The function tries to tune up that table represented by <cTable>. In Caché space 'tuning a table' refers to the selectivity pattern of different fields based on the current data. It may take some time to finish. The main purpose of tuning a table is to optimize and speed-up the SQL queries. As far as CachéRDD is concerned it has no effect unless you start to use its SQL interface where it will matter most.

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