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Path: ...!news.nobody.at!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: Thomas Koenig <tkoenig@netcologne.de> Newsgroups: comp.arch Subject: Re: big, fast, etc, was is Vax addressing sane today Date: Fri, 13 Sep 2024 11:20:06 -0000 (UTC) Organization: A noiseless patient Spider Lines: 25 Message-ID: <vc1756$r3ge$1@dont-email.me> References: <vbd6b9$g147$1@dont-email.me> <2024Sep11.113204@mips.complang.tuwien.ac.at> <vbsh3q$3n09p$1@dont-email.me> <vbtqib$2sce$2@dont-email.me> <vbvhs3$2std$1@gal.iecc.com> <vc0pi6$oj8p$1@dont-email.me> Injection-Date: Fri, 13 Sep 2024 13:20:06 +0200 (CEST) Injection-Info: dont-email.me; posting-host="dbc7d0a15bd17a7710696a18532ada9c"; logging-data="888334"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1/3vJwKvrDuAOhGp35WP/drN0kVgKHJg5A=" User-Agent: slrn/1.0.3 (Linux) Cancel-Lock: sha1:1gkvPztEGDlU+aQ9s9RJOSQOsjU= Bytes: 1929 Terje Mathisen <terje.mathisen@tmsw.no> schrieb: > 10-15 years ago I talked to another speaker at a conference, he told me > that he was working on high-end open source LDAP software using _very_ > large memory DBs: Their system allowed one US cell phone company to keep > every SIM card (~100M) on a single system, while a similar-size > competitor had been forced to fall back on 17-way sharding (presumably > using a hash of the SIM id). Keeping databases in memory is definitely a thing now... see SAP HANA. Any architectural implications for this? Browsing through the SAP pages, it seems they used Intel's Optane persistent memory, but that is no longer manufactured (?). But having fast, persistent storage is definitely an advantage for databases. Large memory: Of course. On the ISA level... these databases run on x86, so that seems to be good enough. Anything else?