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Change the pcache module to keep track of the total number of references to

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all pages rather than the number of pages references, for a performance
improvement and size reduction.

FossilOrigin-Name: f00a9e1e998c4bd249a45444dc2d71a7e4903b8b
This commit is contained in:
drh
2015-09-03 20:43:55 +00:00
parent 98c5f8795a
commit 95a0b37156
5 changed files with 32 additions and 24 deletions
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6
src/pager.c
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@@ -5261,6 +5261,10 @@ int sqlite3PagerAcquire(
#endif
);
/* Optimization note: Adding the "pgno<=1" term before "pgno==0" here
** allows the compiler optimizer to reuse the results of the "pgno>1"
** test in the previous statement, and avoid testing pgno==0 in the
** common case where pgno is large. */
if( pgno<=1 && pgno==0 ){
return SQLITE_CORRUPT_BKPT;
}
@@ -6390,7 +6394,7 @@ u8 sqlite3PagerIsreadonly(Pager *pPager){
#ifdef SQLITE_DEBUG
/*
** Return the number of references to the pager.
** Return the sum of the reference counts for all pages held by pPager.
*/
int sqlite3PagerRefcount(Pager *pPager){
return sqlite3PcacheRefCount(pPager->pPCache);