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Change sqlite3BtreeBeginTrans() to return the BTREE_SCHEMA_COOKIE, for a

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small speed improvement when starting new transactions.

FossilOrigin-Name: a10662aa915ae2b5a78b3e10920350d32255b2d6b1a8aac0aba1ad173b07ed2b
This commit is contained in:
drh
2018-06-06 16:28:40 +00:00
parent 0cfd46a1ad
commit bb2d9b1bf1
10 changed files with 41 additions and 39 deletions
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11
src/vdbe.c
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@@ -3202,8 +3202,8 @@ case OP_AutoCommit: {
*/
case OP_Transaction: {
Btree *pBt;
int iMeta;
int iGen;
int iMeta = 0;
int iGen = 0;
assert( p->bIsReader );
assert( p->readOnly==0 || pOp->p2==0 );
@@ -3216,7 +3216,7 @@ case OP_Transaction: {
pBt = db->aDb[pOp->p1].pBt;
if( pBt ){
rc = sqlite3BtreeBeginTrans(pBt, pOp->p2);
rc = sqlite3BtreeBeginTrans(pBt, pOp->p2, &iMeta);
testcase( rc==SQLITE_BUSY_SNAPSHOT );
testcase( rc==SQLITE_BUSY_RECOVERY );
if( rc!=SQLITE_OK ){
@@ -3255,10 +3255,7 @@ case OP_Transaction: {
** version is checked to ensure that the schema has not changed since the
** SQL statement was prepared.
*/
sqlite3BtreeGetMeta(pBt, BTREE_SCHEMA_VERSION, (u32 *)&iMeta);
iGen = db->aDb[pOp->p1].pSchema->iGeneration;
}else{
iGen = iMeta = 0;
}
assert( pOp->p5==0 || pOp->p4type==P4_INT32 );
if( pOp->p5 && (iMeta!=pOp->p3 || iGen!=pOp->p4.i) ){
@@ -3626,7 +3623,7 @@ case OP_OpenEphemeral: {
rc = sqlite3BtreeOpen(db->pVfs, 0, db, &pCx->pBtx,
BTREE_OMIT_JOURNAL | BTREE_SINGLE | pOp->p5, vfsFlags);
if( rc==SQLITE_OK ){
rc = sqlite3BtreeBeginTrans(pCx->pBtx, 1);
rc = sqlite3BtreeBeginTrans(pCx->pBtx, 1, 0);
}
if( rc==SQLITE_OK ){
/* If a transient index is required, create it by calling