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High Availability and Backup Strategies
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The recommended ASM diskgroup best-practice configuration as discussed in 5 is to create a minimum of two diskgroups in the Database Machine The first diskgroup will store the user and system tablespaces, and the second will store the database Fast Recovery Area (FRA) The database FRA is used for storing archived logs, flashback logs, redo logs, and control files For the purpose of this discussion, let us assume the diskgroup that stores user data is named DATA and the diskgroup that stores the FRA is named RECOV NOTE A third ASM diskgroup is created by Oracle when configuring the Database Machine This diskgroup is typically used to store OCR and voting disks required by Oracle Clusterware, and is created on the grid disks residing on the outermost tracks The DATA diskgroup should be created on grid disks that reside on the hot or outer tracks of the cell disk, whereas the RECOV diskgroup should reside on the cold or inner tracks of the cell disk This ensures higher performance for the applications by ensuring faster access to the data blocks from the hot areas of the cell disk Storage Configuration with Data Guard The Data Guard setup ensures that you can tolerate all types of failures on the primary site, up to and including a total disaster of the primary Also, for failures that are limited to a single Exadata Storage Server, the Grid RAID features will make the data available at all times without requiring the need to fail over to the standby site The MAA best practices for configuring DATA and RECOV diskgroups with Data Guard are
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Create DATA and RECOV diskgroups using ASM NORMAL redundancy The DATA and RECOV diskgroups should be created across all available Exadata Storage Servers in the Database Machine
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Achieving Extreme Performance with Oracle Exadata
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This setup guarantees maximum protection due to failures, and at the same time provides the best performance by utilizing all available Exadata Storage Servers in the storage grid
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Storage Configuration Without Data Guard When you do not have Data Guard configured, as stated earlier, you are only protected from single failures or multiple failures confined to one Exadata Storage Server when you use ASM NORMAL redundancy The MAA best practices for configuring DATA and RECOV diskgroups without Data Guard are
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Create the DATA diskgroup using ASM NORMAL redundancy Create the RECOV diskgroup using HIGH redundancy The HIGH redundancy ensures protection from double failures occurring across the Exadata Storage Servers and guarantees full recovery with zero data loss
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NOTE If you are using ASM NORMAL redundancy without a Data Guard setup, there is a chance of data loss when multiple failures occur across a set of Exadata Storage Servers For example, if you lose both copies of a redo log due to multiple failures, and if the redo was marked active by the database indicating that it was an essential component for performing a full recovery, you have essentially lost your data that was in the redo
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Preventing Data Corruption
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Data corruption can occur anytime and in any layer of the hardware and the software stack that deals with storing and retrieving data Data can get corrupted when it is in the storage, during its transmission over the network, in the memory structures, or when the storage layer performs an I/O operation If data corruption is not prevented or repaired in a timely manner, the database will lose its integrity and can result in irreparable data loss, which can be catastrophic for the business
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High Availability and Backup Strategies
In this section, we will discuss the best practices for preventing and detecting corruption, and the methods available for automatically repairing corruption when it occurs Although the best practices can help you prevent almost all types of corruption, you might still end up with some, as corruption cannot always be completely prevented If you have discovered corruption, you can use database recovery methods such as block-level recovery, automated backup and recovery, tablespace point-in-time recovery, remote standby databases, and transactional recovery Keep in mind that the recovery process can be time consuming, so every effort should be taken to minimize the occurrence of corruption
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