diff --git a/manifest b/manifest
index 1d9d6b99fc..6b8e64b6d0 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Add\s<stddef.h>\sto\ssqliteInt.h.\s(CVS\s2262)
-D 2005-01-21T21:31:41
+C Add\sthe\sexperimental\ssqlite3_expired()\sAPI.\s(CVS\s2263)
+D 2005-01-22T03:03:54
 F Makefile.in ffd81f5e926d40b457071b4de8d7c1fa18f39b5a
 F Makefile.linux-gcc a9e5a0d309fa7c38e7c14d3ecf7690879d3a5457
 F README a01693e454a00cc117967e3f9fdab2d4d52e9bc1
@@ -28,7 +28,7 @@ F sqlite3.1 01fdb467ce387a83248857c92f9e801df9e4611c
 F sqlite3.def dbaeb20c153e1d366e8f421b55a573f5dfc00863
 F sqlite3.pc.in 985b9bf34192a549d7d370e0f0b6b34a4f61369a
 F src/attach.c cecf5ab42cff34416372a0210b14abb50ed48ef9
-F src/auth.c 3b81f2a42f48a62c2c9c9b0eda31a157c681edea
+F src/auth.c 4b15c85335417752cc1045eae18b8186e08c8184
 F src/btree.c e68ae12c8b12ef9d45d58d931c36c184055a3880
 F src/btree.h 74d19cf40ab49fd69abe9e4e12a6c321ad86c497
 F src/build.c b60b1f1f48521fe5b4bf98a189cadc205b2e8065
@@ -55,16 +55,16 @@ F src/os_win.h 41a946bea10f61c158ce8645e7646b29d44f122b
 F src/pager.c 49ee879e0a0b06e6dcdb30f601c1bf4ac68bf028
 F src/pager.h 9eba8c53dd91eae7f3f90743b2ee242da02a9862
 F src/parse.y 5f2c197fcb63c6aed1787da436ec5a35247ab7a4
-F src/pragma.c 8ab313986673aa4c45e8693d8aabb9b95ee7b14a
+F src/pragma.c 141a3f4985b76035d102dc7ca37be6b04cfb8376
 F src/printf.c 3d20b21cfecadacecac3fb7274e746cb81d3d357
 F src/random.c eff68e3f257e05e81eae6c4d50a51eb88beb4ff3
 F src/select.c e204ca5292751ed889f2cbcf2d2808a4d29edd2c
 F src/shell.c 591364a0e9ca4ce53873e21e0294476c0c2b4770
-F src/sqlite.h.in 8249b697d71ef6d7f7f752ba4ca04058e9e8b5ff
-F src/sqliteInt.h a6c82164e99c91d6e5a2ef6ddd65ea33b6952115
+F src/sqlite.h.in 7d7c28344e2bd770491b56ed9169be20859c707d
+F src/sqliteInt.h be6fa5e31c65e2b8e10112ee47a6e63ec7de37b5
 F src/table.c 25b3ff2b39b7d87e8d4a5da0713d68dfc06cbee9
 F src/tclsqlite.c fd27457b228118be96524dae285146c76efe032b
-F src/test1.c 35c055c934ea9797d1b8ca7083ced6a9b263f2ec
+F src/test1.c 0a71a150659dd261be775c5eb60ae6c0c856c8a5
 F src/test2.c bbc2ecc58ceeab12d1e40970f831b1017524e40d
 F src/test3.c 683e1e3819152ffd35da2f201e507228921148d0
 F src/test4.c 7c6b9fc33dd1f3f93c7f1ee6e5e6d016afa6c1df
@@ -77,9 +77,9 @@ F src/util.c a858b93ba06bbafab55ba41e4d58538eb51f4b6a
 F src/vacuum.c 1a9db113a027461daaf44724c71dd1ebbd064203
 F src/vdbe.c a5db9e8c1a7482a865d49ded5947ecbd97bee6f8
 F src/vdbe.h 067ca8d6750ba4f69a50284765e5883dee860181
-F src/vdbeInt.h f2b5f54d9881bbc89fff02d95f3f825ade68bce2
-F src/vdbeapi.c 0cf3bdc1072616bedc8eec7fc22e3f5a169d33fd
-F src/vdbeaux.c d01eff904aa38fcea738998845b736ec1a3b1f7c
+F src/vdbeInt.h 24d411de9efc6919a1e580069a597182be269bcf
+F src/vdbeapi.c 7b65522152c36104e1ab83057ce6f7b880755b16
+F src/vdbeaux.c fcadffa683dce3213190411676576823a65656d2
 F src/vdbemem.c 62fe89471b656a922e9879be005abf690509ead3
 F src/where.c f4127cc2633ee0f74790ab7f09f5af832489e44e
 F tclinstaller.tcl 36478c3bbfc5b93ceac42d94e3c736937b808432
@@ -105,7 +105,7 @@ F test/btree5.test 8e5ff32c02e685d36516c6499add9375fe1377f2
 F test/btree6.test a5ede6bfbbb2ec8b27e62813612c0f28e8f3e027
 F test/btree7.test a6d3b842db22af97dd14b989e90a2fd96066b72f
 F test/capi2.test b0e12aa66684424869f899b421ff71df69411998
-F test/capi3.test ffb8bd785d5fe26e5d63f24c189c45f21297d44f
+F test/capi3.test 607c90dd85b357c412f064a882f197528695ab34
 F test/capi3b.test 5b6a66f9f295f79f443b5d3f33187fa5ef6cf336
 F test/collate1.test f79736d2ebf5492167ee4d1f4ab4c09dda776b03
 F test/collate2.test 224a632ba04907c049804b08162efd234aa7871f
@@ -271,7 +271,7 @@ F www/tclsqlite.tcl e73f8f8e5f20e8277619433f7970060ab01088fc
 F www/vdbe.tcl 095f106d93875c94b47367384ebc870517431618
 F www/version3.tcl 092a01f5ef430d2c4acc0ae558d74c4bb89638a0
 F www/whentouse.tcl 3e522a06ad41992023c80ca29a048ae2331ca5bd
-P 2ddb6748751c0135a42e6d0bcc303d06d8e17cf3
-R bfba4ab05fda7100e094155588bf4cd1
+P fede252d19cce6a88f6baff3362b057ab3b8af4b
+R f63a0d547a129b500c164681f97b8ec5
 U drh
-Z 2e36c59f27869824e11595c5813b0bca
+Z 57c27b4a6f46b9df6f843f9dba7ad549
diff --git a/manifest.uuid b/manifest.uuid
index bda111052d..2d2ee005c8 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-fede252d19cce6a88f6baff3362b057ab3b8af4b
\ No newline at end of file
+df648d50c0696cf7ada2fe5973d285b494891964
\ No newline at end of file
diff --git a/src/auth.c b/src/auth.c
index 17f1df9bb6..6aa69c8747 100644
--- a/src/auth.c
+++ b/src/auth.c
@@ -14,7 +14,7 @@
 ** systems that do not need this facility may omit it by recompiling
 ** the library with -DSQLITE_OMIT_AUTHORIZATION=1
 **
-** $Id: auth.c,v 1.19 2004/09/30 13:43:13 drh Exp $
+** $Id: auth.c,v 1.20 2005/01/22 03:03:54 drh Exp $
 */
 #include "sqliteInt.h"
 
