27. Vacuum Command in Delta Table

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Vacuum a Delta table (Delta Lake on Databricks)
Vaccum Removes the files no longer referenced by a Delta table(Clean up files associated with a table)
You can remove files no longer referenced by a Delta table and are older than the retention threshold by running the vacuum command on the table.
Vacuum is not triggered automatically.
The default retention threshold for the files is 7 days.
Vacuum deletes only data files, not log files.
Log files are deleted automatically and asynchronously after checkpoint operations.
The default retention period of log files is 30 days, configurable through the delta.logRetentionDuration property

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