Re: Recursive query performance issue
| От | Pavel Stehule |
|---|---|
| Тема | Re: Recursive query performance issue |
| Дата | |
| Msg-id | CAFj8pRB5fmPqc4DZyWwJqkdMM8OhnZJBivxuf46hR5UYEQfi6Q@mail.gmail.com обсуждение исходный текст |
| Ответ на | Recursive query performance issue (Jamie Koceniak <jkoceniak@mediamath.com>) |
| Ответы |
Re: Recursive query performance issue
|
| Список | pgsql-performance |
Hi
2015-10-20 19:34 GMT+02:00 Jamie Koceniak <jkoceniak@mediamath.com>:
Version:
-----------------------------------------------------------------------------------------------
PostgreSQL 9.1.14 on x86_64-unknown-linux-gnu, compiled by gcc (Debian 4.7.2-5) 4.7.2, 64-bit
Query Plan
http://explain.depesz.com/s/4s37
Normally, this query takes around 200-300 ms to execute.
However when several queries are run concurrently, query performance drops to 30-60 seconds.
there can be few reasons:
1. locking - are you sure, so your queries don't wait on locks?
2. issues with cache stability - is there high IO load? You can try to increase effective_cache_size (or decrease if you have not enough memory)
Regards
Pavel
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