diff --git a/manifest b/manifest
index 34a06e8e47..aabdb57ed0 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Make\ssure\sstatement\sjournals\sare\sinitiated\swhen\sdoing\sDROP\soperations\n(since\sthe\sDROP\smight\sfail\safter\ssqlite_master\schanges).\s\sAlso\smake\nsure\sstatement\sjournals\sare\sinitiated\sif\sthere\sare\spending\sSELECT\nstatements.\s\sTicket\s#2820.\s(CVS\s4591)
-D 2007-12-04T16:54:53
+C Add\sthe\sability\sto\schange\sthe\sautovacuum\sstatus\sof\san\sexisting\sdatabase\nby\ssetting\sthe\sauto_vacuum\spragma\sthen\srunning\sthe\sVACUUM\scommand.\s(CVS\s4592)
+D 2007-12-05T01:38:23
 F Makefile.arm-wince-mingw32ce-gcc ac5f7b2cef0cd850d6f755ba6ee4ab961b1fadf7
 F Makefile.in 30789bf70614bad659351660d76b8e533f3340e9
 F Makefile.linux-gcc d53183f4aa6a9192d249731c90dbdffbd2c68654
@@ -101,7 +101,7 @@ F src/journal.c 807bed7a158979ac8d63953e1774e8d85bff65e2
 F src/legacy.c 4ac53191fad2e3c4d59bde1228879b2dc5a96d66
 F src/limits.h 71ab25f17e35e0a9f3f6f234b8ed49cc56731d35
 F src/loadext.c 124e566563d1c03e68e1396cb44df9870612c6e9
-F src/main.c 994a6b6914d91dc6dea5012667ec0a52e74d3bca
+F src/main.c 53e71b4d4a0dbc1eb3a73520970973689cabea18
 F src/malloc.c 60e392a4c12c839517f9b0db7b995f825444fb35
 F src/md5.c c5fdfa5c2593eaee2e32a5ce6c6927c986eaf217
 F src/mem1.c 6d1a11864963d249c67e72ad5f6533b040333880
@@ -127,7 +127,7 @@ F src/os_win.h 41a946bea10f61c158ce8645e7646b29d44f122b
 F src/pager.c 65298fee4e815c269fb374d3fe3cd1cf4f05ad94
 F src/pager.h f504f7ae84060fee0416a853e368d3d113c3d6fa
 F src/parse.y a780b33ef45dd7b3272319cf91e609d6f109a31c
-F src/pragma.c cb1486e76dbcad757968afc4083d3472032e62b5
+F src/pragma.c 0246032dbe681dded8710ac43eaf654eead1434e
 F src/prepare.c f811fdb6fd4a82cca673a6e1d5b041d6caf567f1
 F src/printf.c 0d7ad185914c952bfa6235ac8f5f019db5ad37e5
 F src/random.c 4a22746501bf36b0a088c66e38dde5daba6a35da
@@ -136,7 +136,7 @@ F src/server.c 087b92a39d883e3fa113cae259d64e4c7438bc96
 F src/shell.c c97be281cfc3dcb14902f45e4b16f20038eb83ff
 F src/sqlite.h.in 28e78e9191a655fd2aa728c1f55d35e9f644103a
 F src/sqlite3ext.h a93f59cdee3638dc0c9c086f80df743a4e68c3cb
-F src/sqliteInt.h f5d5b5f0dcfcd2098131c57c08ece6e314e47697
+F src/sqliteInt.h a941ccf797b45c27bc0face4e75935b5cc019202
 F src/sqliteLimit.h 15ffe2116746c27ace2b428a26a4fcd6dba6fa65
 F src/table.c 1aeb9eab57b4235db86fe15a35dec76fb445a9c4
 F src/tclsqlite.c 9923abeffc9b3d7dad58e92b319661521f60debf
@@ -167,7 +167,7 @@ F src/trigger.c 66695e1375b969ea41a38dec9f40ea28bb0ac767
 F src/update.c 2add92a6159fa73128653706574afbcd8fd1dd80
 F src/utf.c ef4b7d83bae533b76c3e1bf635b113fdad86a736
 F src/util.c 05f31144bbd3f1a24f4139ae029c42545cb72624
-F src/vacuum.c a5e51c77370c1a6445e86d42abfc43867cdd482d
+F src/vacuum.c 25ffbd766f25bca099ead1c1e11f5528c86102b8
