SAP Knowledge Base Article - Preview

2246782 - Unable to kill a spid that execute a query with a large IN clause or a lot of OR predicates - SAP ASE

Symptom

  • Running a query with a very large IN clause or lots of search arguments OR-ed together
  • The optimizer may take a long time to optimize the query while it examines the histograms
  • During this time the process in ASE may be unkillable and could use a large amount of procedure cache
  • dbcc stacktrace may show the following functions:
    upyield
    memalloc
    GtPRS::GtInitGcPerGt
    HistStatObject::HistStatObject
    StGcInfo::StGcInfo
    StTcInfo::StTcAllocateCellNormalized
    TcElement::TcAllocateColCost
    HasHistAlgebraState::HasFindColCost
    StTcInfo::StTcAndSargIntoHist
    HasHistAlgebraState::HasCellNormalizedInit
    OptBlock::OptPhase2bInit


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Environment

SAP Adaptive Server Enterprise (ASE) 15.7 and 16.0

Product

SAP Adaptive Server Enterprise 15.7 ; SAP Adaptive Server Enterprise 16.0

Keywords

predicate, huge, "OR predicate", kill, OptPhase2bInit, CnhCellNormalizedHist, 791364, CR791364, , KBA , BC-SYB-ASE , Sybase ASE Database Platform (non Business Suite) , Bug Filed

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