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optional index strategies

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This commit is contained in:
Barak Michener 2015-07-14 21:43:09 -04:00
parent 3f391a782c
commit da391c3db7
2 changed files with 27 additions and 7 deletions
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5
graph/sql/iterator.go
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@ -95,12 +95,11 @@ func NewIterator(qs *QuadStore, d quad.Direction, val graph.Value) *Iterator {
}
func NewAllIterator(qs *QuadStore, table string) *Iterator {
var size int64
it := &Iterator{
uid: iterator.NextUID(),
qs: qs,
dir: quad.Any,
size: size,
size: qs.Size(),
table: table,
isAll: true,
}
@ -255,7 +254,7 @@ func (it *Iterator) Describe() graph.Description {
func (it *Iterator) Stats() graph.IteratorStats {
size, _ := it.Size()
if it.table == "nodes" {
if it.table == "nodes" || it.isAll {
return graph.IteratorStats{
ContainsCost: 1,
NextCost: 9999,

29
graph/sql/quadstore.go
View file

@ -61,10 +61,31 @@ func createSQLTables(addr string, options graph.Options) error {
glog.Errorf("Cannot create quad table: %v", quadTable)
return err
}
index, err := tx.Exec(`
CREATE INDEX pos_index ON quads (predicate, object, subject) WITH (FILLFACTOR = 50);
CREATE INDEX osp_index ON quads (object, subject, predicate) WITH (FILLFACTOR = 50);
`)
idxStrat, _, err := options.StringKey("db_index_strategy")
factor, factorOk, err := options.IntKey("db_fill_factor")
if !factorOk {
factor = 50
}
var index sql.Result
if idxStrat == "brin" {
index, err = tx.Exec(`
CREATE INDEX spo_index ON quads USING brin(subject) WITH (pages_per_range = 32);
CREATE INDEX pos_index ON quads USING brin(predicate) WITH (pages_per_range = 32);
CREATE INDEX osp_index ON quads USING brin(object) WITH (pages_per_range = 32);
`)
} else if idxStrat == "prefix" {
index, err = tx.Exec(fmt.Sprintf(`
CREATE INDEX spo_index ON quads (substr(subject, 0, 8)) WITH (FILLFACTOR = %d);
CREATE INDEX pos_index ON quads (substr(predicate, 0, 8)) WITH (FILLFACTOR = %d);
CREATE INDEX osp_index ON quads (substr(object, 0, 8)) WITH (FILLFACTOR = %d);
`, factor, factor, factor))
} else {
index, err = tx.Exec(fmt.Sprintf(`
CREATE INDEX spo_index ON quads (subject, predicate, object) WITH (FILLFACTOR = %d);
CREATE INDEX pos_index ON quads (predicate, object, subject) WITH (FILLFACTOR = %d);
CREATE INDEX osp_index ON quads (object, subject, predicate) WITH (FILLFACTOR = %d);
`, factor, factor, factor))
}
if err != nil {
glog.Errorf("Cannot create indices: %v", index)
return err