Initial implementation of concurrent VACUUM. Ifdef'd out for the moment,

because index locking issues are not handled correctly yet.  Need to go
work on the index AMs next.

src/backend/commands/Makefile

@@ -4,7 +4,7 @@
 #    Makefile for commands
 #
 # IDENTIFICATION
-#    $Header: /cvsroot/pgsql/src/backend/commands/Makefile,v 1.26 2000/08/31 16:09:53 petere Exp $
+#    $Header: /cvsroot/pgsql/src/backend/commands/Makefile,v 1.27 2001/07/13 22:55:59 tgl Exp $
 #
 #-------------------------------------------------------------------------
 
@@ -13,7 +13,7 @@ top_builddir = ../../..
 include $(top_builddir)/src/Makefile.global
 
 OBJS = async.o creatinh.o command.o comment.o copy.o indexcmds.o define.o \
-       remove.o rename.o vacuum.o analyze.o view.o cluster.o \
+       remove.o rename.o vacuum.o vacuumlazy.o analyze.o view.o cluster.o \
        explain.o sequence.o trigger.o user.o proclang.o \
        dbcommands.o variable.o
 

src/include/commands/vacuum.h

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Id: vacuum.h,v 1.37 2001/07/12 04:11:13 tgl Exp $
+ * $Id: vacuum.h,v 1.38 2001/07/13 22:55:59 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -24,7 +24,7 @@
 #endif
 
 #include "nodes/parsenodes.h"
-#include "storage/block.h"
+#include "utils/rel.h"
 
 
 /* State structure for vac_init_rusage/vac_show_rusage */
@@ -37,6 +37,9 @@ typedef struct VacRUsage
 
 /* in commands/vacuum.c */
 extern void vacuum(VacuumStmt *vacstmt);
+extern void vac_open_indexes(Relation relation, int *nindexes,
+							 Relation **Irel);
+extern void vac_close_indexes(int nindexes, Relation *Irel);
 extern void vac_update_relstats(Oid relid,
 								BlockNumber num_pages,
 								double num_tuples,
@@ -44,6 +47,9 @@ extern void vac_update_relstats(Oid relid,
 extern void vac_init_rusage(VacRUsage *ru0);
 extern const char *vac_show_rusage(VacRUsage *ru0);
 
+/* in commands/vacuumlazy.c */
+extern void lazy_vacuum_rel(Relation onerel, VacuumStmt *vacstmt);
+
 /* in commands/analyze.c */
 extern void analyze_rel(Oid relid, VacuumStmt *vacstmt);