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2787689 - Delete query went to pending problem with stack 's_llhtable::hti_lookup_delete' and couldn't be dropped connection -- SAP IQ


A DELETE query session goes pending status with spending CPU usage on IQ16.1 SP2.14. But the same delete query has been working well in old version SP02.03 without any symptoms.

  • While repro test, found below status.

  1. It looks the delete query goes infinite loop , spendign CPU.

  2. Repro is available ONLY when Non_Ansi_Null_Varchar ='ON', default is OFF.

    Under Non_Ansi_Null_Varchar ='OFF', any delete is working well. But customer has been using the option to ON from prior versions , and now it's hard to convert the option to OFF due to existing queries.

  • When dumps stack during the pending status, it looks incorrectly working at 's_llhtable::hti_lookup_delete'.

         Thread 187 (Thread 0x7fcc0eeb8700 

.. s_llhtable::hti_lookup_delete ..
.. s_llhtable::hti_cas_delete ..
.. s_llhtable::ht_cas_delete ..
.. s_llhtable::deleteToken ..
.. s_dictionary::DeleteKeyFromHash ..
.. s_dictionary::SqueezeStrArray ..
.. s_dpNBit::Delete ..
.. hs_dp::DeleteNBit ..
.. hs_dp::DeleteInternal ..
.. hs_dp::Delete ..
.. hdb_delete_indices::Unit_of_Work ..
.. hdb_delete_indices::hdb_delete_index_iter::ExecWork



SAP IQ16.1 SP02.14


SAP IQ 16.1


delete hang, drop connection, hti_lookup_delete , DeleteKeyFromHash , CR819197, , KBA , BC-SYB-IQ , Sybase IQ , Problem

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