1z0084 Oracle Database 19c: Performance Management and Tuning Free Practice Test — 30 Questions

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During a critical peak sales period, an Oracle Database 19c system supporting an e-commerce platform experiences severe performance degradation. Users report intermittent \"Connection Timeout\" errors. Monitoring reveals that sessions are frequently waiting on the `db file sequential read` event, and metrics show a substantial increase in both `physical reads` and `db block gets` within `V$SYSTEM_EVENT`. Which of the following diagnostic and tuning approaches would be the most effective initial step to pinpoint the root cause and guide corrective actions?

Initiate a comprehensive analysis using Automatic Workload Repository (AWR) reports and Automatic Database Diagnostic Monitor (ADDM) to identify specific SQL statements or structural deficiencies contributing to the high sequential read I/O.
Increase the `DB_CACHE_SIZE` parameter significantly to enhance the buffer cache's ability to hold more data blocks in memory, thereby reducing physical disk reads.
Provision additional CPU cores for the database server to handle the increased workload and alleviate potential CPU contention.
Adjust the `LOG_BUFFER` parameter to a larger value to improve the efficiency of redo log writes during high transaction volumes.

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