Before diving into complex fixes, perform these initial steps to isolate the problem:
SELECT * FROM v$pgastat;
) are invalid or corrupted, the worker cannot prepare the import. Missing or Empty Temporary Tablespace:
The rows began to flow again. 95%. 96%.
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. Before diving into complex fixes, perform these initial
The ORA-39126 error indicates that an unhandled exception was detected internally within a worker process during a Data Pump job, whether export or import. Oracle's official documentation classifies this as an internal error that may require contacting Oracle Support for resolution. However, in many cases, the root cause is known, and specific workarounds or patches exist.
Before running a Data Pump export, refresh your dictionary stats using DBMS_STATS.GATHER_DICTIONARY_STATS to avoid corrupt or stale metadata parsing blocks.
: The Data Pump packages or catalog objects themselves may be invalid or corrupted within the database.
Run the Import with METRICS=YESAdd METRICS=YES and LOGTIME=ALL to your IMPDP command. This provides a more granular view of exactly which object the worker was "preparing" when it failed. Recommended Solutions By following best practices and monitoring system resources,
: 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.
He refreshed the logs. Everything looked perfect. Total processed: 88%. Then, the cursor stopped blinking.
Oracle Bug 27155601, Bug 31145156, and similar internal bugs related to object types, partitioning, or virtual columns are notorious for triggering ORA-39126 at line or block 71. Step-by-Step Troubleshooting Checklist
The full error message usually appears as: line 95 ORA-06512: At SYS.KUPW$WORKER
The terminal sat silent for a moment. Arthur watched the KUPW$WORKER process spin up again.
Run @?/rdbms/admin/utlrp.sql as SYSDBA to recompile all invalid PL/SQL and Java objects.
This error typically occurs during the phase ( impdp ), specifically when the Data Pump worker process is preparing to load data into a table. The error is a "wrapper" or "umbrella" error—meaning it signals a fatal failure, but the root cause is often hidden in a secondary error stack or requires deep investigation.
, it typically points to a failure during the initialization phase of a Data Pump Import ( The Anatomy of the Error
Worker unexpected fatal error in KUPW$WORKER.PREPARE_DATA_IMP [71] ORA-06512: At SYS.DBMS_SYS_ERROR , line 95 ORA-06512: At SYS.KUPW$WORKER , line 9001