relation "public.***" contains more than "max_fsm_pages" pages with useful free space
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有时我们在操作大表的时候会发生relation “public.*” contains more than “max_fsm_pages” pages with useful free space的错误，其实这个错误和max_fsm_pages参数有关。
max_fsm_pages必须大于 16 * max_fsm_relations，且max_fsm_pages最小必须为100,看出当max_fsm_pages不足时，表中的无效元组还是删除掉了的
max_fsm_pages在greenplum中的默认值是200000，greenplum中每张数据页的大小是32K，200000*32K约为6.1G，而且这还是每个实例上的数值
在GPDB中，vacuum会提示fsm不足如果你是10节点，出错了就说明你操作的表数据已经超过6.1*10=61G.其实GPDB的max_fsm_pages的默认值比postgresql大很多，没有必要再继续提高此参数。
解决方案：找个业务不太繁忙的时间vacuum full该表就行了。
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