Ora-39126 Worker Unexpected Fatal Error In Kupw-worker.prepare-data-imp 71 ❲2027❳

| Cause | Description | |-------|-------------| | Corrupt dump file | File transfer errors (binary vs. ASCII), incomplete dump, or storage corruption | | Character set mismatch | Source and target databases have incompatible character sets, especially with NCLOB/NVARCHAR2 | | Invalid table definition | Table on target has columns that conflict with dump file (data type, length, partition differences) | | Object already exists | Table exists but with constraints/triggers that block Data Pump transformation | | Oracle Bug | Known issues in specific versions (especially 11.2, 12.1, 18c, and early 19c) | | Insufficient privileges | Worker cannot perform a required operation due to missing grants |

The worker process requires enough Program Global Area (PGA) to prepare data, especially for large rows, LOBs, or row batches. If PGA_AGGREGATE_TARGET is too low, the worker may abort. | Cause | Description | |-------|-------------| | Corrupt

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Sometimes reducing or increasing PARALLEL helps: Sometimes reducing or increasing PARALLEL helps: impdp

impdp ... PARALLEL=1   # or match CPU cores

Once the likely cause is identified, several strategies can be employed: Once the likely cause is identified, several strategies

Resolving ORA-39126 requires moving beyond a simple retry. The DBA must adopt a forensic approach: