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: Question on SHMVIRTSIZE

Posted By: ART KAGEL, BLOOMBERG/ 731 LEXIN
Date: Thursday, 17 May 2007, at 6:36 p.m.

In Response To: Re: Question on SHMVIRTSIZE (DL Redden)

My rule of thumb for BTR is single digits. Six or lower is fine for most OLTP
but even 8 or 9 is good. When I see 12 or higher the server is noticably
slowed.

Art S. Kagel
----- Original Message -----
From: DL Redden <ids@iiug.org>
At: 5/17 18:10:42

Art,

What is a respectable BTR? I know that it depends but do you, or anyone else
for that matter, have any rules of thumb that make you start to worry on say a
primarily OLTP instance and a primarily OLAP instance?

Thanks,

DL

----- Original Message ----
From: "ART KAGEL, BLOOMBERG/ 731 LEXIN" <kagel@bloomberg.net>
To: ids@iiug.org
Sent: Monday, May 14, 2007 11:29:04 AM
Subject: Re: Question on SHMVIRTSIZE [9144]

Your metrics indicate that you MAY need more BUFFERS:

BR = (34018215 / (243924199 + 1308089992)) * 100.00 = 2.1900
BTR = (((243924199 + 1308089992) / 155000) / 110.5) = 90.6153
RAU = (253872383/(137210564+13433495+105455888)) * 100.00 = 99.1300

The BTR of 90.6 is VERY high. You are turning over your entire buffer pool
every 39.7 seconds (or at least thrashing some subset many times a minute)! I
would take that 128MB you want to add to the virtual memory pool and use it
and
more to add another 150000 buffers. You can fine tune that by monitoring
onstat
-P over time to determine the actual number of buffers being thrashed
(probably
it's a small number of tables that are highly active and are perpetually
forcing each other's pages out of the cache).

