Join IIUG
 for   
 

Informix News
18 Nov 13 - ZDNet - Top 20 mobile skills in demand... Read
09 Sep 13 - telecompaper - Shaspa and Tatung have shown a new smart home platform at Ifa in Berlin. Powered by the IBM Informix software... Read
06 Sep 13 - IBM data magazine - Mission Accomplished - Miami, Florida will be the backdrop for the 2014 IIUG Informix Conference... Read
01 Feb 13 - IBM Data Magazine - Are your database backups safe? Lester Knutsen (IBM Champion) writes about database back up safety using "archecker"... Read
14 Nov 12 - IBM - IBM's Big Data For Smart Grid Goes Live In Texas... Read
3 Oct 12 - The Financial - IBM and TransWorks Collaborate to Help Louisiana-Pacific Corporation Achieve Supply Chain Efficiency... Read
28 Aug 12 - techCLOUD9 - Splunk kicks up a SaaS Storm... Read
10 Aug 12 - businessCLOUD9 - Is this the other half of Cloud monitoring?... Read
3 Aug 12 - IBM data management - Supercharging the data warehouse while keeping costs down IBM Informix Warehouse Accelerator (IWA) delivers superior performance for in-memory analytics processing... Read
2 Aug 12 - channelbiz - Oninit Group launches Pay Per Pulse cloud-based service... Read
28 May 12 - Bloor - David Norfolk on the recent Informix benchmark "pretty impressive results"... Read
23 May 12 - DBTA - Informix Genero: A Way to Modernize Informix 4GL Applications... Read
9 Apr 12 - Mastering Data Management - Upping the Informix Ante: Advanced Data Tools... Read
22 Mar 12 - developerWorks - Optimizing Informix database access... Read
14 Mar 12 - BernieSpang.com - International Informix User Group set to meet in San Diego... Read
1 Mar 12 - IBM Data Management - IIUG Heads West for 2012 - Get ready for sun and sand in San Diego... Read
1 Mar 12 - IBM Data Management - Running Informix on Solid-State Drives.Speed Up Database Access... Read
26 Feb 12 - BernieSpan.com - Better results, lower cost for a broad set of new IBM clients and partners... Read
24 Feb 12 - developerWorks - Informix Warehouse Accelerator: Continuous Acceleration during Data Refresh... Read
6 Feb 12 - PRLOG - Informix port delivers unlimited database scalability for popular SaaS application ... Read
2 Feb 12 - developerWorks - Loading data with the IBM Informix TimeSeries Plug-in for Data Studio... Read
1 Feb 12 - developerWorks - 100 Tech Tips, #47: Log-in to Fix Central... Read
13 Jan 12 - MC Press online - Informix Dynamic Server Entices New Users with Free Production Edition ... Read
11 Jan 12 - Computerworld - Ecologic Analytics and Landis+Gyr -- Suitors Decide to Tie the Knot... Read
9 Jan 12 - planetIDS.com - DNS impact on Informix / Impacto do DNS no Informix... Read
8 Sep 11 - TMCnet.com - IBM Offers Database Solution to Enable Smart Meter Data Capture... Read
1 Aug 11 - IBM Data Management Magazine - IIUG user view: Happy 10th anniversary to IBM and Informix... Read
8 Jul 11 - Database Trends and Applications - Managing Time Series Data with Informix... Read
31 May 11 - Smart Grid - The meter data management pitfall utilities are overlooking... Read
27 May 11 - IBM Data Management Magazine - IIUG user view: Big data, big time ( Series data, warehouse acceleration, and 4GLs )... Read
16 May 11 - Business Wire - HiT Software Announces DBMoto for Enterprise Integration, Adds Informix. Log-based Change Data Capture... Read
21 Mar 11 - Yahoo! Finance - IBM and Cable&Wireless Worldwide Announce UK Smart Energy Cloud... Read
14 Mar 11 - MarketWatch - Fuzzy Logix and IBM Unveil In-Database Analytics for IBM Informix... Read
11 Mar 11 - InvestorPlace - It's Time to Give IBM Props: How many tech stocks are up 53% since the dot-com boom?... Read
9 Mar 11 - DBTA - Database Administration and the Goal of Diminishing Downtime... Read
2 Feb 11 - DBTAs - Informix 11.7 Flexible Grid Provides a Different Way of Looking at Database Servers... Read
27 Jan 11 - exactsolutions - Exact to Add Informix Support to Database Replay, SQL Monitoring Solutions... Read
25 Jan 11 - PR Newswire - Bank of China in the UK Works With IBM to Become a Smarter, Greener Bank... Read
12 Oct 10 - Database Trends and Applications - Informix 11.7: The Beginning of the Next Decade of IBM Informix... Read
20 Sep 10 - planetIDS.com - ITG analyst paper: Cost/Benefit case for IBM Informix as compared to Microsoft SQL Server... Read
20 Jul 10 - IBM Announcements - IBM Informix Choice Edition V11.50 helps deploy low-cost scalable and reliable solutions for Apple Macintosh and Microsoft Windows... Read
20 Jul 10 - IBM Announcements - Software withdrawal: Elite Support for Informix Ultimate-C Edition... Read
24 May 10 - eWeek Europe - IBM Supplies Database Tech For EU Smart Grid... Read
23 May 10 - SiliconIndia - IBM's smart metering system allows wise use of energy... Read
21 May 10 - CNET - IBM to help people monitor energy use... Read
20 May 10 - ebiz - IBM Teams With Hildebrand To Bring Smart Metering To Homes Across Britain... Read
19 May 10 - The New Blog Times - Misurare il consumo energetico: DEHEMS è pronto... Read
19 May 10 - ZDNet - IBM software in your home? Pact enables five-city smart meter pilot in Europe... Read
17 March 10 - ZDNet (blog) David Morgenstern - TCO: New research finds Macs in the enterprise easier, cheaper to manage than... Read
17 March 2010 - Virtualization Review - ...key components of Big Blue's platform to the commercial cloud such as its WebSphere suite of application ser vers and its DB2 and Informix databases... Read
10 February 2010 - The Wall Street Journal - International Business Machines is expanding an initiative to win over students and professors on its products. How do they lure the college crowd?... Read


