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Tracing VPD Predicates

Even though a number of articles and blog posts have already been written on this topic (e.g. on Pete Finnigan’s site I found references dating back from 2003), from time to time I’m still asked “How to trace predicates generated by VPD?”. Hence, here’s yet another blog post about this topic…
Let’s setup the scene before [...]

Does the Query Optimizer Cost PX Distribution Methods?

The short answer to this question is “yes”, it does. Unfortunately, the distribution costs are not externalized through the execution plans and, as a result, this limitation (yes, it is really a limitation in the current implementation, not a bug) confuses everyone that carefully look at the information provided in an execution plan of a [...]

Does CREATE INDEX Gather Global Statistics?

You can add the COMPUTE STATISTICS clause to the CREATE INDEX statement. It instructs the SQL statement to gather and store index statistics in the data dictionary, while creating the index. This is useful because the overhead associated with the gathering of statistics while executing this SQL statement is negligible. In Oracle9i, the gathering of [...]