标题: 12.2 Multitenant: ORA-31655 and ORA-39166 When Exporting Objects from Applica... [打印本页] 作者: 刘泽宇 时间: 2025-11-9 18:15 标题: 12.2 Multitenant: ORA-31655 and ORA-39166 When Exporting Objects from Applica... 现象：
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Metadata linked tables (i.e tables created with sharing=metadata) are not exported from Application PDB. The objects are exported with success only with SYSTEM user, as shown below:
- a table can be unloaded by DataPump from an APP PDB with SYSTEM user, but it cannot be unloaded when expdp job is launched by the user who owns the table:
Connected to: Oracle Database 12c Enterprise Edition Release 12.2.0.1.0 - 64bit Production
Starting "SYSTEM"."SYS_EXPORT_TABLE_01": system/********@<application_pdb> DIRECTORY=dpump_dir dumpfile=dump_table.dmp tables=TC.TEST_TABLE logfile=table_log.log
Processing object type TABLE_EXPORT/TABLE/APPLICATION_DATA/TABLE_DATA
. . exported "TC"."TEST_TABLE" 0 KB 0 rows
Master table "SYSTEM"."SYS_EXPORT_TABLE_01" successfully loaded/unloaded
- starting the export job with the user who owns the table, it reports:
Connected to: Oracle Database 12c Enterprise Edition Release 12.2.0.1.0 - 64bit Production
Starting "TC"."SYS_EXPORT_TABLE_01": tc/********@<application_pdb> directory=dpump_dir dumpfile=dump_table.dmp tables=TC.TEST_TABLE logfile=2_table_log.log
ORA-39166: Object TC.TEST_TABLE was not found or could not be exported or imported.
ORA-31655: no data or metadata objects selected for job
原因：
The issue was investigated and solved in unpublished Bug 28009607 - 19.1CDB:ORA-39166 WHEN EXPDP WITH SHARING=METADATA TABLES, fixed starting with 19.1.
处理方法：
To avoid the issue, use any of below alternatives:
1/ Upgrade to 19.1.
- or -
2/ Apply Patch 28009607 if available for your version and platform.
To check for conflicting patches, please use the My Oracle Support (MOS) Patch Planner Tool. Reference Document 1317012.1 - How to Use MOS Patch Planner to Check and Request the Conflict Patches?
If no patch exists for your platform and version, please contact Oracle Support to request a fix.
- or -
3/ Use system user to export metadata-linked tables from an application PDB.