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Oracle Database 12c In-Memory Options

edited Jan 29, 2018 1:58PM in Database Administration (MOSC) 2 commentsAnswered

Hi DBAs,

I'm planning to design and implement in-memory for tables to improve performances.

Configuration steps are clear. However, there are couple of points I cannot find from Oracle Guides.

1) In default, without compression, is memory size for table in 1:1 ratio?

    For example, the target table to be populated in datafiles is 1GB. Do I need 1GB in-memory for the table?

2) Will In-memory size slow down the instance startup time?

    The SGA of target instance is 32GB, and 20GB more added to for in-memory tables.

    Since the in-memory tables will be populated when the instance started or tables being accessed (from the paper), will the population slow the instance startup?

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