sqlplus /NOLOG >conn sys / as sysdba sql> startupI get "ORA-01092. Oracle instance terminated. Disconnection forced." But if I give startup mount then the database is being mounted.
SHOW PARAMETER background_dump_destThis will return a directory. Look in that directory for a file titled alert_sid.log (where sid is your ORACLE_SID). The Alert Log will contain error messages indicating the exact reason why your instance won't open.
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