3591687 - HANA DML transactions stuck under thread state "AttributeEngine::Delta::_acquireRetry(int&, AttributeEngine::Delta::GuardContainerLocks*&)"

• INSERTS to a table in HANA are shown stuck under a waiting semaphore callstack "AttributeEngine::Delta::_acquireRetry(int&, AttributeEngine::Delta::GuardContainerLocks*&)" in the HANA Runtime dump trace files like '<service>_<host>.<port>.rtedump.<timestamp>.<pid>.trc' :
  

  31949621045[thr=871429]: SqlExecutor at
     0: 0x00007fc92b219849 in syscall+0x17 (libc.so.6)
     1: 0x00007fc92c1d6e00 in Synchronization::BinarySemaphore::timedWait(unsigned long, Execution::Context&) [clone .part.0]+0x100 at Basis/Synchronization/impl/LinuxFutexOps.hpp:49 (libhdbbasis.so)
     2: 0x00007fc93afa09a6 in AttributeEngine::Delta::_acquireRetry(int&, AttributeEngine::Delta::GuardContainerLocks*&)+0x72 at Basis/Synchronization/Semaphore.hpp:720 (libhdbcs.so)
     3: 0x00007fc93af774dc in AttributeEngine::BTreeAttribute<TrexTypes::StringAttributeValue>::commitOptimize(CSWriter::CommitOptimizeEnv&)+0x3c8 at AttributeEngine/Delta/DeltaGuards.h:48 (libhdbcs.so)
     4: 0x00007fc941709cc3 in CSWriter::AttributeIndexJob::run()+0xe0 at CSWriter/AttributeIndexJob.hpp:122 (libhdbcs.so)
     5: 0x00007fc941714fa9 in AttributeEngine::AttributeApi::commitOptimizeAttributes(ltt::smartptr_handle<CSWriter::CSUpdateColumns> const&, bool, bool, ltt::memory_resource*, unsigned long)+0x19d5 at AttributeEngine/AttributeApi.cpp:1330 (libhdbcs.so)
     6: 0x00007fc9474fc5d3 in void CSAccessor::Dml::DmlExecutor::writeDataGuarded<CSAccessor::Dml::InsertContext>(CSAccessor::Dml::InsertContext const&)+0x220 at CSAccessor/Dml/DmlExecutor.cpp:1069 (libhdbcsaccessor.so)
     7: 0x00007fc9474ef8a0 in CSAccessor::Dml::DmlExecutor::processInsertContext(TransactionManager::ConsistentView const&, CSAccessor::Dml::InsertContext const&)+0x390 at CSAccessor/Dml/DmlExecutor.cpp:807 (libhdbcsaccessor.so)
     8: 0x00007fc951ef2326 in TRexAPI::TableUpdateWriter::writeIntoTableContainer(TRexAPI::QueryContext*, TRexAPI::Dml::UpdateContext&, bool, bool, ltt::smartptr_handle<TRexConfig::DDLInfoVector> const&, ltt::allocator&)+0x302 at ims_search_api/TableUpdate/TableUpdateWriter.cpp:294 (libhdbcsapi.so)
  
   . . . . . .

• The M_BLOCKED_TRANSACTIONS_ view from the same runtime dump shows the same INSERTs blocking other transactions from proceeding :
  
  

  M_BLOCKED_TRANSACTIONS_[0] - (id= 387, type= private:local, flags= Crashdump RTEdump, priv= <none>)
  "BLOCKED_TRANSACTION_ID";"BLOCKED_UPDATE_TRANSACTION_ID";"BLOCKED_CONNECTION_ID";"BLOCKED_TRANSACTION_USER_NAME";"LOCK_OWNER_UPDATE_TRANSACTION_ID";"BLOCKED_TIME [local/ms]";"SCHEMA_NAME";"TABLE_NAME";"WAITING_OBJECT_TYPE";"WAITING_TABLE_ID";
  "WAITING_RECORD_ID";"LOCK_TYPE";"LOCK_MODE";"REQ_LOCK_MODE";"WAITING_PART_ID";"WAITING_PHYSICAL_PART_ID";"IS_HESITANT_LOCK"
  1622;99533640072;327585;"SAPR3";99533406498;1743069536897000;"SAPR3";"J_1IG_OFNUM";"TABLE";20821711;"KEY=D71B7DB9C65FED49, HASH=8FFD7DB9C65FCC85, RECORD_HASH_KEY=15500120779376291145";"RECORD_LOCK";"EXCLUSIVE";"EXCLUSIVE";0;0;0
  1544;99533600026;327454;"SAPR3";99533407318;1743069407007000;"SAPR3";"MSTA";"TABLE";8632996;"KEY=E584B162B8503406, HASH=1E3BB162B8544212, RECORD_HASH_KEY=16538538769168479238";"RECORD_LOCK";"NON_KEY_EXCLUSIVE";"NON_KEY_EXCLUSIVE";0;0;0
  2092;99533548817;353425;"SAPR3";99533406498;1743069252719000;"SAPR3";"J_1IG_OFNUM";"TABLE";20821711;"KEY=D71B7DB9C65FED49, HASH=8FFD7DB9C65FCC85, RECORD_HASH_KEY=15500120779376291145";"RECORD_LOCK";"EXCLUSIVE";"EXCLUSIVE";0;0;0
  (M_BLOCKED_TRANSACTIONS_, 3 rows in 188us)
  
