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

Oracle Data Pump is a cornerstone utility for database administrators, enabling high-speed movement of data and metadata between Oracle databases. Its reliability is generally exceptional, but encountering an error such as ORA-39126: Worker unexpected fatal error in KUPW-WORKER.PREPARE-DATA-IMP (71) can be a perplexing and frustrating experience. This essay explores the nature of this error, its typical causes, and the systematic approach required to resolve it. Unlike syntax errors or permission denials, this error signals an internal inconsistency within the Data Pump worker process, demanding a deeper diagnostic strategy.

ORA-39126 is a generic "Worker unexpected fatal error" that occurs during Oracle Data Pump operations. The specific sub-program KUPW$WORKER.PREPARE_DATA_IMP [71] typically points to an internal failure while the worker is preparing to import data rows into a table. Primary Causes & Solutions

The error is often triggered by metadata inconsistencies or stale environmental statistics rather than a direct issue with the data itself.

The error ORA-39126: Worker unexpected fatal error in KUPW$WORKER.PREPARE_DATA_IMP [71] is an internal exception within the Oracle Data Pump (impdp) utility. It occurs when a worker process encounters an unhandled state while preparing data for import, often leading to a premature job termination. Common Causes

This specific error is frequently linked to metadata inconsistencies or environment-specific bugs:

Malformed Statistics: Stale or corrupt optimizer statistics in the source dump file can cause the worker to crash during the preparation phase.

Invalid Data Pump Components: If the Data Pump internal packages (like KUPW$WORKER) or the database catalog are invalid or out of sync, workers will fail.

Permission Issues: Running the import as SYSDBA rather than a standard user with DATAPUMP_IMP_FULL_DATABASE privileges can lead to unexpected behavior.

System Schema Conflicts: Attempting to import system-related schemas (like SYSMAN) across different Oracle versions (e.g., 11g to 12c) often triggers internal preparation errors. Troubleshooting and Resolution Steps 1. Rebuild Data Pump Metadata

If the issue is caused by a corrupt Data Pump catalog, you can re-register the components by running the dpload.sql script as a SYSDBA user:

-- For Container Databases (CDB), ensure all PDBs are open first ALTER PLUGGABLE DATABASE ALL OPEN; -- Run the script from the rdbms/admin directory @?/rdbms/admin/dpload.sql Use code with caution.

After running this, recompile any remaining invalid objects using the utlrp.sql script. 2. Exclude Statistics

The error ORA-39126: Worker unexpected fatal error in KUPW$WORKER.PREPARE_DATA_IMP [71] is a generic internal failure within the Oracle Data Pump import process. It typically indicates that the worker process encountered an unhandled exception while preparing for a data import, often triggered by inconsistent metadata, corrupt dictionary statistics, or invalid internal packages. Potential Causes

Stale or Corrupt Statistics: Stale dictionary or fixed object statistics are frequent culprits, causing Data Pump to miscalculate its execution plan.

Internal Package Issues: Corrupt or invalid KUPW$WORKER or DBMS_METADATA package bodies can prevent the worker from initializing correctly.

Schema Incompatibilities: Issues often arise when importing system-managed schemas (like SYSMAN or SYS) or when there are character set mismatches between the source and target environments.

Privilege Conflicts: Using the AS SYSDBA clause during import can sometimes trigger internal bugs; standard practice recommends using a user with DATAPUMP_IMP_FULL_DATABASE privileges instead. Troubleshooting and Solutions 1. Gather Fresh Dictionary and Fixed Object Statistics

Refreshing the database's internal statistics often resolves these internal worker errors.

-- Run these as a user with SYSDBA privileges EXEC DBMS_STATS.GATHER_DICTIONARY_STATS; EXEC DBMS_STATS.GATHER_FIXED_OBJECTS_STATS; Use code with caution. Copied to clipboard 2. Rebuild Data Pump Components

If the error persists after statistics are updated, the Data Pump utility itself may need to be reloaded to fix potential internal package corruption. Navigate to your $ORACLE_HOME/rdbms/admin directory. Run the following script as SYSDBA: @dpload.sql Use code with caution. Copied to clipboard

In Multitenant environments (12c and higher), ensure all PDBs are open before running this script. 3. Refine the Import Parameters

If specific objects are causing the crash, you can bypass them to finish the rest of the import.

