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ORA-07445 [Ddfnet7restore()+320 ] on Materialized View Refresh (Doc ID 312107.1)

Last updated on MAY 14, 2021

Applies to:

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


ORA-07445: exception encountered: core dump [ddfnet7Restore()+320] [SIGSEGV] [Address not mapped to object] [0x000000088] [] [] when attempting to refresh snapshot.

The following conditions match :

1> Materialized view is created in
2> Master table is in a remote database (
3> Master table is accessed via a synonym. The synonym is created in the remote database and is in a schema different schema from the one containing the Master table




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