Can there be any problems deleting records when iterating over them in Tarantool?

Question

Capture this:

for _, t in box.space.session.index.user:pairs({uid}) do
    local session_id = t[F.session.id]
    box.space.session:delete({session_id})
end

Can there be any performance or correctness problems?

Tarantool 1.9

user_9141779 · Answer

It's totally fine. However, be advised of the following:

if you don't use transactions, you may or may not walk over records that are being inserted while you're iterating over space.
adding transactions would boost performance
but, transactions that consist of more than several thousand records may freeze tarantool for too long, so final decision depends on your typical load