sp_purge_jobhistory

Removes the history records for a job.

Example

Purge job history records older than 30 days.

DECLARE @PurgeDate DATE
SET @PurgeDate = (SELECT CONVERT(DATE, (GETDATE()-30), 101) )
EXEC sp_purge_jobhistory   @oldest_date = @PurgeDate

Sources:

https://docs.microsoft.com/en-us/sql/relational-databases/system-stored-procedures/sp-purge-jobhistory-transact-sql?view=sql-server-2017