Hi Mitko,
alright, I did the same with
sparql select count(?conflict) where { ?conflict a
<http://dbpedia.org/ontology/MilitaryConflict> ; ?p
<http://dbpedia.org/ontology/Event> . ?p rdfs:subPropertyOf rdf:type ;
<http://www.w3.org/2006/time#hasBeginning> ?dateBegin . };
I also attached the plan for this count query at the bottom.
Cheers,
Martin
--- AFTER SERVER RESTART ---
SQL> status();
REPORT
VARCHAR
_______________________________________________________________________________
OpenLink Virtuoso Server
Version 06.01.3127-pthreads for Linux as of Apr 19 2010
Started on: 2010/04/23 13:39 GMT+120
Database Status:
File size 6257901568, 763904 pages, 408005 free.
2621440 buffers, 3193 used, 0 dirty 0 wired down, repl age 0 0 w. io 0
w/crsr.
Disk Usage: 3268 reads avg 0 msec, 0% r 0% w last 0 s, 134 writes,
25 read ahead, batch = 102. Autocompact 0 in 0 out, 0% saved.
Gate: 794 2nd in reads, 0 gate write waits, 0 in while read 0 busy scrap.
Log = data/narysubproperty.trx, 87 bytes
355829 pages have been changed since last backup (in checkpoint state)
Current backup timestamp: 0x0000-0x00-0x00
Last backup date: unknown
Clients: 1 connects, max 1 concurrent
RPC: 4 calls, 1 pending, 1 max until now, 0 queued, 0 burst reads (0%),
0 second brk=21520359424
Checkpoint Remap 19 pages, 0 mapped back. 0 s atomic time.
DB master 763904 total 408005 free 19 remap 0 mapped back
temp 256 total 251 free
Lock Status: 0 deadlocks of which 0 2r1w, 0 waits,
Currently 1 threads running 0 threads waiting 0 threads in vdb.
Pending:
Client 1111:1: Account: dba, 203 bytes in, 256 bytes out, 1 stmts.
PID: 8745, OS: unix, Application: unknown, IP#: 127.0.0.1
Transaction status: PENDING, 1 threads.
Locks:
Running Statements:
Time (msec) Text
87 status()
Replication Status: Server db-ALX-DEV03.
db-ALX-DEV03 db-ALX-DEV03 0 OFF.
Hash indexes
43 Rows. -- 88 msec.
SQL> select * from sys_d_stat where INDEX_NAME like 'RDF_QUAD%';
KEY_TABLE
INDEX_NAME
TOUCHES READS READ_PCT N_DIRTY N_BUFFERS
VARCHAR NOT NULL
VARCHAR
INTEGER INTEGER INTEGER INTEGER INTEGER
_______________________________________________________________________________
DB.DBA.RDF_QUAD
RDF_QUAD
4505 930 20 0 930
DB.DBA.RDF_QUAD
RDF_QUAD_GS
0 0 0 0 0
DB.DBA.RDF_QUAD
RDF_QUAD_OP
0 0 0 0 0
DB.DBA.RDF_QUAD
RDF_QUAD_POGS
432 1657 382 0 1657
DB.DBA.RDF_QUAD
RDF_QUAD_SP
3634 3 0 0 3
5 Rows. -- 292 msec.
--- QUERY ---
SQL> sparql select count(?conflict) where { ?conflict a
<http://dbpedia.org/ontology/MilitaryConflict> ; ?p
<http://dbpedia.org/ontology/Event> . ?p rdfs:subPropertyOf rdf:type ;
<http://www.w3.org/2006/time#hasBeginning> ?dateBegin . };
callret-0
INTEGER
_______________________________________________________________________________
4250
1 Rows. -- 9050 msec.
--- AFTER QUERY ---
SQL> status();
REPORT
VARCHAR
_______________________________________________________________________________
OpenLink Virtuoso Server
Version 06.01.3127-pthreads for Linux as of Apr 19 2010
Started on: 2010/04/23 13:39 GMT+120
Database Status:
File size 6257901568, 763904 pages, 408005 free.
2621440 buffers, 42470 used, 0 dirty 0 wired down, repl age 0 0 w. io
0 w/crsr.
Disk Usage: 42545 reads avg 0 msec, 0% r 0% w last 128 s, 134 writes,
227 read ahead, batch = 178. Autocompact 0 in 0 out, 0% saved.
Gate: 860 2nd in reads, 0 gate write waits, 0 in while read 0 busy scrap.
Log = data/narysubproperty.trx, 87 bytes
355829 pages have been changed since last backup (in checkpoint state)
Current backup timestamp: 0x0000-0x00-0x00
Last backup date: unknown
Clients: 2 connects, max 1 concurrent
RPC: 12 calls, 0 pending, 1 max until now, 0 queued, 6 burst reads
(50%), 0 second brk=21527314432
Checkpoint Remap 19 pages, 0 mapped back. 0 s atomic time.
DB master 763904 total 408005 free 19 remap 0 mapped back
temp 256 total 251 free
Lock Status: 0 deadlocks of which 0 2r1w, 0 waits,
Currently 1 threads running 0 threads waiting 0 threads in vdb.
Pending:
Client 1111:2: Account: dba, 702 bytes in, 1016 bytes out, 1 stmts.
PID: 8747, OS: unix, Application: unknown, IP#: 127.0.0.1
Transaction status: PENDING, 1 threads.
