Connections to Oracle DB server gets timed out with 'EAGAIN (Resource temporarily unavailable)' errors

Solution In Progress - Updated -

Issue

  • We have 12 application servers creating 500 TCP connections to the single Oracle RAC DB server (total ~6000 connections). The TCP connection to DB server is failing periodically, the strace logs shows that TCP connection to server is failing with below errors:

    $ strace -p 32120 |grep -i "Resource temporarily unavailable"
[...]
474   <... futex resumed> )             = -1 EAGAIN (Resource temporarily unavailable)
932   <... futex resumed> )             = -1 EAGAIN (Resource temporarily unavailable)
32461 <... futex resumed> )             = -1 EAGAIN (Resource temporarily unavailable)
32462 <... futex resumed> )             = -1 EAGAIN (Resource temporarily unavailable)
32466 <... futex resumed> )             = -1 EAGAIN (Resource temporarily unavailable)
32466 <... futex resumed> )             = -1 EAGAIN (Resource temporarily unavailable)
32461 <... futex resumed> )             = -1 EAGAIN (Resource temporarily unavailable)

  • There were no messages observed on console or in /var/log/messages file when TCP connections were timed out.

Environment

  • Red Hat Enterprise Linux 6.3
  • Oracle RAC DB server
  • Client systems creating large number of TCP connections to DB server (~ 6000 connections)

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