2621085 - SAP MaxDB/liveCache does not start - shared memory object - Permission denied

Start of SAP MaxDB database fails with the following symptoms:

The SAP MaxDB log:

/sapdb/<SID>/data/wrk/<SID>/dbm.prt  (database version 7.7 and above)

or

/sapdb/data/wrk/<SID>/dbm.prt (database version lower than 7.7)

writes:

<date and time>      22368 INF        283 DBMSrv   Command 'db_online' is being executed.

<date and time>      22368 ERR     -24994 DBMSrv   ERR_RTE: Runtime environment error

                     22368 INF          0 DBMSrv   20090,Check knldiag! Kernel exited with '1' before reaching ADMIN state

                     22368 INF          0 DBMSrv   The database is in state "offline", but resources were found: pid file found but no watchdog process

<date and time>      22368 ERR     -24580 DBMSrv   ERR_COMMAND_FAILED: Command 'db_online' has ended and failed with return code -24994.

The SAP MaxDB log:

/sapdb/<SID>/data/wrk/<SID>/KnlMsg (database version 7.7 and above)

or

/sapdb/data/wrk/<SID>/knldiag (database version lower than 7.7)

writes:

<date and time>   WNG RTE       16804:  Unlink shared memory object /SDBTech-KSS-SHM-<SID> failed: rc: Permission denied

or

<date and time>   ERR RTE       16013:  Create shared memory object /SDBTech-KSS-SHM-<SID> failed: rc: Permission denied

Note that KnlMsg is written in XML format.
To convert KnlMsg to readable format use command:

/sapdb/programs/bin/protconv -p /sapdb/<SID>/data/wrk/<SID>/KnlMsg -o /sapdb/<SID>/data/wrk/<SID>/KnlMsg.txt

SAP MaxDB based products on Linux platform:

- SAP MaxDB database for SAP systems

- SAP liveCache (SCM systems)

- SAP Content Server

Shared memory, permission , KBA , BC-DB-SDB , MaxDB , BC-DB-LVC , liveCache , BC-OP-LNX , Linux , Problem