本文介绍PostgreSQL表访问方法中缓存失效的实现：后端缓存表arena映射，若其他后端删除或截断表，旧内存不会释放。作者利用relcache失效消息注册回调，在表变更时移除缓存条目；但回调中不能立即解除映射，只能记录待处理句柄，待事务结束时再解除，以避免扫描中途使用失效映射。

Jacob Jackson at ByteofDev built something I can only describe as admirably irresponsible (and something I wish I had thought of first): claudegres, a “PostgreSQL” in which Claude is the entire...