@@ -76,6 +76,7 @@ int sqlite3_set_authorizer(
 ){
   db->xAuth = xAuth;
   db->pAuthArg = pArg;
+  sqlite3ExpirePreparedStatements(db);
   return SQLITE_OK;
 }
 
diff --git a/src/pragma.c b/src/pragma.c
index eac505b936..890cc39bf8 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 1.84 2005/01/20 11:32:24 danielk1977 Exp $
+** $Id: pragma.c,v 1.85 2005/01/22 03:03:54 drh Exp $
 */
 #include "sqliteInt.h"
 #include "os.h"
@@ -160,10 +160,13 @@ static int flagPragma(Parse *pParse, const char *zLeft, const char *zRight){
         if( v ){
           returnSingleInt(pParse, p->zName, (db->flags & p->mask)!=0 );
         }
-      }else if( getBoolean(zRight) ){
-        db->flags |= p->mask;
       }else{
-        db->flags &= ~p->mask;
+        if( getBoolean(zRight) ){
+          db->flags |= p->mask;
+        }else{
+          db->flags &= ~p->mask;
+        }
+        sqlite3ExpirePreparedStatements(db);
       }
       return 1;
     }
diff --git a/src/sqlite.h.in b/src/sqlite.h.in
index 7aa05c7862..77a4f11ef5 100644
--- a/src/sqlite.h.in
+++ b/src/sqlite.h.in
@@ -12,7 +12,7 @@
 ** This header file defines the interface that the SQLite library
 ** presents to client programs.
 **
-** @(#) $Id: sqlite.h.in,v 1.127 2005/01/20 01:14:23 danielk1977 Exp $
+** @(#) $Id: sqlite.h.in,v 1.128 2005/01/22 03:03:54 drh Exp $
 */
 #ifndef _SQLITE3_H_
 #define _SQLITE3_H_
@@ -1174,6 +1174,18 @@ int sqlite3_rekey(
 */
 int sqlite3_sleep(int);
 
