📝 lsnrctl status – Always verify listener is up before connecting.
Introduction to Oracle Database architecture, accessing an instance, and starting up/shutting down the database. Database Creation Creating databases using Database Configuration Assistant (DBCA) or manual SQL commands. Connectivity 📝 lsnrctl status – Always verify listener is
SELECT session_id, sql_id, wait_class, event, time_waited FROM v$active_session_history WHERE sample_time > SYSDATE - (10/1440); accessing an instance
| Component | Description | 19c Specifics | |-----------|-------------|----------------| | | System Global Area (shared memory) + Program Global Area (private memory) | In-Memory Column Store (optional) | | Processes | Background, user, and server processes | More automatic processes (e.g., space advisor) | | Storage | Data files, control files, redo logs, parameter file | Multitenant architecture (CDB/PDB) | SYSDATE - (10/1440)