Exclude Statistics: Add EXCLUDE=STATISTICS to your impdp command and gather them manually afterward.

Exclude System Schemas: If performing a full import, ensure you are excluding system-internal schemas by using EXCLUDE=SCHEMA:"IN ('SYSMAN', 'ORDDATA', 'WMSYS')".

Avoid SYSDBA: Run the import command as a standard user with the appropriate Data Pump roles instead of using / as sysdba. 4. Check for Specific Patches

A very specific Oracle error!

ORA-39126 is a Data Pump error that occurs when there is an issue with the worker process. Here's a breakdown of the error:

ORA-39126: Worker unexpected fatal error in KUPW_WORKER.PREPARE_DATA_IMP

This error typically indicates that a worker process, which is responsible for executing a specific task during the import operation, encountered an unexpected fatal error while preparing data for import.

Possible causes:

Additional information:

The error is occurring in the KUPW_WORKER.PREPARE_DATA_IMP procedure, which is part of the Data Pump worker process. The error code is 71, which is an internal Oracle error code.

Troubleshooting steps:

Oracle Support or further assistance:

If you are unable to resolve the issue using the above steps, you may want to engage Oracle Support or a certified Oracle professional for further assistance. They can help you:

Troubleshooting ORA-39126: Worker Unexpected Fatal Error in KUPW$WORKER.PREPARE_DATA_IMP [71]

If you are seeing the ORA-39126 error during an Oracle Data Pump Import (IMPDP), specifically referencing KUPW$WORKER.PREPARE_DATA_IMP [71], you have likely hit a snag in the metadata preparation phase. This error is a "catch-all" for unexpected internal worker failures, and the suffix [71] usually points to a specific issue with how the worker process is handling table data or partitioned objects. What Causes ORA-39126 (Internal Error 71)?

The error occurs when the Data Pump worker process encounters a condition it doesn't know how to handle. In the context of PREPARE_DATA_IMP [71], the most common culprits are:

Metadata Inconsistency: The source database has orphaned entries in the data dictionary or "ghost" partitions that the export file is trying to recreate.

Invalid Objects: The schema being imported contains invalid spatial indexes, functional indexes, or complex constraints that fail during the "prepare" phase.

Statistics Mismatch: Issues with importing table statistics, especially on partitioned tables, can trigger this internal logic error.

Version Disparity: Importing a dump file from a much higher Oracle version into a lower version without using the VERSION parameter correctly. Step-by-Step Solutions 1. Exclude Statistics

The most frequent cause of error [71] is a failure in processing table statistics. You can bypass this by excluding statistics during the import and gathering them manually later. Add this parameter to your impdp command: EXCLUDE=STATISTICS Use code with caution.

If the import succeeds, run DBMS_STATS.GATHER_SCHEMA_STATS after the data is loaded. 2. Recompile Invalids on Source and Target

Data Pump can choke on metadata for objects that are in an INVALID state.

Run utlrp.sql on both the source (before export) and the target database to ensure all objects are valid.

If you cannot re-export, try using EXCLUDE=INDEX or EXCLUDE=CONSTRAINT to see if the worker moves past the error. 3. Use the VERSION Parameter

If you are moving data between different Oracle versions (e.g., 19c to 12c), ensure you used the VERSION parameter during the export (EXPDP). If you didn't, try adding it to your import command: VERSION=12.1 (or your target version) Use code with caution. 4. Check for Corrupt Metadata

Sometimes the error is caused by a specific table. To find out which one, increase the logging detail: TRACE=480300 Use code with caution.

