V$active_session_history
Query Historical ASH Beyond Memory with DBA_HIST_ACTIVE_SESS_HISTORY
Oct 7, 2026 / · 11 min read · Oracle DBA Active Session History AWR Retention ASH Sampling Oracle Performance dba_hist_active_sess_history v$active_session_history dbms_workload_repository ·Query Historical ASH Beyond Memory with DBA_HIST_ACTIVE_SESS_HISTORY Purpose Troubleshooting a performance spike after the fact is a different job than watching one happen live. By the time anyone opens a session the next morning to ask what was running during last night's batch window, the in-memory …
Read MoreWatch Long-Running SQL in Real Time with V$SQL_MONITOR
Watch Long-Running SQL in Real Time with V$SQL_MONITOR Purpose An AWR report describes what happened over the last hour. A SQL trace file describes what happened after the statement has already finished writing it. V$SQL_MONITOR answers a different question: what is running right now, and how far along is it. …
Read MoreOracle ASH Report: Generate with ashrpt.sql
Oct 3, 2025 / · 6 min read · Oracle Database Performance Tuning ASH Reports Database Monitoring SQL Scripts Diagnostics AWR Session Analysis V$ACTIVE_SESSION_HISTORY ·Generate Active Session History ASH Report in Oracle Database The Active Session History (ASH) report is a powerful diagnostic tool that helps database administrators analyze performance issues by capturing detailed snapshots of active database sessions every second. This report provides granular insights into what …
Read MoreOracle Time Model Queries: v$sys_time_model Monitoring
Oracle Time Model Queries: System and Session Performance Monitoring Purpose Oracle time model queries provide database administrators with powerful tools to measure and analyze where time is spent within the database system. These queries use two essential dynamic performance views that track accumulated time for …
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