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Overview
| Comment: | For in-memory databases, it does not matter if pcache entries are marked "clean" or "writable". |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
06c1e27ca868f247f8c27b03eb19aac0 |
| User & Date: | drh 2016-05-12 12:08:48 |
Context
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2016-05-12
| ||
| 17:06 | Add extra OPTIMIZATION-IF-FALSE comments where required to pcache.c. (check-in: 9d55b8f5 user: dan tags: trunk) | |
| 12:08 | For in-memory databases, it does not matter if pcache entries are marked "clean" or "writable". (check-in: 06c1e27c user: drh tags: trunk) | |
| 12:01 | Remove an unnecessary call to sqlite3PcacheMakeClean() inside of the ROLLBACK logic. (check-in: 0dc50d99 user: drh tags: trunk) | |
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2016-05-11
| ||
| 23:54 | For in-memory databases, it does not matter if pcache entries are marked "clean" or "writable". (Closed-Leaf check-in: ad601c79 user: drh tags: pager-dev) | |
Changes
Changes to src/pager.c.
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}
#endif
sqlite3BitvecDestroy(pPager->pInJournal);
pPager->pInJournal = 0;
pPager->nRec = 0;
if( rc==SQLITE_OK ){
if( MEMDB || pagerFlushOnCommit(pPager) ){
sqlite3PcacheCleanAll(pPager->pPCache);
}else{
sqlite3PcacheClearWritable(pPager->pPCache);
}
sqlite3PcacheTruncate(pPager->pPCache, pPager->dbSize);
}
|
| |
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}
#endif
sqlite3BitvecDestroy(pPager->pInJournal);
pPager->pInJournal = 0;
pPager->nRec = 0;
if( rc==SQLITE_OK ){
if( pagerFlushOnCommit(pPager) ){
sqlite3PcacheCleanAll(pPager->pPCache);
}else{
sqlite3PcacheClearWritable(pPager->pPCache);
}
sqlite3PcacheTruncate(pPager->pPCache, pPager->dbSize);
}
|
Changes to src/pcache.c.
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** ************************************************************************* ** This file implements that page cache. */ #include "sqliteInt.h" /* ** A complete page cache is an instance of this structure. ** ** pDirty, pDirtyTail, pSynced: ** All dirty pages are linked into the doubly linked list using ** PgHdr.pDirtyNext and pDirtyPrev. The list is maintained in LRU order ** such that p was added to the list more recently than p->pDirtyNext. ** PCache.pDirty points to the first (newest) element in the list and ** pDirtyTail to the last (oldest). |
| > > > > > > |
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** ************************************************************************* ** This file implements that page cache. */ #include "sqliteInt.h" /* ** A complete page cache is an instance of this structure. Every ** entry in the cache holds a single page of the database file. The ** btree layer only operates on the cached copy of the database pages. ** ** A page cache entry is "clean" if it exactly matches what is currently ** on disk. A page is "dirty" if it has been modified and needs to be ** persisted to disk. ** ** pDirty, pDirtyTail, pSynced: ** All dirty pages are linked into the doubly linked list using ** PgHdr.pDirtyNext and pDirtyPrev. The list is maintained in LRU order ** such that p was added to the list more recently than p->pDirtyNext. ** PCache.pDirty points to the first (newest) element in the list and ** pDirtyTail to the last (oldest). |
Changes to src/pcache.h.
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** Every page in the cache is controlled by an instance of the following
** structure.
*/
struct PgHdr {
sqlite3_pcache_page *pPage; /* Pcache object page handle */
void *pData; /* Page data */
void *pExtra; /* Extra content */
PgHdr *pDirty; /* Transient list of dirty pages */
Pager *pPager; /* The pager this page is part of */
Pgno pgno; /* Page number for this page */
#ifdef SQLITE_CHECK_PAGES
u32 pageHash; /* Hash of page content */
#endif
u16 flags; /* PGHDR flags defined below */
|
| |
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** Every page in the cache is controlled by an instance of the following
** structure.
*/
struct PgHdr {
sqlite3_pcache_page *pPage; /* Pcache object page handle */
void *pData; /* Page data */
void *pExtra; /* Extra content */
PgHdr *pDirty; /* Transient list of dirty sorted by pgno */
Pager *pPager; /* The pager this page is part of */
Pgno pgno; /* Page number for this page */
#ifdef SQLITE_CHECK_PAGES
u32 pageHash; /* Hash of page content */
#endif
u16 flags; /* PGHDR flags defined below */
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