Before changing the access privileges, save your current settings. This procedure is only relevant for database instances up to version 7.4 (inclusive).
Enter the following commands:
cd /usr/sap
ls -lR > sap_perm.txt
cd /sapmnt
ls -lR > sap_sw.txt
cd
/sapdb/<SID>
ls -lR > sapdb_perm.txt (as of database version 7.5, only the root
user can access these directories, with either read or write
accesses)
To change the access privileges for a file or a directory, use the chmod command as shown below:
chmod <access_privileges_in_octal_format> <file_or_directory>
chmod 750 /sapdb/<SID>/sap*
chmod 750 /sapdb/<SID>/sapdata/*
chmod 750 /sapdb/<SID>/saplog/*
.
.
Do not use chmodrecursively. It is very easy to make unintended changes to authorizations when doing so.