If you want to know files with very big increments
SELECT PART.TABLE_SCHEMA, PART.TABLE_NAME, NUMBER_ROWS, NUMBER_DELETED_ROWS,
CHAR(IFNULL(TO_CHAR(INITIAL_RECORDS),'*NOMAX'),10) AS "INIT_RECORDS",
INCREMENT_RECORDS, MAXIMUM_INCREMENTS, REUSE_DELETED_RECORDS
FROM QSYS2.SYSPARTITIONSTAT AS PART
INNER JOIN QSYS2.SYSFILES AS FILE
ON PART.TABLE_SCHEMA = FILE.SYSTEM_TABLE_SCHEMA AND PART.TABLE_NAME = FILE.TABLE_NAME
WHERE PART.TABLE_SCHEMA = 'LIBRARY_NAME'
AND INITIAL_RECORDS <> 0 AND (NUMBER_ROWS > INITIAL_RECORDS)
AND MAXIMUM_INCREMENTS < 5
ORDER BY NUMBER_ROWS DESC;