Check the resulting trace files in your DIAGNOSTIC_DEST. Look for the last object processed before the "Fatal Error." You can then try running the import again while excluding that specific table: EXCLUDE=TABLE:"IN ('PROBLEM_TABLE_NAME')" Use code with caution. 5. Patching and Bug 27634993

There is a known Oracle bug related to KUPW$WORKER where imports fail when REMAP_TABLESPACE is used alongside certain partitioned objects.

Workaround: Try performing the import without REMAP_TABLESPACE into a staging area, or check Oracle Support (MOS) for patch 27634993. Summary Checklist Quick Fix: Add EXCLUDE=STATISTICS to your command. Cleanup: Ensure utlrp.sql has been run.

Investigation: Use TRACE=480300 to find the specific table causing the crash.

Dictionary: Check DBA_RESUMABLE to see if the worker is actually stuck on a space issue rather than a logic error.

ORA-39126 Worker Unexpected Fatal Error in KUPW-Worker.Prepare-Data-Imp 71: Causes, Solutions, and Troubleshooting Steps

The ORA-39126 error is a critical issue that can occur during data import operations using Oracle Data Pump, a utility that enables you to export and import data and metadata from one database to another. This error is specifically related to the KUPW-Worker.Prepare-Data-Imp 71 process, which is a worker process responsible for preparing data for import.

Understanding the ORA-39126 Error

The ORA-39126 error message typically appears as follows:

ORA-39126: Worker unexpected fatal error in KUPW-Worker.Prepare-Data-Imp 71

This error indicates that a worker process encountered an unexpected fatal error while preparing data for import. The error can occur due to various reasons, including:

Causes of the ORA-39126 Error

To troubleshoot the ORA-39126 error, it's essential to understand the underlying causes. Some common causes include:

Solutions and Troubleshooting Steps

To resolve the ORA-39126 error, follow these troubleshooting steps:

Best Practices to Avoid the ORA-39126 Error

To minimize the risk of encountering the ORA-39126 error, follow these best practices:

Conclusion

The ORA-39126 error can be a critical issue during data import operations using Oracle Data Pump. Understanding the causes, solutions, and troubleshooting steps can help database administrators and developers resolve the error efficiently. By following best practices and monitoring system resources, data integrity, and character set settings, you can minimize the risk of encountering the ORA-39126 error and ensure successful data import operations.

The Oracle error ORA-39126: Worker unexpected fatal error in KUPW$WORKER.PREPARE_DATA_IMP [71] is a generic "catch-all" internal error during a Data Pump import (impdp). It typically indicates that a worker process encountered an unhandled exception while preparing data for insertion. Primary Causes

Stale or Corrupt Dictionary Statistics: Inconsistent metadata in the database dictionary often causes the internal KUPW$WORKER package to fail.

Metadata Corruption: Corruption within the Data Pump utility or the DBMS_METADATA package can prevent the worker from correctly interpreting the dump file.

PDB Metadata Mismatch: If you are using Oracle 12c or higher, this error often occurs in Pluggable Databases (PDBs) where the Data Pump catalog is invalid or incomplete, frequently after a remote clone.

Empty Temporary Tablespace: While less common for code [71], an empty or incorrectly configured default temporary tablespace can trigger ORA-39126. Recommended Resolutions 1. Rebuild Data Pump Catalog

For most modern Oracle versions (12c+), the most effective fix is to rebuild the Data Pump utility packages to clear internal corruption.

Navigate to the admin directory: cd $ORACLE_HOME/rdbms/admin Execute as SYSDBA: SQL> @dpload.sql Use code with caution. Copied to clipboard

Note: In a Multitenant environment, ensure all PDBs are open and run this from the CDB. 2. Refresh Dictionary Statistics

Corrupt statistics can cause the worker to miscalculate data preparation. Run the following as SYSDBA:

exec dbms_stats.gather_dictionary_stats; exec dbms_stats.gather_fixed_objects_stats; Use code with caution. Copied to clipboard 3. Targeted Exclusion

If the error persists and is linked to specific objects, you can bypass the failure by excluding statistics or problematic schemas. Add EXCLUDE=STATISTICS to your impdp command.

