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

count/insert vs insert

Posted By: Cesar Inacio Martins
Date: Wednesday, 21 September 2011, at 4:49 p.m.

Hi,

I already see here some recommendations when execute an insert , if
should check before or not if the record exists or if better check if
occur some constraint error (unique index/PK).

As far I remember , the better way on most of the cases, is try insert
and than check if was occur successfully.
I executed a few tests and have 3 doubts. Please follow the tests bellow.
(ifx 11.50 fc8 aix , 4gl 7.32)

After write a little code using 4GL and executing 5 times :
1) execute just an insert for a record what don't exists on the table.
(the insert occur successful)

sesid 7396
2) execute a "select first 1 1 from table" + if sqlca.sqlcode =
notfound, than execute the insert (the insert occur successful because
the record don't exists)

sesid 7409
3) execute just an insert for a record where the unique key (not PK)
already exists (the program abend with error -239)

sesid 7412
4) execute a "select first 1 1 from table" + if sqlca.sqlcode =
notfound, so the insert wasn't executed because the record already exists

sesid 7421
5) execute just an insert for a record where the PK already exists (the
program abend with error -268)

sesid 7470

(I add a PK over the UK)

The result what I got appear to confirm, using just the insert is better
and check later if occur some error.
And appear be better if use PK instead only UK.
This outputs I gather from sys* , saving at sysdbclose...

sesid lockreqs lockwts logrecs maxlog_kb isreads iswrites isrewrites
isdeletes iscommits seqscans total_sorts cpu_time
7396 928 0 6 0.56 664 51 0 0 1 3 0
0.73029
7409 867 0 6 0.56 636 51 0 0 1 3 0
0.95809
7412 854 0 8 0.61 644 52 0 0 0 3 0
0.61418
7421 888 0 0 0.00 660 51 0 0 0 3 0
0.8001
7470 1042 0 10 0.74 718 50 0 0 0 3 0
0.07048

The fields what I pay attention: logrecs, maxlog_kb, iscommits, cpu_time

sesid logrecs maxlog_kb iscommits cpu_time
7396 6 0.56 1 0.73029
7409 6 0.56 1 0.95809
7412 8 0.61 0 0.61418
7421 0 0.00 0 0.8001
7470 10 0.74 0 0.07048

What caught my attention is the use of logical log records and the
little cpu_time when the table have a PK instead only the UK.

My Doubts
1)On the session 7412 , where run the insert and check for errors
after(UK violated). I strange the grown of logical log record.
Checking the logs (with onlog) I see the engine adding the 2 others
index (ADDITEM) before add the UK index and then abend with error.
Should be better the engine always insert first the UK constraints , to
avoid the ADDITEM and the rollback of each one if occur a violation on
the constraint?

2) On this situation (sesid 7412), where the CPU consumption is instead
check before if the record exists (sesid 7421) and having more logical
log records... this way still better way to work ? considering the using
of logical log x cpu_time (looking at this isolate context, test-by-test)

3) On sesid 7470, where I add a PK to table, the engine appear have the
same behave of UK , adding each index of the table before the UK/PK
(onlog/ADDITEM) and then abending with -268 error. How could be the
engine consume 10 times less CPU of the database!???

Cesar

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.