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Built-in sources can fetch data directly from My SQL, Postgre SQL, MSSQL, ODBC compliant database (Oracle, etc) or a pipe in TSV or a custom XML format. to natively support other DBMSes) is designed to be as easy as possible.
RT indexes, as of 1.10-beta, can only be populated using Sphinx QL.
Sphinx is a full-text search engine, publicly distributed under GPL version 2. It was specially designed to integrate well with SQL databases storing the data, and to be easily accessed by scripting languages.
Technically, Sphinx is a standalone software package provides fast and relevant full-text search functionality to client applications.
The data to be indexed can generally come from very different sources: SQL databases, plain text files, HTML files, mailboxes, and so on.
RT indexes additionally allow for online full-text index updates. Data can be loaded into disk indexes using a so-called data source.Sphinx can be compiled either from source or installed using prebuilt packages.