise Manager Grid Control monitoring plug-ins for Exadata have been released. This is great news for Exadata users, since important components like InfiniBand switches previously had no direct monitoring. The plug-in bundle includes five separate monitoring plugins, here they are.

Potential Data Loss Issue on Exadata

I just got an Exadata Customer Advisory e-mail from Oracle, identifying “an important issue that needs your immediate attention” and pointing to MOS note 1265396.1. The only fix is to upgrade to the newly-released version of the storage server software.

Oracle Exadata V1 Documentation is Published

I was searching for some Exadata-related wait events, and noticed some hits popping up from formerly closely-held Exadata documentation. Upon closer look, I found the full Exadata V1 user’s guide. I hope the V2 documentation will be posted soon.

Exadata Smart Scans and The Flash Cache

One of the key features of Exadata V2 is the flash cache. Although commonly thought of as an OLTP-specific feature, it has also been marketed as a data warehouse accelerator. According to this frequently-used presentation slide, a full Exadata rack provides 21 GB/sec of disk throughput and 50GB/sec of flash throughput. was testing throughput using a simple query, making use of both smart scans and parallel execution. Here’s what the objects look like. They’re running on a quarter rack system with a stated capacity of 4.5GB/sec disk and 11GB/sec flash.

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