CDB Views and Query Optimizer Cardinality Estimations

Published: 18/01/2018
CDB Views and Query Optimizer Cardinality Estimations
Source: ANTOGNINI.CH

Today I faced a performance problem caused by a bad cardinality estimation involving a CDB view in a 12.1.0.2 multitenant environment. While solving the problem I did a number of observations that I try to summarize in this blog post. First of all, when checking the execution plan of a query already running for more […]

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