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  • Sparql 17-05-04 12:00:18.729信息：图形节点[Var this_0] 2017-05-04 12:00:18.729信息：GraphNode[IRI] 2017-05-04 12:00:18.729信息：GraphNode[IRI]]]]]]]

Sparql 17-05-04 12:00:18.729信息：图形节点[Var this_0] 2017-05-04 12:00:18.729信息：GraphNode[IRI] 2017-05-04 12:00:18.729信息：GraphNode[IRI]]]]]]]

sparql marklogic

Sparql 17-05-04 12:00:18.729信息：图形节点[Var this_0] 2017-05-04 12:00:18.729信息：GraphNode[IRI] 2017-05-04 12:00:18.729信息：GraphNode[IRI]]]]]]],sparql,marklogic,semantic-web,marklogic-8,Sparql,Marklogic,Semantic Web,Marklogic 8,根据您的硬件（内存、CPU、磁盘），您可以通过增加林的数量来提高性能 MarkLogic使用横向扩展架构，因此无法保证单台机器的可扩展性能。扩展的最佳方法是添加更多节点，特别是每个节点上都有足够内存的e节点。匹配查询的结果总数有多大？如果没有按排序，性能如何？我的问题是，这基本上需要运行与图形模式匹配的整个数据。如果我删除LIMIT子句并进行计数，它将计数约29000个三倍。好的，那么删除排序器如何？这应该快得多。我感兴趣的是更好地理解这个查询和数据——如果经过良好的优化，没有理由认为它是一个运

根据您的硬件（内存、CPU、磁盘），您可以通过增加林的数量来提高性能

MarkLogic使用横向扩展架构，因此无法保证单台机器的可扩展性能。扩展的最佳方法是添加更多节点，特别是每个节点上都有足够内存的e节点。

匹配查询的结果总数有多大？如果没有按排序，性能如何？我的问题是，这基本上需要运行与图形模式匹配的整个数据。如果我删除LIMIT子句并进行计数，它将计数约29000个三倍。好的，那么删除排序器如何？这应该快得多。我感兴趣的是更好地理解这个查询和数据——如果经过良好的优化，没有理由认为它是一个运行缓慢的查询。所以我想知道我们是否需要解决一些与语法相关的小错误。我会尝试的事情--*用要返回的特定变量替换'*'用ORDER BY XIt替换ORDER BY ASC（x）似乎很愚蠢，因为这个查询很慢——考虑到您请求的排序，我不喜欢选择索引。我知道这只是在查询，看看您是否可以影响计划，但我的下一个建议是删除rdf:type谓词。我的假设是rdf:type谓词是冗余的——我可能错了。接下来，我将尝试传递一个优化参数。从内置sem:sparql调用，这将是选项“optimize=2”作为第三个参数。在REST之上，有一个参数optimize=2。此选项增加了查找最佳查询计划所花费的时间。 
PREFIX  gj:   <http://mycompany.com/geonames-jurisdiction/1.0/schema#>
PREFIX  rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX  gn:   <http://www.geonames.org/ontology#>

SELECT  *
FROM <http://mycompany.com/geonames-jurisdiction/1.0/data>
FROM <http://mycompany.com/geonames-jurisdiction/1.0/rule-data>
WHERE
  { ?this_0  rdf:type  gj:LocalCounty ;
             gn:name   ?name_1 .
  }
ORDER BY ASC(?name_1)
LIMIT   100

INSERT {
  GRAPH <http://mycompany.com/geonames-jurisdiction/1.0/rule-data> {
    ?this gj:localCountyName ?name .
  }
}
WHERE {
    ?this a gj:LocalCounty .
    ?this gn:name ?name .
}

PREFIX  gj:   <http://mycompany.com/geonames-jurisdiction/1.0/schema#>
PREFIX  rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX  gn:   <http://www.geonames.org/ontology#>

SELECT ?this_0 ?name_1
FROM <http://mycompany.com/geonames-jurisdiction/1.0/data>
FROM <http://mycompany.com/geonames-jurisdiction/1.0/rule-data>
WHERE
  { ?this_0  rdf:type  gj:LocalCounty ;
             gj:localCountyName   ?name_1 .
  }
ORDER BY ?name_1
LIMIT   20

