18c SQL*Plus "set linesize window" is a great idea, especially for sqlplus run in a terminal window such as Putty whose window size can be easily changed and sqlplus linesize automatically adapts to the window size. But this setting also automatically changes pagesize to the window height. Suppose your Putty is 40 lines in height, your query that sends more than one screen full of output will repeat the header every 40 lines. And you can't even set pagesize separately, unless you stop using "linesize window" altogether. A better design would be for "set linesize window" to only affect linesize (as the name suggests), or allow an optional setting after the word "window" e.g. "set linesize window pagesize 200", or "set linesize window noset pagesize".