Hi,
there is no general limit. As Tamino is available on different hardware / OS platforms there always is the strategy of buying bigger iron if you run into performance problems. There are right now productive databases running somewhere beyond double-digit GigaByte storage space on inexpensive hardware.
As with all databases, when things get big, everything depends on parametrization of the database kernel and at that foremost on “just the right” indexes being employed. You know, you can slow down about any system with a query that requires the kernel to sift thru obscene amounts of data. As long as you care for your data structure, Tamino will hum along quite nicely.
Best regards, Andreas
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