SQLite Is a Library of Congress Recommended Storage Format
sqlite.org208 points by whatisabcdefgh 10 hours ago
208 points by whatisabcdefgh 10 hours ago
I'm always inspired by SQLite. Overall I like it, but if you're not doing writes it's really overkill.
So I made a format that will never surpass SQLite, except that it's extremely lighter and faster and works on zstd compressed files. It has really small indexes and can contain binaries or text just like SQLite.
The wasm part that decompresses and reads and searches the databases is only 38kb (uncompressed (maybe 16kb gzipped)). Compare that to SQLite's 1.2mb of wasm and glue code it's 3% the size but searching and loading is much faster. My program isn't really column based and isn't suitable for managing spreadsheets, but it's great for dictionaries and file archives of images and audio.
I ported the jbig2 decoder as a 17kb wasm module, so I can load monochrome scans that are 8kb per page and still legible.
https://github.com/tnelsond/peakslab
SQLite is very well engineered, PeakSlab is very simple.
Perhaps a dumb question, but how do you get data into it if you’re not doing writes
something something XKCD competing standards something something
Believe me, I tried sticking to SQLite or aard2 or stardict, they just were fundamentally inadequate with no good pwa cross platform tooling.
Does this remain true now that SQLite has a WASM build?
Yes, because originally when I started PeakSlab it used the SQLite wasm build.
I have always loved SQLite.
I have also heard that some firms ban its use.
Why?
Because it makes it SO easy to set up a database for your app that you end up with a super critical component of your application that looks exactly like a file. A file that can have any extension. And that file can be copied around to other servers. Even if there is PII in that file. Multiply this times the number of applications in your firm and you can see how this could get a little nuts.
DevOps and DBA teams would prefer that the database be a big, heavy iron thing that is very obviously a database server. And when you connect to it, that's also very obvious etc etc.
I still love SQLite though.
The question is, do the same firms ban Excel? Excel spreadsheets often end up as shadow databases in unlikely places.
The sane thing would be to ban Excel and promote SQLite. Excel is often used for tabulated text (issue tracking) not calculations. Perfect use case for a relational db
Excel has sheets for tables, columns and rows, primary keys (UNIQUE), foreign key references etc if you squint.
It doesn't require you use all of that properly, but it's there.
Excel is made for calculations. But if you make it hard to make a DB, people will abuse Excel as a DB.
I mean, it might have been at first, but Microsoft figured out that the majority of users for lists without formulas in 1993 and they've strategized around that. IMHO, the biggest concession to this was when they added Power Query to core Excel in 2016.
They generally cannot. But they do banish Access.
Now that is different.
Access gets used for a shared DB and that is quite easy to corrupt. It is much more cost effective to have that in a proper central database (I supse SQLLite is better here as well)
Do companies ban text files? Text files are used to store data.
Do companies ban data centers? It's crazy to send PII to other computers on the line.
There are interesting uses for sqlite, like this one: https://sqlite.org/sqlar.html
> DevOps and DBA teams
Ah so two teams nobody should listen to.
At least would take it with a grain of salt when the DBA wants you to depend more on the DBA.
Same with devops tbh.
"Hey everyone, we need to chose the option that involves us the most and provides us the most job security"
Well... eventually the company learns the lesson the hard way, either because a site goes down or gets 0wned. Then everyone will cry about "how this could happen", and the ops people will tell you in response "we warned you that this would happen, here's the receipts, now GTFO".
I went from thinking “SQLite is a toy product, not reliable for real data" to "lets use SQLite for almost everything"
SQLite is very good if you can fit into the single writer, multiple readers pattern; you'll never lose data if you use the correct settings, which takes a minute of Google search to figure out.
Today, most of my apps are simply go binary + SQLite + systemd service file.
I've yet to lose data. Performance is great and plenty for most apps
The single writer is less of an issue in practice than it's made out to be. Modern nvme drives are incredible and it's trivial to get 5k writes per second in an optimized WAL setup. Way more than most apps could ever dream.
And even then, I've used a batch writer pattern to get 180k writes per second on a commodity vps.
all* of that + sharding -> https://sqlite.org/lang_attach.html
ex: main.db + fts.db. reading and writing to main.db is always available; updating the fts index can be done without blocking the main database — it only needs to read, the reads can be chunked, and delayed. fts.db keeps the index + a cursor table — an id or last change ts
could also use a shard to handle tables for metrics, or simply move old data out of main.db
* some examples:
conn = sqlite3.connect("data.db")
conn.execute("PRAGMA journal_mode=WAL") # concurrent reads (see above)
conn.execute("PRAGMA synchronous=NORMAL") # fsync at checkpoint, not every commit
conn.execute("PRAGMA cache_size=-62500") # ~61 MB page cache (negative = KB)
conn.execute("PRAGMA temp_store=MEMORY") # temp tables and indexes in RAM
conn.execute("PRAGMA busy_timeout=5000") # wait 5s on lock instead of failingI usually try to explain it like this: “Single writer” is rarely a real problem, because a writer is not slow. It writes exclusively, but very quickly.
