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Overview
| Comment: | Within a write-transaction on a wal database in mmap mode, check the page-cache for an entry before the wal file. This can be faster if the wal file is very large. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | mmap-wal-bigtrans |
| Files: | files | file ages | folders |
| SHA1: |
3a82c8e6cb7227fe05e304c9550d0398 |
| User & Date: | dan 2015-08-07 09:42:12 |
Context
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2015-08-07
| ||
| 09:42 | Within a write-transaction on a wal database in mmap mode, check the page-cache for an entry before the wal file. This can be faster if the wal file is very large. Leaf check-in: 3a82c8e6 user: dan tags: mmap-wal-bigtrans | |
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2015-08-06
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| 12:54 | increase the version number to 3.8.12 check-in: e596a6b6 user: drh tags: trunk | |
Changes
Changes to src/pager.c.
5270 5270 pPager->hasBeenUsed = 1; 5271 5271 5272 5272 /* If the pager is in the error state, return an error immediately. 5273 5273 ** Otherwise, request the page from the PCache layer. */ 5274 5274 if( pPager->errCode!=SQLITE_OK ){ 5275 5275 rc = pPager->errCode; 5276 5276 }else{ 5277 - if( bMmapOk && pagerUseWal(pPager) ){ 5278 - rc = sqlite3WalFindFrame(pPager->pWal, pgno, &iFrame); 5279 - if( rc!=SQLITE_OK ) goto pager_acquire_err; 5280 - } 5277 + if( bMmapOk ){ 5278 + if( pPager->eState>PAGER_READER ){ 5279 + pPg = sqlite3PagerLookup(pPager, pgno); 5280 + } 5281 5281 5282 - if( bMmapOk && iFrame==0 ){ 5283 - void *pData = 0; 5282 + if( pPg==0 && pagerUseWal(pPager) ){ 5283 + rc = sqlite3WalFindFrame(pPager->pWal, pgno, &iFrame); 5284 + if( rc!=SQLITE_OK ) goto pager_acquire_err; 5285 + } 5284 5286 5285 - rc = sqlite3OsFetch(pPager->fd, 5286 - (i64)(pgno-1) * pPager->pageSize, pPager->pageSize, &pData 5287 - ); 5288 - 5289 - if( rc==SQLITE_OK && pData ){ 5290 - if( pPager->eState>PAGER_READER ){ 5291 - pPg = sqlite3PagerLookup(pPager, pgno); 5292 - } 5293 - if( pPg==0 ){ 5287 + if( pPg==0 && iFrame==0 ){ 5288 + void *pData = 0; 5289 + rc = sqlite3OsFetch(pPager->fd, 5290 + (i64)(pgno-1) * pPager->pageSize, pPager->pageSize, &pData 5291 + ); 5292 + if( rc==SQLITE_OK && pData ){ 5294 5293 rc = pagerAcquireMapPage(pPager, pgno, pData, &pPg); 5295 - }else{ 5296 - sqlite3OsUnfetch(pPager->fd, (i64)(pgno-1)*pPager->pageSize, pData); 5297 - } 5298 - if( pPg ){ 5299 - assert( rc==SQLITE_OK ); 5300 - *ppPage = pPg; 5301 - return SQLITE_OK; 5302 5294 } 5303 5295 } 5296 + 5297 + if( pPg ){ 5298 + assert( rc==SQLITE_OK ); 5299 + *ppPage = pPg; 5300 + return SQLITE_OK; 5301 + } 5302 + 5304 5303 if( rc!=SQLITE_OK ){ 5305 5304 goto pager_acquire_err; 5306 5305 } 5307 5306 } 5308 5307 5309 5308 { 5310 5309 sqlite3_pcache_page *pBase;