+/*
+** Return TRUE (non-zero) of the statement supplied as an argument needs
+** to be recompiled.  A statement needs to be recompiled whenever the
+** execution environment changes in a way that would alter the program
+** that sqlite3_prepare() generates.  For example, if new functions or
+** collating sequences are registered or if an authorizer function is
+** added or changed.
+**
+******* THIS IS AN EXPERIMENTAL API AND IS SUBJECT TO CHANGE ******
+*/
+int sqlite3_expired(sqlite3_stmt*);
+
 /*
 ** If the following global variable is made to point to a
 ** string which is the name of a directory, then all temporary files
diff --git a/src/sqliteInt.h b/src/sqliteInt.h
index fc1f91f42e..4f95805a97 100644
--- a/src/sqliteInt.h
+++ b/src/sqliteInt.h
@@ -11,7 +11,7 @@
 *************************************************************************
 ** Internal interface definitions for SQLite.
 **
-** @(#) $Id: sqliteInt.h,v 1.362 2005/01/21 21:31:41 drh Exp $
+** @(#) $Id: sqliteInt.h,v 1.363 2005/01/22 03:03:55 drh Exp $
 */
 #ifndef _SQLITEINT_H_
 #define _SQLITEINT_H_
@@ -1572,6 +1572,7 @@ void sqlite3Reindex(Parse*, Token*, Token*);
 void sqlite3AlterRenameTable(Parse*, SrcList*, Token*);
 int sqlite3GetToken(const unsigned char *, int *);
 void sqlite3NestedParse(Parse*, const char*, ...);
+void sqlite3ExpirePreparedStatements(sqlite3*);
 
 #ifndef SQLITE_OMIT_CURSOR
 void sqlite3CursorDelete(SqlCursor*);
diff --git a/src/test1.c b/src/test1.c
index 0601e89b83..c751861a89 100644
--- a/src/test1.c
+++ b/src/test1.c
@@ -13,7 +13,7 @@
 ** is not included in the SQLite library.  It is used for automated
 ** testing of the SQLite library.
 **
-** $Id: test1.c,v 1.126 2005/01/21 11:55:27 danielk1977 Exp $
+** $Id: test1.c,v 1.127 2005/01/22 03:03:55 drh Exp $
 */
 #include "sqliteInt.h"
 #include "tcl.h"
@@ -949,6 +949,28 @@ static int test_reset(
   return TCL_OK;
 }
 
+/*
+** Usage:  sqlite3_expired STMT 
+**
+** Return TRUE if a recompilation of the statement is recommended.
+*/
+static int test_expired(
+  void * clientData,
+  Tcl_Interp *interp,
+  int objc,
+  Tcl_Obj *CONST objv[]
+){
+  sqlite3_stmt *pStmt;
+  if( objc!=2 ){
+    Tcl_AppendResult(interp, "wrong # args: should be \"",
+        Tcl_GetStringFromObj(objv[0], 0), " <STMT>", 0);
+    return TCL_ERROR;
+  }
+  if( getStmtPointer(interp, Tcl_GetString(objv[1]), &pStmt) ) return TCL_ERROR;
+  Tcl_SetObjResult(interp, Tcl_NewBooleanObj(sqlite3_expired(pStmt)));
+  return TCL_OK;
+}
+
 /*
 ** Usage:  sqlite3_changes DB
 **
@@ -2848,6 +2870,7 @@ int Sqlitetest1_Init(Tcl_Interp *interp){
      { "sqlite3_prepare16",             test_prepare16     ,0 },
      { "sqlite3_finalize",              test_finalize      ,0 },
      { "sqlite3_reset",                 test_reset         ,0 },
+     { "sqlite3_expired",               test_expired       ,0 },
      { "sqlite3_changes",               test_changes       ,0 },
      { "sqlite3_step",                  test_step          ,0 },
 
