Bonjour,

Est ce que quelqu'un comprend à quoi correspond les niveaux 3 et 4 du paramètre optimizer_dynamic_sampling. Je n'arrive pas à interpréter ce qui est mis dans la doc:
Level 3: Apply dynamic sampling to all tables that meet Level 2 criteria, plus all
tables for which standard selectivity estimation used a guess for some predicate
that is a potential dynamic sampling predicate. The number of blocks sampled
is the default number of dynamic sampling blocks.
Level 4: Apply dynamic sampling to all tables that meet Level 3 criteria, plus all
tables that have single-table predicates that reference 2 or more columns. The
number of blocks sampled is the default number of dynamic sampling blocks.