Обсуждение: Fast Table Replication / Mirroring
Hi,
I saw some replication projects but think this might be an overkill for
my intentions.
I have two databases, Primary / Secondary where the Secondary is
readyonly for
users. I need to mirror tables when changes occur on that table. That
may happen a few times a day.
Tables are in the area of few 100k records.
A) Is there an easy way to copy the data from Primary to Secondary
Can this be triggered by updates on the primary table ?
B) Is there a fast way to check if table A on Primary and Secondary
server are in Sync?
Not number of records but contents.
Any advise would be appreciated.
Alex
see contrib/dbmirror ... triggered by updates on the primary. Don't know if it would work for you ... not sure about
thesecond part (see the differences). It uses a table it creates called "Pending" to store transactions.
Greg W.
-----Original Message-----
From: Alex [mailto:alex@meerkatsoft.com]
Sent: Thu 8/28/2003 8:49 PM
To: pgsql-general@postgresql.org
Cc:
Subject: [GENERAL] Fast Table Replication / Mirroring
Hi,
I saw some replication projects but think this might be an overkill for
my intentions.
I have two databases, Primary / Secondary where the Secondary is
readyonly for
users. I need to mirror tables when changes occur on that table. That
may happen a few times a day.
Tables are in the area of few 100k records.
A) Is there an easy way to copy the data from Primary to Secondary
Can this be triggered by updates on the primary table ?
B) Is there a fast way to check if table A on Primary and Secondary
server are in Sync?
Not number of records but contents.
Any advise would be appreciated.
Alex
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Marc, could you point me to some information on eRServer ? Ist this a commercial product ? Thanks A Marc G. Fournier wrote: >On Fri, 29 Aug 2003, Alex wrote: > > > >>Hi, >>I saw some replication projects but think this might be an overkill for >>my intentions. >> >>I have two databases, Primary / Secondary where the Secondary is >>readyonly for >>users. I need to mirror tables when changes occur on that table. That >>may happen a few times a day. >>Tables are in the area of few 100k records. >> >>A) Is there an easy way to copy the data from Primary to Secondary >> Can this be triggered by updates on the primary table ? >> >> > >We're actually using eRServer inhouse for this, to keep "local copies" of >on specific table in sync between several servers ... > > > > >
On Fri, 29 Aug 2003, Alex wrote: > Hi, > I saw some replication projects but think this might be an overkill for > my intentions. > > I have two databases, Primary / Secondary where the Secondary is > readyonly for > users. I need to mirror tables when changes occur on that table. That > may happen a few times a day. > Tables are in the area of few 100k records. > > A) Is there an easy way to copy the data from Primary to Secondary > Can this be triggered by updates on the primary table ? We're actually using eRServer inhouse for this, to keep "local copies" of on specific table in sync between several servers ...
Yes and no ... we just released an OSS version of it on gborg, based on
v1.2 ...
http://gborg.postgresql.org/project/erserver/projdisplay.php
On Fri, 29 Aug 2003, Alex wrote:
> Marc,
> could you point me to some information on eRServer ? Ist this a
> commercial product ?
>
> Thanks
> A
>
> Marc G. Fournier wrote:
>
> >On Fri, 29 Aug 2003, Alex wrote:
> >
> >
> >
> >>Hi,
> >>I saw some replication projects but think this might be an overkill for
> >>my intentions.
> >>
> >>I have two databases, Primary / Secondary where the Secondary is
> >>readyonly for
> >>users. I need to mirror tables when changes occur on that table. That
> >>may happen a few times a day.
> >>Tables are in the area of few 100k records.
> >>
> >>A) Is there an easy way to copy the data from Primary to Secondary
> >> Can this be triggered by updates on the primary table ?
> >>
> >>
> >
> >We're actually using eRServer inhouse for this, to keep "local copies" of
> >on specific table in sync between several servers ...
> >
> >
> >
> >
> >
>
>
>
On Thu, 2003-08-28 at 22:49, Alex wrote: > Hi, > I saw some replication projects but think this might be an overkill for > my intentions. > > I have two databases, Primary / Secondary where the Secondary is > readyonly for > users. I need to mirror tables when changes occur on that table. That > may happen a few times a day. > Tables are in the area of few 100k records. > > A) Is there an easy way to copy the data from Primary to Secondary > Can this be triggered by updates on the primary table ? > > B) Is there a fast way to check if table A on Primary and Secondary > server are in Sync? > Not number of records but contents. If changes only happens a couple of times a day, and the table only have a few hundred thousand rows in them, why not dump the tables every few hours and load them into the Secondary DB? -- ----------------------------------------------------------------- Ron Johnson, Jr. ron.l.johnson@cox.net Jefferson, LA USA "they love our milk and honey, but preach about another way of living" Merle Haggard, "The Fighting Side Of Me"
I need to reflect the changes onto the secondary machine and would like to initiate and run the process from the primary machine. The secondary machine may be in use at the time (read only though) and I cannot truncate or drop tables there (also because I have foreign key constraints on the table itself). Ron Johnson wrote: >On Thu, 2003-08-28 at 22:49, Alex wrote: > > >>Hi, >>I saw some replication projects but think this might be an overkill for >>my intentions. >> >>I have two databases, Primary / Secondary where the Secondary is >>readyonly for >>users. I need to mirror tables when changes occur on that table. That >>may happen a few times a day. >>Tables are in the area of few 100k records. >> >>A) Is there an easy way to copy the data from Primary to Secondary >> Can this be triggered by updates on the primary table ? >> >>B) Is there a fast way to check if table A on Primary and Secondary >>server are in Sync? >> Not number of records but contents. >> >> > >If changes only happens a couple of times a day, and the table only >have a few hundred thousand rows in them, why not dump the tables >every few hours and load them into the Secondary DB? > > >