Re: [Exist-open] eXist performance and memory consumption

[Wolfgang M. <wol...@gm...>]

> Is it possible for exist to tell me
> on which part of the query it spends most of the time, or maybe for
> eXist to tell me how it runs the query (like Oracle's explain plan),
> or am I looking in the wrong direction?

I recently added a pragma expression to measure the elapsed time for
selected parts of a larger query:

(# exist:timer #) { //some/path/expression }

This will print out timings for the given expression to the trace log.

It would be much nicer to have a profiler to automatically collect
timings for all relevant parts of a given query, but this feature is
still in the making. I'm also working on a better optimizer, which
will analyze the query at compile time and could thus generate an
explain plan. Right now, eXist chooses its optimizations at evaluation
time.

Well, right now I often help myself with an ordinary Java profiler.

Wolfgang