作者
digoal
日期
2020-03-24
标签
PostgreSQL , badquery , badplan
背景
https://github.com/trustly/pg_badplan
A PostgreSQL extension for logging queries where the expected/actual rows ratio exceeds a defined value
What is it?
pg_badplan is an PostgreSQL extension that logs when the planners row estimate vs actual is over a specified ratio.
This is useful when you want to find queries where the planner might be doing a bad plan becase the statistics is bad.
It works by installing execution start and end hooks that first enable row instrumentation and during end check the plans estimated vs executed actual rows. Since it enables instrumentation it will likely impose a performance penelty but how much we haven't measured.
PostgreSQL 许愿链接
您的愿望将传达给PG kernel hacker、数据库厂商等, 帮助提高数据库产品质量和功能, 说不定下一个PG版本就有您提出的功能点. 针对非常好的提议，奖励限量版PG文化衫、纪念品、贴纸、PG热门书籍等，奖品丰富，快来许愿。开不开森.
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PostgreSQL 解决方案集合
德哥 / digoal's github - 公益是一辈子的事.
