Migrating Oracle materialized views to PostgreSQL

The key question

A materialized view stores a derived result. The central question is how fresh that result must be and which readers need access while it is being refreshed.

What to inventory

• Capture definitions, source objects and dependent reports.
• Record refresh methods, schedules and existing runtimes.
• Document indexes and consistency requirements.

Design the target deliberately

PostgreSQL supports materialized views and explicit refresh. Oracle-specific refresh and optimization mechanisms should not be assumed to map directly. Evaluate full refresh, pre-aggregated tables or another data-supply pattern using realistic data volume.

A concrete validation step

A daily approved report can use a different mechanism from an operational dashboard. Define maximum acceptable data age and refresh window first; the technical design follows from that.

Evidence required before sign-off

• Measure refresh with realistic change volume.
• Test queries while refresh is running.
• Reconcile results with underlying data.
• Make stale data visible when refresh fails.