"Batch writer pattern" is a good idea to get rid of expensive commits.
> As of this writing (2018-05-29) ...
So this news is nearly <del>six</del> EIGHT years old. But I didn't happen to know about it until now, so that's not a complaint at all; rather, this is a thank-you for posting it.
(Thanks for the correction. Brief brain malfunction in the math department there).
2026 recommended storage formats: https://www.loc.gov/preservation/resources/rfs/data.html
For public-sector data preservation, it may be one of the best options.
The specification is publicly available
- It is widely adopted - It is likely to remain readable in the future - It has little dependency on specific operating systems or services - It carries low patent risk
From the perspective of long-term continuity, avoiding dependence on any particular company or service is extremely important.
Archivists also love formats close to native. SQLite lets the relational relationships be present in a way that csv cannot.
That's certainly true. The ability to define table relationships is a major difference from CSV.
I'm surprised they included proprietary format that's de facto standard in profession or supported by multiple tools (.xls, .xlsx) in preferred section [1]. I wonder if "well-known enough" is as good as "open" from preservation standpoint.
[1] https://www.loc.gov/preservation/resources/rfs/data.html
Especially when Office 365 shows that not even Microsoft is capable of making software which can display Office files anymore... if you have a Word file which was created or has ever been modified by the Word application, working with it through Office 365 in a browser is such a pain. I've literally had images which are impossible to delete or move in the web version, and they will absolutely render in the wrong place.
You can unzip the xlsx and read the xml inside. It’s not the worst format by far.
I love SQLite and thanks for sharing it but there should be a "(2018)" at the end in the title:
> As of this writing (2018-05-29) the only other recommended storage formats for datasets are XML, JSON, and CSV.
FYI, they added a lot more formats to the list after that.
Preferred
1. Platform-independent, character-based formats are preferred over native or binary formats as long as data is complete, and retains full detail and precision. Preferred formats include well-developed, widely adopted, de facto marketplace standards, e.g.
a. Formats using well known schemas with public validation tool available
b. Line-oriented, e.g. TSV, CSV, fixed-width
c. Platform-independent open formats, e.g. .db, .db3, .sqlite, .sqlite3
2. Any proprietary format that is a de facto standard for a profession or supported by multiple tools (e.g. Excel .xls or .xlsx, Shapefile)
3. Character Encoding, in descending order of preference:
a. UTF-8, UTF-16 (with BOM),
b. US-ASCII or ISO 8859-1
c. Other named encoding
---
Acceptable
For data (in order of preference):
1. Non-proprietary, publicly documented formats endorsed as standards by a professional community or government agency, e.g. CDF, HDF
2. Text-based data formats with available schema
For aggregation or transfer:
1. ZIP, RAR, tar, 7z with no encryption, password or other protection mechanisms.
.7z being there just discredits the entire process. The underlying compression algorithm is a free-hand one and can be anything[0], or contain bugs and exploits[1]. Personally I use only zstd with .7z which is 'non-standard' by the official (Russian) release.
[0]: https://7-zip.org/7z.html
[1]: CVE-2025-0411
On a recent project I have needed to use exFAT. exFAT is terrible for a number of reasons, but in my case the thing I had to deal with was the lack of journaling, which had the possibility to corrupt files if there were a power interruption or something.
I initially was writing a series of files and doing some quasi-append-only things with new files and compacting the old one to sort of reinvent journaling. What I did more or less worked but it was very ad hoc and bad and was probably hiding a lot of bugs I would eventually have to fix later.
And then I remembered SQLite. I realized that ACID was probably safe enough for my needs, and then all the hard parts I was reinventing were probably faster and less likely to break if I used something thoroughly audited and tested, so I reworked everything I was doing to SQLite and it worked fine.
I wish exFAT would die in a fire and a journaling filesystem would replace it as the "one filesystem you can use everywhere", but until it does I'm grateful SQLite exists.
The problem with it is you didn't solve your biggest actual problem, you just haven't had a problem bite you in the ass yet so you think your problem is solved.
I am not sure the problem is actually fully solvable. I think SQLite helps at least a little.
> I wish exFAT would die in a fire and a journaling filesystem would replace it as the "one filesystem you can use everywhere"
Where exactly is everywhere? Win32? All of Linux? BSDs? MacOS? IOS? ...
Everywhere exFAT is supported now. Windows, Mac, Linux, FreeBSD would be fine.
Something MacOS and Windows support natively would be a good start, it could grow from there.
It's so funny, because I was JUST telling a colleague of mine - another librarian - this exact fact about sqlite!
I get annoyed at all the other DBs that require their own heavy duty server process when for 90% of my projects there is only one client, my app server. Is there a DB that combines sqlite's embedded simplicity with higher concurrent write throughput?
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个人使用，我是真的超喜欢SQLite
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