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Problem:
Each report generation takes a few hours in Oracle 11g R2 and a few tens of reports has to be generated every day.

Objective:
To reduce report generation time

Understood:
a) "reports that used to take hours can now be executed in seconds using oracle in-memory database feature". (Reference: https://blogs.oracle.com/database/oracle-database-18c-%3a-now-available-on-the-oracle-cloud-and-oracle-engineered-systems?elq_mid=104407&sh=26961462026142651578242315&cmid=WWMK170418P00047)
b) The feature is introduced in Oracle 12c and is available in its later versions.

Please advise on:
a) how in-memory/cache table feature of 11g and database in-memory of 12c are related? former one can be used to improve report generation performance?
b) Procedure to enable the in-memory database feature in Oracle 11g R2?
c) Procedure to make standby database of 11g to 12c?

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  • These are different features: in 11g you can cache a table with row based format using DB_KEEP_CACHE_SIZE parameter. but the in-memory feature in 12c uses of column format to store data in the cache.
    – mohsen.b
    Mar 29, 2018 at 10:12

1 Answer 1

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a) + b) The In-Memory Column Store option was introduced in version 12.1.0.2, it is not available in 11g.

Changes in Oracle Database 12c Release 1 (12.1.0.2)

You can cache tables in earlier versions as well, but the new In-Memory option is different. The point of the new In-Memory option is it stores tables in memory in columnar format, instead of the default row level format.

c) Logical standy, Goldengate (requires extra licence) or Streams.

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