Analyze

Analyze collects statistics about the contents of tables in the database, and stores the results in the system table pg_statistic. Subsequently, the query planner uses these statistics to help determine the most efficient execution plans for queries.

Analyze Database
Just simply right-click the database and select Maintain Database -> Analyze Database....

Analyze Table
Just simply right-click the table and select Maintain Tables -> Analyze Tables....

Parameters
Verbose Enables display of progress messages. (Default enabled in Navicat)

Outputs
When Verbose is specified, Analyze emits progress messages to indicate which table is currently being processed. Various statistics about the tables are printed as well.

Related topics:
Vacuum
Reindex