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Deadlocks on a specific pages

  • 1.  Deadlocks on a specific pages

    Posted 12-12-2008 03:46 AM
    Hi Everyone:

    We are having a lot of deadlocks on some specific pages. We analize at
    the record level what we have, and we have a calc record and via records
    on the same area, and in the chains there are more than 100 recors via
    for any calc owner.The order in the set is next. There is a lot of
    stores of the via records. The chains updated are for differents calc
    records , there is not a concentration on only one calc record. I
    checked the print space and notice that in the total of 710,000 pages I
    have 12 logicaly fullpages for at least one week, that means that we
    are not falling on logically full pages periodically. The area is only
    25% full in total, there is a lot of space, but there is a lot of
    deadlocks pointing on some pages. I pint the pages and its look like
    they are o.k. I'm still try to figure out whats going on, I'm thinking
    what is better, to run unload/reload with a page reserve big enough, or
    on the other hand unload/reload and decrease the page size of the pages.
    What can I check to make take the correct decision . Any ideas and how
    to proceed or what to analize to detect the problem ?? I also checked
    and I don't see any run unit spending a lot of time taking the area, or
    any exclusive update use of the area. Any help wil be great!!!

    Thanks.

    J. Sotela
    _________________________________________________________________
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    Normal

    Normal
    Re: Deadlocks on a specific pages
    "Javier,

    The big question is what kind of a deadlock? Space management or
    individual record deadlock?

    Also, are these/this record variable? =20

    One other question, how distributed are the calc records? Even across
    the area or clustered among some page portion of the area?

    We have deadlock problems, but it's because we have multiple
    transactions storing the same record type with the same calc key. Can't
    change so they've programmed around the problem.

    Dick

    Richard Pierce
    (617) 973-8911
    richard.pierce@state.ma.us


  • 2.  Re:Deadlocks on a specific pages

    Posted 12-12-2008 03:46 AM
    Hi Everyone:
    =20
    We are having a lot of deadlocks on some specific pages. We analize at
    the record level what we have, and we have a calc record and via records
    on the same area, and in the chains there are more than 100 recors via
    for any calc owner.The order in the set is next. There is a lot of
    stores of the via records. The chains updated are for differents calc
    records , there is not a concentration on only one calc record. I
    checked the print space and notice that in the total of 710,000 pages I
    have 12 logicaly fullpages for at least one week, that means that we
    are not falling on logically full pages periodically. The area is only
    25% full in total, there is a lot of space, but there is a lot of
    deadlocks pointing on some pages. I pint the pages and its look like
    they are o.k. I'm still try to figure out whats going on, I'm thinking
    what is better, to run unload/reload with a page reserve big enough, or
    on the other hand unload/reload and decrease the page size of the pages.
    What can I check to make take the correct decision . Any ideas and how
    to proceed or what to analize to detect the problem ?? I also checked
    and I don't see any run unit spending a lot of time taking the area, or
    any exclusive update use of the area. Any help wil be great!!!
    =20
    Thanks.
    =20
    J. Sotela=20
    _________________________________________________________________
    Discover the new Windows Vista
    http://search.msn.com/results.aspx?q=3Dwindows+vista&mkt=3Den-US&form=3DQ=
    BRE
    "
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    Normal

    Normal
    Re: Deadlocks on a specific pages
    "Hi Richard:
    =20
    About your questions:
    =20
    The message of the deadlock point to a page=2C not a record=2C then I guess=
    the deadlock is with smp.
    The record is fixed lenght.The owner record is calc and spread accordingly.=
    I check the differents calc records and they are on diffferent pages. Via =
    records are located in the same page or in other pages.
    The records stores are the via records=2C not the calc records.
    =20
    Thanks.
    =20
    J. Sotela
    =20
    Date: Fri=2C 12 Dec 2008 09:07:48 -0500> From: Richard.Pierce@STATE.MA.US=
    Subject: Re: Deadlocks on a specific pages> To: IDMS-L@LISTSERV.IUASSN.CO=
    M> > Javier=2C> > The big question is what kind of a deadlock? Space manage=
    ment or> individual record deadlock?> > Also=2C are these/this record varia=
    ble? > > One other question=2C how distributed are the calc records? Even a=
    cross> the area or clustered among some page portion of the area?> > We hav=
    e deadlock problems=2C but it's because we have multiple> transactions stor=
    ing the same record type with the same calc key. Can't> change so they've p=
    rogrammed around the problem.> > Dick> > Richard Pierce> (617) 973-8911> ri=
    chard.pierce@state.ma.us> > >


  • 3.  Re:Re: Deadlocks on a specific pages

    Posted 12-12-2008 05:13 AM
    Hi Richard:

    About your questions:

    The message of the deadlock point to a page, not a record, then I guess
    the deadlock is with smp.
    The record is fixed lenght.The owner record is calc and spread
    accordingly. I check the differents calc records and they are on
    diffferent pages. Via records are located in the same page or in other
    pages.
    The records stores are the via records, not the calc records.

