Table authentication: stores consumer key/secret pairs for authenticated requests.
Table sp_configurations: stores Sphinx Configurations.
Table sp_configuration_index: stores the connections between configurations and indexes.
Table sp_configuration_searchd: stores the connections between configurations and searchd entities.
Table sp_configuration_source: stores the connections between configurations and datasource entities.
Table constants: various constants (ENUM replacement).
Table sp_indexes: stores indexes.
Table sp_index_option: stores the connections between options and indexes.
Table sp_options: stores available options.
Table sp_searchd: stores searchd entities.
Table sp_searchd_option: stores the connections between searchd entities and options.
Table sp_source_option: stores the connections between datasource entities and options.
Table sp_sources: stores datasource entities.