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Overview
Comment: | Performance improvement: reduce the number of calls to ptrmapPageno() made by ptrmapPut() and ptrmapGet(). (CVS 5437) |
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Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | trunk |
Files: | files | file ages | folders |
SHA1: |
d807fb271340901bbf3e06de23d91132 |
User & Date: | danielk1977 2008-07-18 09:34:57.000 |
Context
2008-07-18
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17:03 | Make sure expression spans are set correctly for "x.*" expressions in the result set of a SELECT. Ticket #3229. (CVS 5438) (check-in: 17a9984e76 user: drh tags: trunk) | |
09:34 | Performance improvement: reduce the number of calls to ptrmapPageno() made by ptrmapPut() and ptrmapGet(). (CVS 5437) (check-in: d807fb2713 user: danielk1977 tags: trunk) | |
08:10 | Speed up sqlite3_finalize() by removing redundant code. (CVS 5436) (check-in: c94318b982 user: danielk1977 tags: trunk) | |
Changes
Changes to src/btree.c.
1 2 3 4 5 6 7 8 9 10 11 | /* ** 2004 April 6 ** ** The author disclaims copyright to this source code. In place of ** a legal notice, here is a blessing: ** ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* | | | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | /* ** 2004 April 6 ** ** The author disclaims copyright to this source code. In place of ** a legal notice, here is a blessing: ** ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** $Id: btree.c,v 1.488 2008/07/18 09:34:57 danielk1977 Exp $ ** ** This file implements a external (disk-based) database using BTrees. ** See the header comment on "btreeInt.h" for additional information. ** Including a description of file format and an overview of operation. */ #include "btreeInt.h" |
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454 455 456 457 458 459 460 | return SQLITE_CORRUPT_BKPT; } iPtrmap = PTRMAP_PAGENO(pBt, key); rc = sqlite3PagerGet(pBt->pPager, iPtrmap, &pDbPage); if( rc!=SQLITE_OK ){ return rc; } | | | 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 | return SQLITE_CORRUPT_BKPT; } iPtrmap = PTRMAP_PAGENO(pBt, key); rc = sqlite3PagerGet(pBt->pPager, iPtrmap, &pDbPage); if( rc!=SQLITE_OK ){ return rc; } offset = PTRMAP_PTROFFSET(iPtrmap, key); pPtrmap = (u8 *)sqlite3PagerGetData(pDbPage); if( eType!=pPtrmap[offset] || get4byte(&pPtrmap[offset+1])!=parent ){ TRACE(("PTRMAP_UPDATE: %d->(%d,%d)\n", key, eType, parent)); rc = sqlite3PagerWrite(pDbPage); if( rc==SQLITE_OK ){ pPtrmap[offset] = eType; |
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493 494 495 496 497 498 499 | iPtrmap = PTRMAP_PAGENO(pBt, key); rc = sqlite3PagerGet(pBt->pPager, iPtrmap, &pDbPage); if( rc!=0 ){ return rc; } pPtrmap = (u8 *)sqlite3PagerGetData(pDbPage); | | | 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 | iPtrmap = PTRMAP_PAGENO(pBt, key); rc = sqlite3PagerGet(pBt->pPager, iPtrmap, &pDbPage); if( rc!=0 ){ return rc; } pPtrmap = (u8 *)sqlite3PagerGetData(pDbPage); offset = PTRMAP_PTROFFSET(iPtrmap, key); assert( pEType!=0 ); *pEType = pPtrmap[offset]; if( pPgno ) *pPgno = get4byte(&pPtrmap[offset+1]); sqlite3PagerUnref(pDbPage); if( *pEType<1 || *pEType>5 ) return SQLITE_CORRUPT_BKPT; return SQLITE_OK; |
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Changes to src/btreeInt.h.
1 2 3 4 5 6 7 8 9 10 11 | /* ** 2004 April 6 ** ** The author disclaims copyright to this source code. In place of ** a legal notice, here is a blessing: ** ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* | | | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | /* ** 2004 April 6 ** ** The author disclaims copyright to this source code. In place of ** a legal notice, here is a blessing: ** ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** $Id: btreeInt.h,v 1.29 2008/07/18 09:34:57 danielk1977 Exp $ ** ** This file implements a external (disk-based) database using BTrees. ** For a detailed discussion of BTrees, refer to ** ** Donald E. Knuth, THE ART OF COMPUTER PROGRAMMING, Volume 3: ** "Sorting And Searching", pages 473-480. Addison-Wesley ** Publishing Company, Reading, Massachusetts. |
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523 524 525 526 527 528 529 | ** ** If the pgno argument passed to PTRMAP_PAGENO is a pointer-map page, ** then pgno is returned. So (pgno==PTRMAP_PAGENO(pgsz, pgno)) can be ** used to test if pgno is a pointer-map page. PTRMAP_ISPAGE implements ** this test. */ #define PTRMAP_PAGENO(pBt, pgno) ptrmapPageno(pBt, pgno) | | | 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 | ** ** If the pgno argument passed to PTRMAP_PAGENO is a pointer-map page, ** then pgno is returned. So (pgno==PTRMAP_PAGENO(pgsz, pgno)) can be ** used to test if pgno is a pointer-map page. PTRMAP_ISPAGE implements ** this test. */ #define PTRMAP_PAGENO(pBt, pgno) ptrmapPageno(pBt, pgno) #define PTRMAP_PTROFFSET(pgptrmap, pgno) (5*(pgno-pgptrmap-1)) #define PTRMAP_ISPAGE(pBt, pgno) (PTRMAP_PAGENO((pBt),(pgno))==(pgno)) /* ** The pointer map is a lookup table that identifies the parent page for ** each child page in the database file. The parent page is the page that ** contains a pointer to the child. Every page in the database contains ** 0 or 1 parent pages. (In this context 'database page' refers |
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