About getting frequent itemsets in ODM

Question

Hi everyone,
I have got a transactional table transactions of the form (trans_id NUMBER, item VARCHAR2(56)). Each transaction has many rows, each one representing an item. I want to mine this view in order to find the frequent itemsets. I am on Oracle 11g rel 2. I tried two things:
1. the procedure dbms_frequent_itemsets.fi_transactional. I created a type fi_varchar_nt56 and then issued the query
SELECT CAST(itemset AS fi_varchar_nt56) itemset,
       support,
       LENGTH,
       total_tranx
       FROM TABLE(dbms_frequent_itemset.fi_transactional(CURSOR(SELECT trans_id, item FROM transactions),
                                                         0.6,
                                                         2,
                                                         5,
                                                         NULL,
                                                         null))and I get the following error:
ORA-00600: code d'erreur interne, arguments : [qmxtrGetRealOPn], [], [], [], [], [], [], [], [], [], [], []
00600. 00000 -  "internal error code, arguments: [%s], [%s], [%s], [%s], [%s], [%s], [%s], [%s]"
*Cause:    This is the generic internal error number for Oracle program
           exceptions.     This indicates that a process has encountered an
           exceptional condition.
*Action:   Report as a bug - the first argument is the internal error numberSo, I'd like to know how to fix this problem or bug.
2. I installed Oracle Data Miner (version 11.1.0.3.0) and created a Association Rule Activity. I get the results for different Support and Confidence Tresholds, but the results are expressed as rules. I would like to know if it is possible to get the frequent itemsets as an intermediate step in Oracle Data Miner.
Thanks in advance.
Doulkifli.

Answer 1

Hi,
Using the, yet to be released ODMr 11.2, you can generate the sql for extracting out itemsets from a AR model.
See generated sql below.
Thanks, Mark
WITH /* START OF SQL FOR NODE: Model Details */
"N$10003" as (select "MODEL_SCHEMA",
"MODEL_NAME",
"ID",
"SUPPORT",
"NUMBER_OF_ITEMS",
"ATTRIBUTE_NAME",
"ATTRIBUTE_SUBNAME",
"ATTRIBUTE_STR_VALUE",
"ATTRIBUTE_NUM_VALUE" from (SELECT 'DMUSER' as "MODEL_SCHEMA",
'ASSOC_AP_1_11' as "MODEL_NAME",
itemset_id as "ID",
support as "SUPPORT",
number_of_items as "NUMBER_OF_ITEMS",
item.attribute_name as "ATTRIBUTE_NAME",
item.attribute_subname as "ATTRIBUTE_SUBNAME",
item.attribute_num_value as "ATTRIBUTE_STR_VALUE",
item.attribute_str_value as "ATTRIBUTE_NUM_VALUE"
FROM TABLE(dbms_data_mining.get_frequent_itemsets('"DMUSER"."ASSOC_AP_1_11"', NULL, NULL)) t,
TABLE(t.items) item
/* END OF SQL FOR NODE: Model Details */
select * from "N$10003"