A Google search of sqlite multiple processes provides a variety of (not Perl-specific) cautions and suggestions about using multiple processes with SQLite. I cordially suggest that you review these. SQLite's architecture does indeed support concurrency, but since there is no server, it is a mixed bag. Yours is not a Perl-specific issue by any means.

In reply to Re: DBD::SqLite issue while accessing DB from multiple processes by Anonymous Monk
in thread DBD::SqLite issue while accessing DB from multiple processes by zuverlassig

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