 F src/vdbe.c a99beac1162fa490c4b75ac36ed97146ab181837
 F src/vdbe.h 79e09ff13b85457abe437d9814454534ebbc1fe3
 F src/vdbeInt.h 630145b9bfaa19190ab491f52658a7db550f2247
@@ -496,7 +496,7 @@ F test/update.test 7669ca789d62c258b678e8aa7a22a57eac10f2cf
 F test/utf16.test 20e2d9ba0d57e952a18b1ac8deab9ad49e082893
 F test/utf16align.test 7360e84472095518c56746f76b1f9d4dce99fb4d
 F test/vacuum.test cf839fc3ff24d601057319bbb5c700ce9c8e0fb0
-F test/vacuum2.test e198d81a1cbc3f3f6b8aeee27cadfffea8995d42
+F test/vacuum2.test 5367c04e0968af617b29e51283498dff053d1115
 F test/varint.test ab7b110089a08b9926ed7390e7e97bdefeb74102
 F test/view.test 7e15fa1ba3267ddaa9ae96b6daf519f23f95b43e
 F test/vtab1.test 3573ad5045c44e8e2d2b6451122bcf2ee2a4f688
@@ -597,7 +597,7 @@ F www/tclsqlite.tcl 8be95ee6dba05eabcd27a9d91331c803f2ce2130
 F www/vdbe.tcl 87a31ace769f20d3627a64fa1fade7fed47b90d0
 F www/version3.tcl 890248cf7b70e60c383b0e84d77d5132b3ead42b
 F www/whentouse.tcl fc46eae081251c3c181bd79c5faef8195d7991a5
-P 7c2cf4542852a81daf29a930ab103c52bb678326
-R c111fb18ebb6378f510e950ea7f7ef09
+P bf34284ff0c60ae6e735e09bb29cd48b158e8dce
+R 268cf574fbaadd8f08b72bad36ab32de
 U drh
-Z 60a6d3adb97dfb253eaa60aa3a1f2c5c
+Z 01b4baedd2f51b7c9bd419e3c44b8fa2
diff --git a/manifest.uuid b/manifest.uuid
index d8421b89a6..acc41c0ef2 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-bf34284ff0c60ae6e735e09bb29cd48b158e8dce
\ No newline at end of file
+bdfc19e838b369a8c5d5d23663fad690f55ba3d7
\ No newline at end of file
diff --git a/src/main.c b/src/main.c
index a5b4d36bc2..515bd85eac 100644
--- a/src/main.c
+++ b/src/main.c
@@ -14,7 +14,7 @@
 ** other files are for internal use by SQLite and should not be
 ** accessed by users of the library.
 **
-** $Id: main.c,v 1.407 2007/10/12 19:35:49 drh Exp $
+** $Id: main.c,v 1.408 2007/12/05 01:38:23 drh Exp $
 */
 #include "sqliteInt.h"
 #include <ctype.h>
@@ -965,6 +965,7 @@ static int openDatabase(
   db->magic = SQLITE_MAGIC_BUSY;
   db->aDb = db->aDbStatic;
   db->autoCommit = 1;
+  db->nextAutovac = -1;
   db->flags |= SQLITE_ShortColNames
 #if SQLITE_DEFAULT_FILE_FORMAT<4
                  | SQLITE_LegacyFileFmt
diff --git a/src/pragma.c b/src/pragma.c
index 8f503218a0..6a53c0c5e9 100644
--- a/src/pragma.c
+++ b/src/pragma.c
@@ -11,7 +11,7 @@
 *************************************************************************
 ** This file contains code used to implement the PRAGMA command.
 **
-** $Id: pragma.c,v 1.150 2007/11/13 10:30:25 danielk1977 Exp $
+** $Id: pragma.c,v 1.151 2007/12/05 01:38:24 drh Exp $
 */
 #include "sqliteInt.h"
 #include <ctype.h>
@@ -440,6 +440,7 @@ void sqlite3Pragma(
       returnSingleInt(pParse, "auto_vacuum", auto_vacuum);
     }else{
       int eAuto = getAutoVacuum(zRight);
+      db->nextAutovac = eAuto;