Locks:
Running Statements:
Time (msec) Text
84 status()
Replication Status: Server db-ALX-DEV03.
db-ALX-DEV03 db-ALX-DEV03 0 OFF.
Hash indexes
43 Rows. -- 86 msec.
SQL> select * from sys_d_stat where INDEX_NAME like 'RDF_QUAD%';
KEY_TABLE
INDEX_NAME
TOUCHES READS READ_PCT N_DIRTY N_BUFFERS
VARCHAR NOT NULL
VARCHAR
INTEGER INTEGER INTEGER INTEGER INTEGER
_______________________________________________________________________________
DB.DBA.RDF_QUAD
RDF_QUAD
17981 11244 62 0 11244
DB.DBA.RDF_QUAD
RDF_QUAD_GS
0 0 0 0 0
DB.DBA.RDF_QUAD
RDF_QUAD_OP
0 0 0 0 0
DB.DBA.RDF_QUAD
RDF_QUAD_POGS
3811901 30618 0 0 30618
DB.DBA.RDF_QUAD
RDF_QUAD_SP
3634 3 0 0 3
5 Rows. -- 273 msec.
--- QUERY PLAN ---
SQL> explain('sparql select count(?conflict) where { ?conflict a
<http://dbpedia.org/ontology/MilitaryConflict> ; ?p
<http://dbpedia.org/ontology/Event> . ?p rdfs:subPropertyOf rdf:type ;
<http://www.w3.org/2006/time#hasBeginning> ?dateBegin . }');
REPORT
VARCHAR
_______________________________________________________________________________
{
Precode:
0: $20 "callret" := Call min_bnode_iri_id ()
5: $21 "callret" := Call __i2idn (<constant (#i868)>)
10: $22 "callret" := Call __i2idn (<constant (#i1)>)
15: $23 "callret" := Call __i2idn (<constant (#i1030009)>)
20: $24 "callret" := Call __i2idn (<constant (#i1021055)>)
25: $25 "callret" := Call __i2idn (<constant (#i1021199)>)
30: BReturn 0
Fork 43
{
from DB.DBA.RDF_QUAD by RDF_QUAD_POGS 0.21 rows
Key RDF_QUAD_POGS ASC ($27 "s-1-1-t2.S")
<col=551 P = $21 "callret"> , <col=552 O = $22 "callret">
row specs: <col=552 O LIKE <constant (T�)>> , <col=550 S < $20 "callret">
from DB.DBA.RDF_QUAD by RDF_QUAD_POGS 0.22 rows
Key RDF_QUAD_POGS ASC ($32 "s-1-1-t1.P", $31 "s-1-1-t1.S")
<col=551 P = $27 "s-1-1-t2.S"> , <col=552 O = $24 "callret">
row specs: <col=552 O LIKE <constant (T�)>>
from DB.DBA.RDF_QUAD by RDF_QUAD 0.16 rows
Key RDF_QUAD ASC ($36 "s-1-1-t0.S")
inlined <col=551 P = $22 "callret"> , <col=550 S = $31 "s-1-1-t1.S"> ,
<col=552 O = $25 "callret">
row specs: <col=552 O LIKE <constant (T�)>>
Precode:
0: if ($36 "s-1-1-t0.S" 16( IS NULL ) <constant (0)>) then 3 else
8 unkn 8
3: $39 "callret" := := artm <constant (0)>
7: Jump 12 (level=0)
8: $39 "callret" := := artm <constant (1)>
12: BReturn 0
from DB.DBA.RDF_QUAD by RDF_QUAD 0.22 rows
Key RDF_QUAD ASC ()
inlined <col=551 P = $23 "callret"> , <col=550 S = $32 "s-1-1-t1.P">
row specs: <col=550 S < $20 "callret">
Local Code
0: if ($39 "callret" 16( IS NULL ) <none> ) then 15 else 3 unkn 15
3: if ($45 "callret-0" 16( IS NULL ) <none> ) then 6 else 11 unkn 15
6: $45 "callret-0" := := artm $39 "callret"
10: Jump 15 (level=0)
11: $45 "callret-0" := artm $45 "callret-0" + $39 "callret"
15: BReturn 0
}
Select ($45 "callret-0", <$42 "<DB.DBA.RDF_QUAD s-1-1-t3>" spec 5>, <$38
"<DB.DBA.RDF_QUAD s-1-1-t0>" spec 5>, <$34 "<DB.DBA.RDF_QUAD s-1-1-t1>"
spec 5>, <$29 "<DB.DBA.RDF_QUAD s-1-1-t2>" spec 5>)
}
49 Rows. -- 3 msec.
Am 22.04.2010 18:40, schrieb Mitko Iliev:
> Hi Martin,
>
> To eliminate the time to retrieve the result set do a 'sparql select
> count(*) where ( ... ) ' , this would give us the time to execute
> query server side. The rest is transmitting results to client, should
> see difference.
>
> Best Regards, Mitko
>
--
------------------------------------------------------------------------
Martin Gerlach
Research
Neofonie
Technologieentwicklung und
Informationsmanagement GmbH
Robert-Koch-Platz 4
10115 Berlin
fon: +49.30 24627 413
fax: +49.30 24627 120
[email protected] <mailto:[email protected]>
http://www.neofonie.de
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Geschaeftsfuehrung
Helmut Hoffer von Ankershoffen
(Sprecher der Geschaeftsfuehrung)
Nurhan Yildirim
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