In this section are various notes/examples relating to Unix (primarily AIX).

Filesystems

• View
• Mount/Unmount
• Users Using
• Space Used In
• Change Size

Performance

• IO
• Memory

Miscellaneous

• Vim/Vi
• Fifo special files
• Useful finds

In this section are various notes/examples relating to Oracle

• Estimate Rollback Time
• Maximum mbrc

You can estimate the time required for a rollback to finish using the following query
and a wall clock.

	select username
	,	sid
	,	status
	,	(select used_ublk from v$transaction
		where addr = v$session.taddr) ublocks
	from	v$session
	where	username = '&user';

Simply run the query and note the ublocks value. Then wait for a period of time
and run the query again. Subtract one from the other and you have a number of
blocks undone in a given period of time. The rest is easy.