Knowing when a table was last used
You need to use a user with appropriate privileges.
How to do it…
If you have set up a cron job to collect usage statistics, as described in the previous chapter, then it is relatively easy to find out the last date of change using a SQL query.
Other than this, there are two possibilities, neither of which give you reliable answers.
You can either look at the actual timestamps of the files that the data is stored in, or you can use the
xmax system columns to find out the latest transaction ID that changed the table data.
In this recipe, we will cover the first case and focus on the date information in the table&apos...