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IDS Forum

Re: Locking & Logging Issue

Posted By: MICHAEL HOFFMAN
Date: Thursday, 16 September 2010, at 1:57 p.m.

In Response To: Re: Locking & Logging Issue (Alexandre Marini)

Alexandre,
No recent system or code changes... at least 9 months. "Time of Installation" was 4 years ago, but the locking issue has become more frequent (to the point of blocking nearly every insert) in the last month or so. Around the same time we noticed the increase in searches.

All dbspaces are Raw disk. Wouldn't want it any other way, right? :-)

We have a connection pool from the web-app that consistently keeps 25 threads open. (Last line from onstat -u: 23 active, 128 total, 27 maximum concurrent)

Not sure what memory or CPU vps have to do with locking or logging issues, but since you asked, here is the rest of the info:

32GB of system memory, Informix is using 2157568 Kbytes.

Server Configs:
SHMBASE 0x10a000000 # Shared memory base address
SHMVIRTSIZE 512000 # initial virtual shared memory segment size
SHMADD 128000 # Size of new shared memory segments (Kbytes)
DEADLOCK_TIMEOUT 60 # Max time to wait of lock in distributed env.
LOCKS 32000 # Maximum number of locks
MULTIPROCESSOR 1 # 0 for single-processor, 1 for multi-processor
NUMCPUVPS 2 # Number of user (cpu) vps
SINGLE_CPU_VP 0 # If non-zero, limit number of cpu vps to one
NUMAIOVPS 1 # Number of IO vps
DBSPACETEMP # Default temp dbspaces

onstat -g glo:
----------------
Virtual processor summary:
class vps usercpu syscpu total
cpu 2 11895.07 1210.40 13105.47
aio 1 0.00 0.05 0.05
shm 1 0.00 0.00 0.00
lio 1 0.00 0.00 0.00
pio 1 0.00 0.00 0.00
adm 1 0.00 0.00 0.00
msc 1 0.02 0.01 0.03
total 8 11895.09 1210.46 13105.55

On Thu, Sep 16, 2010 at 10:49 AM, Alexandre Marini <amarini@fazenda.ms.gov.br> wrote:

Hi Michael.

What did you mean with "since time of installation"???

Did you upgrade your system recently???

There were any architecture change???

If you can, answer these questions, ok??

How are the server configs:

CPU vps, NETTYPE (how many simultaneous sessions do you have?)

How is your hardware configuration (how many cpu cores, and memory do you have, and how much memory Informix is using now?)

Are you using what kind of dbspaces/chunks ?? Raw devices, or cooked files???

That should explain most of your issues, ok?

Best regards.

Em 16/09/2010 11:38, MICHAEL HOFFMAN escreveu:
> Hi All,
> [Please let me know what other information I should provide]
>
> Here's the full story on our problem. First off: versions!
> Informix Dynamic Server Version 11.50.FC6 (development) and 9.40.FC4
> (production)
> Excalibur Datablade ETX.1.30.FC7
> UNIX SunOS 5.9 Generic_122300-51
>
> Issue Synopsis: We use the Excalibur Datablade to search legal documents,
> utilizing the etx_contains function. New documents are inserted on an
> as-needed basis (potentially several times a day). The users complained that
> 'large' documents were failing to load, since time of installation.
> In the last month, however, they can now only insert the smallest of
> documents. Coincidentally, we observed a higher load of searches on our
> database. Also, the Logical Log usage has increased exponentially (from
> roughly 6 5MB logs filled per day to over 100!).
>
> Document content is stored in an sbspace, connected to the Datablade.
>
> No code changes have been made in over 9 months.
>
> We noticed in our logs that the Inserts take roughly 600 - 700 msecs. The
> searches take upwards of 1600 msecs.
>
> *** Problem1: Logical Logs are filling excessively fast, when only searches
> are being performed. Searches are NOT done inside of explicit transactions.
> However, onstat -x shows every select using the etx_contains function is
> creating a logged transaction.
>
> *** Problem2: Sometimes, a Select using the etx_contains function begins and
> then an Insert is started on the same table, while the Select is in 'prepare'
> mode. When the Select begins to process, the insert statement fails!
>
> onstat -k shows HDR+IS locks being placed on the Large Smart Object Header as
> soon as the Select kicks off:
> 10af47ee8 0 14f0ba9c8 10af19168 HDR+IS 40000b 0 0
>
> Could this be blocking the Insert from exclusively locking the table? Why
> wouldn't one statement wait for the other to finish?
> SET LOCK MODE TO WAIT 30 for the insert
> SET LOCK MODE TO WAIT 10 for the select
>
> Both processes are using Isolation Level Committed Read -- we cannot use Dirty
> Read for the select due to business requirements. But we tried Dirty Read
> anyway, and the HDR+IS locks were still placed.
>
> There are no errors listed in the Informix message log (onstat -m).
>
> ===========================
> Our error logs read:
> ------
> [9/13/10 12:25:12:558 MDT] 00000044 SystemOut O [0000] anonymous DEBUG
> ContentDAO -
> insert into ct(ct_id, sdoc_id, xml_1) values (?,?,?)
> [9/13/10 12:25:12:801 MDT] 00000044 SystemOut O [0000] anonymous ERROR .CtDAO
> -
> java.sql.SQLException: A select is in progress, so updating the index is not
> allowed.
> [9/13/10 12:25:12:807 MDT] 00000044 SystemOut O [0000] anonymous ERROR
> FileERDAO -
> Exception in FileERDAO.insertNewCt:com.rustts.model.DAO.DAOException: Error in
> CtDAO.create(Connection, CtVO).
> A select is in progress, so updating the index is not allowed.Error Code:-937
> ------
>
> Most of the inserts process without incident, but the issue arises when a
> different thread passes a Select to the 'ct' table at the same time.
> The Select statement takes about 400 msecs to Prepare, and as soon as it kicks
> off, the Insert is blocked and causes an error.
>
> This is from a second log file, ***compare the timestamps***:
> -------
> [9/13/10 12:25:12:382 MDT] 0000003e SystemOut O [0000] anonymous INFO
> KeywordSearchDAO -
> select p.ct_id, p.xml_1, s.sdoc_id,cc.ccrnum,cc.ccrn_vol
> from ct p,sdoc s,ccd cc
> where p.sdoc_id=s.sdoc_id and s.ccd_id=cc.ccd_id
> and etx_contains(p.xml_1, Row(?, 'SEARCH_TYPE=PHRASE_EXACT &
> MAX_MATCHES=1000'), rc # etx_ReturnType)
> order by cc.ccrn_vol, p.ct_id
> [9/13/10 12:25:12:383 MDT] 0000003e SystemOut O [0000] anonymous INFO
> KeywordSearchDAO - Binding keyword "silence", 100
> [9/13/10 12:25:12:800 MDT] 0000003e SystemOut O [0000] anonymous INFO
> KeywordSearchDAO - START ROW100
> [9/13/10 12:25:12:801 MDT] 0000003e SystemOut O [0000] anonymous INFO
> KeywordSearchDAO - total time 428 msecs
> --------
>
> Thanks for any and all assistance!
> Michael Hoffman
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>

--

Alexandre Marini

Tecnologia da Informação - DBA

msn: alexandre_marini@hotmail.com

SEFAZ-MS / SGI-UGSR / Sistemas IBM-Informix

Cert-Info-Mgmt_color

IBM Informix Dynamic Server Certified Professional V10 / V11

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