375  18198 
"Noons" <wi*******@yaho o.com.au> wrote in message
news:42******** *************** @per-qv1-newsreader-01.iinet.net.au ... Madison Pruet apparently said,on my timestamp of 4/08/2005 6:07 AM:
So, what happens if a trigger in that table changes ANOTHER
table that is not being replicated? Do the OTHER table's
changes get replicated as well? Note: you asked for "ALL trigger
activity".
At a minimun the replication solution should be able to either prevent
triggers from firing on the target if it is populated by a replication
apply, with the assumption (and policing) that all of the tables
associated with original transaction is replicated as part of that transaction.
I was not talking about triggers on the target nor were you. It's very
clear above. Don't change the subject.
Fantastic. I couldn't care less about the "or" bits to "deal with this
problem". First of all, you didn't even understand the problem.
the original table". That's : *ALL* OF THE TRIGGER ACTIVITY PERFORMED
ON THE *ORIGINAL TABLE*. That is a much more complex requirement.
I want to know how YOU address it with specific NATIVE Informix
replication (or any other product's for that matter).
Fair enough --- on the IDS informix server, to do this with say 5 instances
by issueing the two commands
cdr define template noons --database=noons --master=node1 --all
cdr realize template noons --syncdatasource= node1 node2 node3 node4 node5
This would set up an update anywhere of everything in the noons database
using the five servers.
Madison Pruet wrote: At a minimun the replication solution should be able to either prevent
triggers from firing on the target if it is populated by a replication
apply, with the assumption (and policing) that all of the tables associated
with original transaction is replicated as part of that transaction.
Yes, there is a function that should be called in an updateable MV
target table trigger DBMS_MVIEW.I_AM _A_REFRESH. It returns FALSE if
trigger is fired by local changes, and TRUE if trigger is fired by
replication.
"Mark Malakanov" <ma*****@rogers .com> wrote in message
news:xL******** ************@ro gers.com...
Madison Pruet wrote: At a minimun the replication solution should be able to either prevent
triggers from firing on the target if it is populated by a replication
apply, with the assumption (and policing) that all of the tables
associated with original transaction is replicated as part of that transaction.
Yes, there is a function that should be called in an updateable MV
target table trigger DBMS_MVIEW.I_AM _A_REFRESH. It returns FALSE if
trigger is fired by local changes, and TRUE if trigger is fired by
replication.
"Mark Malakanov" <ma*****@rogers .com> wrote in message
news:xL******** ************@ro gers.com...
Madison Pruet wrote: At a minimun the replication solution should be able to either prevent
triggers from firing on the target if it is populated by a replication
apply, with the assumption (and policing) that all of the tables
associated with original transaction is replicated as part of that transaction.
Yes, there is a function that should be called in an updateable MV
target table trigger DBMS_MVIEW.I_AM _A_REFRESH. It returns FALSE if
trigger is fired by local changes, and TRUE if trigger is fired by
replication.
That's a good feature. But is there a way to prevent the trigger from
firing without having to make the trigger aware of the fact that replication
exists? Otherwise, wouldn't it be difficult to use replication with third
party applications?
Madison Pruet wrote: "Mark Malakanov" <ma*****@rogers .com> wrote in message
news:xL******** ************@ro gers.com...
Madison Pruet wrote:
At a minimun the replication solution should be able to either prevent
triggers from firing on the target if it is populated by a replication
apply, with the assumption (and policing) that all of the tables
associated
with original transaction is replicated as part of that transaction.
Yes, there is a function that should be called in an updateable MV
target table trigger DBMS_MVIEW.I_AM _A_REFRESH. It returns FALSE if
trigger is fired by local changes, and TRUE if trigger is fired by
replication .
That's a good feature. But is there a way to prevent the trigger from
firing without having to make the trigger aware of the fact that replication
exists? Otherwise, wouldn't it be difficult to use replication with third
party applications?
I'm afraid it would be difficult. Triggers should be modified.
If you have third-party app that was not designed for replication, you
could use Advanced Replication, that works via Streams and AQ and is
practically transparent to the app. But it is lincensed separately.:(
AR is very powerful thing, mainly because it allows to resolve data
collisions using many standard and custom methods, and can work with a
close to real time latency.
So depending on the scenario, you can use Standard R with full or fast
refreshes, groups, for one-direction replication. I doubt that you will
run the same app on the replica. Usually it is some kind of reporting DB.
If you need two(several) identical DBs with identical apps, that
actively work by-directionally, you have to go with AR, and to think
about collision resolutions.
but... what was an initial question? :)
On Thu, 04 Aug 2005 05:36:54 +1000, Noons <wi*******@yaho o.com.au>
wrote: Madison Pruet apparently said,on my timestamp of 4/08/2005 5:32 AM:
I am sure IBM Global Services are just as happy to look after an Oracle
database as a DB2 database as an abacus if they can earn their hourly
fee for doing so... (LOL)!!
and place heaps of their hordes on the job.
27 dbas in a single project, I counted last time.
As if ANY of them was a dba...
Noons --- I'd be very careful about talking of the number of DBA's required
to run a database system if I were you. I can quote some fairly impressive
system/dba ratios which are in place for the IBM Informix server.
Me too. I can even tell you in which project IBMGSA
placed the 27 dbas.
