Oracle Database In-Memory Option (DBIM) Basics and Interaction with Data Warehousing Features
(Doc ID 1903683.1)
Last updated on SEPTEMBER 11, 2024
Applies to:
Oracle Database Cloud Service - Version N/A and laterOracle Database - Enterprise Edition - Version 12.1.0.2 and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Information in this document applies to any platform.
Purpose
This note references some basic information from the Oracle® Database Administrator's Guide 12c Release 1 (12.1) about the Oracle Database In-Memory (IM) column store and adds some information regarding its interaction with various data warehousing features.
Questions and Answers
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In this Document
| Purpose |
| Questions and Answers |
| Basics |
| 1. What patches are required for Database In-Memory? |
| 2. Where can I find information about how the IM column store works? |
| 3. How do I enable/disable the IM column store, and what is the minimum size? |
| 4. Will objects age out of the IM column store, and can I increase the size of the IM column store dynamically? |
| 5. What objects can I put in the IM column store? |
| 6. When will an object benefit from being in the IM column store? |
| 7. When will an object not benefit from being in the IM column store? |
| 8. How do I populate the IM column store? |
| 9. How should I adjust SGA_TARGET and PGA_TARGET when using the IM column store? |
| 10. How can I estimate how much memory I need to allocate for each object I want to put in the IM column store? |
| 11. Is the IM column store transactionally consistent with the buffer cache? |
| 12. Is IM column store compression the same as Advanced Compression? |
| 13.. How is DML handled? |
| 12.2 New Features |
| 18.1 New Features |
| Licensing |
| 1. I do not have a license for the DBIM option. How do I demonstrate it is not in use in my database in case of audit? |
| Monitoring |
| 1. Is there an Advisor for the IM column store? |
| 2. How can I monitor the contents of the IM column store? |
| Advanced Compression |
| 1. What happens if data on disk is compressed with either Basic or Advanced Compression? |
| Data Pump (non-TTS) |
| 1. Will objects be imported with the INMEMORY attribute? |
| Information Lifecycle Management - Automatic Data Optimization (ADO) |
| Materialized Views |
| 1. Can I put my materialized view logs in the IM column store? |
| Multitenant |
| 1. Should I set the INMEMORY_SIZE parameter at the PDB level, as well as at the CDB level? |
| Optimizer and Plan Operations |
| 1. My table is in the IM column store, so why do I see primary key (PK) access instead of TABLE ACCESS IN MEMORY FULL? |
| Parallel Execution |
| 1. Will parallel execution work with the IM column store? |
| Partitioning |
| 1. If only some of my partitions of a partitioned table are in the IM column store, will the IM column store be used? |
| 2. If I exchange partitions with a partitioned table that is INMEMORY, will the table that was exchanged into the partition be in the IM column store? |
| Query Rewrite |
| 1. If I have my primary (source) tables in the IM column store, will my query still rewrite using my materialized views? |
| RAC |
| 1. How is the IM column store distributed in a RAC environment? |
| Transportable Tablespaces (TTS) |
| 1. Is there anything special that needs to be done to use TTS when a tablespace or its objects have the physical attribute of INMEMORY? |
| Wrong Results |
| 1. If have wrong results, how can I narrow down the problem to confirm or eliminate the IM column store as a factor? |
| Automatic In-Memory, External Table Support and Greater Performance in Oracle Database 18c |
| In-Memory Dynamic Scans |
| References |