Imad,

could you possibly profile your queries (both a "fast" with few joins, "slow" with many joins, and "fast" with correlated subqueries) by prefixing them with PLAN, EXPLAIN, and TRACE (one at a time; see also http://www.monetdb.org/Documentation/Manuals/SQLreference/Runtime) and share the result with us for analysis?

Thanks! Stefan

----- Original Message -----

Hi Brian,

I dont think views will change performance, as the view query is evaluated each time, I think you mean indexed views, but they are not supported in monetdb.

the same query perform very well if i replace joins with correlated queries.

Thank you.

On Thu, Feb 20, 2014 at 4:51 AM, Brian Hood brianh6854@googlemail.com wrote:

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So many joins i think you need to review your process.

You could create a view however your still going to have to update your view which also isn't optimal.

All in all you need to streamline the data collection process.

However all data structures seem the same why not insert into the same table. ?

Regards

Brian

On Mon, Feb 17, 2014 at 10:44 AM, imad hajj chahine imad.hajj.chahine@gmail.com wrote:

...

Hi,

I have the following query that do a pivot for the data stored in different tables, the time of the query is acceptable as long as the number of table to join is up to 10, 10 to 15 the query take more than 90 seconds to return, above 15 it does not return. Is there something i am missing, or i have to slice my query in smaller joins and the join back the results?

PS: the max number of records in each table is < 200k

select tval1.value as countall,tval2.value as ana1,tval3.value as ana2,tval4.value as count5,tval5.value as min5,tval6.value as max5,tval7.value as sum5,tval8.value as avg5,tval9.value as count6,tval10.value as min6,tval11.value as max6,tval12.value as sum6,tval13.value as avg6,tval14.value as count7,tval15.value as min7,tval16.value as max7,tval17.value as sum7,tval18.value as avg7 from "RPME".t_entity_cache tec join "RPME".t_value_int_cache tval1 on tec.id_schema=tval1.id_schema and tec.id=tval1.id_entity and tval1.id_attribute=1 join "RPME".t_value_date_cache tval2 on tec.id_schema=tval2.id_schema and tec.id=tval2.id_entity and tval2.id_attribute=2 join "RPME".t_value_string_cache tval3 on tec.id_schema=tval3.id_schema and tec.id=tval3.id_entity and tval3.id_attribute=3 join "RPME".t_value_int_cache tval4 on tec.id_schema=tval4.id_schema and tec.id=tval4.id_entity and tval4.id_attribute=4 join "RPME".t_value_numeric_cache tval5 on tec.id_schema=tval5.id_schema and tec.id=tval5.id_entity and tval5.id_attribute=5 join "RPME".t_value_numeric_cache tval6 on tec.id_schema=tval6.id_schema and tec.id=tval6.id_entity and tval6.id_attribute=6 join "RPME".t_value_numeric_cache tval7 on tec.id_schema=tval7.id_schema and tec.id=tval7.id_entity and tval7.id_attribute=7 join "RPME".t_value_numeric_cache tval8 on tec.id_schema=tval8.id_schema and tec.id=tval8.id_entity and tval8.id_attribute=8 join "RPME".t_value_int_cache tval9 on tec.id_schema=tval9.id_schema and tec.id=tval9.id_entity and tval9.id_attribute=9 join "RPME".t_value_numeric_cache tval10 on tec.id_schema=tval10.id_schema and tec.id=tval10.id_entity and tval10.id_attribute=10 join "RPME".t_value_numeric_cache tval11 on tec.id_schema=tval11.id_schema and tec.id=tval11.id_entity and tval11.id_attribute=11 join "RPME".t_value_numeric_cache tval12 on tec.id_schema=tval12.id_schema and tec.id=tval12.id_entity and tval12.id_attribute=12 join "RPME".t_value_numeric_cache tval13 on tec.id_schema=tval13.id_schema and tec.id=tval13.id_entity and tval13.id_attribute=13 join "RPME".t_value_int_cache tval14 on tec.id_schema=tval14.id_schema and tec.id=tval14.id_entity and tval14.id_attribute=14 join "RPME".t_value_numeric_cache tval15 on tec.id_schema=tval15.id_schema and tec.id=tval15.id_entity and tval15.id_attribute=15 join "RPME".t_value_numeric_cache tval16 on tec.id_schema=tval16.id_schema and tec.id=tval16.id_entity and tval16.id_attribute=16 join "RPME".t_value_numeric_cache tval17 on tec.id_schema=tval17.id_schema and tec.id=tval17.id_entity and tval17.id_attribute=17 join "RPME".t_value_numeric_cache tval18 on tec.id_schema=tval18.id_schema and tec.id=tval18.id_entity and tval18.id_attribute=18 where tec.id_schema=3

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