Re: postgresql vs sqlite for Cuirass (was Re: Hackathon: Mumi and Cuirass)

["Gábor Boskovits" <boskovits@gmail.com>]

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Hello,

Giovanni Biscuolo <g@xelera.eu> ezt írta (időpont: 2019. máj. 16., Cs,
16:23):

> Hello Björn,
>
> Björn Höfling <bjoern.hoefling@bjoernhoefling.de> writes:
>
> [...]
>
> >> 2) Cuirass
> >
> > On Guix days, we discussed the idea of using Postgresql as a backend.
>
> Please do you remember the rationale behind this idea?
>
>
This was just an idea to test if we can make the database scalability
problem we
currently have solved.


> What is the issue with using sqlite?
>

Currently the database response times on sqlite are not acceptable.
Any suggestions to overcome this would be appreciated.


> Why a client/server approach vs an embedded database?
>
> I don't have much experience with web applications backed by sqlite, but
> AFAIU sqlite is sometime "misunderstood"
>
> Some interesting arguments from sqlite developer:
> https://sqlite.org/whentouse.html#website
> --8<---------------cut here---------------start------------->8---
>
> Dynamic content uses about 200 SQL statements per webpage. This setup
> runs on a single VM that shares a physical server with 23 others and yet
> still keeps the load average below 0.1 most of the time.
>
> --8<---------------cut here---------------end--------------->8---
>
> https://sqlite.org/np1queryprob.html
> --8<---------------cut here---------------start------------->8---
>
> 200 SQL statements per webpage is excessive for client/server database
> engines like MySQL, PostgreSQL, or SQL Server.
>
> But with SQLite, 200 or more SQL statement per webpage is not a problem.
>
> SQLite can also do large and complex queries efficiently, just like
> client/server databases. But SQLite can do many smaller queries
> efficiently too. Application developers can use whichever technique
> works best for the task at hand.
>
> [...]
>
> N+1 Queries Are Not A Problem With SQLite
>
> --8<---------------cut here---------------end--------------->8---
>
> [...]
>
> Thanks! Gio'
>
> --
> Giovanni Biscuolo
>
> Xelera IT Infrastructures
>
Best regards,
g_bor

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