DELIMITER $$
CREATE PROCEDURE trimTable()
BEGIN
 DECLARE ROWS INT;
 DECLARE rows_deleted INT;
 SET ROWS = 1;
 SET rows_deleted = 10000;
 WHILE ROWS > 0
 DO
    DELETE FROM db.tabA WHERE predicate_col < CURDATE() - INTERVAL 90 DAY ORDER BY `id` LIMIT 10000;
    SET ROWS = ROW_COUNT();
    SET rows_deleted = rows_deleted + ROW_COUNT();
    SELECT rows_deleted AS "Rows Deleted";
 END WHILE;
END $$
DELIMITER ;