Some Magento2 Customer's login takes too much time

Question

We have magento2 community edition 2.2.6

We are having issues with customer login for some users,

Their login takes too much time, and in database it goes in sleep queries which remains their for like 5-10 15 minutes Even if there are no past orders or anything, it takes forever to load and times out

this happens to some of the users, and we don't know what is cause of this issue, we tried to find from logs and slow query logs, but didn't find the issue,

can any body help in look in this to resolve?

Answer 1

Ok, We solved this issue

(First we thought it was due to some extension but we disabled all extensions we installed and it was behaving same)

This comes due to old entries in quote table

We are not sure but some old inactive marked quote item for specific users were causing this delay, perhaps some bug in magento or dont know,

but we removed those entries from quote table which have the customer's email (customer who were facing the timeout issue) and it got fixed,

So basically Old entries some how magento is not be able process or get hold on properly via some queries running on post login pages, causing this issue, we accidentally found the cause while running

Mysql Show Full process list again and again while it was timing out So we checked the entry in database and found it was having customer email as logged in user, so to check I deleted that, and Bingo it was solved,

If you guys have came across similar issue and if its not solved by this method but some other method, do share your solution here

Answer 2

We faced the same issue with (apparently) random customer accounts and @Govind's answer helped us out a lot.

What I've noticed is that you don't even need to remove the entry entirely from the database table, it's enough that you set the is_active flag to 0 for the customer's quote in the quote table.

We did not dig deeper into the issue, but obviously the error seems to be quote-related, so perhaps the customer had some products in the basket that are no longer available etc.

Thankfully for us - changing the is_active flag solved our issue for the problematic customers.

Answer 3

If you use another API call that take some time means all pages are taking time. For example your using P21 Integration on ur website, that api getting the response of timeout then all pages are slow.

Answer 4

yes indeed, using the below SQL

-- check locked

select customer_email from quote where is_active = 0;

-- unlock

UPDATE quote set is_active = 1 where is_active = 0;