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 - - 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 - - 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 - - DNS impact on Informix / Impacto do DNS no Informix... Read
8 Sep 11 - - 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 - - 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: Unique constraints should be used with replica

Posted By: Madison Pruet
Date: Monday, 2 May 2016, at 3:42 p.m.

In Response To: Unique constraints should be used with replicated (FRANK)

I'm pretty sure that we modified the code in one of the 11.x versions so that we actually applied rows with unique indexes as though they were unique constraints. The problem is that with unique constraints, we can do deferred constraint checking so that the check was made as part of the commit. We couldn't do that with unique indexes, even though a unique index and a unique constraint is physically pretty much the same thing. Because we couldn't do deferred reference checking as part of the commit, we could get into trouble if two transactions were being applied in which one transaction created a parent row and a subsequent transaction created the child. On target servers, the physical apply of the rows could be in parallel while on the source it could not because it was done by a single session serially. So initially we put in the code to check for unique indexes and suggested that they be unique constraints instead. Of course once we got the code in place to make ER apply all unique indexes as though they were unique constraints, then we could defer referential checking until the commit. And since the commits are always done in the same order as the original transaction, the issue went away.

I'm guessing that we simply forgot to remove the warning.
Madison Pruet
Retired and Loving it

On Monday, May 2, 2016 12:25 PM, FRANK <> wrote:

IDS12.10 FC4.

Occasionally saw this,

17:03:35 Warning - Table noaa:informix.ds_head_np

is replicated and contains a unique index

rather than a unique constraint.
17:03:35 Unique constraints should be used with replicated tables

rather than a simple unique index.

Any comments or potential negative?

This table is ER replicated with no warning in old versions when it was
originally defined. Attached table definition.


create table "informix".ds_head_np

inventory_id serial not null ,

dataset_name varchar(255,44) not null ,

dataset_size_bytes int8,

datatype_name char(10) not null ,

datatype_version char(10),

ingest_status char(10),

ingest_dt datetime year to second not null ,

orig_data_filenm varchar(255,44) not null ,

distribution_site char(1) not null ,

data_source char(10),

has_visual_file char(1),

restriction_level smallint,

accessible char(1)

default 'Y',

uuid char(40),

primary key (inventory_id) constraint "informix".ds_head_np_pk
) with crcols in dbdata22 extent size 8192 next size 8192 lock mode row;
revoke all on "informix".ds_head_np from "public" as "informix";

create unique index "informix".ds_head_np_idx0 on "informix".ds_head_np

(dataset_name) using btree in dbdw08;
create index "informix".ds_head_np_idx1 on "informix".ds_head_np

(uuid) using btree in dbdata23;
create index "informix".ds_head_np_idx2 on "informix".ds_head_np

(datatype_name) using btree in dbdata01;
create index "informix".ds_head_np_idx3 on "informix".ds_head_np

(datatype_version) using btree in dbdata01;
create index "informix".ds_head_np_idx4 on "informix".ds_head_np

(ingest_dt) using btree in dbdata01;

alter table "informix".ds_head_np add constraint (foreign key

(datatype_name) references "informix".datatypes constraint

alter table "informix".ds_head_np add constraint (foreign key

(datatype_version) references "informix".datatyp_vers constraint



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.