https://www.oraclescripts.com/tags/adr/Recent content in ADR on Oracle ScriptsHugo -- gohugo.ioenOracleScripts.comMon, 03 Aug 2026 00:00:00 +0000https://www.oraclescripts.com/post/locate-alert-log-and-trace-files-with-vdiag-info/Mon, 03 Aug 2026 00:00:00 +0000https://www.oraclescripts.com/post/locate-alert-log-and-trace-files-with-vdiag-info/ <h2 id="locate-the-alert-log-and-trace-files-with-vdiag_info">Locate the Alert Log and Trace Files with V$DIAG_INFO</h2> <h2 id="purpose">Purpose</h2> <p>Before Oracle 11g, finding the alert log meant knowing the value of <code>BACKGROUND_DUMP_DEST</code> and constructing the filename by hand. 11g replaced that parameter, along with <code>USER_DUMP_DEST</code> and <code>CORE_DUMP_DEST</code>, with a single <code>DIAGNOSTIC_DEST</code> parameter and moved every trace file, alert log, incident package, and core dump under the Automatic Diagnostic Repository (ADR) — a structured directory tree rooted at <code>DIAGNOSTIC_DEST</code> and organized by database name and instance name underneath it. That consolidation is a net improvement, but it introduces a new problem: a DBA connecting to an unfamiliar instance, a freshly handed-off production system, or a database with a non-default <code>DIAGNOSTIC_DEST</code> has no reliable way to guess the alert log's path from memory. Grepping the filesystem for <code>alert_*.log</code> works until the mount point is unfamiliar, the ORACLE_HOME is shared across several instances, or shell access isn't available at all.</p>