In the life of an Oracle Database Expert, It usually early morning when the monitoring alert fired. Typically 3 AM in then morning, applications throwing ORA-04031, Developers calling and the on-call DBA logged in to find the shared pool exhausted — Oracle unable to allocate a single new object in memory. No new SQL could Read more about ORA-04031: Shared Pool Exhaustion — Root Cause and Fix[…]
In Post -2 of this series, We had a vector search query running clean in development — ten milliseconds, HNSW index in the plan, results looking right. The moment the same query hit a table with eight million rows in staging, response time jumped to forty seconds. The execution plan had quietly switched to TABLE Read more about Vector Indexes in Oracle AI Database 26ai — How HNSW and IVF Work Under the Hood[…]
Introduction Have you ever been asked to explain why your Oracle database was slow last Tuesday at 2:30 PM? Or needed to identify which SQL statements were causing CPU spikes during last night’s batch run? This is where DBA_HIST_ACTIVE_SESS_HISTORY becomes your most powerful diagnostic tool. Recently, we faced a production issue where users reported intermittent Read more about DBA_HIST_ACTIVE_SESS_HISTORY: Complete Guide to Oracle ASH Analysis[…]