MonetDB

See the MonetDB4 documentation: XQuery Documentation -> 3.1 The Mapi Client
Utility -> 3.1.2 Timing

The "Timer" value is not defined in the documentation, but what does it
measure?

When I run an mclient query using the -t option, I get numbers for the
following line items:

For example, query command:
mclient -t -lx -f none q0.xq

results in:

Trans 16.000 msec
Shred 0.000 msec
Query 31.000 msec
Print 0.000 msec
Timer 60.211 msec

So what does "Timer" measure? Is it the total cost, but it also appears to
measure something beyond query too?

=x=x=
OS=Windows XP
2GB RAM
MonetDB4 installed from latest stable build, August 2009 version.