diff --git a/src/vdbeInt.h b/src/vdbeInt.h
index e15a421079..da64f762d0 100644
--- a/src/vdbeInt.h
+++ b/src/vdbeInt.h
@@ -342,6 +342,7 @@ struct Vdbe {
   u8 explain;             /* True if EXPLAIN present on SQL command */
   u8 changeCntOn;         /* True to update the change-counter */
   u8 aborted;             /* True if ROLLBACK in another VM causes an abort */
+  u8 expired;             /* True if the VM needs to be recompiled */
   int nChange;            /* Number of db changes made since last reset */
 };
 
diff --git a/src/vdbeapi.c b/src/vdbeapi.c
index 02751959f2..348925a71e 100644
--- a/src/vdbeapi.c
+++ b/src/vdbeapi.c
@@ -16,6 +16,21 @@
 #include "sqliteInt.h"
 #include "vdbeInt.h"
 
+/*
+** Return TRUE (non-zero) of the statement supplied as an argument needs
+** to be recompiled.  A statement needs to be recompiled whenever the
+** execution environment changes in a way that would alter the program
+** that sqlite3_prepare() generates.  For example, if new functions or
+** collating sequences are registered or if an authorizer function is
+** added or changed.
+**
+***** EXPERIMENTAL ******
+*/
+int sqlite3_expired(sqlite3_stmt *pStmt){
+  Vdbe *p = (Vdbe*)pStmt;
+  return p==0 || p->expired;
+}
+
 /**************************** sqlite3_value_  *******************************
 ** The following routines extract information from a Mem or sqlite3_value
 ** structure.
diff --git a/src/vdbeaux.c b/src/vdbeaux.c
index a78f099155..4044c2fd30 100644
--- a/src/vdbeaux.c
+++ b/src/vdbeaux.c
@@ -1805,3 +1805,20 @@ void sqlite3VdbeSetChanges(sqlite3 *db, int nChange){
 void sqlite3VdbeCountChanges(Vdbe *v){
   v->changeCntOn = 1;
 }
+
+/*
+** Mark every prepared statement associated with a database connection
+** as expired.
+**
+** An expired statement means that recompilation of the statement is
+** recommend.  Statements expire when things happen that make their
+** programs obsolete.  Removing user-defined functions or collating
+** sequences, or changing an authorization function are the types of
+** things that make prepared statements obsolete.
+*/
+void sqlite3ExpirePreparedStatements(sqlite3 *db){
+  Vdbe *p;
+  for(p = db->pVdbe; p; p=p->pNext){
+    p->expired = 1;
+  }
+}
diff --git a/test/capi3.test b/test/capi3.test
index 81b087f79a..2e551d40c6 100644
--- a/test/capi3.test
+++ b/test/capi3.test
@@ -11,7 +11,7 @@
 # This file implements regression tests for SQLite library.  The
 # focus of this script testing the callback-free C/C++ API.
 #
-# $Id: capi3.test,v 1.27 2005/01/20 01:14:23 danielk1977 Exp $
+# $Id: capi3.test,v 1.28 2005/01/22 03:03:55 drh Exp $
 #
 
 set testdir [file dirname $argv0]
@@ -430,6 +430,13 @@ check_header $STMT capi3-5.1 {a b c} {VARINT BLOB VARCHAR(16)}
 do_test capi3-5.2 {
   sqlite3_step $STMT
 } SQLITE_ROW
+do_test capi3-5.2.1 {
+  sqlite3_expired $STMT
+} {0}
+do_test capi3-5.2.2 {
+  db auth {}
+  sqlite3_expired $STMT
+} {1}
 
 check_header $STMT capi3-5.3 {a b c} {VARINT BLOB VARCHAR(16)}
 check_data $STMT capi3-5.4 {INTEGER INTEGER TEXT} {1 2 3} {1.0 2.0 3.0} {1 2 3}
@@ -824,4 +831,3 @@ if {[llength [info commands sqlite3_sleep]]>0} {
 }
 
 finish_test
-