In this recipe, we will be discussing how to estimate disk growth using the pgbench tool.
One of the best practices to predict the database disk storage capacity is by loading a set of sample data into the application's database, and simulating production kind of actions using pgbench over a long period. For a period of time (every 1 hour), let's collect the database size using
pg_database_size() or any native command, which returns the disk usage information. Once we get the periodic intervals for at least 24 hours, then we can find an average disk growth ratio by calculating the average of delta among each interval value.
Prepare the SQL script as follows, which simulates the live application behavior ...