You can estimate your query time as follows.
SELECT CURRENT TIMESTAMP FROM SYSIBM.SYSDUMMY1;
-- Your query here…
SELECT CURRENT TIMESTAMP FROM SYSIBM.SYSDUMMY1;
-- Alternatively, for many queries:
DROP TABLE cse532.querytime;
CREATE TABLE cse532.querytime(
queryID VARCHAR (8),
starttime TIMESTAMP,
endtime TIMESTAMP);
INSERT INTO cse532.querytime VALUES(
'Q1', current timestamp, null);
UPDATE cse532.querytime
SET endtime = current timestamp
WHERE queryID = 'Q1';
SELECT TIMESTAMPDIFF(1, endtime - starttime)
FROM cse532.querytime;