hola Al,
salvando las distancias, puede que no esté de más que eches un vistazo a este link
Cita:
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The examples below are the results of months of efforts trying to perform a large financial analysis on a large database (> 4Gb) within reasonable timings. The real breakthrough came with the introduction of the RDB$DB_KEY. In addition to enormous speed increase, it minimized the need for indexing, thus making both development and implementation both safer and easier.
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http://web.archive.org/web/200901030...of_the_rdb.htm
http://web.archive.org/web/200901040...umentation.htm
Igual no tiene demasiado que ver con tu problema, pero te puede dar alguna pista.
Un saludo