Re: waiting for client write

@Magnus

There is an EC2 tomcat server which communicates to postgresql. This is a
replica of our production server except that in this case the test database
is postgres RDS and our production is running oracle on EC2 instance.

On Wed, Jun 9, 2021 at 5:47 PM Ayub Khan <ayub(dot)hp(at)gmail(dot)com> wrote:

> attached is the screenshot of RDS performance insights for AWS and it
> shows high waiting client writes. The api performance is slow. I read that
> this might be due to IOPS on RDS. However we have 80k IOPS on this test
> RDS.
>
> Below is the query which is being load tested
>
> SELECT
>
> a.menu_item_id,
> a.menu_item_name,
> a.menu_item_category_id,
> b.menu_item_category_desc,
> c.menu_item_variant_id,
> c.menu_item_variant_type_id,
> c.price,
> c.size_id,
> c.parent_menu_item_variant_id,
> d.menu_item_variant_type_desc,
> e.size_desc,
> f.currency_code,
> a.image,
> a.mark_id,
> m.mark_name
>
> FROM .menu_item_category AS b, .menu_item_variant AS
> c,
> .menu_item_variant_type AS d, .item_size AS e,
> .restaurant AS f,
> .menu_item AS a
>
> LEFT OUTER JOIN .mark AS m
> ON (a.mark_id = m.mark_id)
>
> WHERE a.menu_item_category_id =
> b.menu_item_category_id AND a.menu_item_id = c.menu_item_id AND
> c.menu_item_variant_type_id =
> d.menu_item_variant_type_id AND d.is_hidden = 'false' AND
> c.size_id = e.size_id AND a.restaurant_id =
> f.restaurant_id AND f.restaurant_id = 1528 AND
> (a.menu_item_category_id = NULL OR NULL IS NULL)
>
> AND c.menu_item_variant_id = (SELECT
> min(menu_item_variant_id)
> FROM
> .menu_item_variant
> WHERE
> menu_item_id = a.menu_item_id AND deleted = 'N'
> LIMIT 1) AND
> a.active = 'Y'
> AND (CONCAT_WS('', ',', a.hidden_branch_ids,
> ',') NOT LIKE CONCAT_WS('', '%,4191,%') OR
> NULL IS NULL)
> AND .is_menu_item_available(a.menu_item_id, 'Y') = 'Y'
>
> ORDER BY a.row_order, menu_item_id;
>
> --Ayub
>

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