diff --git a/src/backend/utils/adt/misc.c b/src/backend/utils/adt/misc.c
index 5bda4af..5327447 100644
--- a/src/backend/utils/adt/misc.c
+++ b/src/backend/utils/adt/misc.c
@@ -33,6 +33,7 @@
 #include "storage/procarray.h"
 #include "utils/builtins.h"
 #include "tcop/tcopprot.h"
+#include "pgstat.h"
 
 #define atooid(x)  ((Oid) strtoul((x), NULL, 10))
 
@@ -75,9 +76,33 @@ static bool
 pg_signal_backend(int pid, int sig)
 {
 	if (!superuser())
-		ereport(ERROR,
-				(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
-			(errmsg("must be superuser to signal other server processes"))));
+	{
+        bool haveRight = false;
+        PgBackendStatus *backend;
+        
+		/* If the user not is the superuser, need to be the db owner. */
+		if (pg_database_ownercheck(MyDatabaseId, GetUserId())) {
+            
+            /* Check for the specify backend in the stat info table */
+            int nBackend = pgstat_fetch_stat_numbackends();
+            int i;
+            for (i = 1; i<=nBackend; ++i) {
+                backend = pgstat_fetch_stat_beentry(i);
+                if (backend->st_procpid == pid) {
+                    if (backend->st_databaseid == MyDatabaseId)
+                        haveRight = true;
+                    break;
+                }
+            }            
+        }
+
+        if (!haveRight)
+			ereport(ERROR,
+					(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
+				(errmsg("must be superuser or database destination owner to signal other server processes"))));
+	}
+
+
 
 	if (!IsBackendPid(pid))
 	{