The SYSCS_UTIL.SYSCS_EMPTY_STATEMENT_CACHE stored procedure removes as many compiled statements (plans) as possible from the database-wide statement cache. The procedure does not remove statements related to currently executing queries or to activations that are about to be garbage collected, so the cache is not guaranteed to be completely empty after a call to this procedure.
If authentication and SQL authorization are both enabled, only the database owner has execute privileges on this procedure by default. See "Enabling user authentication" and "Setting the SQL standard authorization mode" in the Derby Developer's Guide for more information. The database owner can grant access to other users.
CallableStatement cs = conn.prepareCall ("CALL SYSCS_UTIL.SYSCS_EMPTY_STATEMENT_CACHE()"); cs.execute(); cs.close();