Clusterware startup sequence for Oracle 11g R2
Understanding how the clusterware startup occurs is critical to the diagnosis and resolution of Oracle RAC problems.
In Unix and Linux operating systems, there is a master daemon process named INIT
that functions to start up additional system background processes. The INIT
process first spawns the init.ohasd
process, which in turn starts up the Oracle High Availability Services Daemon (OHASD). In turn, the OHASD daemon then spawns additional Clusterware processes at each startup level as shown next:
- Level 1—OHASD spawns:
Cssdagent
: Agent responsible for spawning CSSDOrarootagent
: Agent responsible for managing all root-owned ohasd resourcesOraagent
: Agent responsible for managing all Oracle-owned ...
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