Resizing the redo_buffer

Hi all,
This post is with regard to the performance issue which I am facing rite now.
When applications are running there is 'Wait Events' are showing, application also running very slow,
I here by list the statistics of my redo_buffer,
Redo Buffers 7135232 bytes
Redo Buffer Waits
3131
Redo Buffer Waits
41
NAME VALUE
redo synch writes 148,331
redo synch time 6,401
redo blocks read for recovery 1,410
redo entries 503,067
redo size 168,676,236
redo buffer allocation retries 13
redo wastage 20,239,188
redo writer latching time 57
redo writes 79,839
redo blocks written 381,764
redo write time 10,986
NAME VALUE
redo log space requests 41
redo log space wait time 3,131
redo log switch interrupts 0
redo ordering marks 15,649
redo subscn max counts 0
16 rows selected.
If I want to increase the size of redo_buffer shall I do it dynamically?
Could you please recomend the estimated size based on the statstics above?
I am using Oracle 10g.
Thanks & Cheers
Antony

I apologise for the wrong info actually the parameter can be changable but you have to make the changes in the pfile.
Then you can have to bounce the database, but which alter system command it wont work.
If you want to resize the parameter then you should give all the other parameter like, buffer cache, large pool, shared pool and everything you have to maintain manually.
Instead of that if you are using 10g then give the parameter sga_target which will take care of everything.
SQL> show parameter spfile
NAME TYPE VALUE
spfile string /opt/app/oracle/app/oracle/pro
duct/10.1.0/db_1/dbs/spfiledba
1.ora
SQL> alter system set log_buffer = 1m scope=spfile;
alter system set log_buffer = 1m scope=spfile
ERROR at line 1:
ORA-02095: specified initialization parameter cannot be modified

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