Re: unorthodox use of PG for a customer
От | Adrian Klaver |
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Тема | Re: unorthodox use of PG for a customer |
Дата | |
Msg-id | b70eb7aa-ece9-a8a1-37da-01c7c55e9ed7@aklaver.com обсуждение исходный текст |
Ответ на | Re: unorthodox use of PG for a customer (David Gauthier <davegauthierpg@gmail.com>) |
Список | pgsql-general |
On 08/24/2018 12:07 PM, David Gauthier wrote: > I tried to convince him of the wisdom of one central DB. I'll try again. > > >>So are the 58 database(stores) on the workstation going to be working > with data independent to each or is the data shared/synced between > instances? > > No, 58 workstations, each with its own DB. There's a concept of a > "workarea" (really a dir with a lot of stuff in it) where the script > runs. He wants to tie all the runs for any one workarea together and is > stuck on the idea that there should be a separate DB per workarea. I > told him you could just stick all the data in the same table just with a > "workarea" column to distinguish between the workareas. He likes the > idea of a separate DB per workarea. He just doesn't gt it. Then a SQLite db per work area and as part of the batch rsync db file to remote server, do work on external server, rsync back to work area. > > >>I'm no expert, but I've dozens of PostgreSQL databases running mostly > without manual maintenance for years. > > Ya, I've sort of had the same experience with PG DBs. Like the > everready bunny, they just keep on running. But these workstations are > pretty volatile as they keep overloading them and crash them. Of course > any DB running would die too and have to be restarted/recovered. So the > place for the DB is really elsewhere, on an external server that > wouldn't be subject to this volatility and crashing. I told him about > transactions and how you could prevent partial writing of data sets. > > So far, I'm not hearing of anything that looks like a solution given the > constraints he's put on this. Don't get me wrong, he's a very smart and > sharp software engineer. Very smart. But for some reason, he doesn't > like the client/server DB model which would work so nicely here. I'm > just trying to make sure I didn't miss some sort of solution, PG or not, > that would work here. > > Thanks for your interest and input everyone ! > > > > > On Fri, Aug 24, 2018 at 2:39 PM Edson Carlos Ericksson Richter > <richter@simkorp.com.br <mailto:richter@simkorp.com.br>> wrote: > > Em 24/08/2018 15:18, David Gauthier escreveu: > > Hi Everyone: > > > > I'm going to throw this internal customer request out for ideas, > even > > though I think it's a bit crazy. I'm on the brink of telling him > it's > > impractical and/or inadvisable. But maybe someone has a solution. > > > > He's writing a script/program that runs on a workstation and > needs to > > write data to a DB. This process also sends work to a batch > system on > > a server farm external to the workstation that will create multiple, > > parallel jobs/processes that also have to write to the DB as > well. The > > workstation may have many of these jobs running at the same > time. And > > there are 58 workstation which all have/use locally mounted disks > for > > this work. > > > > At first blush, this is easy. Just create a DB on a server and have > > all those clients work with it. But he's also adamant about having > > the DB on the same server(s) that ran the script AND on the locally > > mounted disk. He said he doesn't want the overhead, dependencies > and > > worries of anything like an external DB with a DBA, etc... . He also > > wants this to be fast. > > My first thought was SQLite. Apparently, they now have some sort of > > multiple, concurrent write ability. But there's no way those batch > > jobs on remote machines are going to be able to get at the locally > > mounted disk on the workstation. So I dismissed that idea. Then I > > thought about having 58 PG installs, one per workstation, each > serving > > all the jobs pertaining to that workstation. That could work. > But 58 > > DB instances ? If he didn't like the ideal of one DBA, 58 can't be > > good. Still, the DB would be on the workstation which seems to be > > what he wants. > > I can't think of anything better. Does anyone have any ideas? > > > > Thanks in Advance ! > > > > I'm no expert, but I've dozens of PostgreSQL databases running mostly > without manual maintenance for years, just do the backups, and you > are fine. > In any way, if you need any kind of maintenance, you can program it in > your app (even backup, restore and vacuum) - it is easy to throw > administrative commands thru the available interfaces. > And if the database get out of access, no matter if it is > centralized or > remote: you will need someone phisically there to fix it. > AFAIK, you don't even PostgreSQL installer - you can run it embed if > you > wish. > > Just my2c, > > Edson > > -- Adrian Klaver adrian.klaver@aklaver.com
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