A database administrator needs to increase performance on a large dimension table.

Improving the performance of large dimension tables in a database is crucial for efficient data retrieval and processing.

Partitioning: This technique involves dividing a large table into smaller, more manageable pieces called partitions. Each partition can be accessed and maintained separately, which enhances query performance and simplifies data management. Partitioning allows the database to read only the relevant partitions during a query, reducing the amount of data processed and speeding up response times.

Sampling: This involves analyzing a subset of data rather than the entire dataset. While useful for statistical analysis, it doesn't improve the performance of queries on the full dataset.

Windowing: This refers to functions that perform calculations across a set of table rows related to the current row, such as moving averages. It's useful for analytical purposes but doesn't inherently improve table performance.

Sorting: Organizing data in a specific order can aid in readability and certain query operations but doesn't significantly impact performance on large tables unless combined with indexing.

Therefore, partitioning is the most effective method to enhance performance on large dimension tables.