【翻译自mos文章】在12c中Create or Truncate Table时非常慢，等待事件为 DFS Lock Handle wait

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 20858716 - CREATE TABLE VERY SLOW

closed as duplicate of

Bug 20171986 - SLOW TRUNCATE ON 12.1.0.2 DUE TO "DFS LOCK HANDLE"

SOLUTION

Download and apply interim patch 20171986 .

REFERENCES

BUG:20858716 - CREATE TABLE VERY SLOW



NOTE:1597161.1 - ORA-00600 Upon 'alter Table [name] No Row Archival'