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I previously asked this in StackOverflow, But I couldn't find a solution, so I thought I'd share my problem here too. I have an old system that uses Informix for data storage, and I'm working on migrating such system, which includes migrating the data to a MySQL server.

What I need to do is allow some old subsystems to query some data already stored in MySQL (corresponding to subsystems in production), and combine it with their Informix tables.

So I find myself in the need to combine MySQL and Informix tables (joins in particular), and I have no idea how to proceed. I tried querying MySQL, and building a temporary table in Informix with the recovered data, but there are more than 4000 rows, and the insert queries are too slow.

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