Re: Server is swapping with free memory available

I would check your swapiness value is not set to 60 and set it to 1, and move to hugepages
So that your main memory can’t be swapped out.

On Wed, 20 Mar 2019 at 07:53, <niall.litchfield_at_gmail.com> wrote:

> HI Upendra
>
> On Wed, Mar 20, 2019 at 2:51 AM Upendra nerilla <nupendra_at_hotmail.com>
> wrote:
>
>>
>> - disk_asynch_io = true
>>
>> As I think someone else pointed out if you don't use direct IO then the
> datafiles will be cached in the FS cache as well as the database blocks
> being cached in the buffer cache. It's fairly unlikely that this will be as
> effective as direct IO, especially on a server with multiple databases on
> it. Certainly though, so long as the total size of all the databases is
> larger than the filesystem cache you will get the swapping you observe.
>
>>
>> - We aren't currently using HUGEPAGES, I would like to configure
>> them, but wanted to get this issue fixed before moving into that direction
>>
>> You have two very large SGAs. I suggest you run grep PageTables
> /proc/meminfo to see how much memory is being used by them. I suspect you
> will be surprised, assuming you have several hundred sessions for each
> database - which doesn't look unreasonable to assume with such large SGAs
> then I expect tens of GB of PageTable entries. .
>
>

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