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2017-06-13T05:43:04.200547

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%META:TOPICPARENT{name="VirtTipsAndTricksGuide"}% ---+ Virtuoso Guide for Administering Your Sponger Instance %TOC% ---++ What? Configure Rate Limit in Virtuoso for administering Virtuoso Sponger Instance. ---++ Why? Use Rate Limit for search engine optimization statistics. ---++How? ---+++ACLs Rate Limit is configurable from <b>Virtuoso Conductor -> System Admin -> Security -> Access Control</b> where: * Regular expressions are not supported. * Patterns may be used; for example &mdash; <verbatim> -- like '%XXX' or -- XXX* </verbatim> * Rate limit is hits/per second from one IP address. For search engine optimization statistics for example can be set rate limit 10 (or even 100 so to start to collect statistics), and then to check with <code><nowiki>http_acl_stats()</nowiki></code> what values are returned. ---+++Service Rate Limits -- Sponger Level (controlling use of the service subject to resource settings in INI) The Virtuoso Rate Limiter uses the <code><nowiki>http_limited()</nowiki></code> function inside the Sponger <code>description.vsp</code> page to check if the number of running threads is more than the <code><nowiki>MaxRestrictedThreads</nowiki></code> parameter's value in the <code><nowiki>[ServerThreads]</nowiki></code> INI section. A <b>42000</b> error is signaled if over this limit. By default, there is no limit. If there are too many requests, then a <b><code>Limit exceeded</code></b> error will be signaled. This feature is enabled when <code><nowiki>[HTTPServer] MaxRestrictedThreads</nowiki></code> parameter value is less than <code><nowiki>[Parameters] ServerThreads</nowiki></code> parameter value in the Virtuoso INI. ---+++Client Connection Rate Limits Virtuoso instance Level (e.g., controlling at the IP level; that is, controlling connections from client addresses). ---+++Query Limits Query Limits can be set in the <code>[SPARQL]</code> Virtuoso INI section: <verbatim> ;virtuoso.ini ... [SPARQL] ;ExternalQuerySource = 1 ;ExternalXsltSource = 1 ResultSetMaxRows = 100000 ;DefaultGraph = http://localhost:8890/dataspace ;MaxQueryCostEstimationTime = 120 ; in seconds ;MaxQueryExecutionTime = 10 ; in seconds </verbatim> ---++Related * [[http://docs.openlinksw.com/virtuoso/wsacl.html#wsaclgenpurpacl][Virtuoso ACLs]] * [[VirtTipsAndTricksGuide][Virtuoso Tips and Tricks Collection]]

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