Hmm...I've never heard of this before, but it's apparently the number of
mmap()'ed areas you can have.
Documented here:
https://www.kernel.org/doc/Documentation/sysctl/vm.txt
(Search for 'max_map_count')
Hope that helps,
-Mark
PS The default is 65536, and since I've been running Oracle on Linux for a
while now, and I've never run into this parameter before, I'm guessing
there's (almost?) no way an Oracle database will ever hit this limit...?
On Tue, Nov 10, 2020 at 5:26 AM Johannes Vibe Djernæs <jodje@xxxxxxxxxxxx>
wrote:
Hi
I am configuring a couple of Oracle Linux Server release 6.8 and 6.10
servers with each 500G memory for an Oracle 11.2 db and is of cause
configuring them with appropriate HugePages.
However, I have come across the kernel parameter vm.max_map_count, but I
have not been able to find any solid description about how to determine an
appropriate value for this parameter and what should be considered
- do any of you have recommendations on that issue?
- maybe just a link to a propper description?
Cheers
Johannes
--
Johannes Vibe Djernæs
Mobil: +45 53 747 102
Miracle 42 A/S
Consulting & Managed Services
https://miracle42.dk
