Re: minimal sga_target

Hi Nenad,

I don't remember exact formula and I'm on the phone, but as far as I remember it depends on the parameter "processes"

--
Best regards,
Sayan Malakshinov
Oracle performance tuning expert
Oracle Database Developer Choice Award winner
Oracle ACE Associate
http://orasql.org

On Wed, Jul 14, 2021, 16:09 Noveljic Nenad <nenad.noveljic_at_vontobel.com>
wrote:



> The following error is generated on startup if sga_target is too small:


>

>

>

> ORA-00821: Specified value of sga_target 1024M is too small, needs to be

> at least 2576M

>

>

>

> (I defined a very small sga_target just to reproduce this error.)

>

>

>

> The minimum 2576M seems to be host dependent, rather than hardcoded.

>

>

>

> The MOS note “DBCA Fails With ORA-00821 Error (sga_target Is Too Small)

> (Doc ID 2409633.1)” confirms my observation:

>

>

>

> “If DBCA cannot find the initialization parameter file, it calculates

> default values for processes and memory allocation. It uses the amount of

> RAM, the number of cores, and the number of threads to calculate these

> values and this can create a very large value for processes and increases

> the size of the SGA to accommodate that value.”

>

>

>

> How does Oracle calculate this minimum, i.e. 2576M?

>

>

>

> Best regards,

>

>

> Nenad

>

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