When trying to transition from journal_mode MEMORY to WAL, use OFF as an

intermediate journal mode.

FossilOrigin-Name: 4775b8f9a9d9b66fcd5abf3af111fcad249e662e

manifest

@@ -1,5 +1,8 @@
-C Some\schanges\sto\stest\sscripts\srelated\sto\scodec\senabled\sversions\sof\ssqlite.
-D 2010-06-22T13:46:44
+-----BEGIN PGP SIGNED MESSAGE-----
+Hash: SHA1
+
+C When\strying\sto\stransition\sfrom\sjournal_mode\sMEMORY\sto\sWAL,\suse\sOFF\sas\san\nintermediate\sjournal\smode.
+D 2010-06-22T14:49:40
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@@ -217,7 +220,7 @@ F src/update.c 9859f2056c7739a1db0d9774ccb6c2f0cee6d1de
 F src/utf.c 1baeeac91707a4df97ccc6141ec0f808278af685
 F src/util.c 32aebf04c10e51ad3977a928b7416bed671b620b
 F src/vacuum.c 241a8386727c1497eba4955933356dfba6ff8c9f
-F src/vdbe.c 290d20ed92b560dc0b602ac50b252f9553a2d8e8
+F src/vdbe.c 8b3bae957a874891361e4b5ada373e6f49e18630
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 F src/vdbeInt.h 19ebc8c2a2e938340051ee65af3f377fb99102d1
 F src/vdbeapi.c dc3138f10afbc95ed3c21dd25abb154504b1db9d
@@ -825,7 +828,14 @@ F tool/speedtest2.tcl ee2149167303ba8e95af97873c575c3e0fab58ff
 F tool/speedtest8.c 2902c46588c40b55661e471d7a86e4dd71a18224
 F tool/speedtest8inst1.c 293327bc76823f473684d589a8160bde1f52c14e
 F tool/vdbe-compress.tcl d70ea6d8a19e3571d7ab8c9b75cba86d1173ff0f
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manifest.uuid

@@ -1 +1 @@
-85dd51a75c75b2a123744f646e04538e4e5d89b3
+4775b8f9a9d9b66fcd5abf3af111fcad249e662e

src/vdbe.c

@@ -5249,6 +5249,10 @@ case OP_JournalMode: {    /* out2-prerelease */
         if( rc==SQLITE_OK ){
           sqlite3PagerSetJournalMode(pPager, eNew);
         }
+      }else if( eOld==PAGER_JOURNALMODE_MEMORY ){
+        /* Cannot transition directly from MEMORY to WAL.  Use mode OFF
+        ** as an intermediate */
+        sqlite3PagerSetJournalMode(pPager, PAGER_JOURNALMODE_OFF);
       }
   
       /* Open a transaction on the database file. Regardless of the journal