From 8cbd373ca7118aeb8b1d015f3a7a9520dd595959 Mon Sep 17 00:00:00 2001
From: drh <drh@noemail.net>
Date: Sat, 12 Feb 2005 00:19:30 +0000
Subject: [PATCH] Fix a problem with VACUUM that can lead to database
 corruption. (CVS 2323)

FossilOrigin-Name: 63894baf1b37156fd0b84eba4c9c5e8f43cee3f3
---
 manifest         | 16 +++++++--------
 manifest.uuid    |  2 +-
 src/vacuum.c     | 33 +++++++++++++++++++------------
 test/vacuum.test | 51 ++++++++++++++++++++++++++++++++++++++++++++++--
 4 files changed, 79 insertions(+), 23 deletions(-)

diff --git a/manifest b/manifest
index a477ae587a..6b971df142 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Return\sSQLITE_BUSY\sif\sthe\sdatabase\sis\slocked\sreading\sthe\sschema\swithin\r\nsqlite_prepare().\sTicket\s#1106.\s(CVS\s2322)
-D 2005-02-09T07:05:46
+C Fix\sa\sproblem\swith\sVACUUM\sthat\scan\slead\sto\sdatabase\scorruption.\s(CVS\s2323)
+D 2005-02-12T00:19:30
 F Makefile.in d928187101fa3d78426cf48ca30e39d0fb714e57
 F Makefile.linux-gcc a9e5a0d309fa7c38e7c14d3ecf7690879d3a5457
 F README a01693e454a00cc117967e3f9fdab2d4d52e9bc1
@@ -73,7 +73,7 @@ F src/trigger.c 038c8e128d4551cd016426cd11bbf5c478816481
 F src/update.c b6f4668c11059f86b71581187d09197fa28ec4be
 F src/utf.c bda5eb85039ef16f2d17004c1e18c96e1ab0a80c
 F src/util.c 1b7b9a127b66743ab6cba8d44597aeb570723c99
-F src/vacuum.c 4dbe45a5c41674a04ac45a7586031583386ab119
+F src/vacuum.c ccb34e92fd662b2d975e3c8d8cfd229c9081cb78
 F src/vdbe.c d9ec62c9f63768b4d4f8513b25aded8faf2de17b
 F src/vdbe.h bb9186484f749a839c6c43953e79a6530253f7cd
 F src/vdbeInt.h e80721cd8ff611789e20743eec43363a9fb5a48e
@@ -204,7 +204,7 @@ F test/types2.test 81dd1897be8ef4b5b73d0006e6076abe40610de3
 F test/unique.test 0e38d4cc7affeef2527720d1dafd1f6870f02f2b
 F test/update.test 7669ca789d62c258b678e8aa7a22a57eac10f2cf
 F test/utf16.test 459c2f5ab80c60092c603630a348c32d6e59c558
-F test/vacuum.test 10204524354ff5947e056419fa6b4f4b5067a541
+F test/vacuum.test 76c4bc4589353d071e81c003a25338d02560474d
 F test/varint.test ab7b110089a08b9926ed7390e7e97bdefeb74102
 F test/view.test 306cc4342eb03c28de1a92c681836189e03e5af9
 F test/where.test ffb790dfda75d977bae7a1f5830351623f76861b
@@ -270,7 +270,7 @@ F www/tclsqlite.tcl e73f8f8e5f20e8277619433f7970060ab01088fc
 F www/vdbe.tcl 095f106d93875c94b47367384ebc870517431618
 F www/version3.tcl 092a01f5ef430d2c4acc0ae558d74c4bb89638a0
 F www/whentouse.tcl 3e522a06ad41992023c80ca29a048ae2331ca5bd
-P f73a8aa34afd39e0b7df8f22b5c5d2c8d8979a1b
-R f830539fd533897542bbb8d2a19a23a0
-U danielk1977
-Z 0245bb834a1cf0f9358bd0fb2bd64ab5
+P c33c02d6069b90f295698a9f35f4aa99dee5f5e9
+R 8e61ab153be1dc618b065882d6b2d1a5
+U drh
+Z ed61c7e978da07a018272bafaa9d7f6b
diff --git a/manifest.uuid b/manifest.uuid
index b6d55f184c..77e3d9dcc6 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-c33c02d6069b90f295698a9f35f4aa99dee5f5e9
\ No newline at end of file
+63894baf1b37156fd0b84eba4c9c5e8f43cee3f3
\ No newline at end of file
diff --git a/src/vacuum.c b/src/vacuum.c
index bcd5c07d9d..4444195bad 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 1.38 2005/02/05 12:48:48 danielk1977 Exp $
+** $Id: vacuum.c,v 1.39 2005/02/12 00:19:30 drh Exp $
 */
 #include "sqliteInt.h"
 #include "os.h"
@@ -244,22 +244,31 @@ int sqlite3RunVacuum(char **pzErrMsg, sqlite3 *db){
   */
   if( sqlite3BtreeIsInTrans(pTemp) ){
     u32 meta;
+    int i;
+
+    /* This array determines which meta meta values are preserved in the
+    ** vacuum.  Even entries are the meta value number and odd entries
+    ** are an increment to apply to the meta value after the vacuum.
+    ** The increment is used to increase the schema cookie so that other
+    ** connections to the same database will know to reread the schema.
+    */
+    static const unsigned char aCopy[] = {
+       1, 1,    /* Add one to the old schema cookie */
+       3, 0,    /* Preserve the default page cache size */
+       5, 0,    /* Preserve the default text encoding */
+       6, 0,    /* Preserve the user version */
+    };
 
