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Is it better to read and list images directly from file system using simple php, or is it better to store image meta info and filename in the database and access the images by doing a mysql select. What are the pros and cons of both solutions.
Listing files on a file system is probably the easiest way to accomplish what you trying to do but it’s going to be very slow if you are trying to cycle through several thousand directories/files on a networked file system (NFS, CIFS, GlusterFS, etc).
Storing files in a database will create a much more overhead since you are now involving an external application to store information. You have to remember that every time you are using a database you are also using network I/O, authentication mechanism, query parser, etc. At the same time all of this overhead might provide for a faster response then using a networked file system.
To conclude – everything depends on amount of files you are working with and underlying infrastructure. Two major things to look out for are going to be disk I/O and network I/O.