i've ~325k triple count
fast
SELECT
?definition
?broader
?narrower
WHERE {
:eca0a3b72707f78df864e19481e8ec92 a skos:Concept .
OPTIONAL {
:eca0a3b72707f78df864e19481e8ec92 skos:definition ?definition .
}
OPTIONAL {
:eca0a3b72707f78df864e19481e8ec92 skos:broader ?broaderUri .
# enable this line will be slow ?broaderUri skosxl:prefLabel ?broaderLabel .
# ?broaderLabel skosxl:literalForm ?broader .
}
# OPTIONAL {
# :eca0a3b72707f78df864e19481e8ec92 skos:narrower ?narrowerUri .
# ?narrowerUri skos:prefLabel ?narrower
# }
}
slow
the problem is when i add "?broaderUri skosxl:prefLabel ?broaderLabel ." into query
its very slow
my use case is not all "subject" has such "predict"(skos:broader or skos:narrower etc)
SELECT
?definition
?broader
?narrower
WHERE {
:eca0a3b72707f78df864e19481e8ec92 a skos:Concept .
OPTIONAL {
:eca0a3b72707f78df864e19481e8ec92 skos:definition ?definition .
}
OPTIONAL {
:eca0a3b72707f78df864e19481e8ec92 skos:broader ?broaderUri .
?broaderUri skosxl:prefLabel ?broaderLabel .
# ?broaderLabel skosxl:literalForm ?broader .
}
# OPTIONAL {
# :eca0a3b72707f78df864e19481e8ec92 skos:narrower ?narrowerUri .
# ?narrowerUri skos:prefLabel ?narrower
# }
}
here is query plan
Distinct [#34]
`─ Projection(?definition, ?broader, ?narrower, ?broaderUri) [#34]
`─ NestedLoopJoinOuter(_) [#34]
+─ NestedLoopJoinOuter(_) [#34]
│ +─ Union [#34]
│ │ +─ Union [#5]
│ │ │ +─ Scan[SPOC](:eca0a3b72707f78df864e19481e8ec92, rdf:type, <http://www.w3.org/2004/02/skos/core#Concept>) [#1]
│ │ │ `─ PropertyPath(:eca0a3b72707f78df864e19481e8ec92 -> ?bjbccztv, minLength=1) [#4]
│ │ │ `─ Union [#2]
│ │ │ +─ Scan[POSC](?bjbccztv, <http://www.w3.org/2004/02/skos/core#narrower>, :eca0a3b72707f78df864e19481e8ec92) [#1]
│ │ │ `─ Scan[POSC](?bjbccztv, <http://www.w3.org/2004/02/skos/core#narrower>, :eca0a3b72707f78df864e19481e8ec92) [#1]
│ │ `─ Union [#29]
│ │ +─ PropertyPath(?jayatpds -> :eca0a3b72707f78df864e19481e8ec92, minLength=1, reversed) [#12]
│ │ │ `─ Union [#6]
│ │ │ +─ Scan[SPOC](:eca0a3b72707f78df864e19481e8ec92, <http://www.w3.org/2004/02/skos/core#narrower>, ?jayatpds) [#3]
│ │ │ `─ Scan[SPOC](:eca0a3b72707f78df864e19481e8ec92, <http://www.w3.org/2004/02/skos/core#narrower>, ?jayatpds) [#3]
│ │ `─ Union [#16]
│ │ +─ PropertyPath(:eca0a3b72707f78df864e19481e8ec92 -> ?nqjentph, minLength=1) [#12]
│ │ │ `─ Union [#6]
│ │ │ +─ Scan[SPOC](:eca0a3b72707f78df864e19481e8ec92, <http://www.w3.org/2004/02/skos/core#narrower>, ?nqjentph) [#3]
│ │ │ `─ Scan[SPOC](:eca0a3b72707f78df864e19481e8ec92, <http://www.w3.org/2004/02/skos/core#narrower>, ?nqjentph) [#3]
│ │ `─ PropertyPath(?tsdwflim -> :eca0a3b72707f78df864e19481e8ec92, minLength=1, reversed) [#4]
│ │ `─ Union [#2]
│ │ +─ Scan[POSC](?tsdwflim, <http://www.w3.org/2004/02/skos/core#narrower>, :eca0a3b72707f78df864e19481e8ec92) [#1]
│ │ `─ Scan[POSC](?tsdwflim, <http://www.w3.org/2004/02/skos/core#narrower>, :eca0a3b72707f78df864e19481e8ec92) [#1]
│ `─ Scan[SPOC](:eca0a3b72707f78df864e19481e8ec92, <http://www.w3.org/2004/02/skos/core#definition>, ?definition) [#1]
`─ MergeJoin(?broaderUri) [#1]
+─ Scan[PS_NOC](?broaderUri, <http://www.w3.org/2008/05/skos-xl#prefLabel>, _) [#44K]
`─ Scan[POSC](?broaderUri, <http://www.w3.org/2004/02/skos/core#narrower>, :eca0a3b72707f78df864e19481e8ec92) [#1]
Backup Storage Directory : .backup
CPU Load : 0.64 %
Connection Timeout : 10m
Export Storage Directory : .exports
Memory Heap : 874M (Max: 1.9G)
Memory Mode : DEFAULT{Starrocks.block_cache=20, Starrocks.dict_block_cache=10, Native.starrocks=70, Heap.dict_value=50, Starrocks.txn_block_cache=5, Heap.dict_index=50, Starrocks.memtable=40, Starrocks.untracked_memory=20, Starrocks.buffer_pool=5, Native.query=30}
Memory Query Blocks : 0B (Max: 373M)
Memory RSS : 1.2G
Named Graph Security : false
Platform Arch : x86_64
Platform OS : Mac OS X 10.15.7, Java 1.8.0_251
Query All Graphs : false
Query Timeout : 5m
Security Disabled : false
Stardog Home : /Users/monsterstep/dev/stardog_home
Stardog Version : 7.4.5
Strict Parsing : true
Uptime : 4 days 5 hours 4 minutes 56 seconds
Databases :
+----------+-------------+------------------------------------------------------+--------------------------------------------+
| | | Transactions | Queries |
+----------+-------------+-------+-------+-----------+---------------+----------+---------+-------+---------------+----------+
| Database | Connections | Open | Total | Avg. Size | Avg. Time (s) | Rate/sec | Running | Total | Avg. Time (s) | Rate/sec |
+----------+-------------+-------+-------+-----------+---------------+----------+---------+-------+---------------+----------+
| app | 0 | 0 | 6 | 565K | 8.445 | 0.000 | 0 | 661 | 26.001 | 0.002 |
| demo | 0 | 0 | 0 | 0 | 0.000 | 0.000 | 0 | 20 | 0.002 | 0.000 |
| lawtime | 0 | 0 | 0 | 0 | 0.000 | 0.000 | 0 | 8 | 0.000 | 0.000 |
| test | 0 | 0 | 0 | 0 | 0.000 | 0.000 | 0 | 8 | 0.000 | 0.000 |
+----------+-------------+-------+-------+-----------+---------------+----------+---------+-------+---------------+----------+