forum_thread主题表频繁锁表，有什么好办法么？
forum_thread（myisam）表大概1.6G大小，频繁的被锁表，而且mysql的慢查询几乎都和这个表有关系，类似的慢查询记录：# Time: 2022-05-08T01:51:00.188791Z
# User@Host: ****@localhost Id: 880133
# Query_time: 3.783841Lock_time: 0.094868 Rows_sent: 1Rows_examined: 1816276
SET timestamp=1651974660;
SELECT t.tid, t.closed, t.author, t.authorid FROM forum_thread tWHEREt.fid IN('176','183','166','147','174','31','56','77','78','80','76','158','160','167','171','178','179','240','241','247','248','249','262','282','156','74','70','71','72','73','69','97','161','86','136','169','173','175','92','94','182','281','159','285','88','89','90','48','25','21')AND t.displayorder>='0' AND (0 OR t.subject LIKE '*****') ORDER BY tidDESC LIMIT 500;
之前尝试给dateline加了索引，情况有轻微的改善，看上面的记录应该都是和搜索有关系的，论坛已经限制仅仅能搜索主题，但就这样如果还因为搜索频繁锁表的话，总不能禁止了搜索功能……
请高手指点一下，万分感谢！！！！！！！！！！！！！！
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