shared_preload_libraries ，增加pg_stat_statements

create extension pg_stat_statements;

select pg_stat_reset();
select pg_stat_statements_reset();

select * from pg_stat_statements order by total_time desc limit 5;

select * from pg_stat_statements order by shared_blks_hit+shared_blks_read desc limit 5;

参考：https://help.aliyun.com/knowledge_detail/43562.html
https://www.cnblogs.com/hellojesson/p/10911034.html