Aside from these (most of which have reasonably sane defaults with RDS / Aurora), the biggest thing you can do to help the existing RAM you have is to stop making stupid indexing choices.<p>You probably don’t need (or want) an index on every column.<p>You shouldn’t index a UUIDv4 column if you can ever help it (and by extension, you shouldn’t use them as a PK).<p>Finally, you almost certainly need to REINDEX what you have periodically. I’ve seen indices shrink by 400%, giving back GB of RAM. You want a quick win for speed with zero cost? Gain back enough RAM to have your entire working set cached.