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How to start oracle data monitoring
Steps to start data listener in oracle: Check current status: lsnrctl status Start: lsnrctl start Enable automatic start: lsnrctl set auto_start true Verify startup status: lsnrctl status Check log file (/u01/app/oracle/product//server/ tnsnames.ora) for error messages. This topic provides you with relevant articles, downloads, and course content for you to download and experience for free.
How to start oracle data monitoringSteps to start a data listener in Oracle: Check the current status: lsnrctl status Start: lsnrctl start Enable automatic start: lsnrctl set auto_start true Verify the startup status: lsnrctl status Check the log file (/u01/app/oracle/product//server/tnsnames.ora) for error messages. 
How to query data in oracle databaseMethods to use SQL to query data in Oracle database: use the "sqlplus" command to connect to the database; execute the "SELECT" statement and specify the columns and tables to be extracted; optional: use "ORDER BY", "LIMIT" and functions to evaluate the results Sort, limit and manipulate.
How to query oracle instance nameYou can query the Oracle instance name using the following methods: Through SQL Plus: SELECT INSTANCE_NAME FROM V$INSTANCE; Through SQL Developer: View the "Service Properties" tab in the "Connection" node; Through SID Preboot: SELECT INSTANCE_NAME FROM V$INSTANCE; Through tnsnames.ora file; through the Oracle Net configuration file.
How to check database instance name in oracleHow to query the Oracle Database instance name: Use SQL*Plus to connect and run the query: select name from v$instance; Navigate to "Database Instance" through Oracle Enterprise Manager (OEM) and view "Properties"; Check the environment variables: % in Windows ORACLE_SID%, $ORACLE_SID in Linux/Unix.
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