Topic: 2012 NA
Subtopic: DB2 for z/OS
SQL is a declarative language - the user specifies the “what” . It is up to the DB2 Optimizer to analyze the access path choices and determine the “how”.
A lot has changed since the early days of DB2. The language has grown. The queries are more complex. The amount of data has grown exponentially and the service level expectations have become tighter. What was good then is simply not acceptable today.
In this session, we will provide a historical context for the challenges faced by query optimization and discuss why “perfect” may not be attainable and what the future of query optimization may look like.
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