database/sqlite
1
0
Fork 0
mirror of https://github.com/sqlite/sqlite.git synced 2025-08-05 15:55:57 +03:00
Code Activity

Clarification of the pagerFlushOnCommit() logic.

Browse Source 
FossilOrigin-Name: 3401d9dcdbec390564574e8d2972c944c204e025
This commit is contained in:
drh
2016-05-13 12:12:38 +00:00
parent 935c4d8484
commit 4bf7d21f56
3 changed files with 22 additions and 18 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
manifest
View File

@@ -1,5 +1,5 @@
C Fix\spager_end_transaction()\sto\sensure\sthat\sa\sROLLBACK\sdoes\snot\sclobber\nunwritten\spages\sin\sa\sTEMP\sfile\spcache.
D 2016-05-13T11:50:00.812
C Clarification\sof\sthe\spagerFlushOnCommit()\slogic.
D 2016-05-13T12:12:38.291
F Makefile.in 9eda6e1c90d05c199c3ec8a7069b0682ad307657
F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
F Makefile.msc db82b35aef27f412fef14d8534afc022138bcdfd
@@ -364,7 +364,7 @@ F src/os_setup.h c9d4553b5aaa6f73391448b265b89bed0b890faa
F src/os_unix.c a9443cdab41d7f3cdf0df3a5aab62fd6e1c9b234
F src/os_win.c 852fc2ff6084296348ed3739c548b2cf32df394e
F src/os_win.h eb7a47aa17b26b77eb97e4823f20a00b8bda12ca
F src/pager.c 64f42bd0d20f180f99727ce5a3755a97c9a12700
F src/pager.c 665c5a4da55952ac144c29d83e7f24393ce80dce
F src/pager.h 329bdf078a4e0a3b35084534d58625d21fd03681
F src/parse.y 10eb2f3fb62341291528c7984498054731f9d31e
F src/pcache.c ad5ce697dc5a734caddb2b1eac83b195da95ddbe
@@ -1488,7 +1488,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
P 32a62e3bd46cf58586617d3f8b1a971c91df205e
R 7ea6babb6ca28821d5ebb371842cc2c9
P 9495d33879221c1821331dc72c61a6a3d182f526
R 6b2058239dcedcc73d7ba7314be4d002
U drh
Z 5e0d604d556f91727b00c6f570867611
Z 481738e778b68e5e24387a60a8825df4

2
manifest.uuid
View File

@@ -1 +1 @@
9495d33879221c1821331dc72c61a6a3d182f526
3401d9dcdbec390564574e8d2972c944c204e025

26
src/pager.c
View File

@@ -1876,20 +1876,24 @@ static int pager_error(Pager *pPager, int rc){
static int pager_truncate(Pager *pPager, Pgno nPage);
/*
** The write transaction open on the pager passed as the only argument is
** being committed. This function returns true if all dirty pages should
** be flushed to disk, or false otherwise. Pages should be flushed to disk
** unless one of the following is true:
** The write transaction open on pPager is being committed (bCommit==1)
** or rolled back (bCommit==0).
**
** * The db is an in-memory database.
** Return TRUE if and only if all dirty pages should be flushed to disk.
**
** * The db is a temporary database and the db file has not been opened.
** Rules:
**
** * The db is a temporary database and the cache contains less than
** C/4 dirty pages, where C is the configured cache-size.
** * For non-TEMP databases, always sync to disk. This is necessary
** for transactions to be durable.
**
** * Sync TEMP database only on a COMMIT (not a ROLLBACK) when the backing
** file has been created already (via a spill on pagerStress()) and
** when the number of dirty pages in memory exceeds 25% of the total
** cache size.
*/
static int pagerFlushOnCommit(Pager *pPager){
static int pagerFlushOnCommit(Pager *pPager, int bCommit){
if( pPager->tempFile==0 ) return 1;
if( !bCommit ) return 0;
if( !isOpen(pPager->fd) ) return 0;
return (sqlite3PCachePercentDirty(pPager->pPCache)>=25);
}
@@ -2033,7 +2037,7 @@ static int pager_end_transaction(Pager *pPager, int hasMaster, int bCommit){
pPager->pInJournal = 0;
pPager->nRec = 0;
if( rc==SQLITE_OK ){
if( !pPager->tempFile || (bCommit && pagerFlushOnCommit(pPager)) ){
if( pagerFlushOnCommit(pPager, bCommit) ){
sqlite3PcacheCleanAll(pPager->pPCache);
}else{
sqlite3PcacheClearWritable(pPager->pPCache);
@@ -6206,7 +6210,7 @@ int sqlite3PagerCommitPhaseOne(
assert( MEMDB==0 || pPager->tempFile );
assert( isOpen(pPager->fd) || pPager->tempFile );
if( 0==pagerFlushOnCommit(pPager) ){
if( 0==pagerFlushOnCommit(pPager, 1) ){
/* If this is an in-memory db, or no pages have been written to, or this
** function has already been called, it is mostly a no-op. However, any
** backup in progress needs to be restarted. */