  LOCK_OWNER_UPDATE_TRANSACTION_ID : 99533406498
  
  30464778247[thr=743700]: SqlExecutor, TID: 1224, UTID: 99533406498, CID: 327485, LCID: 327485, SEID: 844440660516499, parent: ---, SQLUserName: "SAPR3", AppUserName: " ", AppName: "ABAP: ", ConnCtx: 327485 {LDBID: 3, LCID: 327485}, StmtCtx: (1) 1406538857047121 {Parent: 327485, NAME=_SYS_DEFAULT, P=5, TIMESec=0, PARENT=, STL=48(GLOBAL), SML=150(GLOBAL), 
  SesCtx: {ObjHdl: 72056719085870080, CID: 327485, LCID: 327485, User: "SAPR3", Schema: "SAPR3", Ver: 3559, CtxID: 30741155}}, WorkloadCtx: ---, NUMA node: 2, type: "SqlExecutor", method: "ExecutePrepared", detail: "INSERT INTO "BKPF" 
  
  30464778247[thr=743700]: SqlExecutor at
     0: 0x00007fc92b219849 in syscall+0x17 (libc.so.6)
     1: 0x00007fc92c1d6e00 in Synchronization::BinarySemaphore::timedWait(unsigned long, Execution::Context&) [clone .part.0]+0x100 at Basis/Synchronization/impl/LinuxFutexOps.hpp:49 (libhdbbasis.so)
     2: 0x00007fc93afa09a6 in AttributeEngine::Delta::_acquireRetry(int&, AttributeEngine::Delta::GuardContainerLocks*&)+0x72 at Basis/Synchronization/Semaphore.hpp:720 (libhdbcs.so)
     3: 0x00007fc93af774dc in AttributeEngine::BTreeAttribute<TrexTypes::StringAttributeValue>::commitOptimize(CSWriter::CommitOptimizeEnv&)+0x3c8 at AttributeEngine/Delta/DeltaGuards.h:48 (libhdbcs.so)
     4: 0x00007fc941709cc3 in CSWriter::AttributeIndexJob::run()+0xe0 at CSWriter/AttributeIndexJob.hpp:122 (libhdbcs.so)
   . . .  . .

• Many other INSERTS to the table can be seen queued in a "Sleeping" state under the M_DEV_CONTEXTS view.
  
  

  M_DEV_CONTEXTS[0] - (id= 5, type= dev:remote, flags= AddVolumeID AddStatisticsName AddStatisticsID Crashdump RTEdump, priv= <none>)
  "STATISTICS_NAME";"STATISTICS_ID";"OWN_THREAD_ID";"OWN_CONTEXT_PTR";"STATE";"CONNECTION_ID";"APP_USER";"SYS_USER";"TRANSACTION_ID";"UPDATE_TRANSACTION_ID";"TYPE";"METHOD";"DETAIL";"COMMAND_TEXT";"PARENT_THREAD_ID";"WAIT_SYNC_NAME";"WAIT_THREAD_ID";"WAIT_THREAD_NAME";
  "START_TIME [local/us]";"LAST_WAIT_TIME [us]";"MAX_WAIT_TIME [us]";"MIN_WAIT_TIME [us]";"SUM_WAIT_TIME [us]";"AVG_WAIT_TIME [us]";"STACK_START";"STACK_SIZE [byte]";"STACK_GUARD [byte]";"DURATION [ms]";"SELF_WAIT_TIME [us]";"SELF_ACTIVE_TIME [us]";"CHILDREN_WAIT_TIME [us]";"CHILDREN_ACTIVE_TIME [us]"
  
