What are the features of Exadata?

3 New Features for Oracle Exadata System Software Release 20. x

• Exadata Secure RDMA Fabric Isolation.
• Smart Flash Log Write-Back.
• Fast In-Memory Columnar Cache Creation.
• Cell-to-Cell Rebalance Preserves PMEM Cache Population.
• Control Persistent Memory Usage for Specific Databases.

What is smart flash cache in Exadata?

The Exadata Smart Flash Cache is a cache for storing redo data until this data is safely written to disk. The Exadata Storage Server comes with a substantial amount of flash storage. A small amount is allocated for database logging and the remainder will be used for caching user data.

What is new in Exadata X8M?

Exadata X8M adds the shared persistent memory acceleration tier, twelve 128 GB Intel® Optane™ DC Persistent Memory modules in front of flash to boost performance even more. Deployed using smart software, Exadata Smart PMEM Cache, only the hottest database blocks are automatically cached in this new tier.

What is smart scan in Exadata?

The Smart Scan feature in Exadata enables SQL processing to happen at the storage tier, instead of the database tier, to improve query performance. Smart Scan reduces the volume of data sent to the database tier thereby reducing the CPU usage on database nodes.

What is Flash Cache Oracle?

Database Smart Flash Cache allows the database buffer cache to be expanded beyond the SGA in main memory to a second level cache on flash memory. Online Transaction Processing (OLTP) and Datawarehouse (DWH) environments are expected to benefit from this technology.

What is netapp Flash Cache?

Flash Cache is optimized to improve random read performance. Flash Cache is a controller-level cache and improves performance for all aggregates on a controller.

What is persistent memory in Exadata X8M?

Persistent Memory Commit Accelerator Persistent Memory in combination with RDMA is used to accelerate log writes in Exadata X8M, which therefore improves the performance of commits. Exadata X8M delivers up to 8X faster log writes than the previous generation of Exadata, which was already the fastest on the market.

What is Dom0 and DomU?

Dom0 is an abbreviation for domain zero, the management or control domain with privileged access to the hardware and device drivers. DomU is an unprivileged domain with no direct access to the hardware or device drivers.

What is the difference between Dom0 and DomU in the Xen architecture?

The Dom0 VMs have the higher privileges and they can access the hardware whereas DomU VMs have lower privileges and cannot directly access the hardware as shown in Fig. 4 [5]. When the Xen hypervisor is started, for the first time it loads the Dom0 VM.