My application is running on Oracle Database which hosts 3 database instances. All of sudden one of my database instance is not running. when connected through sysdba it says "connected to idle instance". Here are the activities performed
Oracle version:Release 22.214.171.124.0
sudo su - oracle
sqlplus / AS SYSDBA
Connected to an idle instance.
ORA-01034: ORACLE not available
ORA-27101: shared memory realm does not exist Linux-x86_64 Error: 2: No such file or directory
ORA-01078: failure in processing system parameters
ORA-01565: error in identifying file '+DATADG/testdev1/spfiltestdev1.ora'
ORA-17503: ksfdopn:2 Failed to open file +DATADG/testdev1/spfiletestdev1.ora
ORA-29701: unable to connect to Cluster Synchronization Service
can anyone help me what is the issue ?