  "SqlExecutor";7406330205;933003;0x00fffcf7e1a9e000;"Sleeping";358625;"";"";1300;99533355124;"SqlExecutor";"ExecutePrepared";"INSERT INTO ""BKPF"" ( ""MANDT"" , ""BUKRS"" , ""BELNR"" , ""GJAHR"" , ""BLART"" , ""BLDAT"" , ""BUDAT"" , ""MONAT"" , ""CPUDT"" , ""CPUTM"" , ""AEDAT"" , ""UPDDT"" , ""WWERT"" , ""USNAM"" , 
  ""TCODE"" , ""BVORG"" , ""XBLNR"" , ""DBBLG"" , ""DBBLG_GJAHR"" , ""DBBLG_BUKRS"" , ""STBLG"" , ""STJAH"" , ...";" { SQL: INSERT INTO ""BKPF"" ( ""MANDT"" , ""BUKRS"" , ""BELNR"" , ""GJAHR"" , ""BLART"" , ""BLDAT"" , ""BUDAT"" , ""MONAT"" , ""CPUDT"" , ""CPUTM"" , ""AEDAT"" , ""UPDDT"" , ""WWERT"" , 
  ""USNAM"" , ""TCODE"" , ""BVORG"" , ""XBLNR"" , ""DBBLG"" , ""DBBLG_GJAHR"" , ""DBBLG_BUKRS"" , ""STBLG"" , 
  ""S...";18446744073709551615;"(no wait)";18446744073709551615;"(no wait)";1741590963428844;512067;1230603508;0;1456193017907;13367;0x00007fbe36a60000;2371584;131072;896669;896653293;15818;0;0

• SM50 & SM66 shows many work processes in this state :
  
  

  Last Update      27.03.2025, 15:35:37  
  High Load      Reason: High load (worker load quota exceeded for UPD)  
  Total Number of Work Processes      133  
  Dialog      80 / 65 (Total/Free) , Average Load = ( 11.989 / 11.353 / 10.220)  
  Update      10 / 0 (Total/Free) , Average Load = ( 10.000 / 10.000 / 10.000) , Service with High Load (WP Load = 10.00 / Queue = 1.00 %)  
  Background      30 / 28 (Total/Free) , Average Load = ( 2.000 / 2.042 / 2.906)  
  Spool      8 / 8 (Total/Free) , Average Load = ( 0.008 / 0.013 / 0.063)  
  Update Task 2      5 / 5 (Total/Free) , Average Load = ( 0.010 / 0.007 / 0.007)  
  
  
  58    DIA    2,688    Running    701                00:01:11       . . . .    DB Insert    BKPF
  63    DIA    12,007    Running    894                00:02:01       . . . .    DB Insert    BKPF
  73    DIA    17,892    Running    990                00:02:25       . . . .    DB Insert    BKPF
  74    DIA    29,309    Running    276                00:00:26       . . . .    DB Insert    BKPF
  7    DIA    5,587    Running    39                00:00:03    High   . . . .    DB Insert    BKPF
  
   . . .
  
  
  Last Update      27.03.2025, 15:36:14  
  
   . . . . . . . . .  BKPF    DB Insert    Update    RSM13000    1
   . . . . . . . . .  BKPF    DB Insert    Update    RSM13000    1
   . . . . . . . . .  BKPF    DB Insert    Update    RSM13000    1

• At the same time an expensive select with many LIKE '?' operators can be observed running on the same table as the INSERT (BKPF) , performing a scan on the delta area  :
  
  

  336786;"1446486348295591";"04193b4fd6adebe3ffb2a7b05d76aaf1";844440671537650;72042044691288064;-1;34493890003;113816760364;-1;1743069116032696;1743069116051836;1743069116051836;"ACTIVE";"AEX,LDA,LOP,EKA,CTR,CXR,PCD,SCS";620887;
  
