Respect your server's SQL cache
	l Optimised Access Plan etc. is cached within the server n keyed by the exact original SQL string used l Without placeholders, SQL string varies each time n so cached one is not reused n and time is wasted creating a new access plan n the new statement and access plan are added to cache n so the cache fills and other statements get pushed out l Compare do("insert … $id");             with do("insert … ?", $id);
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