Wrong Results when Query has Distinct Aggregate (sum(distinct <col>), count(distinct <col>) etc.) and Runs in Parallel
(Doc ID 2324896.1)
Last updated on JULY 22, 2024
Applies to:
Oracle Database - Enterprise Edition - Version 12.1.0.1 to 12.1.0.2 [Release 12.1]Oracle Database Cloud Schema Service - Version N/A 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 Cloud Exadata Service - Version N/A and later
Information in this document applies to any platform.
Symptoms
- Wrong results in 12.1 when the query contains a distinct aggregation (such as sum(distinct <col>) or count(distinct <col>), etc.), and the query is run in parallel
- NULLs may be returned instead of correct values
- The plan will contain the operation PX SEND 1 SLAVE, as in the example below:
Cause
To view full details, sign in with your My Oracle Support account. |
|
Don't have a My Oracle Support account? Click to get started! |
In this Document
| Symptoms |
| Cause |
| Solution |
| References |