commit 5aa717be9fe7288cbec043cdea0fb757433f3462
Author:     Alvaro Herrera <alvherre@alvh.no-ip.org>
AuthorDate: Wed Dec 26 15:12:44 2018 -0300
CommitDate: Wed Dec 26 15:12:45 2018 -0300

    Improve autovacuum logic about temp tables nearing XID wraparound

diff --git a/src/backend/postmaster/autovacuum.c b/src/backend/postmaster/autovacuum.c
index c18285d690..62a06add56 100644
--- a/src/backend/postmaster/autovacuum.c
+++ b/src/backend/postmaster/autovacuum.c
@@ -2108,11 +2108,18 @@ do_autovacuum(void)
 		if (classForm->relpersistence == RELPERSISTENCE_TEMP)
 		{
 			int			backendID;
+			PGPROC	   *proc;
 
 			backendID = GetTempNamespaceBackendId(classForm->relnamespace);
 
-			/* We just ignore it if the owning backend is still active */
-			if (backendID == MyBackendId || BackendIdGetProc(backendID) == NULL)
+			/*
+			 * We just ignore it if the owning backend is still active in the
+			 * same database.
+			 */
+			if (backendID != InvalidBackendId &&
+				(backendID == MyBackendId ||
+				 (proc = BackendIdGetProc(backendID)) == NULL ||
+				 proc->databaseId != MyDatabaseId))
 			{
 				/*
 				 * We found an orphan temp table (which was probably left