dsqed program executes slow SQL queries, that delete data from SQL table. The queries are created by the other modules of David system. It allows modules to work all the time without breaks, that can execute slow SQL queries. And dsqed program executes all prepared queries one by one.

If the program doesn't have any queries to execute, it optymalizes the SQL tables, that queries deleted more then a definite number of records. It is 50000 records by default.