为了节省导出时间，也会需要排除统计信息，导入后需要手动收集统计信息，可以是数据库级别的，使用exec dbms_stats. gather_database_stats

当然如果想更快的话可以按照月初杨长老讲的并行统计信息收集，会稍微快一点点。

（1）统计信息是一些对象的统计信息，所以统计信息是对象的依赖，默认导出这些对象，如果使用默认参数，不显式指定，则会导出对象依赖的统计信息，即使你最小粒度导出单表，也会导出这个单表的依赖：索引、约束、权限、统计信息等，可以从下面例子清晰的看到这个结果。

$ expdp hr/hr directory=expdp tables=employees

Export: Release 11.2.0.4.0 - Production on Fri Apr 9 08:15:01 2021

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, Real Application Clusters, Automatic Storage Management, OLAP,
Data Mining and Real Application Testing options
Starting "HR"."SYS_EXPORT_TABLE_01":  hr/******** directory=expdp tables=employees 
Estimate in progress using BLOCKS method...
Processing object type TABLE_EXPORT/TABLE/TABLE_DATA
Total estimation using BLOCKS method: 64 KB
Processing object type TABLE_EXPORT/TABLE/TABLE
Processing object type TABLE_EXPORT/TABLE/GRANT/OWNER_GRANT/OBJECT_GRANT
Processing object type TABLE_EXPORT/TABLE/COMMENT
Processing object type TABLE_EXPORT/TABLE/INDEX/INDEX
Processing object type TABLE_EXPORT/TABLE/CONSTRAINT/CONSTRAINT
Processing object type TABLE_EXPORT/TABLE/INDEX/STATISTICS/INDEX_STATISTICS
Processing object type TABLE_EXPORT/TABLE/CONSTRAINT/REF_CONSTRAINT
Processing object type TABLE_EXPORT/TABLE/TRIGGER
Processing object type TABLE_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS
. . exported "HR"."EMPLOYEES"                            16.80 KB     107 rows
Master table "HR"."SYS_EXPORT_TABLE_01" successfully loaded/unloaded
******************************************************************************
Dump file set for HR.SYS_EXPORT_TABLE_01 is:
  /rman/expdp/expdat.dmp
Job "HR"."SYS_EXPORT_TABLE_01" successfully completed at Fri Apr 9 08:15:21 2021 elapsed 0 00:00:16

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（2）收集统计信息，楼上JiekeXu大佬已经讲过啦，用dbms_stats即可完成各个粒度统计信息收集。