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Overview
| Comment: | Do not invoke btreeComputeFreeSpace() when not necessary. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | deferred-free-space |
| Files: | files | file ages | folders |
| SHA3-256: |
f11b0ed47402034378ded2c60b82841b |
| User & Date: | drh 2019-02-11 22:50:01 |
Context
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2019-02-12
| ||
| 00:58 | Change an assert() into a NEVER(), since the condition is difficult to prove with certainty. Improved comment on the MemPage.nFree field. (Closed-Leaf check-in: fec071b8 user: drh tags: deferred-free-space) | |
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2019-02-11
| ||
| 22:50 | Do not invoke btreeComputeFreeSpace() when not necessary. (check-in: f11b0ed4 user: drh tags: deferred-free-space) | |
| 19:27 | Improvements to comments. No changes to code. (check-in: 16eb0fc8 user: drh tags: deferred-free-space) | |
Changes
Changes to src/btree.c.
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/* Reinitialize page pTo so that the contents of the MemPage structure
** match the new data. The initialization of pTo can actually fail under
** fairly obscure circumstances, even though it is a copy of initialized
** page pFrom.
*/
pTo->isInit = 0;
rc = btreeInitPage(pTo);
if( rc!=SQLITE_OK ){
*pRC = rc;
return;
}
/* If this is an auto-vacuum database, update the pointer-map entries
** for any b-tree or overflow pages that pTo now contains the pointers to.
................................................................................
VVA_ONLY( int balance_quick_called = 0 );
VVA_ONLY( int balance_deeper_called = 0 );
do {
int iPage = pCur->iPage;
MemPage *pPage = pCur->pPage;
if( pPage->nFree<0 ){
rc = btreeComputeFreeSpace(pPage);
if( rc ) break;
}
if( iPage==0 ){
if( pPage->nOverflow ){
/* The root page of the b-tree is overfull. In this case call the
** balance_deeper() function to create a new child for the root-page
** and copy the current contents of the root-page to it. The
** next iteration of the do-loop will balance the child page.
*/
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/* Reinitialize page pTo so that the contents of the MemPage structure
** match the new data. The initialization of pTo can actually fail under
** fairly obscure circumstances, even though it is a copy of initialized
** page pFrom.
*/
pTo->isInit = 0;
rc = btreeInitPage(pTo);
if( rc==SQLITE_OK ) rc = btreeComputeFreeSpace(pTo);
if( rc!=SQLITE_OK ){
*pRC = rc;
return;
}
/* If this is an auto-vacuum database, update the pointer-map entries
** for any b-tree or overflow pages that pTo now contains the pointers to.
................................................................................
VVA_ONLY( int balance_quick_called = 0 );
VVA_ONLY( int balance_deeper_called = 0 );
do {
int iPage = pCur->iPage;
MemPage *pPage = pCur->pPage;
assert( pPage->nFree>=0 );
if( iPage==0 ){
if( pPage->nOverflow ){
/* The root page of the b-tree is overfull. In this case call the
** balance_deeper() function to create a new child for the root-page
** and copy the current contents of the root-page to it. The
** next iteration of the do-loop will balance the child page.
*/
|