Обсуждение: Re: mirroring databases
Is rserv suitable for what you want?
I believe that provides single master async replication (not 100% sure as I havn't used it).
- Stuart
> -----Original Message-----
> From: April L [mailto:april@i-netco.com]
> Sent: 17 July 2002 18:30
> To: pgsql-novice@postgresql.org
> Subject: Re: [NOVICE] mirroring databases
>
>
> Thank you for that suggestion.
>
> What is the general method for replacing changed records and
> adding new
> records, between remote locations? Assume a one-way sync, ie a mirror.
> Records will only be added or changed at one location.
>
> Thank you,
>
> - April
>
>
> At 11:52 AM 7/17/2002 -0500, D. Duccini wrote:
> >
> >put a trigger on the table so that it updates a
> date/timestamp on updates,
> >like a "lastModified" column
> >
> >
> >On Wed, 17 Jul 2002, April L wrote:
> >
> >> Has anyone done, or know of utilities for, remote location
> "near real time
> >> mirroring" of postgres databases?
> >>
> >> An update every 15 minutes or so would work for this
> purpose. However, the
> >> total number of records is in the millions, and the number
> of changed or
> >> new records per day could be thousands.
> >>
> >> To avoid transferring all records, I'm imagining a flag column that
> >> indicates if a new or changed record has been transferred
> to the mirror
> yet.
> >>
> >> Any suggestions...?
> >>
> >> - April
> >>
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Here is the filesystem method using rsync. I haven't used this method myself. http://www.taygeta.com/ha-postgresql.html ----- Original Message ----- From: "D. Duccini" <duccini@backpack.com> Date: Thu, 18 Jul 2002 15:03:14 -0500 (CDT) To: April L <april@i-netco.com> Subject: Re: [NOVICE] mirroring databases > > > What is the general method for replacing changed records and adding new > > records, between remote locations? Assume a one-way sync, ie a mirror. > > Records will only be added or changed at one location. > > make a 'diff' kind of file based on the changed information -- you can > either send out the changes to a file to be processed remotely by a piece > of software, or you can create a dump kind of file for direct import > > of course you could also look at doing a file-level replication using > something like rsync > > ----------------------------------------------------------------------------- > david@backpack.com BackPack Software, Inc. www.backpack.com > +1 651.645.7550 voice "Life is an Adventure. > +1 651.645.9798 fax Don't forget your BackPack!" > ----------------------------------------------------------------------------- > > > ---------------------------(end of broadcast)--------------------------- > TIP 3: if posting/reading through Usenet, please send an appropriate > subscribe-nomail command to majordomo@postgresql.org so that your > message can get through to the mailing list cleanly > > -- _______________________________________________ Get your free email from http://www.graffiti.net Powered by Outblaze
Interesting reading about rsync and heartbeat. Now I understand the suggestion that I could dump the changed and new records to a file, send them to the remote location perhaps with rsync, then "import" them. Luckily this is the novice list, so I can ask things like: could I just do a select into (or whatever means "append new and replace existing") statement at the remote location that accessed the changed/new records at the other location? would that be a lot slower or have other disadvantages? Thank you, - April At 10:09 AM 7/19/2002 +0800, Derek Barrett wrote: >Here is the filesystem method using rsync. > >I haven't used this method myself. > >http://www.taygeta.com/ha-postgresql.html >----- Original Message ----- >From: "D. Duccini" <duccini@backpack.com> >Date: Thu, 18 Jul 2002 15:03:14 -0500 (CDT) >To: April L <april@i-netco.com> >Subject: Re: [NOVICE] mirroring databases > > >> >> > What is the general method for replacing changed records and adding new >> > records, between remote locations? Assume a one-way sync, ie a mirror. >> > Records will only be added or changed at one location. >> >> make a 'diff' kind of file based on the changed information -- you can >> either send out the changes to a file to be processed remotely by a piece >> of software, or you can create a dump kind of file for direct import >> >> of course you could also look at doing a file-level replication using >> something like rsync >> >> ----------------------------------------------------------------------------- >> david@backpack.com BackPack Software, Inc. www.backpack.com >> +1 651.645.7550 voice "Life is an Adventure. >> +1 651.645.9798 fax Don't forget your BackPack!" >> ----------------------------------------------------------------------------- >> >> >> ---------------------------(end of broadcast)--------------------------- >> TIP 3: if posting/reading through Usenet, please send an appropriate >> subscribe-nomail command to majordomo@postgresql.org so that your >> message can get through to the mailing list cleanly >> >> > >-- >_______________________________________________ >Get your free email from http://www.graffiti.net > >Powered by Outblaze > >---------------------------(end of broadcast)--------------------------- >TIP 4: Don't 'kill -9' the postmaster > >