RE: Oracle 12c Inmemory - don't stop thinking

From: Powell, Mark <mark.powell2_at_hp.com>
Date: Mon, 28 Jul 2014 17:15:22 +0000
Message-ID: <1E24812FBE5611419EFAFC488D7CCDD126EDC0B7_at_G6W2491.americas.hpqcorp.net>



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_at_oracle.com] Sent: Monday, July 28, 2014 1:03 PM
To: usn_at_usn-it.de; 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
Advanced Compression, Hybrid Columnar
Compression (HCC), Database File System (DBFS), SecureFiles, Database Smart Flash Cache, Total Recall, Database Resource Manager (DBRM), Direct NFS Client (dNFS), Continuous Query Notification (CQN), Index Organized Tables (IOT), Information Lifecycle Management (ILM) +1-650-607-0392 (o)
+1-415-710-8828 (m)

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/--

†Ûiÿü0ÁúÞzX¬¶Ê+ƒün– {ú+iÉ^ Received on Mon Jul 28 2014 - 19:15:22 CEST

Original text of this message