Over high latency links this would be virtually unusable. Why not just download the entire database into memory over XHR on page load? SQLite databases of pure data usually aren’t over 10MB in size.
This particular demo page actually makes queries against an almost 700 MB large (fills one CD!) SQLite database. Because the amount of data read is almost negligible (few hundred kB), performance is limited by latency (as you say). However, high-latency links also tend to be slower, so downloading the entire database a-priori would almost always be much slower.
For example, on a 1 megabit/s link with 300 ms RTT, one example would take about 2 seconds for the data transfer itself while spending another 3 seconds or so on waiting. Downloading the entire file would take around an hour and a half.
For your 10 MB database, transferring it as a whole would take 80 seconds. Assuming this solution instead needs to read e.g. 250 kB (taking 2 seconds to transfer), it could still bounce around 250 times to the database before those 10 MB are fully downloaded. (This would be a really odd query, since it would only read on average two pages per read request)
Right but that is an artificially created demo by the author to justify the solution being presented (no offense). The question is how common are ~GB large SQLite databases in the real world relative to databases that are ~MB large?
In my experience SQLite databases of millions of rows of raw tabular data tend to compress very well into dozens of megabytes. Indeed SQLite is often touted as a file format for applications.
SQLite is most interesting not when the database is small, but when there are very few writes and all you do is reading. You can also look at https://datasette.io/ and see how SQLite is perfect for representing a lot of datasets and querying them
> you need it in client memory which can also be a dealbreaker
Most workstations have GBs of available memory. If not you can dump it in indexeddb as a raw data store.
I never disputed that it would be useful for some use cases. I only said it would be unusable with high latency links. If you have a low latency link and aren’t running very complex queries with lots of random seeks, then this should work fine for you.
This is the fundamental flaw of 80% thinking. The fact that SQLite continues to reach for more users is what has made it such a successful general-purpose tool.
Where has it been suggested that this is the best solution for "the average SQLite user", instead of a tool you can use if it fits your requirements? To take your 10MB number, the article starts by mentioning you can probably just download the entire thing if you aren't above that exact same number.
It's not anymore unusable over high latency links than most website. Also worth noting that the caching is very smart, so once things are downloaded it's very fast.
But most high latency links are very slow (so downloading large databases is a horrible experience) and (more importantly) are often priced by the size of downloads.
> It's not anymore unusable over high latency links than most website.
That’s false. Not all web applications suffer equally from high latency links. Depends on how reliant the web application is on independent requests. Making one request and receiving a single bulk download is much less bad than making many dependent requests on a high latency link.
That is hilariously wrong for a lot of use cases. I will find this very handy for some SQLite databases I have that are several GBs in size. I am looking right now at using this contribution.
It’s not hilariously wrong or wrong at all that over high latency links this would be virtually unusable.
It’s certainly possible that people are using SQLite databases with sizes on the order of gigabytes but in my experience those are the exception not the rule.
And the article starts by mentioning that you can download the entire file if it's not too large. And then goes on to present a solution for larger files. What more answer to "Why not just download the entire database" do you expect?
Given their widespread uses on phones, the overall average is likely very small. KBs even.
A more relevant question might be: what would the average size of SQLite databases for web type (or even this specific use case) applications. I don't know, but 10s or 100s of MBs might not be a bad guess.
However, would those 10s or 100s of MBs be something web sites would just like to share in their entirety to the client to query as they wish? At least many commercial services would prefer to keep most of the data secret and even gain insight from the access requests.
But for a more open or a hobbyist project where minimizing amounts of data transfer is less important than minimizing the amount of doing more work (server-side code), then this seems like a decent solution.
It is also worth reminding that this solution only practically works for read-only databases.
