Cache management in OBIEE allows saving requests and dashboards to cache for improved performance when accessed again. Cache can be purged through the presentation service using an SQL command, manually by selecting queries in the cache manager, or on a schedule. Scheduled purging is set up by creating SQL and log files and a batch file to run the SQL, then scheduling the batch file to run on a defined schedule. This purges the entire cache or caches for specific queries, tables, or databases.