alter tablespace xxx begin backup;	
		alter database begin backup;

static void
heap_xlog_insert(XLogReaderState *record)
{
	XLogRecPtr	lsn = record->EndRecPtr;
	xl_heap_insert *xlrec = (xl_heap_insert *) XLogRecGetData(record);
	Buffer		buffer;
	Page		page;
	union
	{
		HeapTupleHeaderData hdr;
		char		data[MaxHeapTupleSize];
	}			tbuf;
	HeapTupleHeader htup;
	xl_heap_header xlhdr;
	uint32		newlen;
	Size		freespace = 0;
	RelFileNode target_node;
	BlockNumber blkno;
	ItemPointerData target_tid;
	XLogRedoAction action;

	XLogRecGetBlockTag(record, 0, &target_node, NULL, &blkno);
	ItemPointerSetBlockNumber(&target_tid, blkno);
	ItemPointerSetOffsetNumber(&target_tid, xlrec->offnum);

	/*
	 * The visibility map may need to be fixed even if the heap page is
	 * already up-to-date.
	 */
	if (xlrec->flags & XLH_INSERT_ALL_VISIBLE_CLEARED)
	{
		Relation	reln = CreateFakeRelcacheEntry(target_node);
		Buffer		vmbuffer = InvalidBuffer;

		visibilitymap_pin(reln, blkno, &vmbuffer);
		visibilitymap_clear(reln, blkno, vmbuffer, VISIBILITYMAP_VALID_BITS);
		ReleaseBuffer(vmbuffer);
		FreeFakeRelcacheEntry(reln);
	}

	/*
	 * If we inserted the first and only tuple on the page, re-initialize the
	 * page from scratch.
	 */
	if (XLogRecGetInfo(record) & XLOG_HEAP_INIT_PAGE)
	{
		buffer = XLogInitBufferForRedo(record, 0);
		page = BufferGetPage(buffer);
		PageInit(page, BufferGetPageSize(buffer), 0);
		action = BLK_NEEDS_REDO;
	}
	else
		action = XLogReadBufferForRedo(record, 0, &buffer);
	if (action == BLK_NEEDS_REDO)
	{
		Size		datalen;
		char	   *data;

		page = BufferGetPage(buffer);

		if (PageGetMaxOffsetNumber(page) + 1 < xlrec->offnum)
			elog(PANIC, "invalid max offset number");

		data = XLogRecGetBlockData(record, 0, &datalen);

		newlen = datalen - SizeOfHeapHeader;
		Assert(datalen > SizeOfHeapHeader && newlen <= MaxHeapTupleSize);
		memcpy((char *) &xlhdr, data, SizeOfHeapHeader);
		data += SizeOfHeapHeader;

		htup = &tbuf.hdr;
		MemSet((char *) htup, 0, SizeofHeapTupleHeader);
		/* PG73FORMAT: get bitmap [+ padding] [+ oid] + data */
		memcpy((char *) htup + SizeofHeapTupleHeader,
			   data,
			   newlen);
		newlen += SizeofHeapTupleHeader;
		htup->t_infomask2 = xlhdr.t_infomask2;
		htup->t_infomask = xlhdr.t_infomask;
		htup->t_hoff = xlhdr.t_hoff;
		HeapTupleHeaderSetXmin(htup, XLogRecGetXid(record));
		HeapTupleHeaderSetCmin(htup, FirstCommandId);
		htup->t_ctid = target_tid;

		if (PageAddItem(page, (Item) htup, newlen, xlrec->offnum,
						true, true) == InvalidOffsetNumber)
			elog(PANIC, "failed to add tuple");

		freespace = PageGetHeapFreeSpace(page); /* needed to update FSM below */

		PageSetLSN(page, lsn);

		if (xlrec->flags & XLH_INSERT_ALL_VISIBLE_CLEARED)
			PageClearAllVisible(page);

		/* XLH_INSERT_ALL_FROZEN_SET implies that all tuples are visible */
		if (xlrec->flags & XLH_INSERT_ALL_FROZEN_SET)
			PageSetAllVisible(page);

		MarkBufferDirty(buffer);
	}
	if (BufferIsValid(buffer))
		UnlockReleaseBuffer(buffer);

	/*
	 * If the page is running low on free space, update the FSM as well.
	 * Arbitrarily, our definition of "low" is less than 20%. We can't do much
	 * better than that without knowing the fill-factor for the table.
	 *
	 * XXX: Don't do this if the page was restored from full page image. We
	 * don't bother to update the FSM in that case, it doesn't need to be
	 * totally accurate anyway.
	 */
	if (action == BLK_NEEDS_REDO && freespace < BLCKSZ / 5)
		XLogRecordPageWithFreeSpace(target_node, blkno, freespace);
}

/*
 * Handles MULTI_INSERT record type.
 */
static void