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Many Connections From oraagent.bin to ASM or Database Instance (Likely ORA-00020) (Doc ID 1287496.1)

Last updated on MARCH 04, 2019

Applies to:

Oracle Database - Enterprise Edition - Version to [Release 11.2]
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Information in this document applies to any platform.


11gR2 Grid Infrastructure, observed many connections from oraagent.bin to ASM or database instance, v$session.program shows many " (TNS V1-V3)" sessions, and "ps -ef| grep beq" shows many processes:

oracle     823     1  0 Mar20 ?        00:00:00 oracle+ASM21 (DESCRIPTION=(LOCAL=YES)(ADDRESS=(PROTOCOL=beq)))

Process state dump shows similar like the following:

Call stack:<-ntpfprd<-nsbasic_brc<-nsbrecv<-nioqrc..

      O/S info: user: oracle, term: , ospid: 21686
      machine: program: (TNS V1-V3)
      application name: (TNS V1-V3), hash value=12120032
    Current Wait Stack:
     0: waiting for 'SQL*Net message from client'
        driver id=0x62657100, #bytes=0x1, =0x0
        wait_id=103 seq_num=106 snap_id=1
        wait times: snap=21706 min 32 sec, exc=21706 min 32 sec, total=21706 min 32 sec

Eventually ORA-00020 will happen  as oraagent.bin keeps making new connections without closing them:

ORA-00020: maximum number of processes (nn) exceeded

Once it happens, other instance may fail to restart as no new connection can be made to the ORA-00020 instance:

SQL> startup
ORA-03113: end-of-file on communication channel

Errors in file $TRACE/+ASM12_lck0_9071.trc  (incident=233838):
ORA-00600: internal error code, arguments: [1617], [30], [1], [], [], [], [], [], [], [], [], []
Incident details in: $INCIDENT/+ASM12_lck0_9071_i233838.trc
LCK0 (ospid: 9071): terminating the instance due to error 480

Trace shows call stack of: .. kgeasi ksbmsg ksbedcic_one_int ksbedcic_one kclabs ..

The ORA-00600 [1617] error will go away once the ORA-00020 instance is restarted (it could mean a restart of Grid Infrastructure  if OCR/VD is on ASM and ASM is getting ORA-00020)




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