  "SELECT ""MANDT"" , ""BUKRS"" , ""BELNR"" , ""GJAHR"" , ""BLART"" , ""BLDAT"" , ""BUDAT"" , ""MONAT"" , ""CPUDT"" , ""CPUTM"" , ""AEDAT"" , ""UPDDT"" , ""WWERT"" , ""USNAM"" , ""TCODE"" , ""BVORG"" , ""XBLNR"" , ""DBBLG"" , 
  ""DBBLG_GJAHR"" , ""DBBLG_BUKRS"" , ""STBLG"" , ""STJAH"" , ""BKTXT"" , ""WAERS"" , ""KURSF"" , ""KZWRS"" , ""KZKRS"" , ""BSTAT"" , ""XNETB"" , ""FRATH"" , ""XRUEB"" , ""GLVOR"" , ""GRPID"" , ""DOKID"" , ""ARCID"" , ""IBLAR"" , ""AWTYP"" , ""AWKEY"" , ""FIKRS"" , 
  ""HWAER"" , ""HWAE2"" , ""HWAE3"" , ""KURS2"" , ""KURS3"" , ""BASW2"" , ""BASW3"" , ""UMRD2"" , ""UMRD3"" , ""XSTOV"" , ""STODT"" , ""XMWST"" , ""CURT2"" , ""CURT3"" , ""KUTY2"" , ""KUTY3"" , ""XSNET"" , ""AUSBK"" , ""XUSVR"" , ""DUEFL"" , ""AWSYS"" , ""TXKRS"" , 
  ""CTXKRS"" , ""LOTKZ"" , ""XWVOF"" , ""STGRD"" , ""PPNAM"" , ""PPDAT"" , ""PPTME"" , ""PPTCOD"" , ""BRNCH"" , ""NUMPG"" , ""ADISC"" , ""XREF1_HD"" , ""XREF2_HD"" , ""XREVERSAL"" , ""REINDAT"" , ""RLDNR"" , ""LDGRP"" , ""PROPMANO"" , ""XBLNR_ALT"" , ""VATDATE"" , ""FULFILLDATE"" , 
  ""DOCCAT"" , ""XSPLIT"" , ""CASH_ALLOC"" , ""FOLLOW_ON"" , ""XREORG"" , ""SUBSET"" , ""KURST"" , ""KURSX"" , ""KUR2X"" , ""KUR3X"" , ""XMCA"" , ""RESUBMISSION"" , ""LOGSYSTEM_SENDER"" , ""BUKRS_SENDER"" , ""BELNR_SENDER"" , ""GJAHR_SENDER"" , ""INTSUBID"" , ""AWORG_REV"" , ""AWREF_REV"" , 
  ""XREVERSING"" , ""XREVERSED"" , ""GLBTGRP"" , ""CO_VRGNG"" , ""CO_REFBT"" , ""CO_ALEBN"" , ""CO_VALDT"" , ""CO_BELNR_SENDER"" , ""KOKRS_SENDER"" , ""ACC_PRINCIPLE"" , ""_DATAAGING"" , ""TRAVA_PN"" , ""LDGRPSPEC_PN"" , ""AFABESPEC_PN"" , ""XSECONDARY"" , ""REPROCESSING_STATUS_CODE"" , 
  ""TRR_PARTIAL_IND"" , ""ITEM_REMOVAL_STATUS"" , ""PENRC"" , ""GLO_REF1_HD"" , ""GLO_DAT1_HD"" , ""GLO_REF2_HD"" , ""GLO_DAT2_HD"" , ""GLO_REF3_HD"" , ""GLO_DAT3_HD"" , ""GLO_REF4_HD"" , ""GLO_DAT4_HD"" , ""GLO_REF5_HD"" , ""GLO_DAT5_HD"" , ""GLO_BP1_HD"" , ""GLO_BP2_HD"" , ""EV_POSTNG_CTRL"" , 
  ""WHTDATE"" , ""CBTTYPE"" , ""CLOSINGSTEP"" , ""ANXTYPE"" , ""ANXAMNT"" , ""ANXPERC"" , ""ZVAT_INDC"" , ""/SAPF15/STATUS"" , ""PSOTY"" , ""PSOAK"" , ""PSOKS"" , ""PSOSG"" , ""PSOFN"" , ""INTFORM"" , ""INTDATE"" , ""PSOBT"" , ""PSOZL"" , ""PSODT"" , ""PSOTM"" , ""FM_UMART"" , ""CCINS"" , ""CCNUM"" , 
  ""SSBLK"" , ""BATCH"" , ""SNAME"" , ""SAMPLED"" , ""EXCLUDE_FLAG"" , ""BLIND"" , ""OFFSET_STATUS"" , ""OFFSET_REFER_DAT"" , ""KNUMV"" , ""BLO"" , ""CNT"" , ""PYBASTYP"" , ""PYBASNO"" , ""PYBASDAT"" , ""PYIBAN"" , ""INWARDNO_HD"" , ""INWARDDT_HD"" FROM ""BKPF"" WHERE ""MANDT"" = ? AND ""BUKRS"" = ? 
  AND ""BSTAT"" IN ( ? , ? , ? , ? , ? , ? , ? ) AND ( ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" 
  LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" 
  LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" 
  LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" 
  LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" 
  LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? OR ""AWKEY"" LIKE ? . . . 
  
