https://bugs.exim.org/show_bug.cgi?id=3084
--- Comment #3 from Jeremy Harris <jgh146exb@???> ---
Macros are evaluated at config load time, which means at every process exec:
every command-line-source message, the daemon, every delivery-routing action
and
every nonlocal transport. The config is loaded in full every time.
Exim runs a pool of DB connections, though because it also traverses several
processes
during the handling of a message, and in large part any given process only
handles one
message, the benefit of the pool is limited. Many DB accesses during the input
ACL
processing for a connection will benefit most. Additionally,
character-identical
lookups will hit in a local cache. New DB connections are made lazily, not
associated with use of the main-config option (mysql_zervers or similar) versus
a
spec local to the lookup in question. The connection is then held open in the
pool
(until overflow or a full tidyup is needed).
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