RE: Oracle 12c Inmemory - don't stop thinking
- From: "Powell, Mark" <mark.powell2@xxxxxx>
- To: ORACLE-L <oracle-l@xxxxxxxxxxxxx>
- Date: Mon, 28 Jul 2014 17:15:22 +0000
If the information is wrong on in-memory being automatically enabled then I
apologize. It probably is not worth the trouble to try to find the original
Oracle posting where I found the information that it was enabled by default but
it I do I will see about updating the information.
-----Original Message-----
From: Kevin Jernigan [mailto:kevin.jernigan@xxxxxxxxxx]
Sent: Monday, July 28, 2014 1:03 PM
To: usn@xxxxxxxxx; Powell, Mark
Cc: ORACLE-L
Subject: Re: Oracle 12c Inmemory - don't stop thinking
In 12.1.0.2, inmemory_size is set to 0 by default, and unless it has a non-zero
value, usage of the Database In-Memory option will track as "false". Note that
the DBA has to go out of his/her way to set inmemory_size, as you must restart
the db instance for changes to non-zero values to take effect.
So, it is explicitly NOT TRUE that Database In-Memory is enabled by default -
and it's (IMHO) irresponsible (at best) to suggest otherwise...
-KJ
--
Kevin Jernigan
Senior Director Product Management
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Compression (HCC), Database File System
(DBFS), SecureFiles, Database Smart Flash Cache, Total Recall, Database
Resource Manager (DBRM), Direct NFS Client (dNFS), Continuous Query
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On 7/28/14, 7:14 AM, Martin Klier wrote:
> Hi,
>
> "enabled by default" - is not exactly true. The INMEMORY pool is zero
> by default, but I must confess I did not check how usage watermarks
> for the option are checked.
>
> Regards
> Martin
>
>
> Am 25.07.2014 18:36, schrieb Powell, Mark:
>> I will add that this feature while enabled by default is extra-cost, very
>> expensive extra-cost at that.
>>
>>
>> -----Original Message-----
>> Oracle tells us that InMemory will care for everything. But as usual,
>> the BUT is well covered. In my recent blog post
>>
>> "Oracle 12c InMemory - don't stop thinking about performance"
>> http://www.usn-it.de/index.php/2014/07/25/oracle-12c-inmemory-dont-st
>> op-thinking-about-performance/--
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