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Configure Hugepage

Posted on 2014-12-04
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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?
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Question by:xoxomos
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Accepted Solution

by:
Praveen Kumar Chandrashekatr earned 500 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/
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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.
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