Pau Marc Munoz Torres wrote:
Hi
maybe i should give you some more explanations of my problem.
The reason for which i think that postgresql run out of memory is that: I
have a relation with 6 fields, 29 indexes and 32000 registers, the registers
where made up using a pgsql language to save disk space, and they "work"
(see the table schema under those lines)
You have 29 indexes on a table with 6 columns?
But only 32000 rows?
Column | Type | Modifiers
--------+--------------+-----------
id | integer |
p1 | character(1) |
p4 | character(1) |
p6 | character(1) |
p7 | character(1) |
p9 | character(1) |
Indexes:
"h2iab" btree (idr(p1, p4, p6, p7, p9, 'H-2*IAb'::character varying))
"h2iad" btree (idr(p1, p4, p6, p7, p9, 'H-2*IAd'::character varying))
"h2iak" btree (idr(p1, p4, p6, p7, p9, 'H-2*IAk'::character varying))
"h2ied" btree (idr(p1, p4, p6, p7, p9, 'H-2*IEd'::character varying))
etc.
OK, so you have 29 different functional indexes which use your columns
and then a fixed parameter. Looks odd to me, but I suppose you might
have good reason.
Oh - and it's not necessarily saving you any disk space - the index
values need to be stored.
when i do a query as:
select * from precalc where idr(p1, p4, p6, p7, p9, 'HLA-DRB1*0101')<-2; it
works and return 128030 registers
if i do
select * from precalc where idr(p1, p4, p6, p7, p9, 'HLA-DRB1*0101')>-2;
3071970 registers, it don't work
ERROR: relation "pssms" does not exist
CONTEXT: SQL statement "select score from PSSMS where AA= $1 and POS=1 and
MOLEC= $2 "
PL/pgSQL function "idr" line 11 at SQL statement
Do you have a table/view called pssms in your search-path? Because
that's what the error is about. Might it be a case-sensitive issue - do
you have a table called PSSMS instead?
if i ask for explanation for both queries works:
mhc2db=> explain select count(*) from precalc where idr(p1, p4, p6, p7, p9,
'HLA-DRB1*0101')<-2;
[snip]
mhc2db=> explain select count(*) from precalc where idr(p1, p4, p6, p7, p9,
'HLA-DRB1*0101')>-2;
[snip]
and the index used are the correct ones
If for that reason that i think that my machine runs out of memory, by the
way, this is not the biggest table that i have others have more than
503000000 registers, so if I try to do a cross select between tables it
could be worse.
For what reason? I still don't see any out-of-memory errors.
--
Richard Huxton
Archonet Ltd