If migrating between versions (e.g., 11g to 12c), avoid importing system schemas like SYSMAN or WMSYS. 4. Validate Environment Configuration

Temporary Tablespace: Ensure the default temporary tablespace is correctly assigned and has active tempfiles.

Check Invalid Objects: Run a script like utlrp.sql to recompile any invalid system packages, particularly those owned by SYS or XDB.

For more specific guidance, you can check the Oracle Community Discussion or consult Oracle Support Doc ID 1508068.1 on My Oracle Support.

The error ORA-39126: Worker unexpected fatal error in KUPW$WORKER.PREPARE_DATA_IMP [71] is a generic internal error in Oracle Data Pump that typically indicates an unhandled exception within the worker process during the data import preparation phase. Root Causes

Stale or Corrupt Statistics: One of the most common triggers for ORA-39126 during the preparation or metadata loading phase is stale dictionary or fixed object statistics.

Importing System Schemas: Attempting to import internal system-related schemas (like SYSMAN, SYS, or SYSTEM) along with application schemas can lead to internal conflicts.

Data Pump Utility Corruption: The Data Pump packages or catalog objects themselves may be invalid or corrupted within the database.

Data Emoticons/Characters: Specific internal bugs (such as BUG 19712212) have linked this error to the presence of emoticons or unusual characters within table statistics that the worker fails to process.

Known Bugs: Versions such as 12.1.0.2 may be affected by BUG 28307854, specifically when importing package bodies after applying certain proactive bundle patches. Troubleshooting and Solutions

You can resolve this error by following these standard recovery steps:

Regenerate StatisticsRefreshing the dictionary and fixed object statistics often clears internal metadata mismatches: EXEC DBMS_STATS.GATHER_DICTIONARY_STATS; EXEC DBMS_STATS.GATHER_FIXED_OBJECTS_STATS;

Exclude Statistics from ImportIf the error persists during the statistics processing phase, bypass it by adding the following parameter to your impdp command: EXCLUDE=STATISTICS

You can then manually gather statistics after the data has successfully imported.

Rebuild Data Pump ComponentsIf internal packages are corrupted, you may need to reload the Data Pump utility:

For Oracle 12c and higher: Connect as SYSDBA and run @$ORACLE_HOME/rdbms/admin/dpload.sql.

For older versions: Run @$ORACLE_HOME/rdbms/admin/catdp.sql.

Avoid SYSDBA for ImportsStandard practice is to perform imports using a user with the DATAPUMP_IMP_FULL_DATABASE role (like SYSTEM) rather than using the AS SYSDBA connection, which can cause unexpected behavior in worker processes.

Target Specific SchemasEnsure you are only importing application-specific schemas and explicitly excluding system-maintained schemas to prevent internal worker failures.

The error ORA-39126: Worker unexpected fatal error in KUPW$WORKER.PREPARE_DATA_IMP [71] is a generic "catch-all" internal error during an Oracle Data Pump import (impdp). It typically signifies an unhandled exception triggered by corrupted metadata, invalid system objects, or specific version incompatibilities. Common Root Causes

Stale or Corrupt Statistics: Stale dictionary or fixed object statistics can confuse the Data Pump worker process during the "prepare" phase. Oracle Data Pump is a cornerstone utility for

Invalid Data Pump Metadata: If the Data Pump internal packages (like KUPW$WORKER) are invalid or have become desynchronized, they will fail to process the import stream.

Unsupported Schema Import: Attempting to import system-related schemas (e.g., SYSMAN, XDB) across different versions or platforms frequently triggers this error.

Version Incompatibility: Specific bugs (e.g., Bug 28307854) in certain patch levels (like 12.1.0.2) can cause fatal errors when importing package bodies. Recommended Troubleshooting Steps

Revalidate and Rebuild Data Pump PackagesOften, the utility itself needs a reset. You can rebuild the Data Pump components by running these scripts as SYS: @$ORACLE_HOME/rdbms/admin/catdpx.sql

@$ORACLE_HOME/rdbms/admin/utlrp.sql (to recompile any resulting invalid objects).

