Query on ALTER SYSTEM SET


Hello

I was under the impression that

"PFILE has limitation to change settings for initialization of dynamically. If any initialization parameter must be changed, we can edit the pfile parameter changes take effect with the next restart of the system

To work around this limitation, Oracle has created the concept of the SPFILE initialization parameter can be changed dynamically using ALTER SYSTEM SET statement. »

But, today, I started my test using PFILE database and run the following command to change the setting of the memory_target from 300 to 290 M.

ALTER SYSTEM SET memory_target = 290 M;

And to my surprise, this statement executed correctly without errors and memory_target parameter has been set to the new value (of course, in memory).

Isn't it change the init dynamically using PFILE itself?

Please clarify my doubt and correct my understanding.

Kind regards

Bharath

bharathDBA wrote:

Hello

I was under the impression that

"PFILE has limitation to change settings for initialization of dynamically. If any initialization parameter must be changed, we can edit the pfile parameter changes take effect with the next restart of the system

To work around this limitation, Oracle has created the concept of the SPFILE initialization parameter can be changed dynamically using ALTER SYSTEM SET statement. »

But, today, I started my test using PFILE database and run the following command to change the setting of the memory_target from 300 to 290 M.

ALTER SYSTEM SET memory_target = 290 M;

And to my surprise, this statement executed correctly without errors and memory_target parameter has been set to the new value (of course, in memory).

Isn't it change the init dynamically using PFILE itself?

Please clarify my doubt and correct my understanding.

Kind regards

Bharath

You have a bad mixing on the genesis of the SPFILE. Yes, it is a binary file and all this but remember, isn't the SPFILE which makes a dynamic parameter or a PFILE that makes static, but it is the nature of the setting itself which allows to happen. Yes, the difference in the PFILE and SPFILE parameter would be obvious when you change a dynamic parameter, and would give a rebound to the db. Since the PFILE file has not been updated (it's a text file must be updated manually), with the next restart, the setting would take the same value as it has in the PFILE file. But with the SPFILE, depending on what you have set in SCOPE, the parameter should behave accordingly.

HTH

Aman...

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