Change in Oracle Parameters and Log file size

Hello All,
We have scheduled DB Check job and the log file showed few errors and warnings in the oracle parameter that needs to be corrected. We have also gone through the SAP Note #830576 Oracle Parameter Configuration to change these parameters accordingly. However we need few clarifications on the same.
1.Can we change these parameters directly in init<SID>.ora file or only in SP file. If yes can we edit the same and change it or do we need to change it using BR tools.
2.We have tried to change few parameters using DB26 tcode. But it prompts for maintaining the connection variables in DBCO tcode. We try to make change only in default database but it prompts for connection variables.
Also we get check point error. As per note 309526 can we create the new log file with 100MB size and drop the existing one. Or are there any other considerations that we need to follow for the size of log file and creating new log file. Kindly advise on this. Our Environment is as follows.
OS: Windows 2003 Server
DB: Oracle 10g
regards,
Madhu

Hi,
Madhu, We can change oracle parameters at both the levels that is init<SID> as well as SPFILE level.
1. If you do the changes at init<SID> level then you have to generate the SPFILE again and then database has to be restarted for the parameters to take effect.
If you make the changes in SPFILE then the parameters will take effect depending on the parameter type whether it is dynamic or static. You also need to generate the PFILE i.e init<SID>.ora
2. If possible do not change the oracle parameters using the tcode. I would say it would be better if you do it via the database and it would be much easier.
3. Well its always good to have a larger redo log size. But only one thing to keep in mind is that once you change the size of the redolog the size of the archive log also changes although the number of files will decrease.
Apart from that there wont be any issues.
Regards,
Suhas

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