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 ]

Classics Forum

Re: ESQL/C Programs take very long time to start u

Posted By: Fernando Nunes
Date: Wednesday, 18 April 2018, at 6:15 a.m.

In Response To: Re: ESQL/C Programs take very long time to start u (RICHARD SPITZ)


I've been reading this thread with interest, but I haven't been able to try
to setup any tests which I think I'd need in order to provide some more
relevant info,
Meanwhile I noticed your comment on my blog... so I think It's better to
keep the discussion in a single place (here).

I think you're approaching this the wrong way. You're connecting the
problem with PAM, and I think it has nothing to do with PAM, although it is
probably caused by changes on the system that were done because of PAM.
(I suppose it would be hard to write a more confusing sentence...)

ESQL/C will most probably (that's what I'd like to test/debug) need to get
the user ID *before* trying to connect to IDS. And that's where it's taking
time. Not on the database server authentication. That's why I state it's
not related to PAM authentication. But I assume that in order to configure
PAM you changed your system to recognize the AD/LDAP users as local
users.... That probably means that the LDAP integration software you're
using "hijacks" some internal functions/libraries...

You stated:

open("/proc/self/loginuid", O_RDONLY) = 3
read(3, "1004", 12) = 4
close(3) = 0

open("/proc/self/loginuid", O_RDONLY) = 3
read(3, "4294967295", 12) = 10

When you say "interactive" may I assume you opened an SSH/telnet to the
server using the user name of the user? Or have you done an su/sudo?
Assuming you did that directly the login process is going through the
authentication and creates the "session context" that makes the calls run

From this thread:

sounds like the file /proc/self/loginuid is created/populated by a PAM
module used by the system during a normal login (ssh/telnet etc.)
This is not being set when a daemon (Informix) changes a process identity
which is what the SYSTEM SPL instruction triggers.

I'd say you have to follow one of two routes (note that this is really a
sysadmin issue, not a database issue):

1- Understand why the process takes time after trying to get that info from
the file. Is it calling a daemon for cache, talking to the LDAP server,
etc?. And how can that time be reduced?

2- Check the use of the pam_loginuid in your system. A few links that may
help, but this was just a very quick search:

Sorry for not being more helpful, but this is really a problem on what your
system needs to do, when a process tries to understand the user under which
it's running. I suppose the delay is also noticeable when you do the login.

Some other thoughts....

1- Can you change the ESQL/C to CONNECT with a specific user? Maybe in that
case it doesn't need to get the UID? But this is a wild guess
2- You probably can reproduce this by scheduling the process in the
crontab. This may help to show your fellows sysadmins that the problem is
not related to Informix. If that's the case it may change their attitude
(if it's not correct now)
3- On many ocassions this weird delays are caused by issues in reverse
lookups (IP to names). Try to make sure that the server, the LDAP server
and any other server involved is able to reverse lookup the IP addresses of
the involved servers "fast"

I honestly don't know (strace should help) what ESQL/C calls when it
starts.... I'm sure Jonathan Leffler would be able to provide some more
info on this, but I haven't seen him here for a while. You can try to put
the question on stackoverflow as he currently monitors it and has been very
responsive. That could help the sysadmins to improve the times and
understand the issue. Note that in noway ESQL/C directly accesses the
/proc/self/loginuid. That's a consequence on a system call and your system


On Mon, Apr 16, 2018 at 12:35 PM, RICHARD SPITZ <> wrote:

> Here's an update for anyone who's interested, although no solution yet.
> It indeed seems to be a user authentication issue. The ESQL/C programs
> read
> the login uid from /proc/self/loginuid, and the results differ depending
> on
> the program being run interactively from the shell or not:
> Interactive:
> open("/proc/self/loginuid", O_RDONLY) = 3
> read(3, "1004", 12) = 4
> close(3) = 0
> Non-interactive:
> open("/proc/self/loginuid", O_RDONLY) = 3
> read(3, "4294967295", 12) = 10
> close(3)
> "4294967295" is effectively "-1", which is normal since the process was
> not
> called from a login shell. Since this uid is not found in /etc/passwd, the
> program switches to sss for user authentication, where of course this uid
> is
> also not found. Next "getuid()" is called, which then returns the correct
> uid
> the program is running under, and everything is running smoothly from then
> on.
> I'm currently waiting for our sysadmins to setup a virtual test server for
> me
> where I can play with different configurations for IDS, PAM etc. Will keep
> you
> posted.
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.

Fernando Nunes
My email works... but I don't check it frequently...

Messages In This Thread

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

Classics Forum is maintained by Administrator with WebBBS 5.12.