  
  Thread Callstack :
  
  7261391820[thr=620887]: SqlExecutor at
     0: 0x00007fc9305517c0 in TRexUtils::WildcardPattern<TRexUtils::CESU8>::matchInternal2(char const*, unsigned long) const+0x40 at TRexUtils/Wildcard/WildcardPattern.cpp:661 (libhdbbasement.so)
     1: 0x00007fc93ba03fa2 in AttributeEngine::Delta::complex_iterator<AttributeEngine::BTree_Key<TrexTypes::StringAttributeValue> >::searchForSqlLike()+0x2f0 at AttributeEngine/Delta/DeltaContainerIterators.cpp:488 (libhdbcs.so)
     2: 0x00007fc939c4c4b4 in AttributeEngine::Delta::tree_iterator<TrexTypes::StringAttributeValue>::nextDataSet()+0x9ee0 at AttributeEngine/Delta/BTreeAttributeIterators.cpp:836 (libhdbcs.so)
     3: 0x00007fc939c5b642 in AttributeEngine::Delta::tree_iterator<TrexTypes::StringAttributeValue>::init(AttributeEngine::BTreeAttribute<TrexTypes::StringAttributeValue> const*, AttributeEngine::AttributeQuery const&,  . . . 
     4: 0x00007fc94392f507 in AttributeEngine::DeltaDictionaryScanHelper<TrexTypes::StringAttributeValue>::scan(ltt::integral_constant<bool, true>, AttributeEngine::BTreeAttribute<TrexTypes::StringAttributeValue> const&, AttributeEngine::Delta::SimpleGuardContainerRead const*, hex::Predicate const&, hex::GenerateFor, 
     5: 0x00007fc93bad1afb in AttributeEngine::DeltaDictionaryScanReader<TrexTypes::StringAttributeValue>::scan(hex::Predicate const&, hex::GenerateFor, ltt::memory_resource&, ltt::memory_resource&) const+0x47 at AttributeEngine/Delta/Hex/DeltaDictionaryScanReader.cpp:34 (libhdbcs.so)
     6: 0x00007fc91e9754e9 in hex::cs::PredicateDictScanOp::run(hex::RunContext) const+0x515 at hex/cs/table/PredicateDictScanOp.cpp:51 (libhdbhexcs.so)
     7: 0x00007fc932d25ec3 in hex::NoDataOperator::xf_run(hex::RunContext) const+0x10 at hex/core/planex/impl/OperatorImpl.cpp:153 (libhdbhexcore.so)
     8: 0x00007fc91e8a6f42 in hex::impl::NextPtr::run(hex::Operator const&, hex::RunContext) const+0x70 at hex/core/planex/impl/OperatorImpl.hpp:228 (libhdbhexcs.so)
     9: 0x00007fc91e95fa55 in hex::cs::FragmentScanInitOp::run(hex::RunContext) const+0xa1 at hex/core/planex/impl/OperatorImpl.hpp:389 (libhdbhexcs.so)
    10: 0x00007fc91e8a6f42 in hex::impl::NextPtr::run(hex::Operator const&, hex::RunContext) const+0x70 at hex/core/planex/impl/OperatorImpl.hpp:228 (libhdbhexcs.so)
    11: 0x00007fc91e99480e in hex::cs::TableScanInitScheduleOp::run(hex::RunContext) const+0x1ca at hex/core/planex/impl/OperatorImpl.hpp:389 (libhdbhexcs.so)
    12: 0x00007fc932d06ec8 in hex::OperatorGraph::runPipeline(unsigned int, hex::impl::LocalContext&) const+0x174 at hex/core/planex/build/OperatorGraph.hpp:252 (libhdbhexcore.so)
    13: 0x00007fc932d070af in hex::ExecutablePlan::open(hex::SelfOwningObjectHandle<hex::RuntimeParameters>, hex::FetchControl*) const+0xeb at hex/core/planex/build/OperatorGraph.hpp:263 (libhdbhexcore.so)
    14: 0x00007fc94c1fe4cd in ptime::Hex_search<(ptime::HexSearchType)0>::do_open(ptime::OperatorEnv&, ptime::QEParams, int) const+0x999 at ptime/query/plan_executor/dml/hex/qe_hex_search.cc:721 (libhdbrskernel.so)
  
   . . . .  
  

SAP HANA, Platform Edition 2.0

KBA , HAN-DB-ENG , SAP HANA DB Engines , HAN-DB-PERF , SAP HANA Database Performance , Problem