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Is it faster to stream a picture/image from a file system or to stream it from a BLOB, from a MySQL database?
What I am acctually asking:
Will it be faster for PHP to read a picture from a table and output it
to a browser, or to stream it directly from a file system?
First of all: It will in most cases be faster to read it from the file system.
Everything starting with “First of all” needs either a “but” or an “additionally” – I’ll try to provide both:
Additionally you will make your other queries slower, by using buffer pages for BLOB data, that could otherwise be used for data or indices.
But if you scale up to a more-than-one-server architecture, you will need a shared file system, which is a minefield in its own right. This sometimes (in special use cases, not routinely), is the argument that swings the jury towards storing BLOBS