来源于：

Create or Truncate Table Slow in 12c While Waiting for DFS Lock Handle wait (文档 ID 2085308.1)

APPLIES TO:

Oracle Database - Enterprise Edition - Version 12.1.0.2 and later

Information in this document applies to any platform.

SYMPTOMS

In 12c database, create or truncate table is very slow. High "DFS lock handle" waits are observed.  Same create or truncate statement runs faster in 11g.

CHANGES

 Upgraded to 12c

CAUSE

The issue is due to inmemory stats being flushed during the truncate of the parent segment. 

This has been discussed in below bugs:

Bug  - CREATE TABLE VERY SLOW

closed as duplicate of

Bug  - SLOW TRUNCATE ON 12.1.0.2 DUE TO "DFS LOCK HANDLE"

 

SOLUTION

Download and apply interim patch 20171986 .

 

REFERENCES

 - CREATE TABLE VERY SLOW

 - ORA-00600 Upon 'alter Table [name] No Row Archival'