<transcript><audio_84>version of 100 is no longer needed because I know all the transactions that are in the system no one needs a value older than 100 and I can basically go and start to vacuum those out and remove that now remember these version chains could be long they could be spread</transcript><transcript><audio_85>across different pages and things like that so this vacuuming process can be pretty expensive and it's making extensive changes to that entire database uh which you know obviously is not just one file one table but all the tables could have had this type of</transcript><transcript><audio_86>version management that is needed one optimization you could do in Stu saying I'm always going to scan all the file files from start to the end from the first page to the last page every time some update happens to a page you'll keep track of a simple metadata which</transcript><transcript><audio_87>might have one bit per page that marks the page as dirty so you you've got a billion pages in your database and only thousand of them were touched the vacuum process doesn't need to go and read the billion pages to determine have you been touched right is there a version tail in</transcript> version of 100 is no longer needed because I know all the transactions that are in the system no one needs a value older than 100 and I can basically go and start to vacuum those out and remove that now remember these version chains could be long they could be spread across different pages and things like that so this vacuuming process can be pretty expensive and it's making extensive changes to that entire database uh which you know obviously is not just one file one table but all the tables could have had this type of version management that is needed one optimization you could do in Stu saying I'm always going to scan all the file files from start to the end from the first page to the last page every time some update happens to a page you'll keep track of a simple metadata which might have one bit per page that marks the page as dirty so you you've got a billion pages in your database and only thousand of them were touched the vacuum process doesn't need to go and read the billion pages to determine have you been touched right is there a version tail in
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