       if( eAuto>=0 ){
         /* Call SetAutoVacuum() to set initialize the internal auto and
         ** incr-vacuum flags. This is required in case this connection
diff --git a/src/sqliteInt.h b/src/sqliteInt.h
index 3dadec3ce1..0576378c0e 100644
--- a/src/sqliteInt.h
+++ b/src/sqliteInt.h
@@ -11,7 +11,7 @@
 *************************************************************************
 ** Internal interface definitions for SQLite.
 **
-** @(#) $Id: sqliteInt.h,v 1.622 2007/11/29 17:05:18 danielk1977 Exp $
+** @(#) $Id: sqliteInt.h,v 1.623 2007/12/05 01:38:24 drh Exp $
 */
 #ifndef _SQLITEINT_H_
 #define _SQLITEINT_H_
@@ -481,6 +481,7 @@ struct sqlite3 {
   u8 autoCommit;                /* The auto-commit flag. */
   u8 temp_store;                /* 1: file 2: memory 0: default */
   u8 mallocFailed;              /* True if we have seen a malloc failure */
+  char nextAutovac;             /* Autovac setting after VACUUM if >=0 */
   int nTable;                   /* Number of tables in the database */
   CollSeq *pDfltColl;           /* The default collating sequence (BINARY) */
   i64 lastRowid;                /* ROWID of most recent insert (see above) */
diff --git a/src/vacuum.c b/src/vacuum.c
index ab56abd265..49e456c7ca 100644
--- a/src/vacuum.c
+++ b/src/vacuum.c
@@ -14,7 +14,7 @@
 ** Most of the code in this file may be omitted by defining the
 ** SQLITE_OMIT_VACUUM macro.
 **
-** $Id: vacuum.c,v 1.74 2007/10/20 20:58:57 drh Exp $
+** $Id: vacuum.c,v 1.75 2007/12/05 01:38:24 drh Exp $
 */
 #include "sqliteInt.h"
 #include "vdbeInt.h"
@@ -125,7 +125,8 @@ int sqlite3RunVacuum(char **pzErrMsg, sqlite3 *db){
   }
 
 #ifndef SQLITE_OMIT_AUTOVACUUM
-  sqlite3BtreeSetAutoVacuum(pTemp, sqlite3BtreeGetAutoVacuum(pMain));
+  sqlite3BtreeSetAutoVacuum(pTemp, db->nextAutovac>=0 ? db->nextAutovac :
+                                           sqlite3BtreeGetAutoVacuum(pMain));
 #endif
 
   /* Begin a transaction */
diff --git a/test/vacuum2.test b/test/vacuum2.test
index 5a6aca77b8..ad6762cb09 100644
--- a/test/vacuum2.test
+++ b/test/vacuum2.test
@@ -11,7 +11,7 @@
 # This file implements regression tests for SQLite library.  The
 # focus of this file is testing the VACUUM statement.
 #
-# $Id: vacuum2.test,v 1.3 2007/07/19 16:35:17 drh Exp $
+# $Id: vacuum2.test,v 1.4 2007/12/05 01:38:24 drh Exp $
 
 set testdir [file dirname $argv0]
 source $testdir/tester.tcl
@@ -57,4 +57,86 @@ do_test vacuum2-2.1 {
   hexio_get_int [hexio_read test.db 24 4]
 } [expr {[hexio_get_int [hexio_read test.db 24 4]]+1}]
 
+############################################################################
+# Verify that we can use the auto_vacuum pragma to request a new
+# autovacuum setting, do a VACUUM, and the new setting takes effect.
+# Make sure this happens correctly even if there are multiple open
+# connections to the same database file.
+#
+sqlite3 db2 test.db
+set pageSize [db eval {pragma page_size}]
+
+# Compute a checksum on the content of a database
+#
+proc cksum {{db db}} {
+  set sql "SELECT name, type, sql FROM sqlite_master ORDER BY name, type"
+  set txt [$db eval $sql]\n
+  set sql "SELECT name FROM sqlite_master WHERE type='table' ORDER BY name"
+  foreach tbl [$db eval $sql] {
+    append txt [$db eval "SELECT * FROM $tbl"]\n
+  }
+  foreach prag {default_cache_size} {
+    append txt $prag-[$db eval "PRAGMA $prag"]\n
+  }
+  set cksum [string length $txt]-[md5 $txt]
+  return $cksum
+}
+
+# We are currently not autovacuuming so the database should be 3 pages
+# in size.  1 page for each of sqlite_master, t1, and t2.
+#
+do_test vacuum2-3.1 {
+  execsql {
+    INSERT INTO t1 VALUES('hello');
+    INSERT INTO t2 VALUES('out there');
+  }
+  expr {[file size test.db]/$pageSize}
+} {3}
+set cksum [cksum]
+do_test vacuum2-3.2 {
+  cksum db2
+} $cksum
+
+# Convert the database to an autovacuumed database.
+do_test vacuum2-3.3 {
+  execsql {
+    PRAGMA auto_vacuum=FULL;
+    VACUUM;
+  }
+  expr {[file size test.db]/$pageSize}
+} {4}
+do_test vacuum2-3.4 {
+  cksum db2
+} $cksum
+do_test vacuum2-3.5 {
+  cksum
+} $cksum
+do_test vacuum2-3.6 {
+  execsql {PRAGMA integrity_check} db2
+} {ok}
+do_test vacuum2-3.7 {
+  execsql {PRAGMA integrity_check} db
+} {ok}
+
+# Convert the database back to a non-autovacuumed database.
+do_test vacuum2-3.13 {
+  execsql {
+    PRAGMA auto_vacuum=NONE;
+    VACUUM;
+  }
+  expr {[file size test.db]/$pageSize}
+} {3}
+do_test vacuum2-3.14 {
+  cksum db2
+} $cksum
+do_test vacuum2-3.15 {
+  cksum
+} $cksum
+do_test vacuum2-3.16 {
+  execsql {PRAGMA integrity_check} db2
+} {ok}
+do_test vacuum2-3.17 {
+  execsql {PRAGMA integrity_check} db
+} {ok}
+
 finish_test