Our Query currently has space for a 32-bit queryId, but that seems
reasonably likely to result in collisions:
https://en.wikipedia.org/wiki/Birthday_problem#Probability_table
If you have as many as 50,000 queries, there's a 25% probability of
having at least one collision; that doesn't seem particularly
unrealistic. Obviously, normalization reduces the number of distinct
queries a lot, but if queries are dynamically generated you might
still have quite a few of them.
How about widening the value to uint64?
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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