    Thanks.

    J. Sotela
    Date: Fri, 12 Dec 2008 09:07:48 -0500> From:
    Richard.Pierce@STATE.MA.US> Subject: Re: Deadlocks on a specific pages>
    To: IDMS-L@LISTSERV.IUASSN.COM> > Javier,> > The big question is what
    kind of a deadlock? Space management or> individual record deadlock?> >
    Also, are these/this record variable? > > One other question, how
    distributed are the calc records? Even across> the area or clustered
    among some page portion of the area?> > We have deadlock problems, but
    it's because we have multiple> transactions storing the same record type
    with the same calc key. Can't> change so they've programmed around the
    problem.> > Dick> > Richard Pierce> (617) 973-8911>
    richard.pierce@state.ma.us> > >


  • 4.  Re:Re: Deadlocks on a specific pages

    Posted 12-12-2008 05:13 AM
    Hi Richard:
    =20
    About your questions:
    =20
    The message of the deadlock point to a page, not a record, then I guess
    the deadlock is with smp.
    The record is fixed lenght.The owner record is calc and spread
    accordingly. I check the differents calc records and they are on
    diffferent pages. Via records are located in the same page or in other
    pages.
    The records stores are the via records, not the calc records.
    =20
    Thanks.
    =20
    J. Sotela
    =20
    Date: Fri, 12 Dec 2008 09:07:48 -0500> From:
    Richard.Pierce@STATE.MA.US> Subject: Re: Deadlocks on a specific pages>
    To: IDMS-L@LISTSERV.IUASSN.COM> > Javier,> > The big question is what
    kind of a deadlock? Space management or> individual record deadlock?> >
    Also, are these/this record variable? > > One other question, how
    distributed are the calc records? Even across> the area or clustered
    among some page portion of the area?> > We have deadlock problems, but
    it's because we have multiple> transactions storing the same record type
    with the same calc key. Can't> change so they've programmed around the
    problem.> > Dick> > Richard Pierce> (617) 973-8911>
    richard.pierce@state.ma.us> > >


  • 5.  Re:Re: Deadlocks on a specific pages

    Posted 12-12-2008 05:13 AM
    Hi Richard:

    About your questions:

    The message of the deadlock point to a page, not a record, then I guess
    the deadlock is with smp.
    The record is fixed lenght.The owner record is calc and spread
    accordingly. I check the differents calc records and they are on
    diffferent pages. Via records are located in the same page or in other
    pages.
    The records stores are the via records, not the calc records.

    Thanks.

    J. Sotela
    Date: Fri, 12 Dec 2008 09:07:48 -0500> From:
    Richard.Pierce@STATE.MA.US> Subject: Re: Deadlocks on a specific pages>
    To: IDMS-L@LISTSERV.IUASSN.COM> > Javier,> > The big question is what
    kind of a deadlock? Space management or> individual record deadlock?> >
    Also, are these/this record variable? > > One other question, how
    distributed are the calc records? Even across> the area or clustered
    among some page portion of the area?> > We have deadlock problems, but
    it's because we have multiple> transactions storing the same record type
    with the same calc key. Can't> change so they've programmed around the
    problem.> > Dick> > Richard Pierce> (617) 973-8911>
    richard.pierce@state.ma.us> > >


  • 6.  Re: Deadlocks on a specific pages

    Posted 12-12-2008 05:13 AM
    Hi Richard:
    =20
    About your questions:
    =20
    The message of the deadlock point to a page, not a record, then I guess
    the deadlock is with smp.
    The record is fixed lenght.The owner record is calc and spread
    accordingly. I check the differents calc records and they are on
    diffferent pages. Via records are located in the same page or in other
    pages.
    The records stores are the via records, not the calc records.
    =20
    Thanks.
    =20
    J. Sotela
    =20
    Date: Fri, 12 Dec 2008 09:07:48 -0500> From:
    Richard.Pierce@STATE.MA.US> Subject: Re: Deadlocks on a specific pages>
    To: IDMS-L@LISTSERV.IUASSN.COM> > Javier,> > The big question is what
    kind of a deadlock? Space management or> individual record deadlock?> >
    Also, are these/this record variable? > > One other question, how
    distributed are the calc records? Even across> the area or clustered
    among some page portion of the area?> > We have deadlock problems, but
    it's because we have multiple> transactions storing the same record type
    with the same calc key. Can't> change so they've programmed around the
    problem.> > Dick> > Richard Pierce> (617) 973-8911>
    richard.pierce@state.ma.us> > >