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Comment by mcbits | Hacker News Reader

How many files are you talking about? That's the relevant variable, not the amount of data or whether it's text, tabular or relational data, images, audio, etc. E.g. you can copy a single 10 GB file to another drive faster than 1 million files totaling 1 GB, all due to filesystem overhead. If there's a filesystem where that's not true, I'm interested. :)

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> How many files are you talking about?

The numbers won't seem significant by today's standards. In the one case (stored by date), maybe 150 thousand files, each a few megabytes.

> you can copy a single 10 GB file to another drive faster than 1 million files totaling 1 GB

True, but I'll bet you can create (or read) a thousand files with a thousand records each faster than you can insert (or select) a million records into (or from) a SQLite table.

150,000 is solidly in the realm where SQLite tested faster than the filesystems in the link above, although their files were only a few kilobytes. It's almost certainly different (worse) for multi-megabyte files. But what I've been trying to convey is that the number of records in the SQLite table will be identical to the number of files. If you need to parse the file contents, you'd parse the BLOB just the same. The difference is in how you interact with the disk.

Is reading X-thousand files containing a thousand records each (or one thumbnail, or one HTML dump, or one JavaScript function, or whatever) faster than SELECTing exactly the same number of BLOBs containing exactly the same data? It's worth considering and testing once the number of files starts affecting performance or even just becomes a pain to deal with. If it turns out that storing many files is still a better fit for a particular application, that's cool too. Nothing is a panacea.

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