Where should a database server keep its data files?

Options

• ✓ Block storage (a local SSD or a network volume like EBS) Correct
• ✗ Object storage like S3
• ✗ A CDN
• ✗ The database's own logs only

Why

A database rewrites small pieces of its files in place with low latency, which block devices provide. Object storage stores whole objects over HTTP: great for files and backups, too slow and coarse for live database pages.

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