1.Oracle数据泵导出schema时有报错：
Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Starting "SCOTT"."SYS_EXPORT_TABLE_01": scott/******** flashback_scn=3072010 tables=t dumpfile=t.dmp logfile=t.log directory=expdp
Estimate in progress using BLOCKS method...
Processing object type TABLE_EXPORT/TABLE/TABLE_DATA
Total estimation using BLOCKS method: 9 MB
Processing object type TABLE_EXPORT/TABLE/TABLE
Processing object type TABLE_EXPORT/TABLE/INDEX/INDEX
Processing object type TABLE_EXPORT/TABLE/INDEX/STATISTICS/INDEX_STATISTICS
Processing object type TABLE_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS
ORA-31693: Table data object "SCOTT"."T" failed to load/unload and is being skipped due to error:
ORA-02354: error in exporting/importing data
ORA-01466: unable to read data - table definition has changed
Master table "SCOTT"."SYS_EXPORT_TABLE_01" successfully loaded/unloaded
******************************************************************************
Dump file set for SCOTT.SYS_EXPORT_TABLE_01 is:
/home/oracle/expdp/t.dmp
Job "SCOTT"."SYS_EXPORT_TABLE_01" completed with 1 error(s) at 00:20:06
2.经过分析报错：
ORA-31693: Table data object "SCOTT"."T" failed to load/unload and is being skipped due to error:
说明是T表导出报错
ORA-01466: unable to read data - table definition has changed
可以分析是该表现在的表结构和导出时该表的结构发生了变化
3.重现该报错（测试环境还原场景）
SYS@PROD4 >conn scott/tiger;
Connected.
SCOTT@PROD4 >select current_scn from v$database;
CURRENT_SCN
-----------
3072010
SCOTT@PROD4 >desc t;
Name Null? Type
----------------------------------------------------- -------- ------------------------------------
OWNER VARCHAR2(30)
OBJECT_NAME VARCHAR2(128)
SUBOBJECT_NAME VARCHAR2(30)
OBJECT_ID NUMBER
DATA_OBJECT_ID NUMBER
OBJECT_TYPE VARCHAR2(19)
CREATED DATE
LAST_DDL_TIME DATE
TIMESTAMP VARCHAR2(19)
STATUS VARCHAR2(7)
TEMPORARY VARCHAR2(1)
GENERATED VARCHAR2(1)
SECONDARY VARCHAR2(1)
NAMESPACE NUMBER
EDITION_NAME VARCHAR2(30)
SCOTT@PROD4 >alter table t add country varchar2(20);
Table altered.
SCOTT@PROD4 >desc t;
Name Null? Type
----------------------------------------------------- -------- ------------------------------------
OWNER VARCHAR2(30)
OBJECT_NAME VARCHAR2(128)
SUBOBJECT_NAME VARCHAR2(30)
OBJECT_ID NUMBER
DATA_OBJECT_ID NUMBER
OBJECT_TYPE VARCHAR2(19)
CREATED DATE
LAST_DDL_TIME DATE
TIMESTAMP VARCHAR2(19)
STATUS VARCHAR2(7)
TEMPORARY VARCHAR2(1)
GENERATED VARCHAR2(1)
SECONDARY VARCHAR2(1)
NAMESPACE NUMBER
EDITION_NAME VARCHAR2(30)
COUNTRY VARCHAR2(20)
SCOTT@PROD4 >create directory expdp as '/home/oracle/expdp';
Directory created.
SCOTT@PROD4 >grant all on directory expdp to public;
Grant succeeded.
[oracle@edbjr2p2 ~]$ mkdir -p /home/oracle/expdp
[oracle@edbjr2p2 ~]$ chmod 777 -R /home/oracle/expdp/
[oracle@edbjr2p2 trace]$ expdp scott/tiger flashback_scn=3072010 tables=t dumpfile=t.dmp logfile=t.log directory=expdp
Export: Release 11.2.0.3.0 - Production on Sun Feb 16 00:19:54 2020
Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved.
Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Starting "SCOTT"."SYS_EXPORT_TABLE_01": scott/******** flashback_scn=3072010 tables=t dumpfile=t.dmp logfile=t.log directory=expdp
Estimate in progress using BLOCKS method...
Processing object type TABLE_EXPORT/TABLE/TABLE_DATA
Total estimation using BLOCKS method: 9 MB
Processing object type TABLE_EXPORT/TABLE/TABLE
Processing object type TABLE_EXPORT/TABLE/INDEX/INDEX
Processing object type TABLE_EXPORT/TABLE/INDEX/STATISTICS/INDEX_STATISTICS
Processing object type TABLE_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS
ORA-31693: Table data object "SCOTT"."T" failed to load/unload and is being skipped due to error:
ORA-02354: error in exporting/importing data
ORA-01466: unable to read data - table definition has changed
Master table "SCOTT"."SYS_EXPORT_TABLE_01" successfully loaded/unloaded
******************************************************************************
Dump file set for SCOTT.SYS_EXPORT_TABLE_01 is:
/home/oracle/expdp/t.dmp
Job "SCOTT"."SYS_EXPORT_TABLE_01" completed with 1 error(s) at 00:20:06