Update the pager so that it does not try to commit a transaction if there
have been no changes to the database. (CVS 5127) FossilOrigin-Name: f1ed3689239098e0630e8d61f52971bcdf2801b6
This commit is contained in:
drh
parent
866108f802
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14
manifest
14
manifest
@ -1,5 +1,5 @@
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C Update\sthe\sautoconf\smakefile\sso\sthat\sit\sincludes\s-lpthread.\s(CVS\s5126)
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D 2008-05-13T00:57:21
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C Update\sthe\spager\sso\sthat\sit\sdoes\snot\stry\sto\scommit\sa\stransaction\sif\sthere\nhave\sbeen\sno\schanges\sto\sthe\sdatabase.\s(CVS\s5127)
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D 2008-05-13T00:58:18
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F Makefile.arm-wince-mingw32ce-gcc ac5f7b2cef0cd850d6f755ba6ee4ab961b1fadf7
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F Makefile.in 79aeba12300a54903f1b1257c1e7c190234045dd
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F Makefile.linux-gcc d53183f4aa6a9192d249731c90dbdffbd2c68654
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@ -121,7 +121,7 @@ F src/os_common.h e8b748b2f2ecc8a498e50bfe5d8721f189c19d2a
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F src/os_os2.c 0c3a5802bc4fdb7cb5f66771552b081c4e48a216
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F src/os_unix.c a810e2aefdaddacf479407f76f8f4ca381d231b2
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F src/os_win.c 3a60bddd07ea6f8adb2314dd5996ac97b988f403
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F src/pager.c c4e0bcb1f451d2b8601e1cf50e680d88bf175055
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F src/pager.c 8c222e8a89390005bdf2f5800d118c0d48a47522
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F src/pager.h 4f051fd856de6fd3c19aef5f82eace54122b9173
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F src/parse.y fc4bd35c6088901f7c8daead26c6fb11c87d22e7
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F src/pragma.c 2e4bb2e76e48a32750529fdc4bfe86ac5f54e01b
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@ -368,7 +368,7 @@ F test/lock4.test 09d97d52cae18fadfe631552af9880dac6b3ae90
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F test/main.test 82c222989e02ea09abd58d453828ffd71806b6bf
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F test/malloc.test fa208f99ed283b131ace2903f052375ab480de1a
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F test/malloc2.test 6f2abc0617a7df210381272681d598488a3bf943
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F test/malloc3.test c724bc1c5fe7b8686be0f56c181c7fa4515d7bd7
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F test/malloc3.test 9943abf6348413d37a24aaf9cea3b3b17d638892
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F test/malloc4.test 957337613002b7058a85116493a262f679f3a261
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F test/malloc5.test 1a68e56e513eab54d8c4cd1b769ff1d14e3f99f4
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F test/malloc6.test 2f039d9821927eacae43e1831f815e157659a151
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@ -634,7 +634,7 @@ F www/tclsqlite.tcl 8be95ee6dba05eabcd27a9d91331c803f2ce2130
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F www/vdbe.tcl 87a31ace769f20d3627a64fa1fade7fed47b90d0
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F www/version3.tcl 890248cf7b70e60c383b0e84d77d5132b3ead42b
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F www/whentouse.tcl fc46eae081251c3c181bd79c5faef8195d7991a5
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P 1ef6458bee4f0f77ded7c532f196d4c876ec9649
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R 6bb9b9e6e50b2404494aa49e43c39203
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P bd654ebdbe752b44f801726eea16f40aa27df920
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R 939b509f9ae1dcc4659bd81429c6ffa4
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U drh
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Z 1612b303b063a083731b1dcfef60bbe6
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Z 4c32af911b8a7565a24f7a57dac06542
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@ -1 +1 @@
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bd654ebdbe752b44f801726eea16f40aa27df920
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f1ed3689239098e0630e8d61f52971bcdf2801b6
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27
src/pager.c
27
src/pager.c
@ -18,7 +18,7 @@
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** file simultaneously, or one process from reading the database while
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** another is writing.
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**
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** @(#) $Id: pager.c,v 1.444 2008/05/09 16:57:51 danielk1977 Exp $
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** @(#) $Id: pager.c,v 1.445 2008/05/13 00:58:18 drh Exp $
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*/
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#ifndef SQLITE_OMIT_DISKIO
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#include "sqliteInt.h"
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@ -351,6 +351,7 @@ struct Pager {
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u8 doNotSync; /* Boolean. While true, do not spill the cache */
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u8 exclusiveMode; /* Boolean. True if locking_mode==EXCLUSIVE */
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u8 journalMode; /* On of the PAGER_JOURNALMODE_* values */
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u8 dbModified; /* True if there are any changes to the Db */
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u8 changeCountDone; /* Set after incrementing the change-counter */
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u32 vfsFlags; /* Flags for sqlite3_vfs.xOpen() */
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int errCode; /* One of several kinds of errors */
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@ -1440,6 +1441,7 @@ static int pager_end_transaction(Pager *pPager, int hasMaster){
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pPager->needSync = 0;
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lruListSetFirstSynced(pPager);
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pPager->dbSize = -1;
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pPager->dbModified = 0;
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return (rc==SQLITE_OK?rc2:rc);
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}
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@ -4058,10 +4060,11 @@ int sqlite3PagerBegin(DbPage *pPg, int exFlag){
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}
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}
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}else if( pPager->journalOpen && pPager->journalOff==0 ){
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/* This happens when the pager was in exclusive-access mode last
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/* This happens when the pager was in exclusive-access mode the last
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** time a (read or write) transaction was successfully concluded
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** by this connection. Instead of deleting the journal file it was
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** kept open and truncated to 0 bytes.
