Oracle Exadata: Difference between revisions

Revision as of 00:43, 20 September 2019

Revision as of 00:59, 20 September 2019

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== Elastic configurations ==

Prior to the X5-2 generation, Exadata systems were only available in fixed-size configurations of Eighth, Quarter, Half and Full Rack sizes. With the X5-2 Exadata release in January, 2015, ''elastic configurations'' were introduced. An elastic configuration has a customer-specified combination of database servers and storage servers. Elastic configurations allow individual storage or compute servers to be added to a base configuration until the physical rack is full. For example, an Exadata system optimized for in-memory database processing could be created by adding many compute servers, each with maximum memory. Conversely, an Exadata system optimized for a large data warehouse could be configured by adding many High-Capacity storage servers. The ratio of compute to storage servers can vary, depending on the characteristics of the intended workload. Elastic configurations may also be used to scale out earlier generation Exadata systems using X8-2the latest compatible servers. In addition, Exadata Database Machines have always been able to span multiple racks using the built-in InfiniBand network fabric connections. Thus, Exadata’s scale-out extends beyond a single physical rack.

== Evolution ==

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''[https://www.oracle.com/technetwork/database/exadata/exadata-x7-2-ds-3908482.pdf Exadata X7-2]''<ref name=":8" /> and ''[https://www.oracle.com/technetwork/database/exadata/exadata-x7-8-ds-3938980.pdf X7-8]'' were released in 2017<ref>{{Cite web|url=https://video.oracle.com/detail/videos/featured-videos/video/5591322770001|title=Video: Oracle's Next Generation Exadata Database Machine X7|last=Loaiza|first=Juan|date=2017|website=Oracle Corporation|archive-url=|archive-date=|dead-url=|access-date=August 2, 2018}}</ref>. ''Flash capacity doubled''. Flash cards became ''Hot pluggable'' for online replacement. ''10 Terabyte (TB) disk drives'' debuted along with ''25 Gb/sec Ethernet'' connectivity. Oracle Database In-Memory processing was extended into Flash storage, and storage server DRAM was utilized for faster OLTP.

''[https://www.oracle.com/technetwork/database/exadata/exadata-x7-2-ds-3908482.pdf Exadata X8-2]'' <ref name=":29" />and ''X8-8'' were released in April 2019. ''Exadata Storage Server Extended (XT)'' was introduced for low-cost storage of infrequently accessed data.''14 Terabyte (TB) disk drives'' debuted along with ''60% more compute cores'' in Exadata storage servers. Machine Learning algorithms were added to automatically monitor CPU, network and memory to detect anomalies such as stuck processes, memory leaks and flaky networks, and to automatically create (Auto index), rebuild or drop indexes. Optimizer statistics are also gathered in real-time as DML executes. For enhanced security, Advanced Intrusion Detection Environment (AIDE) was added to detect and alert when unknown changes to system software are made.

[https://www.oracle.com/a/ocom/docs/engineered-systems/exadata/exadata-x8m-2-ds.pdf Exadata X8M-2]<ref>{{Cite web|url=https://www.oracle.com/corporate/pressrelease/oow19-oracle-unleashes-worlds-fastest-database-machine-091619.html|title=Oracle Unleashes World's Fastest Database Machine|last=Brown|first=Victoria|date=September 16, 2019|website=oracle.com|url-status=live|archive-url=|archive-date=|access-date=September 19, 2019}}</ref> and [https://www.oracle.com/a/ocom/docs/engineered-systems/exadata/exadata-x8m-8-ds.pdf X8M-8] were released in September, 2019. Substantial performance increases resulted from the addition of [[3D XPoint|Intel Optane DC Persistent Memory]] in Exadata Storage Servers, and a new 100 Gbit/s internal network fabric based on RoCE (RDMA over Converged Ethernet), replacing the previous InfiniBand fabric. These changes increased Read IO throughput by 2.5x and lowered IO latency 10x. In addition. a new KVM based virtual machine replaced the previous Xen based one, doubling the amount of memory available to a guest VM.

== References ==