If the import succeeds, run DBMS_STATS.GATHER_SCHEMA_STATS after the data is loaded. 2. Recompile Invalids on Source and Target
ORA-39126: Worker unexpected fatal error in KUPW$WORKER.PREPARE_DATA_IMP [71] — oracle-mosc
impdp user/password directory=DIR dumpfile=data.dmp logfile=imp.log EXCLUDE=STATISTICS Use code with caution. Solution 3: Filter System Schemas
References: Oracle Documentation (Doc ID 2472847.1), Community Resolutions, and Bug Fix Analysis. If the import succeeds, run DBMS_STATS
The internal procedure PREPARE_DATA_IMP prepares the target database objects to receive data rows. The visual tag [71] identifies the precise line or block of code within that internal procedure where the execution encountered an unhandled exception. Root Causes of the Error
impdp ... PARALLEL=1 # or match CPU cores
If the ORA-39126 error points to a specific package body or function, like DBMS_METADATA in the error stack, recompiling the invalid objects can resolve the issue. Root Causes of the Error impdp
Before implementing a fix, a thorough diagnosis is recommended. Follow this structured approach to gather necessary information:
The PREPARE-DATA-IMP phase is critical because Data Pump must reconcile the source dump file’s metadata and data with the target database’s environment. Here are the most frequent triggers for this error:
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. making the patch unnecessary.
If the issue is in metadata preparation, try importing only the data ( CONTENT=DATA_ONLY ) after manually creating the schema objects, or vice versa, to isolate whether the issue is data-related or metadata-related. Step 4: Validate the Dumpfile
Before running a Data Pump export, refresh your dictionary stats using DBMS_STATS.GATHER_DICTIONARY_STATS to avoid corrupt or stale metadata parsing blocks.
Once the likely cause is identified, several strategies can be employed:
If you continue to face issues, it is highly recommended to open a Service Request (SR) with Oracle Support, attaching the impdp log file, the trace file created during the error, and the output of select * from v$version .
: Upgrade to Oracle Database 20c or higher . This error has been addressed in the underlying codebase of newer versions, making the patch unnecessary.