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Migrating to the Exadata Database Machine
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Capture the source database platform specifications, mainly the details on the database versions, use of ASM, ASM allocation unit size (AU_SIZE), ASM diskgroup redundancy levels, and the database extent sizes These values will help determine the right migration strategy in the later stages
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NOTE The Oracle IO Numbers (ORION) tool can be used to calculate performance metrics of the source database storage subsystem The metrics captured by ORION mimic the actual Oracle Database I/O performance, since ORION uses the same I/O libraries and kernel code as the Oracle Database software The ORION tool does not need the Oracle Database software to function and can be installed on both Oracle and non-Oracle source systems, provided it is certified on the platform
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Capture all ongoing data loads and extracts occurring on the source system, whether they are file-based or have other databases as direct sources or destinations Capture the tools and processes used to perform these loads and extracts, whether they are packaged ETL tools or custom scripts This information is needed to estimate the effort needed to refactor these processes to work against the Database Machine When capturing this information, you should:
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Identify the sources for the data loads and destination systems for the extracts and their connection methods into the database, whether through SQL*Net, JDBC, or ODBC Identify any replication tools used either to feed into the source system or to replicate changes from the source to external systems Investigate the current replication tool s support for Oracle Databases
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Capture the source code metrics for the custom scripts used for loads and extracts Document the tools or scripts used to perform the loads and extracts and whether they are proprietary to the third-party source technology Capture the ETL tools used for loads, extracts, or ongoing ETL; their complexity; connectivity and driver requirements; source databasespecific features used in ETL; and the tool support for Oracle databases
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It is critical to discover the applications that will be affected when the source database is migrated to the new platform The number and types of applications affected and the degree of the impact will determine the applications migration strategy Once the applications and their details are known, the level of effort involved in modifying these applications to work with the Database Machine can be estimated To collect this information, you should:
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Capture the complexity of the applications connecting into the source system, whether they are using database- and vendor-specific technologies, and the support of these tools and applications with Oracle Database 11g Release 2 Focus on capturing source code metrics on the portions of code that comprise database-related logic Capture the use of vendor-specific SQL functions or logic within the application code The more complex the vendor-specific SQL being used in these applications, the harder the translation becomes Document the drivers used for connectivity native, JDBC, ODBC and versions and any specific requirements for running with particular drivers and versions Identify the application servers connecting to the source database, whether they are based on Java or NET, application server connection pools and mechanisms used, and Oracle Database 11 g Release 2 support provided by the application servers Capture off-the-shelf reporting and business intelligence tools used, along with the tools support for Oracle Database 11 g Release 2 and any custom SQL statements used within or generated by the tool that are proprietary to the source database
10:
Migrating to the Exadata Database Machine
Backup and Recovery Architecture
Although you may end up using different tools and techniques for performing backup and recovery of the Database Machine, you have to capture the backup and recovery architecture, methods, and SLAs from the current environment to ensure that you do not lose any existing capabilities in this area Whether the current strategy is to back up to tape directly or to disk or you are using a hybrid disk and tape strategy, the idea should be to utilize the existing policies and infrastructure when configuring backups in the Database Machine environment To collect this information, you should:
Capture the recovery time objective (RTO) and recovery point objective (RPO) from the current SLAs Consider the requirement to connect external tape drives or diskbased backup storage systems to the Database Machine The Database Machine connects to the outside world using the built-in InfiniBand and Ethernet ports Investigate if third-party snap mirroring technologies are used to perform backups and also to stand up test or development environments These technologies will not work on the Database Machine, as the third-party vendors cannot directly access the Exadata Storage Servers and there is no support for hardware RAID Therefore, it is important to have an alternative solution to the snap mirror if this capability is needed on the Database Machine Oracle RMAN is the only tool capable of performing backups of the databases residing in the Database Machine For further details on this topic, refer to the section on backup and recovery best practices in 6
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