AUTO_CLOSE determines if a given database is closed or not after a connection terminates. If enabled, subsequent connections to the given database will require the database to be reopened and relevant procedure caches to be rebuilt. Rationale: Because authentication of users for contained databases occurs within the database not at the server\instance level, the database must be opened every time to authenticate a user. The frequent opening/closing of the database consumes additional server resources and may contribute to a denial of service.
Execute the following T-SQL, replacing <database_name> with each database name found by the Audit Procedure: ALTER DATABASE <database_name> SET AUTO_CLOSE OFF; Default Value: By default, the database property AUTO_CLOSE is OFF which is equivalent to is_auto_close_on = 0.