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%META:TOPICPARENT{name="VirtTipsAndTricksGuide"}% ---++Can I drop and re-create the DefaultQuadStorage? Currently system metadata consist of three "levels": 1 <b>QuadMapFormats</b> are used to describe transformations of individual SQL values (or types of SQL values), 1 <b>QuadMaps</b> refers to <b>QuadMapFormats</b> (via <b>QuadMapValues</b>) and describe some "minimal" independent RDB2RDF transformations, 1 <b>QuadStorages</b> organizes <b>QuadMaps</b>. <b>QuadStorages</b> contains only "symlinks" to maps, if you drop a storage you don't drop all mappings inside. If you drop the <b>DefaultQuadStorage</b> or some other built-in thing, it can be safely recovered by [[http://docs.openlinksw.com/virtuoso/fn_rdf_audit_metadata.html][DB.DBA.RDF_AUDIT_METADATA]], with first parameter set to 1. This will keep your own data intact. However we recommend to write a script that declares all your formats, Linked Data Views and storages, to be able to reproduce the configuration after any failures. ---+++Related * [[VirtTipsAndTricksGuide][Virtuoso Tips and Tricks Collection]] * [[http://docs.openlinksw.com/virtuoso/rdfsparql.html][SPARQL]]
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