     assert( 0==sqlite3BtreeIsInTrans(pMain) );
     rc = sqlite3BtreeBeginTrans(pMain, 1);
     if( rc!=SQLITE_OK ) goto end_of_vacuum;
 
-    /* Copy Btree meta values 3 and 4. These correspond to SQL layer meta 
-    ** values 2 and 3, the default values of a couple of pragmas.
-    */
-    rc = sqlite3BtreeGetMeta(pMain, 3, &meta);
-    if( rc!=SQLITE_OK ) goto end_of_vacuum;
-    rc = sqlite3BtreeUpdateMeta(pTemp, 3, meta);
-    if( rc!=SQLITE_OK ) goto end_of_vacuum;
-    rc = sqlite3BtreeGetMeta(pMain, 4, &meta);
-    if( rc!=SQLITE_OK ) goto end_of_vacuum;
-    rc = sqlite3BtreeUpdateMeta(pTemp, 4, meta);
-    if( rc!=SQLITE_OK ) goto end_of_vacuum;
+    /* Copy Btree meta values */
+    for(i=0; i<sizeof(aCopy)/sizeof(aCopy[0]); i+=2){
+      rc = sqlite3BtreeGetMeta(pMain, aCopy[i], &meta);
+      if( rc!=SQLITE_OK ) goto end_of_vacuum;
+      rc = sqlite3BtreeUpdateMeta(pTemp, aCopy[i], meta+aCopy[i+1]);
+    }
 
     rc = sqlite3BtreeCopyFile(pMain, pTemp);
     if( rc!=SQLITE_OK ) goto end_of_vacuum;
diff --git a/test/vacuum.test b/test/vacuum.test
index 782f9a49e8..5ba851710b 100644
--- a/test/vacuum.test
+++ b/test/vacuum.test
@@ -11,7 +11,7 @@
 # This file implements regression tests for SQLite library.  The
 # focus of this file is testing the VACUUM statement.
 #
-# $Id: vacuum.test,v 1.33 2005/02/03 01:08:20 drh Exp $
+# $Id: vacuum.test,v 1.34 2005/02/12 00:19:30 drh Exp $
 
 set testdir [file dirname $argv0]
 source $testdir/tester.tcl
@@ -153,6 +153,52 @@ do_test vacuum-2.4 {
   cksum db2
 } $cksum
 
+# Make sure the schema cookie is incremented by vacuum.
+#
+do_test vacuum-2.5 {
+  execsql {
+    BEGIN;
+    CREATE TABLE t6 AS SELECT * FROM t1;
+    CREATE TABLE t7 AS SELECT * FROM t1;
+    COMMIT;
+  }
+  sqlite3 db3 test.db
+  execsql {
+    SELECT * FROM t7 LIMIT 1
+  } db3
+  execsql {
+    VACUUM;
+  }
+  execsql {
+    INSERT INTO t7 VALUES(1234567890,'hello','world');
+  } db3
+  execsql {
+    SELECT * FROM t7 WHERE a=1234567890
+  }
+} {1234567890 hello world}
+integrity_check vacuum-2.6
+do_test vacuum-2.7 {
+  execsql {
+    SELECT * FROM t7 WHERE a=1234567890
+  } db3
+} {1234567890 hello world}
+do_test vacuum-2.8 {
+  execsql {
+    INSERT INTO t7 SELECT * FROM t6;
+    SELECT count(*) FROM t7;
+  }
+} 513
+integrity_check vacuum-2.9
+do_test vacuum-2.10 {
+  execsql {
+    DELETE FROM t7;
+    SELECT count(*) FROM t7;
+  } db3
+} 0
+integrity_check vacuum-2.11
+db3 close
+ 
+
 # Ticket #427.  Make sure VACUUM works when the EMPTY_RESULT_CALLBACKS
 # pragma is turned on.
 #
@@ -302,4 +348,5 @@ ifcapable {autoinc} {
   } $::cksum
 }
 
-# finish_test
+
+finish_test