关于Oracle Exadata Storage Server的Exafusion协议

大佬教程收集整理的这篇文章主要介绍了关于Oracle Exadata Storage Server的Exafusion协议，大佬教程大佬觉得挺不错的，现在分享给大家，也给大家做个参考。

本文转自:EXAFUSION - FAQ (文档 ID 2037900.1)

ApplIEs to:

Oracle Exadata Storage Server Software - Version 12.1.2.1.1 and later
linux x86-64

Purpose

This document describes the Frequently Asked Questions on Exafusion and the EXAFUSION_ENABLED parameter.@H_801_9@

Questions and Answers

what is Exafusion@H_801_9@

Exafusion is Direct-to-Wire protocol allows database processes to read and send Oracle Real Applications Cluster (Oracle RAC) messages directly over the Infiniband network bypassing the overhead of entering the OS kernel,and running the normal networking software stack. This improves the response time and scalability of the Oracle RAC environment on Oracle Exadata Database Machine. Data is transferred directly from user space to the Infiniband network,leading to reduced cpu utilization and better scale-out perfoRMANce. Exafusion is especially useful for olTP applications because per message overhead is particularly apparent in small olTP messages.

Exafusion Helps small messages by bypassing OS network layer overhead.@H_801_9@

what is the pre-requisite for Exafusion@H_801_9@

Oracle Exadata Storage Server Software release 12.1.2.1.1 or later.
Oracle Database software Release 12.1.0.2.0 BP11 or later.@H_801_9@ @H_579_8@mellanox ConnectX-2 and ConnectX-3 Host ChAnnel Adapters (HCAs) are required.
Oracle Enterprise Kernel 2 Quarterly update 5 (UEK2QU5) kernels (2.6.39-400.2nn) or later are required.@H_801_9@

@H_801_9@

How to Enable Exafusion@H_801_9@

Exafusion is Disabled by default.@H_801_9@

To enable Exafusion,set the EXAFUSION_ENABLED initialization parameter to 1.@H_801_9@

To disable Exafusion,set the EXAFUSION_ENABLED initialization parameter to 0.@H_801_9@

This parameter cAnnot be set dynamically. It must be set before instance startup.@H_801_9@

All of the instances in an Oracle RAC cluster must enable this parameter,or all of the instances in an Oracle RAC cluster must disable the parameter.@H_801_9@

KNown Issues
@H_801_9@

After upgrading database,users are not able to connect to the database from their OS login where as the same users are able to connect from OracLE OS user. It returns the following error while connecTing:@H_801_9@

ERROR: ORA-00600: internal error code,arguments: [ipc_create_que_1],[2],[8],[],[]@H_801_9@

This is caused by running EXAFUSION_ENABLED=1 on an unsupported version - lower than Exadata 12.1.0.2 BP 11.@H_801_9@

References

http://docs.Oracle.com/database/121/REFRN/GUID-A0612249-0A65-476D-A2B8-FA94DF5EEC7F.htm#CONTENT

大佬总结

以上是大佬教程为你收集整理的关于Oracle Exadata Storage Server的Exafusion协议全部内容，希望文章能够帮你解决关于Oracle Exadata Storage Server的Exafusion协议所遇到的程序开发问题。

如果觉得大佬教程网站内容还不错，欢迎将大佬教程推荐给程序员好友。

本图文内容来源于网友网络收集整理提供，作为学习参考使用，版权属于原作者。
如您有任何意见或建议可联系处理。小编QQ：384754419，请注明来意。