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Quad Store Configuration¤

Virtuoso setup¤

This section only covers setup options that have a direct impact on the interoperability between Explore and Virtuoso. There are far more options which can significantly improve the overall performance. For an overview of all configuration files and options of Virtuoso refer to the OpenLink Virtuoso Universal Server Documentation. Ensure to add the suggested parameters to the corresponding subsections of the configuration file before starting the server.

Compatibility¤

  • Virtuoso 7.2.4.2 - Explore is compatible with Virtuoso 7.2.4.2. Compatibility with other versions is not guaranteed.

Configuration¤

The following options apply to the Virtuoso configuration file virtuoso.ini. Check these options before starting Explore and adjust them if necessary.

SSL support¤

Mandatory configuration if sparqlEndpoints.virtuoso[i].sslEnabled=true. The server must have a valid certificate, which must be trusted by the system where Explore backend (DataPlatform) runs. In this case, the sparqlEndpoints.virtuoso[i].port property must point to the SSLServerPort.

[Parameters]
SSLServerPort      = 2111
;; Make sure that <PATH_TO_CERTS_DIR> is contained by DirsAllowed
SSLCertificate     = <PATH_TO_CERTS_DIR>/public-cert.pem
SSLPrivateKey      = <PATH_TO_CERTS_DIR>/private-key.pem

Transaction size limit (optional)¤

This option has impact on the maximum file size which can be uploaded using the SPARQL Graph Store endpoint and executing update queries.\ The maximum value you can set for this option is 2147483000 bytes.

[Parameters]
TransactionAfterImageLimit = <size_limit_in_bytes> # default 50000000

Database buffers¤

These options determine the amount of RAM used by Virtuoso to cache database files. To choose the appropriate values consult the virtuoso.ini file.

[Parameters]
NumberOfBuffers          = <size>
MaxDirtyBuffers          = <size>

ResultSet max rows¤

This setting is used to limit the number of rows in a result. The effective limit is the lowest value of this setting and the SPARQL query LIMIT clause value (if present). The exact value is situation-related and depends on the size of the datasets and the consequential number of returned rows. We recommend to set this option to 0 to disable the limitation.

[SPARQL]
ResultSetMaxRows = 0 # default 10000

GraphDB setup¤

This section covers only limitations and options which have a direct impact on the interoperability between Explore and GraphDB. For an overview of all configuration options of GraphDB refer to the official GraphDB documentation.

Compatibility ¤

  • GraphDB 9.2.0 - Explore is compatible with GraphDB version 9.2.0. Compatibility with newer versions is not guaranteed.

Configuration ¤

No specific configuration changes are needed in order to run with GraphDB.

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