Connecting to database says "Connected to an idle instance" while database is running.

Solution Verified - Updated -

Issue

  • Oracle database server crash during the night after system upgrade
  • connecting to database says "Connected to an idle instance" while database is running
  • Any sql executed or statedump fails with Oracle errors:
    ORA-01034, ORA-27123, Linux errno 22
  • Orcale logs contains error messages like
    ORA-27123: unable to attach to shared memory segment
    kkjcre1p: unable to spawn jobq slave process
  • sysrev shows "instance not alive"

Environment

  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Oracle Database - Enterprise Edition - Version 11.2.0.3 and later
  • Large Oracle Shared Global Area (SGA) - mostly above 207 GB
  • prelink is enabled

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