Thanks Stefan. I have filed a bug report.
The Application iam working on would always have a single user and the data is never modified after initial load (though lots of select queries are run after initial load). Trying to configure monetDB to suit the scenario; i am thinking "--readonly" and "--single-user" options could avoid transactional overheads and concurrency (locking etc) overheads and give a better querying performace. Right now, i am only testing the concept to see if this gives better performace. Please do suggest if anything else can give us better quering results on monetDB.
Stefan Manegold wrote:
Hi Ramak,
I can reproduce your problem.
Could you please file a bug report via http://bugs.monetdb.org/ ?
Until we manage to locate and hopefully fix the problem, I'd recommend to simply omit the "--single-user" option --- everything seems to work fine without "--single-user".
What was/is your reason/need to use MonetDB in single-user mode?
Stefan
On Sun, Jun 12, 2011 at 09:59:37AM -0700, Ramak wrote:
Hi,
I am trying to use MonetDB in single user mode. While I could load the data using "COPY INTO" command and run a few select queries successfully, the moment i run a query with group by on more than one column, the server crashes saying " ---- >Segmentation fault". Is there a way to get around it? or, am I using it the wrong way? I could recreate the problem doing this---
- Start server with "sudo mserver5
--dbfarm='/home/user/work/tmp/data/test' --single-user" 2. start mclient (and create a simple table and fire a select query with group by on multiple columns)
create table test ( market_size int not null, market int not null,
state int not null);
select count(*) from test group by market_size, state;
-- server crashes on the above query.
I am using MonetDB 5 server v11.3.3 "Apr2011-SP1" (64-bit, 64-bit oids)
Thanks, Ram
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