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Overview
Comment: | Another minor optimization to OP_Transaction. |
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Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | trunk |
Files: | files | file ages | folders |
SHA3-256: |
d80077aee3904e5d93164b342cae14d8 |
User & Date: | drh 2018-06-06 17:45:51.934 |
Context
2018-06-06
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18:50 | Fix the sqlite3BeginTrans() calls within the snapshot extension. (check-in: 1fef7ad25b user: drh tags: trunk) | |
17:45 | Another minor optimization to OP_Transaction. (check-in: d80077aee3 user: drh tags: trunk) | |
16:28 | Change sqlite3BtreeBeginTrans() to return the BTREE_SCHEMA_COOKIE, for a small speed improvement when starting new transactions. (check-in: a10662aa91 user: drh tags: trunk) | |
Changes
Changes to src/vdbe.c.
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3199 3200 3201 3202 3203 3204 3205 | ** generation counter, then an SQLITE_SCHEMA error is raised and execution ** halts. The sqlite3_step() wrapper function might then reprepare the ** statement and rerun it from the beginning. */ case OP_Transaction: { Btree *pBt; int iMeta = 0; | < | 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 | ** generation counter, then an SQLITE_SCHEMA error is raised and execution ** halts. The sqlite3_step() wrapper function might then reprepare the ** statement and rerun it from the beginning. */ case OP_Transaction: { Btree *pBt; int iMeta = 0; assert( p->bIsReader ); assert( p->readOnly==0 || pOp->p2==0 ); assert( pOp->p1>=0 && pOp->p1<db->nDb ); assert( DbMaskTest(p->btreeMask, pOp->p1) ); if( pOp->p2 && (db->flags & SQLITE_QueryOnly)!=0 ){ rc = SQLITE_READONLY; |
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3245 3246 3247 3248 3249 3250 3251 | /* Store the current value of the database handles deferred constraint ** counter. If the statement transaction needs to be rolled back, ** the value of this counter needs to be restored too. */ p->nStmtDefCons = db->nDeferredCons; p->nStmtDefImmCons = db->nDeferredImmCons; } | | > > > | > > < < < < | 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 | /* Store the current value of the database handles deferred constraint ** counter. If the statement transaction needs to be rolled back, ** the value of this counter needs to be restored too. */ p->nStmtDefCons = db->nDeferredCons; p->nStmtDefImmCons = db->nDeferredImmCons; } } assert( pOp->p5==0 || pOp->p4type==P4_INT32 ); if( pOp->p5 && (iMeta!=pOp->p3 || db->aDb[pOp->p1].pSchema->iGeneration!=pOp->p4.i) ){ /* ** IMPLEMENTATION-OF: R-03189-51135 As each SQL statement runs, the schema ** version is checked to ensure that the schema has not changed since the ** SQL statement was prepared. */ sqlite3DbFree(db, p->zErrMsg); p->zErrMsg = sqlite3DbStrDup(db, "database schema has changed"); /* If the schema-cookie from the database file matches the cookie ** stored with the in-memory representation of the schema, do ** not reload the schema from the database file. ** ** If virtual-tables are in use, this is not just an optimization. |
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