You can use the

Analyze Target Table

option to extract sample rows from the table, analyze the samples, and save the column statistics. Amazon Redshift then updates the query planner with the statistical metadata. The query planner uses the statistical metadata to build and choose optimal plans to improve the efficiency of queries.

You can run the

Analyze Target Table

option after you load data to an existing table by using the

Copy

command. If you load data to a new table, the

Copy

command performs an analysis by default.