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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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23
src/btree.c
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@@ -3300,7 +3300,7 @@ int sqlite3BtreeNewDb(Btree *p){
** when A already has a read lock, we encourage A to give up and let B
** proceed.
*/
int sqlite3BtreeBeginTrans(Btree *p, int wrflag){
int sqlite3BtreeBeginTrans(Btree *p, int wrflag, int *pSchemaVersion){
BtShared *pBt = p->pBt;
int rc = SQLITE_OK;
@@ -3428,12 +3428,17 @@ int sqlite3BtreeBeginTrans(Btree *p, int wrflag){
trans_begun:
if( rc==SQLITE_OK && wrflag ){
/* This call makes sure that the pager has the correct number of
** open savepoints. If the second parameter is greater than 0 and
** the sub-journal is not already open, then it will be opened here.
*/
rc = sqlite3PagerOpenSavepoint(pBt->pPager, p->db->nSavepoint);
if( rc==SQLITE_OK ){
if( pSchemaVersion ){
*pSchemaVersion = get4byte(&pBt->pPage1->aData[40]);
}
if( wrflag ){
/* This call makes sure that the pager has the correct number of
** open savepoints. If the second parameter is greater than 0 and
** the sub-journal is not already open, then it will be opened here.
*/
rc = sqlite3PagerOpenSavepoint(pBt->pPager, p->db->nSavepoint);
}
}
btreeIntegrity(p);
@@ -10084,11 +10089,11 @@ int sqlite3BtreeSetVersion(Btree *pBtree, int iVersion){
pBt->btsFlags &= ~BTS_NO_WAL;
if( iVersion==1 ) pBt->btsFlags |= BTS_NO_WAL;
rc = sqlite3BtreeBeginTrans(pBtree, 0);
rc = sqlite3BtreeBeginTrans(pBtree, 0, 0);
if( rc==SQLITE_OK ){
u8 *aData = pBt->pPage1->aData;
if( aData[18]!=(u8)iVersion || aData[19]!=(u8)iVersion ){
rc = sqlite3BtreeBeginTrans(pBtree, 2);
rc = sqlite3BtreeBeginTrans(pBtree, 2, 0);
if( rc==SQLITE_OK ){
rc = sqlite3PagerWrite(pBt->pPage1->pDbPage);
if( rc==SQLITE_OK ){