相关疑难解决方法(0)

我在加载 PostgreSQL 9.3.4 时遇到了一些与 StackOverflow 模式相关的数据的问题。我有一个查询比它应该花费的时间长大约 10 倍，因为它选择使用散列连接而不是带有索引的嵌套循环。例如，如果我在查询中选择 500 个用户，则使用散列连接而不是使用 post_tokenized 表上的 id 和类型索引：

explain 
select creation_epoch, user_screen_name, chunk from post_tokenized as tokenized_tbl
                    join posts as posts_tbl
                    on posts_tbl.id = tokenized_tbl.id
                    where type = 'tag'
                    and user_screen_name is not null
                    and owner_user_id in (select id from users where reputation > 100000 order by reputation asc limit 500)
                    and tokenized_tbl.id in (select id from posts where owner_user_id in (select id from users where reputation > 100000 order by reputation asc limit …