How to find your log block size?

You can find your log block size in bytes with the following query (connected as SYS or internal):
select distinct lebsz from x$kccle;

This is the unit in which you should set the log_checkpoint_interval parameter (otherwise known as the operating system block size). Some sample sizes are:

O/S Log Block Size
======= ==============
Solaris 512 bytes
HP-UX 1024 bytes
NT 512 bytes
OpenVMS 512 bytes
Digital UNIX 1024 bytes
To get it from the operating system, try grep DEV_BSIZE /usr/include/sys/param.h

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