Art S. Kagel

----- Original Message -----
From: Keith Simmons <ids@iiug.org>
At: 5/09 5:14:22

On 08/05/07, Mary Gregory <mary.gregory@rheem.com> wrote:
> I still haven't found a good way to determine whether or not adding more
> virtual memory to the instance would speed up queries or not. I think I
> might try to add another 128 MB just to see what happens. Also, I am
> thinking about adding some more BUFFERS but I am trying to be very
> cautious about not increasing my checkpoint times. From what I see
> right now, everything is performing really well and I don't really need
> to make any changes but you all might see something I don't. (I removed
> some of the onconfig file parameters to save a little space.)
>
> ONCONFIG PARAMETERS
>
> ROOTNAME a_rootdbs # Root dbspace name
> ROOTPATH /dev/inf/chunk001 # Path for device containing root
> dbspace
> ROOTOFFSET 0 # Offset of root dbspace into device
> (Kbytes)
> ROOTSIZE 500000 # Size of root dbspace (Kbytes)
> PHYSDBS a_plogdbs # Location (dbspace) of physical log
> PHYSFILE 100000 # Physical log file size (Kbytes)
> LOGFILES 41 # Number of logical log files
> LOGSIZE 50000 # Logical log size (Kbytes)
> SERVERNUM 1 # Unique id corresponding to a OnLine
> instance
> DBSERVERNAME online_shm # Name of default database server
> DBSERVERALIASES online_tcp # List of alternate dbservernames
> NETTYPE ipcshm,3,75,CPU # Configure poll thread(s) for nettype
> NETTYPE soctcp,6,200,NET # Configure poll thread(s) for nettype
> DEADLOCK_TIMEOUT 240 # Max time to wait of lock in
> distributed env.
> RESIDENT 1 # Forced residency flag (Yes = 1, No =
> 0)
> MULTIPROCESSOR 1 # 0 for single-processor, 1 for
> multi-processor
> NUMCPUVPS 5 # Number of user (cpu) vps
> SINGLE_CPU_VP 0 # If non-zero, limit number of cpu vps
> to one
> NOAGE 1 # Process aging
> AFF_SPROC 0 # Affinity start processor
> AFF_NPROCS 0 # Affinity number of processors
> LOCKS 500000 # Maximum number of locks
> BUFFERS 155000 # Maximum number of shared buffers
> NUMAIOVPS 2 # Number of IO vps
> PHYSBUFF 64 # Physical log buffer size (Kbytes)
> LOGBUFF 64 # Logical log buffer size (Kbytes)
> CLEANERS 64 # Number of buffer cleaner processes
> SHMBASE 0x0 # Shared memory base address
> SHMVIRTSIZE 1792000 # initial virtual shared memory segment
> size
> SHMADD 256000 # Size of new shared memory segments
> (Kbytes)
> SHMTOTAL 0 # Total shared memory (Kbytes).
> 0=>unlimited
> CKPTINTVL 600 # Check point interval (in sec)
> LRUS 64 # Number of LRU queues
> LRU_MAX_DIRTY 4.000 # LRU percent dirty begin cleaning limit
> LRU_MIN_DIRTY 2.000 # LRU percent dirty end cleaning limit
> TXTIMEOUT 0x12c # Transaction timeout (in sec)
> STACKSIZE 64 # Stack size (Kbytes)
>
> DYNAMIC_LOGS 2
> LTXHWM 40
> LTXEHWM 55
>
> # Read Ahead Variables
> RA_PAGES 20 # Number of pages to attempt to read
> ahead
> RA_THRESHOLD 8 # Number of pages left before next group
>
> DBSPACETEMP
> tempdbs1,tempdbs2,tempdbs3,tempdbs4,tempdbs5,tempdbs6,tempdbs7
>
> FILLFACTOR 90 # Fill factor for building indexes
>
> # Parallel Database Queries (pdq)
> MAX_PDQPRIORITY 0 # Maximum allowed pdqpriority
> #DS_MAX_QUERIES # Maximum number of decision support
> queries
> #DS_TOTAL_MEMORY # Decision support memory (Kbytes) TURN THIS
> OFF AFTER THE IMPORT
> DS_TOTAL_MEMORY # Decision support memory (Kbytes) TURN
> THIS OFF AFTER THE IMPORT
> DS_MAX_SCANS 1048576 # Maximum number of decision support
> scans
> DATASKIP off
> OPTCOMPIND 2 # To hint the optimizer
> DIRECTIVES 1 # Optimizer DIRECTIVES ON (1/Default) or
> OFF (0)
> ONDBSPACEDOWN 2 # Dbspace down option: 0 = CONTINUE, 1 =
> ABORT, 2 = WAIT
> OPCACHEMAX 0 # Maximum optical cache size (Kbytes)
> # HETERO_COMMIT (Gateway participation in distributed transactions)
> # 1 => Heterogeneous Commit is enabled
> # 0 (or any other value) => Heterogeneous Commit is disabled
> HETERO_COMMIT 0
> BLOCKTIMEOUT 3600 # Default timeout for system block
> SYSALARMPROGRAM /home/informix/9.40/etc/evidence.sh # System Alarm
> program path
> # Optimization goal: -1 = ALL_ROWS(Default), 0 = FIRST_ROWS
> OPT_GOAL -1
> ALLOW_NEWLINE 0 # embedded newlines(Yes = 1, No = 0 or
> anything but 1)
> BAR_BSALIB_PATH /opt/omni/lib/libob2informix_64bit.sl
> DS_MAX_QUERIES 6 # Maximum number of decision support
> queries
>
> ONSTAT -P
>
> IBM Informix Dynamic Server Version 9.40.FC4 -- On-Line -- Up 4 days
> 14:29:2
> 2 -- 2196484 Kbytes
>
> Profile
> dskreads pagreads bufreads %cached dskwrits pagwrits bufwrits %cached
> 535710112 1308089992 17065711597 96.86 31296277 73506490 243924199
> 87.17
>
> isamtot open start read write rewrite delete commit
> rollbk
> 12889143879 61483810 410801398 10058850470 60258603 10476107 6562628
> 9953760 3
> 732
>
> gp_read gp_write gp_rewrt gp_del gp_alloc gp_free gp_curs
> 0 0 0 0 0 0 0
>
> ovlock ovuserthread ovbuff usercpu syscpu numckpts flushes
> 0 0 0 157714.53 101146.03 1047 2882
>
> bufwaits lokwaits lockreqs deadlks dltouts ckpwaits compress seqscans
> 34018215 3531 16248413925 10 0 2150 3447796
> 2746919
>
> ixda-RA idx-RA da-RA RA-pgsused lchwaits
> 137210564 13433495 105455888 253872383 7973596
>
> -----Original Message-----
> From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of
> Robert Roussey(IT)
> Sent: Wednesday, May 02, 2007 5:14 PM
> To: ids@iiug.org
> Subject: RE: Question on SHMVIRTSIZE [9061]
>
> If you know the session of the batch job, you can see what pieces of
> memory it is using with "onstat -g mem".
> "onstat -g ses" will show all sessions and their total use of SHM.
> If you are using PDQ for the batch job, you should see it reflected by
> getting snapshots of "onstat -g mgm" while it is running.
>
> Maybe post your ONCONFIG file and people can comment on it as well as
> a 24hr snapshot of "onstat -p".
>
> Bob Roussey
> Unix / Informix Administration
> Spirit Airlines
> Robert.Roussey@SpiritAir.com
>
>
>

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

With 9.4 you will be using 'fuzzy' checkpoints, therefore increasing
BUFFERS will have minimal effect on checkpoints. Your Buffers Read and
Write %ages are looowww, I would bump buffers to 200000 (to start)
then 250000 or even 300000. (Can't remember your platform but have a
recollection of plenty of memory and even on a 4Kb page machine this
is only 1.2 Gb). That will improve your %ages. Also you need to
increase LRUs (and Cleaners) to reduce the number of Buffer Waits. Try
127 for each.
If the engine has not added any additional virtual segment (onstat -g
seg) then there is little point in increasing SHMVIRTSIZE as more is
not required.

Keith

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

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

*******************************************************************************
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.