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Change to using packed-memory-arrays instead of b-trees when performing an offline merge-sort for CREATE INDEX. This makes it easier to control the number of disc seeks required when merging.

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FossilOrigin-Name: a4770d079c1b236eb54751e75a44cccc997c6b93
This commit is contained in:
dan
2011-08-04 12:14:04 +00:00
parent 7fe6270b4d
commit c6e734554f
5 changed files with 282 additions and 153 deletions
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11
src/btree.c
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@@ -7277,9 +7277,16 @@ static int btreeDropTable(Btree *p, Pgno iTable, int *piMoved){
return rc;
}
int sqlite3BtreeDropTable(Btree *p, int iTable, int *piMoved){
BtShared *pBt = p->pBt;
int rc;
sqlite3BtreeEnter(p);
rc = btreeDropTable(p, iTable, piMoved);
if( (pBt->openFlags&BTREE_SINGLE) ){
pBt->nPage = 0;
sqlite3PagerTruncateImage(pBt->pPager, 1);
rc = newDatabase(pBt);
}else{
rc = btreeDropTable(p, iTable, piMoved);
}
sqlite3BtreeLeave(p);
return rc;
}
@@ -8168,3 +8175,5 @@ int sqlite3BtreeSetVersion(Btree *pBtree, int iVersion){
pBt->doNotUseWAL = 0;
return rc;
}