LI72569: WHEN USING CONNECTION CONCENTRATOR AND OVERFLOW CONNECTIONS OCCUR, THE CALCULATED NUMBER OF DISPATCHERS MAYBE TOO LOW

DB2 Version 9.1 Fix Pack 7  for Linux, UNIX and Windows
DB2 Version 9.1 Fix Pack 5   for Linux, UNIX and Windows
DB2 Version 9.1 Fix Pack 6   for Linux, UNIX and Windows
DB2 Version 9.1 Fix Pack 6a for Linux, UNIX and Windows
DB2 Version 9.1 Fix Pack 7a  for Linux, UNIX and Windows
DB2 Version 9.1 Fix Pack 8  for Linux, UNIX and Windows
DB2 Version 9.1 Fix Pack 9  for Linux, UNIX and Windows
DB2 Version 9.1 Fix Pack 10  for Linux, UNIX and Windows
DB2 Version 9.1 Fix Pack 11  for Linux, UNIX and Windows
DB2 Version 9.1 Fix Pack 12  for Linux, UNIX and Windows

APAR status

• Closed as program error.

Error description

• When using connection concentrator and overflow connections
  occur, the calculated number of dispatchers maybe too low.
  
  
  The problem can be observed by the following db2diag.log entry:
  
  2007-09-03-06.17.38.133364-240 I2308129E308       LEVEL: Severe
  PID     : 31577                TID  : 183041501440PROC :
  db2tcpcm 0
  INSTANCE: db2inst1             NODE : 000
  FUNCTION: DB2 UDB, base sys utilities,
  sqeDomainSocketManager::GetDispatcherSoc, probe:10
  RETCODE : ZRC=0x00000000=0=PSM_OK "Unknown"
  
  
  And assoicated function calls in the stack:
       sqle_panic
       sqeDomainSocketManager::GetDispatcherSocketPair
       sqeConnQueue
       sqeConnQueue::sqeConnQueue
       sqeConnDispatcher
       sqeConnDispatcher::sqeConnDispatcher
       sqeConcentrator::GetDispatcher
       sqeConcentrator::RegisterConcUnknownConn
       sqeConcentrator::XferConnToConcentrator
       sqleGetAgent
  

Local fix

• Increase MAX_CONNECTIONS to prevent overflow connections from
  being used.
  

Problem summary

• When using connection concentrator and overflow connections
  occur, the calculated number of dispatchers maybe too low.
  
  
  The problem can be observed by the following db2diag.log entry:
  
  2007-09-03-06.17.38.133364-240 I2308129E308       LEVEL: Severe
  PID     : 31577                TID  : 183041501440PROC :
  db2tcpcm 0
  INSTANCE: db2inst1             NODE : 000
  FUNCTION: DB2 UDB, base sys utilities,
  sqeDomainSocketManager::GetDispatcherSoc, probe:10
  RETCODE : ZRC=0x00000000=0=PSM_OK "Unknown"
  
  
  And assoicated function calls in the stack:
       sqle_panic
       sqeDomainSocketManager::GetDispatcherSocketPair
       sqeConnQueue
       sqeConnQueue::sqeConnQueue
       sqeConnDispatcher
       sqeConnDispatcher::sqeConnDispatcher
       sqeConcentrator::GetDispatcher
       sqeConcentrator::RegisterConcUnknownConn
       sqeConcentrator::XferConnToConcentrator
       sqleGetAgent
  

Problem conclusion

• First fixed in DB2 UDB Version 9.1, FixPak 5 (s080512).
  

Temporary fix

• Increase MAX_CONNECTIONS to prevent overflow connections from
  being used.
  

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

  LI72652 LI72687

Fix information

• Fixed component name

  DB2 UDE ESE LIN

• Fixed component ID

  5765F4104

Applicable component levels

• R810 PSN

     UP

• R820 PSN

     UP

• R910 PSN

     UP

• R950 PSN

     UP