Insert Portion of Parallel MERGE Seems to Run Serially (PX SEND HYBRID (ROWID PKEY) )
(Doc ID 1682626.1)
Last updated on MARCH 12, 2021
Applies to:Oracle Database - Enterprise Edition - Version 184.108.40.206 to 220.127.116.11 [Release 11.2 to 12.1]
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata 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.
The INSERT portion of a MERGE statement seems to run serially because a single slave (or possibly only a few slaves) are doing all the work. The explain plan shows "PX SEND HYBRID (ROWID PKEY).
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