Oracle Performance

Enable a 10046 Trace for an Oracle Session Purpose A 10046 trace returns wait events only if the level includes them. Enabling the trace at level 1 and then wondering why the file shows no waits is the most common 10046 mistake in production diagnosis — the output has elapsed times and call counts, but none of the db …

Check RESUMABLE_TIMEOUT and RESUMABLE Status in V$SESSION Purpose V$SESSION carries two columns that tell you whether a session can survive running out of space: RESUMABLE and the resumable timeout that governs it. When resumable space allocation is enabled, a statement that hits a space error — a full tablespace, a …

Monitor PGA Aggregate Target with V$PGASTAT in Oracle Purpose Is PGA_AGGREGATE_TARGET set high enough for the work the instance actually does? V$PGASTAT answers that question. It is the instance-level statistics view for the Program Global Area — the private memory Oracle hands to each server process for sorting, …

How to Change Oracle AWR Snapshot Interval to 30 Minutes using dbms_workload_repository.modify_snapshot_settings Purpose The Oracle Database Automatic Workload Repository (AWR) collects and stores performance statistics to help database administrators monitor and analyze database performance over time. The code …

How to Monitor Oracle Shared Pool Usage with V$SGASTAT Database Administrators (DBAs) frequently need to track memory allocation inside Oracle’s SGA (System Global Area), especially within the Shared Pool. Monitoring the shared pool helps identify memory fragmentation, excessive parsing, and potential memory-related …