Hello,
I´m adjusting some oracle parameters but now I´m with some doubts regarding the log_buffer size value!
This is a production SAP system running on Oracle DB 11.2g (11.2.0.4) in a Windows Server 2012 (R2). The server has 24Gb of RAM memory and 8 CPU´s.
Some questions/doubts:
1. Which unit the log_buffer has? Bytes? (The default value in my database is 14254080).
2. I read the sap note 1431798 (Oracle 11.2.0: Database Parameter Settings) and then the sap note 1627481 (Preemptive redolog switches in Oracle 11.2 and higher) and in this last one I read some requirements (my server has 8 cores):
For systems with <= 16 cores set the logbuffer to 4MB or don't set it at all.
So... I changed the value (consider that parameter is in bytes unit) to 4194304 bytes (4 megabytes)
This is a good decision or not? Tell me your opinion please.
3. In the same sap note 1627481 I see the following statement:
If you have set the logbuffer to 4MB, then create redo logfiles of at least 200MB.This minimum configuration should only be used for DEV, Test or QA systems but not for production systems.
But I don´t understand... as I said before I set the log_buffer to 4MB but now I want to know which value I must set to the redo logfiles (origlogs and mirrlogs) in a production system. As you see the sap note only described the value for DEV, Test or QA systems, not for the production systems.
Which value is recommended for redolog files?
Can you answer to these three questions?
Any other recommendations?
Thank you,
Best regards,
João Dimas