2026-03-12 20:23:15

tpt/comments/library_cache_lock.txt

@@ -0,0 +1,14 @@
+If the BLOCKING_SESSION isn't working well enough for you or doesn't exist in your DB version, then
+you can use X$KGLLK directly to find sessions blocking/with interest in your lock
+
+1) V$SESSION_WAIT.PARAMETER1 is the lib cache object handle we are trying to lock (@sw.sql)
+
+  -> V$EVENT_NAME PARAMETER1 shows that ( @sed "library cache lock" )
+
+2) Query X$KGLLK by matching X$KGLLK.KGLHDADR to V$SESSION_WAIT.PARAMETER1
+
+  -> find the "holder" sid
+
+3) Use sw, snapper on the SID holding the lock to see what its doing
+
+