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Overview
| Comment: | Fix a division-by-zero error that might occur if the sqlite_stat1 table is corrupt. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | stat4-avgeq |
| Files: | files | file ages | folders |
| SHA1: |
f9c053b23ece877a7fdbe82204a10592 |
| User & Date: | dan 2014-10-03 19:29:39 |
Context
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2014-10-04
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| 00:07 | Avoid leaking Index.aiRowEst memory if an OOM causes a rollback which deletes the index before the aiRowEst deletion code in sqlite3AnalysisLoad() routine has a chance to run. Since the aiRowEst now might be deleted from freeIndex() which does not always have a db pointer, make sure the aiRowEst memory is not held in lookaside. check-in: efd87ba1 user: drh tags: stat4-avgeq | |
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2014-10-03
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| 19:29 | Fix a division-by-zero error that might occur if the sqlite_stat1 table is corrupt. check-in: f9c053b2 user: dan tags: stat4-avgeq | |
| 19:16 | Improve the accuracy of the estimates used when searching an index for values not present in any stat4 samples under some circumstances. check-in: e6f7f97d user: dan tags: stat4-avgeq | |
Changes
Changes to src/analyze.c.
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int i; /* Used to iterate through samples */
tRowcnt sumEq = 0; /* Sum of the nEq values */
tRowcnt avgEq = 0;
tRowcnt nRow; /* Number of rows in index */
i64 nSum100 = 0; /* Number of terms contributing to sumEq */
i64 nDist100; /* Number of distinct values in index */
if( pIdx->aiRowEst==0 ){
nRow = pFinal->anLt[iCol];
nDist100 = (i64)100 * pFinal->anDLt[iCol];
nSample--;
}else{
nRow = pIdx->aiRowEst[0];
nDist100 = ((i64)100 * pIdx->aiRowEst[0]) / pIdx->aiRowEst[iCol+1];
}
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int i; /* Used to iterate through samples */
tRowcnt sumEq = 0; /* Sum of the nEq values */
tRowcnt avgEq = 0;
tRowcnt nRow; /* Number of rows in index */
i64 nSum100 = 0; /* Number of terms contributing to sumEq */
i64 nDist100; /* Number of distinct values in index */
if( pIdx->aiRowEst==0 || pIdx->aiRowEst[iCol+1]==0 ){
nRow = pFinal->anLt[iCol];
nDist100 = (i64)100 * pFinal->anDLt[iCol];
nSample--;
}else{
nRow = pIdx->aiRowEst[0];
nDist100 = ((i64)100 * pIdx->aiRowEst[0]) / pIdx->aiRowEst[iCol+1];
}
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