TAILIEUCHUNG - Oracle Database 2 Day DBA 11g Release- P11

Oracle Database 2 Day DBA 11g Release- P11:Oracle Database 2 Day DBA is a database administration quick start guide that teaches you how to perform day-to-day database administrative tasks. The goal of this guide is to help you understand the concepts behind Oracle Database. It teaches you how to perform all common administrative tasks needed to keep the database operational, including how to perform basic troubleshooting and performance monitoring activities. | Proactive Database Monitoring This is the average number of active sessions waiting for user I O. User I O means that the workload originating from the user causes the database to read data from disk or write data to disk. Click the User I O link to go to the Performance page to view potential problems inside and outside the database. CPU This is the average active sessions using CPU. Click the CPU link to see a chart showing more detailed information about active sessions over time. 6. View the Diagnostic Summary section which includes the following information ADDM Findings This shows the count of ADDM findings from the most recent ADDM run. Click the number adjacent to the ADDM Findings link to go to the ADDM page. Period Start Time This is the start time of the time period most recently analyzed by ADDM. It is shown only if there are ADDM findings. Alert Log This is the timestamp of the most recent alert log entry that describes an ORA-error. Click the Alert Log link to go to the Alert Log Errors page which shows a list of log entries that contain errors. Active Incidents This shows the count of active incidents which are occurrences of critical errors in the database. You are encouraged to investigate critical errors and report them to Oracle Support Services. Click the count to go to the Support Workbench home page. Database Instance Health Click Database Instance Health to display the Database Instance Health page which includes graphical timelines of incidents ADDM findings and alerts. You can use these graphs for identifying correlations between incidents and alerts generated and performance issues on the system. 7. View the SQL Response Time section. This is the current response time of a tracked set of SQL statements as compared to the response time for the reference collection. A reference collection or SQL Tuning Set is set of SQL statements that represents the typical SQL workload on your production system. If the current response time and reference .

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