客户系统alert log中出现大量的分布式延时信息：
Wed Jun 03 20:05:44 2015
DISTRIB TRAN HAIERMDM.f905907b.355.1.7544
  is local tran 355.1.7544 (hex=163.01.1d78)
  insert pending committed tran, scn=13510368365236 (hex=c49.a0b50ab4)
Wed Jun 03 20:05:44 2015
DISTRIB TRAN HAIERMDM.f905907b.355.1.7544
  is local tran 355.1.7544 (hex=163.01.1d78))
  delete pending committed tran, scn=13510368365236 (hex=c49.a0b50ab4)
Wed Jun 03 20:06:01 2015
DISTRIB TRAN HAIERMDM.f905907b.367.26.7664
  is local tran 367.26.7664 (hex=16f.1a.1df0)
  insert pending committed tran, scn=13510369096808 (hex=c49.a0c03468)
DISTRIB TRAN HAIERMDM.f905907b.288.26.1945
  is local tran 288.26.1945 (hex=120.1a.799)
  insert pending committed tran, scn=13510369097002 (hex=c49.a0c0352a)
Wed Jun 03 20:06:01 2015
DISTRIB TRAN HAIERMDM.f905907b.367.26.7664
  is local tran 367.26.7664 (hex=16f.1a.1df0))
  delete pending committed tran, scn=13510369096808 (hex=c49.a0c03468)
DISTRIB TRAN HAIERMDM.f905907b.288.26.1945
  is local tran 288.26.1945 (hex=120.1a.799))
  delete pending committed tran, scn=13510369097002 (hex=c49.a0c0352a)

该信息主要出现在RAC系统中，意思是：
当前系统存在分布式作业，正在等待其它节点完成作业。是一种延时提示。

如果未出现ORA-告警，其实是可以不理会的。

可以使用如下方式关闭oracle RAC分布式特性
alter system set _CLUSTERWIDE_GLOBAL_TRANSACTIONS=FALSE scope=spfile;

然后restart database ，生效。