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The Oracle database has been supporting enterprise-class applications for decades, and the development team at Oracle knows that supporting the integrity of data is an absolute pre-requisite for their database Flash Cache is memory-based, and memory is inherently less stable than disk Does this difference cause any potential issues with data integrity, since data stored on flash-based storage could potentially disappear First of all, you should be aware that the particular flash cards used in the Exadata Storage Server have a number of features to compensate for potentially instability, including only using a portion of the available storage to allow for automatic detection and swapping out of bad blocks in memory, as well as an integrated super capacitor to supply power to the card in the event of a power failure In addition to these hardware-based protections, if you choose to use the Exadata Flash as flash-based grid disks, you can use high-redundancy mirroring with ASM
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Second, one of the most crucial aspects of data integrity that could be affected by a loss of data in the cache would be if a user wrote data to the cache and the values were lost before they could be written to disk The Oracle Database can handle data loss as long as the write activity has been written to the log file The redo logs hold the primary responsibility for avoiding data loss in the event of a failure, and these logs are not stored in the Flash Cache Finally, remember that the Exadata Smart Flash Cache is normally used as a cache If any portion of the cache goes away, all that happens is the Exadata Storage Server gets the requested data from disk You would lose the performance advantages of the Flash Cache for the duration of the time that this portion of the cache was not available, but the failure would not have any other impact on the operating environment
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The Oracle Database has long been the leading database for OLTP workloads As the authors have updated some of their other books over the past few releases, we have found that not many features have been added to the Oracle Database to improve OLTP operations, for the simple reason that the product is fairly complete already in this area The Exadata Database Machine benefits from all of these features for OLTP, and, since Oracle on Exadata works transparently for all applications, these features can provide the same benefits on this new platform as on the classic Oracle Database
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There are a number of features and best practices that you should use for OLTP workloads on an Exadata Database Machine, which have been used with the Oracle Database for many years
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MVRC Multiversion read consistency was first introduced to the Oracle Database more than 20 years ago and still provides one of the key advantages for OLTP workloads Just as Exadata technology improves the overall performance of a workload by removing bottlenecks, such as I/O bandwidth, MVRC performs a similar function by removing delays caused by contention for resources, primarily in OLTP environments With MVRC, writers don t block
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Achieving Extreme Performance with Oracle Exadata
readers, and readers don t block writers MVRC provides additional benefits, as described in 2, but the core capability of removing delays caused by locks used to protect data integrity remains one of the most powerful features of the Oracle Database
Shared servers Normally, each user process connecting to Oracle from a client has a shadow process, or dedicated server, on the server machine Oracle allows you to use a shared server which, as the name implies, can share a server process among more than one user Shared servers work by assigning clients to a dispatcher rather than a dedicated server process The dispatcher places requests into queues, which are processed by a pool of shared server processes, as shown in Figure 8-1 Since each server process consumes resources, reducing the number of servers required reduces resource demand and improves the scalability of an Oracle environment, especially in situations that support a large number of users, such as OLTP environments Shared or dedicated servers are determined by configuration parameters, so applications can take advantage of this feature without any change in code
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