Why does an empty database take megabytes of space?

Posted by Joonas Pulakka on Stack Overflow See other posts from Stack Overflow or by Joonas Pulakka
Published on 2010-03-12T07:43:48Z Indexed on 2010/03/12 7:47 UTC
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When experimenting with (embedded) Apache Derby DB, I noticed that a fresh database, with no tables in it, takes about 1.7 MB of disk space. It's quite a bit more than my common wisdom would expect.

Why is that? Are there significant differences in this between various database engines?

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