https://www.oraclescripts.com/tags/lsof/Recent content in Lsof on Oracle ScriptsHugo -- gohugo.ioenOracleScripts.comTue, 28 Apr 2026 00:00:00 +0000https://www.oraclescripts.com/post/lsof-find-files-opened-by-process-oracle/Tue, 28 Apr 2026 00:00:00 +0000https://www.oraclescripts.com/post/lsof-find-files-opened-by-process-oracle/ <h2 id="list-files-opened-by-an-oracle-process-with-lsof--p">List Files Opened by an Oracle Process with lsof -p</h2> <h2 id="purpose">Purpose</h2> <p><code>lsof</code> (LiSt Open Files) is the UNIX tool for inspecting which processes have which files open. For an Oracle DBA it is the fastest answer to four common questions: which datafiles is this server process touching, which trace file is <code>PMON</code> writing into right now, why is <code>df</code> reporting more space used than <code>du</code>, and which library is the database currently mapped against. The one-liner below — taken straight from the shutdownabort.com DBA Quick Guides (Andrew Barry, 2007–2013, preserved via the Wayback Machine as the anchor source for this post) — is the smallest possible invocation: list every file held open by one process, identified by its PID.</p>