Fabio Panizzutti wrote:
storico=# explain select tag_id,valore_tag,data_tag from storico_misure
where (data_tag>'2004-05-03' and data_tag <'2004-05-12') and
tag_id=37423 ;

Can you please post explain analyze? That includes actual timings.

Looking at the schema, can you try "and tag_id=37423::integer" instead?

enable_hashagg = false
enable_hashjoin = false
enable_indexscan = true
enable_mergejoin = true
enable_nestloop = false
enable_seqscan = true
enable_sort = false
enable_tidscan = false

Why do you have these off? AFAIK, 7.4 improved hash aggregates a lot. So you might miss on these in this case.

# - Planner Cost Constants -

#effective_cache_size = 1000 # typically 8KB each

You might set it to something realistic.

And what is your hardware setup? Disks/CPU/RAM?

Just to be sure, you went thr.
http://www.varlena.com/varlena/GeneralBits/Tidbits/annotated_conf_e.html and http://www.varlena.com/varlena/GeneralBits/Tidbits/perf.html?



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