2017-05-04 12:00:18.684 Info: <triple-value-statistics count="147540458" unique-subjects="25064012" unique-predicates="81" unique-objects="67600843" xmlns="cts:triple-value-statistics">
2017-05-04 12:00:18.684 Info:   <triple-value-entries>
2017-05-04 12:00:18.684 Info:     <triple-value-entry count="8385355">
2017-05-04 12:00:18.684 Info:       <triple-value>http://www.w3.org/1999/02/22-rdf-syntax-ns#type</triple-value>
2017-05-04 12:00:18.684 Info:       <subject-statistics count="0" unique-predicates="0" unique-objects="0"/>
2017-05-04 12:00:18.684 Info:       <predicate-statistics count="8356279" unique-subjects="8341989" unique-objects="13"/>
2017-05-04 12:00:18.684 Info:       <object-statistics count="0" unique-subjects="0" unique-predicates="0"/>
2017-05-04 12:00:18.684 Info:     </triple-value-entry>
2017-05-04 12:00:18.684 Info:     <triple-value-entry count="29204">
2017-05-04 12:00:18.684 Info:       <triple-value>http://mycompany.com/geonames-jurisdiction/1.0/schema#LocalCounty</triple-value>
2017-05-04 12:00:18.684 Info:       <subject-statistics count="2" unique-predicates="2" unique-objects="2"/>
2017-05-04 12:00:18.684 Info:       <predicate-statistics count="0" unique-subjects="0" unique-objects="0"/>
2017-05-04 12:00:18.684 Info:       <object-statistics count="29202" unique-subjects="29202" unique-predicates="3"/>
2017-05-04 12:00:18.684 Info:     </triple-value-entry>
2017-05-04 12:00:18.684 Info:     <triple-value-entry count="29201">
2017-05-04 12:00:18.684 Info:       <triple-value>http://mycompany.com/geonames-jurisdiction/1.0/schema#localCountyName</triple-value>
2017-05-04 12:00:18.684 Info:       <subject-statistics count="0" unique-predicates="0" unique-objects="0"/>
2017-05-04 12:00:18.684 Info:       <predicate-statistics count="29201" unique-subjects="29201" unique-objects="26692"/>
2017-05-04 12:00:18.684 Info:       <object-statistics count="0" unique-subjects="0" unique-predicates="0"/>
2017-05-04 12:00:18.684 Info:     </triple-value-entry>
2017-05-04 12:00:18.684 Info:   </triple-value-entries>
2017-05-04 12:00:18.684 Info: </triple-value-statistics>
2017-05-04 12:00:18.684 Info: [Event:id=SPARQL AST] sessionKey=7777437449602930525
2017-05-04 12:00:18.684 Info:   initialPlan=SPARQLModule[
2017-05-04 12:00:18.684 Info:   Prolog[]
2017-05-04 12:00:18.684 Info:   SPARQLSelect[SPARQLLimit[
2017-05-04 12:00:18.684 Info:       LIMIT GraphNode[Literal "20"^^<http://www.w3.org/2001/XMLSchema#integer>]
2017-05-04 12:00:18.684 Info:       SPARQLProject[order(1)
2017-05-04 12:00:18.684 Info:         GraphNode[Var this_0 0]
2017-05-04 12:00:18.684 Info:         GraphNode[Var name_1 1]
2017-05-04 12:00:18.684 Info:         SPARQLOrder[order(1) UNSORTED
2017-05-04 12:00:18.684 Info:           OrderSpec[
2017-05-04 12:00:18.684 Info:             Variable[QName[(Unknown) name_1] 1]
2017-05-04 12:00:18.684 Info:             ASCENDING EMPTY MIN]
2017-05-04 12:00:18.684 Info:           SPARQLMergeJoin[order(0) hash(0==0) scatter()
2017-05-04 12:00:18.684 Info:             TriplePattern[order(0,1) PSO
2017-05-04 12:00:18.684 Info:               GraphNode[Var this_0 0]
2017-05-04 12:00:18.684 Info:               GraphNode[IRI <http://mycompany.com/geonames-jurisdiction/1.0/schema#localCountyName>]
