I am dealing with blobs up to - I estimate - about 100 kilo bytes in
size.
Storage engine: InnoDB
Frontend: PHP
Some questions:
* I've read somewhere that it's not good to update blobs, because it
leads to reallocation, thus fragmentation, thus bad performance. Is
that true? Any reference on this?
* Initially the blobs get constructed by appending data chunks. Each
chunk is up to 16 kilo bytes in size. Is it more efficient to use a
separate chunk table instead, for example with fields as below?
parent_id, position, chunk
Then, to get the entire blob, one would do something like:
SELECT GROUP_CONCAT(chunk ORDER BY position) FROM chunks WHERE
parent_id = 187
The result would be used in a PHP script.
* Is there any difference between the types of blobs, aside from the
size needed for meta data, which should be negligible.
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