Answer / inder09

Offline redo log files are written to the oraarch directory;
their names are specified with help of Oracle instance
configuration parameters, so the name <DBSID>arch1_<LSN>.dbf
is just an example

Create a cron job to run a script to check percentage used /
capacity of oraarch directory. If it exceeds 80% run a
brarchive command to archive the logs.

archive directory containing all of SAP information for
backup restore purpose.
So I suggest you doing list out some questions from your
system which is the answer may impact the growth size of the
archive files in oraarch directory:

How much transaction happend by day?
Do the system doing extraction data from R3 to BW system?
are you doing reorganization table?
are you doing client copy?
Are you sure the archive backup (copy-del-save) run well
everyday?

Or you may analyze by your self the growth of the files in
oraarch directory by counting the files created by system
each day. After that you may make calculation how many
files average created each day.

Example:
created files by day (average) are 100 files (each files
20Mb by default)
so you will need:
100 x 20Mb = 2Gb => 3Gb

Always spare more space for archive directory, otherwise if
the directory
full the SAP system will stop responding.

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