First of all, you're not creating new connections there, because you're using connect_cached, which will try to reuse an existing connection. Second, even though you might be getting separate Perl objects, your database driver may or may not understand how to handle a fork situation. This is mainly an issue within the database driver (DBD), which likely is written in C and thus needs to take special care when fork()-ing or using multiple threads.

So far, you haven't shown any code relevant to fork(), and you haven't told us the platform you're running on, nor have you told us which database/driver you're using. There may still be many more interesting problems lurking, for example if you're on Windows, where the fork system call is emulated through threads. But telling us these details would possibly cut short the chase, so don't spoil the fun.

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