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2705567 - Several MPX nodes hang for hours, huge number of versions seen -SAP IQ

Symptom

  • Coordinator unresponsive
  • Several or all secondary servers unresponsive
  • sp_iqversionuse shows tens of  thousands of versions
  • High user dbspace usage due to the huge number of versions
  • pstacks taken on the unresponsive servers show lots of st_txnMgr::WaitForTLVReplay

One of these client software are used to run queries on SAP IQ.

  • WinSQL 
  • SAS program 


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Environment

  • SAP IQ 16.0
  • SAP IQ 16.1

Product

SAP IQ 16.0 ; SAP IQ 16.1

Keywords

WinSQL, SAS, SAS_MM, Multiplex, coordinator, secondary, nodes, unresponsive, st_txnMgr::WaitForTLVReplay, TLV, Replay, version, transaction, ID, sp_iqversionuse, sp_iqcontext, sp_iqtransaction , KBA , BC-SYB-IQ , Sybase IQ , Problem

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