SQL Queries Run In Parallel after enabling DB In-Memory Column Store(IMCS)
(Doc ID 2655885.1)
Last updated on JULY 20, 2024
Applies to:
Oracle Database - Enterprise Edition - Version 12.2.0.1 and laterInformation in this document applies to any platform.
Symptoms
When You move some tables into In-Memory Column Store(IMCS), All queries accessing these tables ran with parallel degree 2.
Environment details :
- Non-RAC
- EXADATA System
- PARALLEL_DEGREE_POLICY=MANUAL
- No PARALLEL Hint used in query
- No DOP set on table or indexes related to that query.
But the same query used to execute in SERIAL mode before enabling IMCS.
Changes
Enabled In-Memory Column Store feature for those tables.
Cause
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In this Document
| Symptoms |
| Changes |
| Cause |
| Solution |
| References |