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https://issues.apache.org/jira/browse/JENA-2228?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17464505#comment-17464505
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Martin Pekár edited comment on JENA-2228 at 12/23/21, 12:38 PM:
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Walking around the code, I always end up at SolverLib. This class only uses the
node table (NodeTableNative I assume). Isn't the tuple table the main class for
B+ tree access? As far as I understand, the node table is used to convert nodes
to node IDs using a B+ tree, which is then used to search the B+ tree in the
tuple table.
Also, I formulated my latest question incorrectly: I want to find an access
method that takes several Nodes as input, like a tuple of Nodes.
was (Author: mrpekar):
Walking around the code, I always end up at SolverLib. This class only uses the
node table (NodeTableNative I assume). Isn't the tuple table the main class for
B+ tree access? As far as I understand, the node table is used to convert nodes
to node IDs using a B+ tree, which could then be uses to search the B+ tree in
the tuple table.
> Does Fuseki2 use TDB indexes or indexes for in-memory store?
> ------------------------------------------------------------
>
> Key: JENA-2228
> URL: https://issues.apache.org/jira/browse/JENA-2228
> Project: Apache Jena
> Issue Type: Question
> Components: Fuseki, TDB
> Affects Versions: Jena 3.17.0
> Environment: I am running the jena-fuseki-server-3.17.0.jar file from
> jena-fuseki2/jena-fuseki-server/target/ as follows
> {code:java}
> java -Xmx500g -jar fuseki-jenaclone.jar --tdb2 --loc=db/jena
> --timeout=1000000 /jena &{code}
> Reporter: Martin Pekár
> Priority: Major
> Fix For: Jena 3.17.0
>
>
> Based on logging messages inserted into various places in the indexes in the
> TDB module (NodeTupleTableConcrete, TupleIndexBase, NodeTableNative,
> BPlusTree), I can see that the B+ tree is only used once per query. I have
> inserted logging messages for every finding method to see which classes are
> used when querying. I would expect to the the B+ tree be used several times
> per query.
>
> I use the error logging level, and I inserted logging in the class
> constructors to make sure logging worked. I see construction of all the index
> classes.
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