About compilation time
t-mukork at microsoft.com
Thu Dec 3 23:50:05 CET 2015
Thank you Jannie,
By using explore I can see the mat version of the query.
In software stack page, https://www.monetdb.org/Documentation/Manuals/MonetDB/Architecture/SoftwareStack it is written that
Outputs of both the first and the second layer are MAL expressions. So do you have any idea about which layer does the EXPLORE command MAL output belongs to?
I am especially interested in the process between query submission and actual execution. So can you suggest me a starting point in the source code to explore more?
From: developers-list [mailto:developers-list-bounces+t-mukork=microsoft.com at monetdb.org] On Behalf Of Ying Zhang
Sent: Wednesday, December 2, 2015 7:47 AM
To: Communication channel for developers of the MonetDB suite. <developers-list at monetdb.org>
Subject: Re: About compilation time
I’m not aware that monetdb directly gives you this information. what you could try is to prefix your query with PLAN or EXPLAIN, which will limit a monetdb server to only generate the logical or physical execution plan for the query. Do this with client and server on the same machine, send the output to /dev/null, then you can measure the wall clock time. This should give you something usable.
For only the parsing time, I’m afraid you need to dig into the source code to add timing…
Not sure what parsing/compilation details you’re looking for, but you can have a look at the output of PLAN and EXPLAIN anyway.
> On Dec 01, 2015, at 20:29 , Mustafa Korkmaz <t-mukork at microsoft.com> wrote:
> Hello all,
> I’m conducting an experiment to show pros/cons of certain DBs and I
> need to investigate query compilation performance in details. For
> this, Is there any way to measure the elapsed time in query parsing/compilation time in MonetDB?
> Also is there any document out there to show the query parsing/compilation details?
> What I find for timing is only “-i” flag which gives an overall timing stat.
> I’d be glad for any help.
> Thank you
> Mustafa Korkmaz
> developers-list mailing list
> developers-list at monetdb.org
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