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The character set that the server uses as its default.
character_set server_default_charset {};
Set this value if you know the character set that your server is configured
to use by default, as an optimization. It affects how the connection tracks
its current character set (see any_connection::current_character_set):
connection_collation is set
to invalid_collation_id, after
connection establishment, the connection's character set is assumed
to be this one.
any_connection::async_reset_connection, the
connection's character set is assumed to be this one (resetting restores
the server's default).
Leave it value-initialized (the default) if you don't know the server's default character set, in which case the above operations leave the current character set unknown.
When you set this value, you are promising the library that your server is configured to use this character set as its default. This is not checked at runtime, and failing to fulfill this promise can lead to vulnerabilities. Use it only as an optimization if you know what you are doing.