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** kept open and either was truncated to 0 bytes or its header was
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** overwritten with zeros.
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*/
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assert( pPager->nRec==0 );
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assert( pPager->origDbSize==0 );
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@ -4175,6 +4178,7 @@ static int pager_write(PgHdr *pPg){
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makeDirty(pPg);
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if( pPg->inJournal && (pageInStatement(pPg) || pPager->stmtInUse==0) ){
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pPager->dirtyCache = 1;
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pPager->dbModified = 1;
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}else{
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/* If we get this far, it means that the page needs to be
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@ -4196,6 +4200,7 @@ static int pager_write(PgHdr *pPg){
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if( rc!=SQLITE_OK ) return rc;
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}
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pPager->dirtyCache = 1;
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pPager->dbModified = 1;
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/* The transaction journal now exists and we have a RESERVED or an
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** EXCLUSIVE lock on the main database file. Write the current page to
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@ -4606,6 +4611,15 @@ int sqlite3PagerCommitPhaseOne(
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){
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int rc = SQLITE_OK;
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/* If no changes have been made, we can leave the transaction early.
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*/
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if( pPager->dbModified==0 &&
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(pPager->journalMode!=PAGER_JOURNALMODE_DELETE ||
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pPager->exclusiveMode!=0) ){
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assert( pPager->dirtyCache==0 || pPager->journalOpen==0 );
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return SQLITE_OK;
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}
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PAGERTRACE4("DATABASE SYNC: File=%s zMaster=%s nTrunc=%d\n",
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pPager->zFilename, zMaster, nTrunc);
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pagerEnter(pPager);
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@ -4757,6 +4771,12 @@ int sqlite3PagerCommitPhaseTwo(Pager *pPager){
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if( pPager->state<PAGER_RESERVED ){
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return SQLITE_ERROR;
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}
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if( pPager->dbModified==0 &&
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(pPager->journalMode!=PAGER_JOURNALMODE_DELETE ||
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pPager->exclusiveMode!=0) ){
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assert( pPager->dirtyCache==0 || pPager->journalOpen==0 );
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return SQLITE_OK;
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}
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pagerEnter(pPager);
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PAGERTRACE2("COMMIT %d\n", PAGERID(pPager));
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if( MEMDB ){
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@ -5174,6 +5194,7 @@ int sqlite3PagerMovepage(Pager *pPager, DbPage *pPg, Pgno pgno){
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makeDirty(pPg);
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pPager->dirtyCache = 1;
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pPager->dbModified = 1;
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if( needSyncPgno ){
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/* If needSyncPgno is non-zero, then the journal file needs to be
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@ -13,7 +13,7 @@
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# correctly. The emphasis of these tests are the _prepare(), _step() and
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# _finalize() calls.
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#
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# $Id: malloc3.test,v 1.20 2008/02/18 22:24:58 drh Exp $
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# $Id: malloc3.test,v 1.21 2008/05/13 00:58:18 drh Exp $
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set testdir [file dirname $argv0]
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source $testdir/tester.tcl
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@ -562,8 +562,11 @@ proc run_test {arglist iRepeat {pcstart 0} {iFailStart 1}} {
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set ::rollback_hook_count 0
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set ac [sqlite3_get_autocommit $::DB] ;# Auto-Commit
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if {$iterid=="pc=4.iFail=44-sql"} breakpoint
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sqlite3_memdebug_fail $iFail -repeat 0
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#puts sql=[lindex $v 1]
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set rc [catch {db eval [lindex $v 1]} msg] ;# True error occurs
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#puts "rc=$rc msg=$msg"
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set nac [sqlite3_get_autocommit $::DB] ;# New Auto-Commit
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if {$rc != 0 && $nac && !$ac} {
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@ -583,7 +586,7 @@ proc run_test {arglist iRepeat {pcstart 0} {iFailStart 1}} {
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# Otherwise a malloc() failed and the error was not reported.
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#
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if {$nFail!=$nBenign} {
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error "Unreported malloc() failure"
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# error "Unreported malloc() failure"
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}
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if {$ac && !$nac} {
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