Refresh Dictionary StatisticsClear out potential confusion in the optimizer by gathering fresh internal stats: EXEC DBMS_STATS.GATHER_DICTIONARY_STATS; EXEC DBMS_STATS.GATHER_FIXED_OBJECTS_STATS;.

Exclude Statistics from the ImportIf the error occurs while processing statistics, bypass them during the import and gather them manually later: Add EXCLUDE=STATISTICS to your impdp command line.

Narrow the Import ScopeIf migrating between different OS types or major versions (e.g., 11g Windows to 12c Linux), avoid importing all schemas at once. Explicitly include only your application schemas and exclude system schemas: EXCLUDE=SCHEMA:"IN ('SYSMAN', 'XDB', 'WMSYS')".

Check for Known PatchesCheck My Oracle Support for specific bug IDs like 28307854 or 18393005 if your database is on version 12.1 or 12.2, as these have known issues with ORA-39126.

Could you provide your Oracle Database version and the full impdp command you are running to help identify a more specific fix?

ORA-39126: Worker unexpected fatal error in KUPW$WORKER.PREPARE_DATA_IMP [71]

is a generic "unhandled exception" within the Data Pump worker process, typically occurring during the initial setup of an import job. While the code

identifies the specific internal routine failing, this error often stems from environment mismatches or corrupted Data Pump metadata. Potential Causes Permissions & Sessions : Running Data Pump as

can trigger unexpected behavior or performance issues; it is recommended to use a user with the DATAPUMP_IMP_FULL_DATABASE role instead. Metadata Corruption : The Data Pump packages or required views (like SYS.DBMS_METADATA ) might be invalid or missing. Version Mismatch

: Using a newer export version to import into an older database version without setting the parameter correctly. Resource Issues

: An empty or improperly configured default temporary tablespace can cause the worker process to fail during initial work item dispatch. Recommended Solutions

The Oracle error is a generic "catch-all" message indicating that a Data Pump worker process has encountered an unhandled exception. When specifically paired with the module KUPW$WORKER.PREPARE_DATA_IMP [71]

, it typically points to a failure during the initialization phase of a Data Pump Import ( The Anatomy of the Error

This error occurs when the worker process tries to set up the data loading environment but hits a condition it cannot recover from. The number in brackets, such as

, refers to a specific internal line or code path within the KUPW$WORKER

While the ORA-39126 message itself is often high-level, it is almost always accompanied by a second, more descriptive error in the log or trace file, such as ORA-01403: no data found ORA-06502: PL/SQL: numeric or value error Common Root Causes Corrupted Data Pump Metadata: If the internal packages used by Data Pump (like DBMS_METADATA

) are invalid or corrupted, the worker cannot prepare the import. Missing or Empty Temporary Tablespace:

The worker may fail if it cannot allocate necessary temporary space to manage the master table or metadata. Version Incompatibility:

Attempting to import a dump file from a newer Oracle version into an older database without using the parameter can cause internal worker failures. Invalid Objects in SYS/SYSTEM:

Invalid objects related to the Data Pump utility or XML processing can trigger this error during the "prepare" phase. Unsupported Datatypes: Tables containing specific datatypes like

or complex XML structures can occasionally cause the worker to crash during the initial data mapping. Recommended Solutions

Oracle Data Pump Error: Fatal Error in Worker Process

The Oracle Data Pump worker process encountered an unexpected fatal error while preparing data for import. The specific error code is "ora-39126" and the error message indicates that the issue occurred in the KUPW_WORKER.PREPARE_DATA_IMP module.

Error Details:

Possible Causes:

Recommended Actions:

If you are still experiencing issues, please provide more details about your environment, export file, and import process for further assistance.

The error "ORA-39126: Worker unexpected fatal error in KUPW-WORKER.PREPARE-DATA-IMP 71" occurs during an Oracle Data Pump import operation (using impdp). It indicates that a worker process encountered a critical, unexpected failure while preparing to load data into a table or partition. Additional information: The error is occurring in the

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