We all know about the database block size. Remember db_block_size. But where the redo block size is defined.???

Answer is -> Redo block size is platform specific . It will the take the default value depending upon the operating system.

The easy way to find redo block size is to get trace of redolog and read that.

Below one is done on solaris platform:

1. Dump redolog:

2. Now check generated trace (it will under the same location where alert log is present)

cd /oracle/app/oracle/diag/rdbms/test1/TEST1/trace

cat TEST1_ora_26855.trc

Now here check the value of Blksiz , here it is 512 i.e 512 bytes.

 

So redolog block size in this database is of 512 bytes.