結論：
在ORACLE 11.2.0.4版本資料庫中，清理資源回收筒與否，不影響EXPDP導出檔案的大小-即EXPDP不會導出資源回收筒中資料。
1.正常導出
SQL> select segment_name,bytes/1024/1024 mb from user_segments;
SEGMENT_NAME MB
------------------------------ ----------
T1 .0625
T2 38
PK_T .0625
SQL> show user
USER is "BYS"
SQL> select * from v$version;
BANNER
--------------------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
PL/SQL Release 11.2.0.4.0 - Production
CORE 11.2.0.4.0 Production
TNS for Linux: Version 11.2.0.4.0 - Production
NLSRTL Version 11.2.0.4.0 - Production
SQL> show recyclebin;
SQL>
SQL> select sysdate from dual;
SYSDATE
-------------------
2016/10/11 10:52:52
[[email protected] ~]$ expdp system/oracle DUMPFILE=test.dmp DIRECTORY=MY_DIR SCHEMAS=bys
Export: Release 11.2.0.4.0 - Production on Tue Oct 11 10:53:03 2016
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, Oracle Label Security, OLAP, Data Mining,
Oracle Database Vault and Real Application Testing options
FLASHBACK automatically enabled to preserve database integrity.
Starting "SYSTEM"."SYS_EXPORT_SCHEMA_01": system/******** DUMPFILE=test.dmp DIRECTORY=MY_DIR SCHEMAS=bys
Estimate in progress using BLOCKS method...
Processing object type SCHEMA_EXPORT/TABLE/TABLE_DATA
Total estimation using BLOCKS method: 38.06 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
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
Processing object type SCHEMA_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS
. . exported "BYS"."T2" 32.02 MB 152180 rows
. . exported "BYS"."T1" 5.437 KB 5 rows
Master table "SYSTEM"."SYS_EXPORT_SCHEMA_01" successfully loaded/unloaded
******************************************************************************
Dump file set for SYSTEM.SYS_EXPORT_SCHEMA_01 is:
/home/oracle/test.dmp
Job "SYSTEM"."SYS_EXPORT_SCHEMA_01" successfully completed at Tue Oct 11 10:53:17 2016 elapsed 0 00:00:12
##########################
2.删除表至資源回收筒，繼續導出
SQL> drop table t2;
Table dropped.
SQL> show recyclebin;
ORIGINAL NAME RECYCLEBIN NAME OBJECT TYPE DROP TIME
---------------- ------------------------------ ------------ -------------------
T2 BIN$Po7wBVOlB17gU9M5qMDlPg==$0 TABLE 2016-10-11:10:53:43
SQL>
SQL> select segment_name,bytes/1024/1024 mb from user_segments;
SEGMENT_NAME MB
------------------------------ ----------
T1 .0625
BIN$Po7wBVOlB17gU9M5qMDlPg==$0 38
PK_T .0625
[[email protected] ~]$ expdp system/oracle DUMPFILE=test1.dmp DIRECTORY=MY_DIR SCHEMAS=bys
Export: Release 11.2.0.4.0 - Production on Tue Oct 11 10:54:10 2016
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, Oracle Label Security, OLAP, Data Mining,
Oracle Database Vault and Real Application Testing options
FLASHBACK automatically enabled to preserve database integrity.
Starting "SYSTEM"."SYS_EXPORT_SCHEMA_01": system/******** DUMPFILE=test1.dmp DIRECTORY=MY_DIR SCHEMAS=bys
Estimate in progress using BLOCKS method...
Processing object type SCHEMA_EXPORT/TABLE/TABLE_DATA
Total estimation using BLOCKS method: 64 KB
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
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
Processing object type SCHEMA_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS
. . exported "BYS"."T1" 5.437 KB 5 rows
Master table "SYSTEM"."SYS_EXPORT_SCHEMA_01" successfully loaded/unloaded
******************************************************************************
Dump file set for SYSTEM.SYS_EXPORT_SCHEMA_01 is:
/home/oracle/test1.dmp
Job "SYSTEM"."SYS_EXPORT_SCHEMA_01" successfully completed at Tue Oct 11 10:54:23 2016 elapsed 0 00:00:11
[[email protected] ~]$ du -sh tes*
208K test1.dmp
4.0K test1.log
33M test.dmp
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