If you want to read about an option that doesn't suffer from fragmentation (no pedantic replies please), check out LSM Trees which are what RocksDB uses. Desig

If you want to read about an option that doesn't suffer from fragmentation (no pedantic replies please), check out LSM Trees which are what RocksDB uses. Designing Data-Intensive Applications has a VERY clear and understandable chapter about them. Once you've finished reading it, you'll have the tools to whip together a toy implementation for something like this.