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There are a few methods to minimize the number of joins in Oracle:

1. Use subqueries instead of joins: Instead of joining a table with another table, you can use a subquery to retrieve the data you need from the second table. For example, instead of joining the orders table with the customers table, you can use a subquery to retrieve the customer name for each order.

2. Use materialized views: Materialized views are precomputed views that store the result of a query. By using materialized views, you can avoid joining tables every time a query is executed.

3. Use denormalization: Denormalization involves adding redundant data to a table to avoid joins. For example, instead of joining the orders and customers tables, you can add the customer name to the orders table.

4. Use partitioning: Partitioning involves dividing a large table into smaller, more manageable pieces. By partitioning a table, you may be able to avoid joining it with other tables, as you can query each partition separately.