Pagination with Sequelize using limit takes 4 times longer to load. How can I optimize? - sql

Question

I am currently using Sequelize with Node.js and I wanted to incorporate pagination. The code works, however, Sequelize takes 4 times more time to load than what it used to. 13 seconds is not acceptable as a loading time for each page. I tried both findAll and findAndCountAll, but as soon as I add the limit to the options, it becomes really slow. Here is the query used in node.js:
return req.models.BookingGroup.findAndCountAll({
attributes: group_attrs,
where: group_where,
include: [
{
model: req.models.Booking,
attributes: book_attrs,
where: booking_where,
include: [
{
model: req.models.Guest,
attributes: [
'id',
'firstname',
'lastname',
'email',
],
},
],
}
],
offset,
limit
})
.then(({count, rows}) => {
res.send(200, {count, groups: rows})
return {count, groups: rows}
})
.catch(err => console.log("##error ", err))
Am I doing something wrong? It only returns 70 entries, I don't think it should take this long. I haven't found anything online, and I don't know if it is a problem with Sequelize but any help is appreciated !

Answer 1

I came across a performance issue when using findandcountall.
In my case, Sequelize formed a lengthy JOIN statement in findandcountall (You can check this with passing the option logging: console.log).
However, instead of using findAndCountAll, I used .count() to get the number and .findAll() to get the results. This actually turned out to be much faster than using the findAndCountAll().
const count = await req.models.BookingGroup.count({
where, include, distinct: true, ...
});
const bookingGroup = await req.models.BookingGroup.findAll({
where, include, attributes, limit, offset, ...
});
res.send({ bookingGroup: [], count });