End of Support Dates

IIUG on Facebook IIUG on Twitter

[ View Thread ] [ Post Response ] [ Return to Index ] [ Read Prev Msg ] [ Read Next Msg ]

IDS Forum

RE: database replication setup help

Posted By: Justin Killen
Date: Thursday, 23 May 2013, at 2:43 p.m.

In Response To: Re: database replication setup help (Art Kagel)

Art,

You say "If the RSS or HDR secondary is writable, the writes are still happening on the primary" and then later "If the WAN goes down you could continue to process transactions locally". I'm confused by this - if all writes are happening on the primary, then how could I continue to process transaction locally?

I guess my big question here is if I should be using an RSS at Site1 or an HDR secondary. I was under the impression that if I was using an HDR secondary and the WAN link went down, then the HDR primary at HQ would not be able to process transactions (insert/update/delete) because it could not sync with the offline HDR secondary at Site1 - am I wrong on this?

-Justin

-----Original Message-----
From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of Art Kagel
Sent: Thursday, May 23, 2013 10:53 AM
To: ids@iiug.org
Subject: Re: database replication setup help [30329]

OK, here are some points:

- If the RSS or HDR secondary is writable, the writes are still

happening on the primary (passed through by the secondary) and then

propagate to the secondaries including the secondary the originated the

write. There is no danger of the secondary getting out-of-sync with the

primary and having local transactions that the primary doesn't know about.

If the WAN goes down, you could still use the local RSS secondary at Site1

as a read-only query server, but would have to get the WAN back up in order

to process updates locally again.

- If you make the secondary read-only, then you apps will have to be

aware of that and either update the primary using distributed queries (ie

access the table's using the primary's servername: insert into

mydatabase@primary:mytable ...) or they could keep two connections open

(assuming the host language supports multiple connections (ESQL/C, C++, all

4GL variants, and Java do) one locally on the secondary for reading and one

remoted directly to the primary for updating. The writable option is

actually preferrable.

- You could use ER. If the WAN goes down you could continue to process

transactions locally, but when the LAN comes back up then conflict

resolution rules would have to resolve any problems caused by rows updated

on multiple servers.

- HDR and RSS secondaries will remain in sync for schema changes because

all logical log records (which include all DDL commands) are propagated to

the secondaries and applied there replicating changes happening on the

primary. Only index builds are slightly different. They can be configured

such that the secondary just gets notice of a new index and has to build it

locally or such that the actual log records generated by the index build

are sent over to the secondary replicating the index page-by-page. Your

choice. Indexes built the first way, the default, will remain locked on

the primary until the secondaries complete their build (unless the

connection is down).

- Flexible Grid is just a new internal communication protocol that lets

you issue commands that are processed across all servers on a named grid.

Those servers can be ER participants or independent servers. Prior to

v12.10 this could only be used for ER commands and DDL. In 12.10 you can

also distribute queries across the grid and return data from multiple

servers with a single SELECT.

Art

Art S. Kagel
Advanced DataTools (www.advancedatatools.com)
Blog: http://informix-myview.blogspot.com/

Disclaimer: Please keep in mind that my own opinions are my own opinions
and do not reflect on my employer, Advanced DataTools, the IIUG, nor any
other organization with which I am associated either explicitly,
implicitly, or by inference. Neither do those opinions reflect those of
other individuals affiliated with any entity with which I am affiliated nor
those of the entities themselves.

On Thu, May 23, 2013 at 1:31 PM, Justin Killen <
jkillen@allamericanasphalt.com> wrote:

> Hi.
>
> For the last several years, we've been running an Informix database for our
> accounting and production systems. We have two primary locations, which for
> the purpose of this email I'll call HQ and Site1. Site1 is connected to HQ
> over a WAN link (T1, etc), but we are investigating possible options to
> change
> this to use Informix's replication (mainly to speed up access). HQ and
> Site1
> both work on the same data sets, so in the event the line goes down, we
> would
> prefer Site1 be read-only to avoid any data conflicts. Additionally, we
> like
> to add redundancy in the HQ location to prevent down-time in the event of
> server hardware failure, etc.
>
> After some research and reading, here's what we've come up with:
>
> HQ location:
> 1 HDR primary server
> 1 HDR secondary server
>
> Site1:
> 1 RSS server (readonly)
>
> Does this sound reasonable?
> When a program is run from Site1, and an update/insert/delete statement is
> run, how do we set it up so that the statement gets sent up to the HQ
> primary
> transparently?
> I read that schema change propagation only happens in Flexible Grid and
> not in
> ER, so when a schema change is made on the HDR primary, does it
> automatically
> propagate down to the secondary and RSS servers? I'm a little confused
> about
> the difference between Flexible Grid and ER and how they work together.
>
> Thanks In Advance,
> -Justin
>
>
>
>
*******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>

--089e0160a3b8e43e8c04dd6658f1

*******************************************************************************
Forum Note: Use "Reply" to post a response in the discussion forum.

Messages In This Thread

[ View Thread ] [ Post Response ] [ Return to Index ] [ Read Prev Msg ] [ Read Next Msg ]

IDS Forum is maintained by Administrator with WebBBS 5.12.