?
Solved

Configure Hugepage

Posted on 2014-12-04
3
Medium Priority
?
145 Views
Last Modified: 2014-12-06
I see the following message in the alert log when the database is restarted:
"ECOMMENDATION:
  Total System Global Area size is 12 GB. For optimal performance,
  prior to the next instance restart:
  1. Increase the number of unused large pages by
 at least 6145 (page size 2048 KB, total size 12 GB) system wide to
  get 100% of the System Global Area allocated with large pages
  2. Large pages are automatically locked into physical memory.
 Increase the per process memlock (soft) limit to at least 12 GB to lock
 100% System Global Area's large pages into physical memory

Multiplying the 6145 by 2048 i get 12584960 . If i have 12G SGA would i not be going over the max if i use the figures given by Oracle in the alert log?
If so, is that of any consequence?
0
Comment
Question by:xoxomos
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 
LVL 12

Accepted Solution

by:
Praveen Kumar Chandrashekatr earned 2000 total points
ID: 40482139
Hugespages enables the Kernel to manage large pages of memeory in addition standard 4k (32 bit) or 16k (64 bit) pages size.

Here is the document on Huges pages

https://docs.oracle.com/cd/E37670_01/E37355/html/ol_about_hugepages.html

and here is teh configuration steps

http://oracle-base.com/articles/linux/configuring-huge-pages-for-oracle-on-linux-64.php

http://kevinclosson.net/2010/09/28/configuring-linux-hugepages-for-oracle-database-is-just-too-difficult-part-i/
0
 

Author Comment

by:xoxomos
ID: 40484275
Thanks.  What i'm unclear about is what would be the consequences of my allocation to hugepages is greater than my SGA size?
0
 

Author Comment

by:xoxomos
ID: 40484627
Well the system came up ok (for now) as it is so I guess i will find out  what the impact is if any.
0

Featured Post

Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Introduction A previously published article on Experts Exchange ("Joins in Oracle", http://www.experts-exchange.com/Database/Oracle/A_8249-Joins-in-Oracle.html) makes a statement about "Oracle proprietary" joins and mixes the join syntax with gen…
Using SQL Scripts we can save all the SQL queries as files that we use very frequently on our database later point of time. This is one of the feature present under SQL Workshop in Oracle Application Express.
Via a live example show how to connect to RMAN, make basic configuration settings changes and then take a backup of a demo database
Via a live example, show how to take different types of Oracle backups using RMAN.

764 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question