2017-05-04 12:00:18.684 Info:               GraphNode[Var name_1 1]]
2017-05-04 12:00:18.684 Info:             TriplePattern[order(0) OPS
2017-05-04 12:00:18.684 Info:               GraphNode[Var this_0 0]
2017-05-04 12:00:18.684 Info:               GraphNode[IRI <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>]
2017-05-04 12:00:18.684 Info:               GraphNode[IRI <http://mycompany.com/geonames-jurisdiction/1.0/schema#LocalCounty>]]]]]]]]
2017-05-04 12:00:18.684 Info: [Event:id=SPARQL Cost Analysis] sessionKey=7777437449602930525 optimize=1 r=3 t=1.28811 os=360 is=15 mutations=9 seed=15212683942933123635
2017-05-04 12:00:18.684 Info:   initialCost=(m:6.02656e+07,r:0,io:(52.931/1.20414e+07/0),cpu(2):(0/116805/0),mem:87603,c:20,crd:[20,20])
2017-05-04 12:00:18.726 Info: [Event:id=SPARQL Cost Analysis] sessionKey=7777437449602930525 diff=0 diff%=0 r=0
2017-05-04 12:00:18.726 Info:   cost=(m:6.02656e+07,r:0,io:(52.931/1.20414e+07/0),cpu(2):(0/116805/0),mem:87603,c:20,crd:[20,20])
2017-05-04 12:00:18.726 Info: [Event:id=SPARQL Cost Analysis] sessionKey=7777437449602930525 diff=0 diff%=0 r=1
2017-05-04 12:00:18.726 Info:   cost=(m:6.02656e+07,r:0,io:(52.931/1.20414e+07/0),cpu(2):(0/116805/0),mem:87603,c:20,crd:[20,20])
2017-05-04 12:00:18.728 Info: [Event:id=SPARQL Cost Analysis] sessionKey=7777437449602930525 diff=0 diff%=0 r=2
2017-05-04 12:00:18.728 Info:   cost=(m:6.02656e+07,r:0,io:(52.931/1.20414e+07/0),cpu(2):(0/116805/0),mem:87603,c:20,crd:[20,20])
2017-05-04 12:00:18.728 Info: [Event:id=SPARQL Cost Analysis] sessionKey=7777437449602930525
2017-05-04 12:00:18.728 Info:   bestCost=(m:6.02656e+07,r:0,io:(52.931/1.20414e+07/0),cpu(2):(0/116805/0),mem:87603,c:20,crd:[20,20])
2017-05-04 12:00:18.729 Info: [Event:id=SPARQL AST] sessionKey=7777437449602930525
2017-05-04 12:00:18.729 Info:   plan=SPARQLModule[
2017-05-04 12:00:18.729 Info:   Prolog[]
2017-05-04 12:00:18.729 Info:   SPARQLSelect[SPARQLLimit[
2017-05-04 12:00:18.729 Info:       LIMIT GraphNode[Literal "20"^^<http://www.w3.org/2001/XMLSchema#integer>]
2017-05-04 12:00:18.729 Info:       SPARQLProject[order(1)
2017-05-04 12:00:18.729 Info:         GraphNode[Var this_0 0]
2017-05-04 12:00:18.729 Info:         GraphNode[Var name_1 1]
2017-05-04 12:00:18.729 Info:         SPARQLOrder[order(1) UNSORTED
2017-05-04 12:00:18.729 Info:           OrderSpec[
2017-05-04 12:00:18.729 Info:             Variable[QName[(Unknown) name_1] 1]
2017-05-04 12:00:18.729 Info:             ASCENDING EMPTY MIN]
2017-05-04 12:00:18.729 Info:           SPARQLMergeJoin[order(0) hash(0==0) scatter()
2017-05-04 12:00:18.729 Info:             TriplePattern[order(0,1) PSO
2017-05-04 12:00:18.729 Info:               GraphNode[Var this_0 0]
2017-05-04 12:00:18.729 Info:               GraphNode[IRI <http://mycompany.com/geonames-jurisdiction/1.0/schema#localCountyName>]
2017-05-04 12:00:18.729 Info:               GraphNode[Var name_1 1]]
2017-05-04 12:00:18.729 Info:             TriplePattern[order(0) OPS
2017-05-04 12:00:18.729 Info:               GraphNode[Var this_0 0]
2017-05-04 12:00:18.729 Info:               GraphNode[IRI <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>]
2017-05-04 12:00:18.729 Info:               GraphNode[IRI <http://mycompany.com/geonames-jurisdiction/1.0/schema#LocalCounty>]]]]]]]]