On Sat, Apr 19, 2008 at 06:05:04PM -0700, mobigital1 wrote:
I was testing some queries, and for example this query has made the mserver5 process 100% CPU, which i could not kill and machine could not be rebooted.
running Fedora 8 64 bit.
query like this:
select col1, col2, sum(col3), sum(col4), sum(col5) from thetable group by col1, col2;
there are about 160 columns in the table.
col1 and col2 are "smallint" col3, col4, col5 are "real"
number of distinct values: in col1 is about 120 in col2 about 80
total number of rows in table is about 400M
I tested the query 2 times, simpler queries work ok, like this: select col1, count(*) from thetable group by col1;
this query has crashed mserver5 before, not sure if this already fixed: select col1, count(1) from thetable group col1;
Could you include the table definitions (ie the create table statements), without this its hard to debug. We recently run the SF-100 of tpch which includes a similar query (01) over 600M rows lineitem table, which didn't show problems. So we really need more data to fix this problem.
Niels
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