Johannes Neubauer's Technical Blog

There exists a phenomenon in JPQL/SQL that isn’t quite intuitive in the first place, but gets clearer after you have understand how it works. A normal JOIN in a JPQL query is evaluated as an INNER JOIN. That means, that a row will not be selected, if the right hand side of the JOIN is NULL. This may sometimes lead to unexpected results…
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Again (see ring buffer), this is a post, which shows an approach I will not need, since my backup script will change encore un fois.

I began to write a backup script using hard links and rsync in order to have incremental backups inspired by incremental backups with rsync. But after a little bit of hassle with bash script a friend gave me the hint that rsnapshot is out there and this little perl tool is either enlightened by Mike Rubels approach. So I will have to change my backup strategy from ‘push’ to ‘pull’ and make some other subtle changes, but don’t have to bother with ring buffers and backup rotation, because rsnapshot has already worked that out for me.
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This post is a little bit infantile, since it does present a really, really simple thing, but I wrote the shell code yesterday for a backup script and it seems as I will not need it. So I write it down here so either I do not forget it (who knows when it will come in handy?) or perhaps someone else says: “Hey my script could be much easier using this”. In the next days I will post the code that replaces the code shown in this post, so stay tuned.
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