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On commit, flush dirty temp-file pages only if the file is already open and 25% or more of the cache is dirty.

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FossilOrigin-Name: f6babf2920340f25815c0a3c58de1e902c2f5542
This commit is contained in:
dan
2016-04-13 16:52:11 +00:00
parent 199f56b984
commit 0f52455a35
5 changed files with 46 additions and 10 deletions
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21
src/pager.c
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@@ -1873,6 +1873,25 @@ 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 db is an in-memory database.
**
** * The db is a temporary database and the db file has not been opened.
**
** * The db is a temporary database and the cache contains less than
** C/4 dirty pages, where C is the configured cache-size.
*/
static int pagerFlushOnCommit(Pager *pPager){
if( pPager->tempFile==0 ) return 1;
if( !isOpen(pPager->fd) ) return 0;
return (sqlite3PCachePercentDirty(pPager->pPCache)>=25);
}
/*
** This routine ends a transaction. A transaction is usually ended by
** either a COMMIT or a ROLLBACK operation. This routine may be called
@@ -2011,7 +2030,7 @@ static int pager_end_transaction(Pager *pPager, int hasMaster, int bCommit){
sqlite3BitvecDestroy(pPager->pInJournal);
pPager->pInJournal = 0;
pPager->nRec = 0;
if( isOpen(pPager->fd) || MEMDB ){
if( pagerFlushOnCommit(pPager) ){
sqlite3PcacheCleanAll(pPager->pPCache);
}else{
sqlite3PcacheClearWritable(pPager->pPCache);