diff -ru postgresql-7.4.6.orig/src/backend/commands/vacuum.c postgresql-7.4.6/src/backend/commands/vacuum.c
--- postgresql-7.4.6.orig/src/backend/commands/vacuum.c	2003-10-03 08:19:44.000000000 +0900
+++ postgresql-7.4.6/src/backend/commands/vacuum.c	2005-02-28 20:19:55.000000000 +0900
@@ -743,6 +743,12 @@
 	Oid			toast_relid;
 	bool		result;
 
+	if ( vacstmt->range )
+		elog(NOTICE, "vacuum_rel(): range %ld...%ld",
+			 vacstmt->range->start, vacstmt->range->end);
+	else
+		elog(NOTICE, "vacuum_rel(): no range.");
+
 	/* Begin a transaction for vacuuming this relation */
 	StartTransactionCommand();
 	SetQuerySnapshot();			/* might be needed for functions in
diff -ru postgresql-7.4.6.orig/src/backend/commands/vacuumlazy.c postgresql-7.4.6/src/backend/commands/vacuumlazy.c
--- postgresql-7.4.6.orig/src/backend/commands/vacuumlazy.c	2003-09-25 15:57:59.000000000 +0900
+++ postgresql-7.4.6/src/backend/commands/vacuumlazy.c	2005-02-28 20:26:08.000000000 +0900
@@ -91,7 +91,8 @@
 
 /* non-export function prototypes */
 static void lazy_scan_heap(Relation onerel, LVRelStats *vacrelstats,
-			   Relation *Irel, int nindexes);
+			   Relation *Irel, int nindexes,
+			   BlockNumber startBlock, BlockNumber endBlock);
 static void lazy_vacuum_heap(Relation onerel, LVRelStats *vacrelstats);
 static void lazy_scan_index(Relation indrel, LVRelStats *vacrelstats);
 static void lazy_vacuum_index(Relation indrel, LVRelStats *vacrelstats);
@@ -149,7 +150,12 @@
 	hasindex = (nindexes > 0);
 
 	/* Do the vacuuming */
-	lazy_scan_heap(onerel, vacrelstats, Irel, nindexes);
+	if ( vacstmt->range )
+		lazy_scan_heap(onerel, vacrelstats, Irel, nindexes,
+					   vacstmt->range->start, vacstmt->range->end);
+	else
+		lazy_scan_heap(onerel, vacrelstats, Irel, nindexes,
+					   0, RelationGetNumberOfBlocks(onerel));
 
 	/* Done with indexes */
 	vac_close_indexes(nindexes, Irel);
@@ -184,7 +190,8 @@
  */
 static void
 lazy_scan_heap(Relation onerel, LVRelStats *vacrelstats,
-			   Relation *Irel, int nindexes)
+			   Relation *Irel, int nindexes,
+			   BlockNumber startBlock, BlockNumber endBlock)
 {
 	BlockNumber nblocks,
 				blkno;
@@ -209,13 +216,20 @@
 	empty_pages = 0;
 	num_tuples = tups_vacuumed = nkeep = nunused = 0;
 
-	nblocks = RelationGetNumberOfBlocks(onerel);
+//	nblocks = RelationGetNumberOfBlocks(onerel);
+	if ( endBlock < RelationGetNumberOfBlocks(onerel) )
+		nblocks = endBlock;
+	else
+		nblocks = RelationGetNumberOfBlocks(onerel);
+
 	vacrelstats->rel_pages = nblocks;
 	vacrelstats->nonempty_pages = 0;
 
 	lazy_space_alloc(vacrelstats, nblocks);
 
