Redo Logs Recomended Size - Losg switch Recomended Time ?

Question

Dear Gurus,
help me to find out a solution for this equation :
A consultant told me that the Redo log should follow this rules :
- Terminate file extension by ".rdo" instead of ".log" to avoid confusion !!!!!!!!!!!!! Help I'm already Confused
R:
- Have a Size of min 500M to avoid Contetntion !!!! the bigger are the redologs the less contention !!!!!!!!!!!!!!!
R:
- And the Top : The log switch should take place every 15-20 min this means the Redo are optimized !!!!!!!!!!!!!!!!!
R:
Helpppppp.......
What's your opinion?
is this true? is this ORS (Oracle Recomendatio Standard) ???
Thxs
Otherwise I quite DBA I go to sell chickens

Answer 1

Regarding question 1:
Oracle standard ( Oracle Flexible Architecture) is a guideline to achieve file and directory structure naming across systems.
There is no MUST in naming conventions. So if you like to call the files .log, then make it so.
Our files are called "redo<SID>01.log" , "redo<SID>02.log", etc...
Question 2:
This Oracle consultant hint is the same as the oner of question 3
Preferably make the files that big, so a log-switch takes place every 15 minutes.
But that kind of advice is obsolete nowadays. The systems and especially the disks are that fast that a higher rate of logswitches might not be problematic.
Just then create enough files to avoid contention ( contention here is: all files are occupied, either by the database, or the archiver)
Then again, is 15 minutes of data-loss acceptable for your company, because that is the consequence of a disk-crash that destroys the redo-files.
If this is too much data to loose, then your files should apparently switchover more often and therefore you should have a lot of small redo-files