![]() ![]() I haven't written back-end code in like 12 years now, the things that are happening there today blow my mind. (Which I'm not saying in a derogatory way. These are all very relevant for real-life workloads of super advanced cloud systems, I'm sure. changing crontabs for 1 minute ahead (which I don't think is a "cron idiom" - I've certainly never done i - but we all have our weird hacks), and how it has built-in jitter options and per-job environment settings and whatnot. Not that I have a problem with systemd, which I don't hate and I use extensively (both in my customers' products and on my machine because it's the default init system of the distro I use), but this thread illustrates a lot of why a lot of pre-systemd Linux users just don't dig it.Įvery time someone asks "why should I use systemd instead of cron" they get these (technically correct - the best kind of correct!) answers about how systemd timers allow you to attach jobs to cgroups, define dependencies, test unit files separately vs. In Germany, you're breaking the law if you're running a commercial site and are not clearly stating who you are, so maybe that's why alarms are ringing in my head when I don't see it. Neither makes me want to trust you with critical infrastructure (and here's where I'm irrational: seeing a company name and address is enough, unless there's some suspicion, I won't even dig into it to see whether the company or address actually exists).Īs I mentioned, it's not specific to you at all, a lot of SaaS companies do this, and I don't understand it. I wouldn't expect pictures, CVs etc, but a contact page that doesn't list a company/individual name and a street address triggers two feelings: a) scam or b) run from a bedroom. But for a company? If somebody wants to sue you, they will find out who you are in any case. A DDOS service would only provide an email address for obvious reasons. Typically, I associate "we don't tell you who we are" with grey/black stuff. Sure, you can dig around, find the termly-page and then at the end find some info, but that looks so scammy to me, while the rest of the page doesn't give me that vibe at all. The following table keeps track of which of the major managed Postgres services support pg_cron.It's not even about putting your face onto it, that's understandable. Computing rollups in an analytical dashboard.Example use casesĪrticles showing possible ways of using pg_cron: In addition, users are only able to see their own jobs in the cron.job table. pgpass file, which libpq will use when opening a connection.įor security, jobs are executed in the database in which the cron.schedule function is called with the same permissions as the current user. Alternatively, you can add the password to a. It may be necessary to enable trust authentication for connections coming from localhost in pg_hba.conf for the user running the cron job. Important: Internally, pg_cron uses libpq to open a new connection to the local database. ![]() Install on Red Hat, CentOS, Fedora, Amazon Linux with PostgreSQL 11:ĬREATE EXTENSION pg_cron - optionally, grant usage to regular users: Be aware that pg_cron always uses GMT! Installing pg_cron The code in pg_cron that handles parsing and scheduling comes directly from the cron source code by Paul Vixie, hence the same options are supported. ![]() │ │ │ │ │ Saturday, or use names 7 is also Sunday)Īn easy way to create a cron schedule is:. The schedule uses the standard cron syntax, in which * means “run every time period”, and a specific number means “but only at this time”: ┌───────────── min (0 - 59) If a second run is supposed to start before the first one finishes, then the second run is queued and started as soon as the first run completes. Pg_cron can run multiple jobs in parallel, but it runs at most one instance of a job at a time. schedule ( '0 10 * * *', 'VACUUM' ) schedule. schedule ( '30 3 * * 6', $$ DELETE FROM events WHERE event_time < now () - interval '1 week' $$ ) schedule. Delete old data on Saturday at 3:30am (GMT) ![]()
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