-	for (blkno = 0; blkno < nblocks; blkno++)
+	elog(NOTICE, "lazy_vacuum_heap: range %d...%d", startBlock, nblocks);
+
+	for (blkno = startBlock; blkno < nblocks; blkno++)
 	{
 		Buffer		buf;
 		Page		page;
diff -ru postgresql-7.4.6.orig/src/backend/parser/gram.y postgresql-7.4.6/src/backend/parser/gram.y
--- postgresql-7.4.6.orig/src/backend/parser/gram.y	2003-11-25 01:54:15.000000000 +0900
+++ postgresql-7.4.6/src/backend/parser/gram.y	2005-02-28 20:19:17.000000000 +0900
@@ -3981,6 +3981,7 @@
 					n->freeze = $3;
 					n->verbose = $4;
 					n->relation = NULL;
+					n->range = NULL;
 					n->va_cols = NIL;
 					$$ = (Node *)n;
 				}
@@ -3993,6 +3994,22 @@
 					n->freeze = $3;
 					n->verbose = $4;
 					n->relation = $5;
+					n->range = NULL;
+					n->va_cols = NIL;
+					$$ = (Node *)n;
+				}
+			| VACUUM opt_full opt_freeze opt_verbose qualified_name '(' Iconst ',' Iconst ')'
+				{
+					VacuumStmt *n = makeNode(VacuumStmt);
+					n->vacuum = true;
+					n->analyze = false;
+					n->full = $2;
+					n->freeze = $3;
+					n->verbose = $4;
+					n->relation = $5;
+					n->range = makeNode(VacuumRange);
+					n->range->start = $7;
+					n->range->end   = $9;
 					n->va_cols = NIL;
 					$$ = (Node *)n;
 				}
@@ -4003,6 +4020,7 @@
 					n->full = $2;
 					n->freeze = $3;
 					n->verbose |= $4;
+					n->range = NULL;
 					$$ = (Node *)n;
 				}
 		;
@@ -4017,6 +4035,7 @@
 					n->freeze = false;
 					n->verbose = $2;
 					n->relation = NULL;
+					n->range = NULL;
 					n->va_cols = NIL;
 					$$ = (Node *)n;
 				}
@@ -4029,6 +4048,7 @@
 					n->freeze = false;
 					n->verbose = $2;
 					n->relation = $3;
+					n->range = NULL;
 					n->va_cols = $4;
 					$$ = (Node *)n;
 				}
diff -ru postgresql-7.4.6.orig/src/include/nodes/nodes.h postgresql-7.4.6/src/include/nodes/nodes.h
--- postgresql-7.4.6.orig/src/include/nodes/nodes.h	2003-08-18 04:58:06.000000000 +0900
+++ postgresql-7.4.6/src/include/nodes/nodes.h	2005-02-28 19:16:39.000000000 +0900
@@ -223,6 +223,7 @@
 	T_CreatedbStmt,
 	T_DropdbStmt,
 	T_VacuumStmt,
+	T_VacuumRange,
 	T_ExplainStmt,
 	T_CreateSeqStmt,
 	T_AlterSeqStmt,
postgresql-7.4.6/src/include/nodesだけに発見: nodes.h~
diff -ru postgresql-7.4.6.orig/src/include/nodes/parsenodes.h postgresql-7.4.6/src/include/nodes/parsenodes.h
--- postgresql-7.4.6.orig/src/include/nodes/parsenodes.h	2003-09-17 13:25:29.000000000 +0900
+++ postgresql-7.4.6/src/include/nodes/parsenodes.h	2005-02-28 19:48:36.000000000 +0900
@@ -1507,6 +1507,13 @@
 	char	   *indexname;		/* original index defined */
 } ClusterStmt;
 
+typedef struct VacuumRange
+{
+	NodeTag		type;
+	long		start;
+	long		end;
+} VacuumRange;
+
 /* ----------------------
  *		Vacuum and Analyze Statements
  *
@@ -1523,6 +1530,7 @@
 	bool		freeze;			/* early-freeze option */
 	bool		verbose;		/* print progress info */
 	RangeVar   *relation;		/* single table to process, or NULL */
+	VacuumRange *range;
 	List	   *va_cols;		/* list of column names, or NIL for all */
 } VacuumStmt;