diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 32e19c5..0be658f 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -402,6 +402,7 @@ static void ATExecSetTableSpace(Oid tableOid, Oid newTableSpace, LOCKMODE lockmo
 static void ATExecSetRelOptions(Relation rel, List *defList,
 					AlterTableType operation,
 					LOCKMODE lockmode);
+static LOCKMODE GetRelOptionsLockLevel(List *defList);
 static void ATExecEnableDisableTrigger(Relation rel, char *trigname,
 					   char fires_when, bool skip_system, LOCKMODE lockmode);
 static void ATExecEnableDisableRule(Relation rel, char *rulename,
@@ -2783,6 +2784,39 @@ AlterTableInternal(Oid relid, List *cmds, bool recurse)
 }
 
 /*
+ * GetRelOptionsLockLevel
+ *
+ * Return AccessShareLock if all reloptions is related to autovacuum
+ * else return AccessExclusiveLock.
+ *
+ */
+LOCKMODE
+GetRelOptionsLockLevel(List *defList)
+{
+	LOCKMODE	lockmode;
+	ListCell	*cell;
+
+	if (defList == NIL)
+		return NoLock;
+
+	foreach(cell, defList)
+	{
+		DefElem	*def = (DefElem *) lfirst(cell);
+
+		/* relax lock for autovacuum reloptions */
+		if (pg_strncasecmp("autovacuum_", def->defname, 11) == 0)
+			lockmode = AccessShareLock;
+		else
+		{
+			lockmode = AccessExclusiveLock;
+			break;
+		}
+	}
+
+	return lockmode;
+}
+
+/*
  * AlterTableGetLockLevel
  *
  * Sets the overall lock level required for the supplied list of subcommands.
@@ -3028,7 +3062,7 @@ AlterTableGetLockLevel(List *cmds)
 										 * getTables() */
 			case AT_ResetRelOptions:	/* Uses MVCC in getIndexes() and
 										 * getTables() */
-				cmd_lockmode = AccessExclusiveLock;
+				cmd_lockmode = GetRelOptionsLockLevel((List *) cmd->def);
 				break;
 
 			default:			/* oops */