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Hello,
I was working with the following Aster Express query in Studio:
SELECT DISTINCT path, count(*) cnt
FROM nPath (
ON bank_web_clicks
PARTITION BY customer_id, session_id
ORDER BY datestamp
MODE(NONOVERLAPPING)
PATTERN ('PAGE+.BME')
SYMBOLS
(
TRUE AS PAGE,

Hi to the performance experts among you.
 
We have a pretty large key table, with at least one VARCHAR(30) column storing the real world source key, here SOURCE_KEY_COLUMN1, and one bigint column storing the surrogate key (PI), here EVENT_ID.
 
CREATE MULTISET TABLE KEY_EVENT [...]
     (
      EVENT_ID BIGINT,