20180927-expdp备份ORA-ORA-31693/ORA-02354/ORA-00942

问题：

expdp日常备份时经常会有下面的报错

ORA-31693: Table data object "Chenjch"."VTZMWF8RG89LSV6YXXX" failed to load/unload and is being skipped due to error:
ORA-02354: error in exporting/importing data
ORA-00942: table or view does not exist

环境：

Oracle 11.2.0.1.0 for Windows Server 2012

问题原因：

expdp是先导出表结构，然后在导出数据，
报错的表都是一些临时堆表，在expdp导出表结构时这些表还存在，但是在导出完表结构到导出数据期间表被删除，导致后面导出数据时报错；

问题重现：

构建测试数据，在expdp导出完表结构到导出数据期间手动删除部分表，可以重现；
并且通过这次的expdp备份恢复的数据，是存在这些报错的表，只是没有数据；

1 创建测试数据

Oracle 11.2.0.4.0
SQL> create tablespace cjc_tbs datafile '/u01/app/oracle/oradata/orcltest/cjc_tbs01a.dbf' size 10M autoextend on;
SQL> create user chenjch identified by a default tablespace cjc_tbs;
SQL> grant connect,resource,dba to chenjch;
SQL> create directory dir_expdp as '/home/oracle/backup/expdp';
SQL> grant read,write on directory dir_expdp to public;
SQL> conn chenjch/a 
SQL> create table tt1 as select level as id from dual connect by level <=10;
SQL> create table tt2 as select level as id from dual connect by level <=10;
SQL> create table tt3 as select level as id from dual connect by level <=10;
SQL> create table tt4 as select level as id from dual connect by level <=10;
SQL> create table tt5 as select level as id from dual connect by level <=10;

SQL> 
declare
begin
  for i in 1 .. 10000000 loop
    insert into tt5 values (i);
    commit;
  end loop;
end;

2 expdp导出数据库，问题重现

SQL> create directory dir_expdp as 'D:\data';
SQL> grant read,write on directory dir_expdp to public;

[oracle@svnhost expdp]$ expdp chenjch/a directory=dir_expdp dumpfile=chenjch_20180927.dmp logfile=chenjch_20180927.log schemas=chenjch

Export: Release 11.2.0.4.0 - Production on Thu Sep 27 16:30:28 2018
Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.
Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Starting "CHENJCH"."SYS_EXPORT_SCHEMA_01":  chenjch/******** directory=dir_expdp dumpfile=chenjch_20180927.dmp logfile=chenjch_20180927.log schemas=chenjch 

Estimate in progress using BLOCKS method...
Processing object type SCHEMA_EXPORT/TABLE/TABLE_DATA
Total estimation using BLOCKS method: 120.2 MB
Processing object type SCHEMA_EXPORT/USER
Processing object type SCHEMA_EXPORT/SYSTEM_GRANT
Processing object type SCHEMA_EXPORT/ROLE_GRANT
Processing object type SCHEMA_EXPORT/DEFAULT_ROLE
Processing object type SCHEMA_EXPORT/PRE_SCHEMA/PROCACT_SCHEMA
Processing object type SCHEMA_EXPORT/TABLE/TABLE 

导出表结构后可以马上执行删除表进行测试(删除表tt1,tt2,tt3)

Processing object type SCHEMA_EXPORT/TABLE/COMMENT
Processing object type SCHEMA_EXPORT/TABLE/INDEX/INDEX
Processing object type SCHEMA_EXPORT/TABLE/CONSTRAINT/CONSTRAINT
Processing object type SCHEMA_EXPORT/TABLE/INDEX/STATISTICS/INDEX_STATISTICS
. . exported "CHENJCH"."TT5"                             94.31 MB 10000010 rows

问题重现

ORA-31693: Table data object "CHENJCH"."TT1" failed to load/unload and is being skipped due to error:  
ORA-02354: error in exporting/importing data
ORA-39826: Direct path load of view or synonym (CHENJCH.TT1) could not be resolved.
ORA-31693: Table data object "CHENJCH"."TT2" failed to load/unload and is being skipped due to error:
ORA-02354: error in exporting/importing data
ORA-39826: Direct path load of view or synonym (CHENJCH.TT2) could not be resolved.
ORA-31693: Table data object "CHENJCH"."TT3" failed to load/unload and is being skipped due to error:
ORA-02354: error in exporting/importing data
ORA-39826: Direct path load of view or synonym (CHENJCH.TT3) could not be resolved.
. . exported "CHENJCH"."TT4"                             5.070 KB      10 rows
Master table "CHENJCH"."SYS_EXPORT_SCHEMA_01" successfully loaded/unloaded
******************************************************************************
Dump file set for CHENJCH.SYS_EXPORT_SCHEMA_01 is:
  /home/oracle/backup/expdp/chenjch_20180927.dmp
Job "CHENJCH"."SYS_EXPORT_SCHEMA_01" completed with 3 error(s) at Thu Sep 27 16:30:44 2018 elapsed 0 00:00:15

3 导入数据进行测试

SQL> create user chenjch1 identified by a default tablespace cjc_tbs;
SQL> grant connect,resource,dba to chenjch;
[oracle@svnhost expdp]$ impdp chenjch/a directory=dir_expdp dumpfile=chenjch_20180927.dmp logfile=chenjch_impdp_20180927.log remap_schema=chenjch:chenjch1

Import: Release 11.2.0.4.0 - Production on Thu Sep 27 17:06:33 2018
Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.
Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Master table "CHENJCH"."SYS_IMPORT_FULL_01" successfully loaded/unloaded
Starting "CHENJCH"."SYS_IMPORT_FULL_01":  chenjch/******** directory=dir_expdp dumpfile=chenjch_20180927.dmp logfile=chenjch_impdp_20180927.log remap_schema=chenjch:chenjch1 
Processing object type SCHEMA_EXPORT/USER
ORA-31684: Object type USER:"CHENJCH1" already exists
Processing object type SCHEMA_EXPORT/SYSTEM_GRANT
Processing object type SCHEMA_EXPORT/ROLE_GRANT
Processing object type SCHEMA_EXPORT/DEFAULT_ROLE
Processing object type SCHEMA_EXPORT/PRE_SCHEMA/PROCACT_SCHEMA
Processing object type SCHEMA_EXPORT/TABLE/TABLE
Processing object type SCHEMA_EXPORT/TABLE/TABLE_DATA
. . imported "CHENJCH1"."TT5"                            94.31 MB 10000010 rows
. . imported "CHENJCH1"."TT4"                            5.070 KB      10 rows
Job "CHENJCH"."SYS_IMPORT_FULL_01" completed with 1 error(s) at Thu Sep 27 17:06:45 2018 elapsed 0 00:00:11

SQL> conn chenjch1/a
Connected.

SQL> select * from tab;
TNAME        TABTYPE CLUSTERID
------------------------------ ------- ----------
TT1        TABLE
TT2        TABLE
TT3        TABLE
TT4        TABLE
TT5        TABLE

SQL> select * from tt1;
no rows selected

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