There are quite a few very large databases using PostgreSQL. Whether or not they have thousands of tables and indexes, billions of rows, or handle billions of queries per day, statistics help us plan for the future. Let's apply the previous steps to an example database that actually exists:
- The database is currently 875 GB
- The database was 865 GB last week
- The database grows by 10 GB per week
- Thus, the database grows by 40 GB every four weeks
- Using the formula we discussed in step two of this recipe, the number become this: 875 * (1 + 40/875)^36 = 4374 GB
- Doubled, this is 8748 GB
Keep in mind that this estimation technique may grossly exaggerate the necessary space. If we take the existing 40 GB monthly growth rate, the ...