Oracle DBAs or DB2 DBAs?? 8-)
JWC
On Wed, 03 Aug 2005 20:06:31 +1000, Noons <wi*******@yaho o.com.au>
wrote: John Carlson apparently said,on my timestamp of 3/08/2005 11:25 AM:
I use ER under 9.4; it works quite well. Relatively low overhead . .
. . and I'm looking forward to 10.00.
That's great. Someone please give the man the
blue plastic bucket.
And your point would be . . . . ? I'm saying, in my case with my
systems, it works. Not as perfect as I'd like, but it works. Rows
get updated / inserted on source; rows get replicated to reporting
server. Nothing fancy . . . .
No blue buckets needed . . . . I don't work for IBM. 8-)
If you don't want to keep Informix in the conversation, then please
drop comp.databases. informix from your post list. Give a hoot, don't
pollute.
As soon as everyone else, including you, does the same
to all the other cross replies. Who the heck do you think
you are to tell me how and where to post? Get lost.
Correct the error / comment in direct proportion to the broadcast.
Your quote of . . . .
Madison:
I've long ago stopped believing in fairies, godmothers
and other garden variety gnomes.
Spare me the "mine is longer than yours", I don't give
a rat's arse what Informix does, under or not IBM.
Tah?
.. . . was cross-posted to all three, thus the reply / correction /
comment gets cross-posted as well.. If you don't really wish to talk
(intelligently or otherwise) about Informix, then why bother posting
to c.d.i? You do have the right to post; other Oracle DBAs post here
too. But when it gets ridiculous, we also have the right to either
correct or ignore.
'Nuff said from here . . . back to the fireworks . . . 8-)
JWC
"Mark Malakanov" <ma*****@rogers .com> wrote in message
news:Na******** ************@ro gers.com... Madison Pruet wrote: "Mark Malakanov" <ma*****@rogers .com> wrote in message
news:xL******** ************@ro gers.com...
Madison Pruet wrote:
At a minimun the replication solution should be able to either prevent
triggers from firing on the target if it is populated by a replication
apply, with the assumption (and policing) that all of the tables
associated
with original transaction is replicated as part of that transaction.
Yes, there is a function that should be called in an updateable MV
target table trigger DBMS_MVIEW.I_AM _A_REFRESH. It returns FALSE if
trigger is fired by local changes, and TRUE if trigger is fired by
replication .
That's a good feature. But is there a way to prevent the trigger from
firing without having to make the trigger aware of the fact that
replication exists? Otherwise, wouldn't it be difficult to use replication with
third party applications?
I'm afraid it would be difficult. Triggers should be modified.
Mark - you are cross-posting to comp.databases. informix.
Believe me, I'm fully aware of how difficult this is, and also how important
it is to make replication seemless for user and third-party applications.
IBM Informix Enterprise Replication supports the ability to dynamically fire
or not fire the triggers based on wheither the update is performed by a user
thread or by the replication apply. That means no modification of the
trigger body is required to support replication, even though the tables have
triggers defined. Informix Enterprise Replication also has the option to
permit selective firing of the triggers. On some tables you might fire
them; on others not.
Since by default, triggers are not fired on the targets, we are able to
fairly easily configure the system to replicate all of the tables within the
database without having to modify the triggers that are supporting the
application. Or I can again fairly easily define a subset of tables within
the database that I want to replicate as a group. Basically replicate all of
the related tables affected by the firing of the triggers and not firing any
triggers on the target.
Noons wrote: Frank van Bortel apparently said,on my timestamp of 4/08/2005 5:18 AM:
Thanks for clarifying that, Montpellier it was.
Well, Montpellier <-> Nice is 275 km.
Both on the Cote d'Azur. Close enough for me.
This is Europe you're talking about Frank,
there are entire countries in there smaller
than that! :)
Smaller than 275 km ???
Ok , a couple are smaller than 275 square kilometers.
--
Anton Versteeg
IBM Netherlands
Serge Rielau wrote: Call it RAC, GRID, autonomous computing, queuing, advanced XML,
information integration. I think the commercial database vendors will
stay ahead of the open source crowd for the foreseeable future.
Comparing marketshare between the faction in this environment is another
can of worms.
I DO think you're underestimating both growth rate and capabilities of
the OS databases. I honestly think those databases will gain a lot of
marketshare in a very short time. We're using DB2 atm for our ASP
service, but it's mainly because of the reputation and the lack of
practice information concerning OS databases. We're not willing to take
the risk of using an OS database that *might* not be up to the task.
But a database like postgres might aswell be able to do the things we
need. It *has* the capabilities we need; SQL, backup/restore, stored
procedures, ODBC connectivity, schema's, tablespaces, ACID, and so on...
The are a few things that are unclear: TPS and stability. The biggest
things lacking for OS databases are not very technical, these are
reputation (DB2/Oracle/Informix/Sybase etc. are proven technology and
built a certain reputation over the years) and support (still
notoriously little support for OS databases).
I see a lot of young companies around me, and they all consider OS
databases first. Only if an OS database doesn't fit, then and only then
will they consider an expensive commercial database.
Sure, the commercial databases have a solid base of customers, but I
doubt the growth of customers is increasing or even stable.
But one thing we can all agree on is MSSQL. I cannot place that thing
anywhere. Too expensive to compete with OS, and too ..erm.. arcane to
compete with commercial databases. But one behemoth of marketing :P
-R- This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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