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Insert Portion of Parallel MERGE Seems to Run Serially (PX SEND HYBRID (ROWID PKEY) ) (Doc ID 1682626.1)

Last updated on NOVEMBER 07, 2023

Applies to:

Oracle Database Exadata Express Cloud Service - Version N/A and later
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 Backup Service - Version N/A and later
Information in this document applies to any platform.

Symptoms

The INSERT portion of a MERGE statement seems to run serially because a single worker (or possibly only a few workers) are doing all the work.   The explain plan shows "PX SEND HYBRID (ROWID PKEY).

 

Changes

 

Cause

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In this Document
Symptoms
Changes
Cause
Solution
References


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