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Lightning Memory-Mapped Database Manager (LMDB) 1.0

http://www.lmdb.tech/doc/
27•radiator•1h ago

Comments

radiator•1h ago
New features in LMDB 1.0 include:

- support for incremental backup

- support for page-level checksums and encryption

- support for DB on raw block devices

- support for 2-phase commit

- support for page sizes up to 64KB

plus other minor additions to the API.

paveworld•55m ago
HTTP ?? Com’on man
radiator•50m ago
it is just a link to documentation
Retr0id•46m ago
TLS certs are freeeeee
radiator•30m ago
Judging from this very release, where he implemented support for page-level checksums and encryption for LMBD, I assume the author knows a thing or two about encryption. He probably then deemed it unnecessary for this specific website.
Retr0id•8m ago
Cryptography engineers are not excluded from being lazy sysadmins.
radiator•3m ago
What do you mean "lazy"? I thought you said TLS certs were free. Do you mean they cost something? Time, for example?

Anyway, of course in case you feel the website is a risk, you should refrain from using it.

hmry•31m ago
Do people have good experiences with LMDB, in terms of reliability? I've never used it in production, but I've read through the code and design documents for a database implementation class.

I remember some strange code (such as pushing return values 4k above the stack, with a comment like "this works as long as the caller doesn't use more than 4k of stack space before accessing the return value"), and the author also shared some unconventional opinions about undefined behavior (like "Compilers are deterministic, if I know what platform I'm compiling to then no behavior is undefined. And if compiler authors disagree, they are morons.")

But presumably it's thoroughly tested, so those aren't problems in practice? Would be really interested to hear from people who've actually used it. I've mainly stuck to SQLite instead.

radiator•24m ago
It has been used successfully as the backend for OpenLDAP and Monero, at least.
thombles•16m ago
Be cautious if you're using large databases on iOS. At least until fairly recently, iOS doesn't page dirty mmaped pages back to disk and after enough churn the app will OOM.
hilariously•20m ago
Maybe rephrase this part - "It is read-only by default as this provides total immunity to corruption. Using read-write mode offers much higher write performance, but adds the possibility for stray application writes thru pointers to silently corrupt the database."

I generally do think read-write mode would offer higher write performance than read only as well :)

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