when inserting bulk rows and using a function call as one of the column values i'm getting exactly the same values for every 10-11 rows from the function. the function is actually generating UUID values and returns unique results. If i replace the function call in the insert statement with the actual code of the function it never repeats.
So what i conclude from this is that oracle actually caches the result of the function and calls it only once for every 10-11 rows it's inserting. how can i change this behavior?
the function i'm calling i've taken from http://www.oracle-base.com/articles/9i/UUID9i.php :
create or replaceFUNCTION new_uuid RETURN VARCHAR2 AS l_seed BINARY_INTEGER; l_random_num NUMBER(5); l_date VARCHAR2(25); l_random VARCHAR2(4); l_ip_address VARCHAR2(12);BEGIN l_seed := TO_NUMBER(TO_CHAR(SYSDATE,'YYYYDDMMSS')); DBMS_RANDOM.initialize (val => l_seed); l_random_num := TRUNC(DBMS_RANDOM.value(low => 1, high => 65535)); DBMS_RANDOM.terminate; l_date := conversion_api.to_hex(TO_NUMBER(TO_CHAR(SYSTIMESTAMP,'FFSSMIHH24DDMMYYYY'))); l_random := RPAD(conversion_api.to_hex(l_random_num), 4, '0'); l_ip_address := conversion_api.to_hex(TO_NUMBER(REPLACE(NVL(SYS_CONTEXT('USERENV','IP_ADDRESS'), '123.123.123.123'), '.', ''))); RETURN SUBSTR(l_date, 1, 8) || '-' || SUBSTR(l_date, 9, 4) || '-' || SUBSTR(l_date, 13, 4) || '-' || RPAD(SUBSTR(l_date, 17), 4, '0') || '-' || RPAD(L_RANDOM || L_IP_ADDRESS, 12, '0');END;and here's the insert statement i'm using:
INSERT INTO My_TABLE(ID, NAME,)SELECT NEW_UUID(), NAMEFROM MY_TABLE2;COMMIT;the select inside this statement produces lots of repeating UUIDs. while this statement produces unique ones:
SELECT RPAD(RPAD(my_schema.conversion_api.to_hex(TRUNC(DBMS_RANDOM.VALUE( 1, 65535))), 4, '0') || my_schema.conversion_api.to_hex(TO_NUMBER(REPLACE(NVL(SYS_CONTEXT('USERENV','IP_ADDRESS'), '123.123.123.123'), '.', ''))), 12, '0') sssFROM my_schema.MY_TABLE
