Index gone bad ! Please help.
Hi
Well, this time I ran some tests in 10gR2 database.
I analysed whole schema using dbms_stats, so all tables and indexes are analysed now.
I ran 2 queries, want your views about their EXPLAIN plans. Table here in concern is MTC_BLNG_EXCEPTION_DTL_ODS.
First query finished in 243 s with FULL table scan when NO Index was there on table.
When I created a local prefixed index, it took around 2000 s with following plan. Please note at bottom step #24 its doing Index range scan, then in #3, its accessing table using Index rowid. Performance has degraded USING INDEX. I wonder WHY Oracle did not choose FULL scan ?
| Id | Operation | Name | Rows | Bytes | Cost | Pstart| Pstop |
| 0 | SELECT STATEMENT | | 1 | 252 | 258 | | |
| 1 | WINDOW BUFFER | | 1 | 252 | 258 | | |
| 2 | SORT GROUP BY | | 1 | 252 | 258 | | |
|* 3 | TABLE ACCESS BY LOCAL INDEX ROWID| MTC_BLNG_EXCEPTION_DTL_ODS | 1 | 53 | 160 | 62 | 62 |
| 4 | NESTED LOOPS | | 1 | 252 | 242 | | |
| 5 | MERGE JOIN CARTESIAN | | 1 | 199 | 82 | | |
| 6 | MERGE JOIN CARTESIAN | | 1 | 179 | 62 | | |
| 7 | MERGE JOIN CARTESIAN | | 1 | 167 | 41 | | |
| 8 | VIEW | MTC EXCPN COMPANY V | 1 | 18 | 21 | | |
| 9 | SORT ORDER BY | | 1 | 91 | 21 | | |
|* 10 | FILTER | | | | | | |
|* 11 | TABLE ACCESS FULL | MTC_CD_LKUP | 1 | 91 | 5 | | |
| 12 | BUFFER SORT | | 1 | 149 | 41 | | |
| 13 | VIEW | MTC EXCPN NUM V | 1 | 149 | 21 | | |
| 14 | SORT ORDER BY | | 1 | 91 | 21 | | |
|* 15 | TABLE ACCESS FULL | MTC_CD_LKUP | 1 | 91 | 5 | | |
| 16 | BUFFER SORT | | 1 | 12 | 41 | | |
| 17 | VIEW | MTC EXCPN CATEGORY CD V | 1 | 12 | 21 | | |
| 18 | SORT ORDER BY | | 1 | 91 | 21 | | |
|* 19 | TABLE ACCESS FULL | MTC_CD_LKUP | 1 | 91 | 5 | | |
| 20 | BUFFER SORT | | 1 | 20 | 61 | | |
| 21 | VIEW | MTC EXCPN TYPE V | 1 | 20 | 21 | | |
| 22 | SORT ORDER BY | | 1 | 91 | 21 | | |
|* 23 | TABLE ACCESS FULL | MTC_CD_LKUP | 1 | 91 | 5 | | |
|* 24 | INDEX RANGE SCAN | BLNG_EXCPN_RPT_INS_TMST_LO_IDX | 38019 | | 145 | 62 | 62 |
-----------------------------------------------------------------------------------------------------------------------In second query, following plan is coming. FULL scan was BAD, same INDEX was created, and following plan came out.
NOTE that #31 is doing Index range scan and then IMMEDIATELY feeding to #30 for table access by rowid, thereby limiting rows to 1056 from 38019.
| Id | Operation | Name | Rows | Bytes | Cost | Pstart| Pstop |
| 0 | SELECT STATEMENT | | 1 | 222 | 298 | | |
| 1 | WINDOW SORT | | 1 | 222 | 298 | | |
| 2 | VIEW | | 1 | 222 | 298 | | |
| 3 | WINDOW BUFFER | | 1 | 266 | 298 | | |
| 4 | SORT GROUP BY | | 1 | 266 | 298 | | |
|* 5 | HASH JOIN | | 1 | 266 | 283 | | |
| 6 | MERGE JOIN CARTESIAN | | 22 | 4488 | 103 | | |
| 7 | MERGE JOIN CARTESIAN | | 1 | 70 | 82 | | |
| 8 | MERGE JOIN CARTESIAN | | 1 | 50 | 62 | | |
| 9 | MERGE JOIN CARTESIAN | | 1 | 38 | 41 | | |
| 10 | VIEW | MTC EXCPN TYPE V | 1 | 20 | 21 | | |
| 11 | SORT ORDER BY | | 1 | 91 | 21 | | |
|* 12 | TABLE ACCESS FULL | MTC_CD_LKUP | 1 | 91 | 5 | | |
| 13 | BUFFER SORT | | 1 | 18 | 41 | | |
| 14 | VIEW | MTC EXCPN COMPANY V | 1 | 18 | 21 | | |
| 15 | SORT ORDER BY | | 1 | 91 | 21 | | |
|* 16 | TABLE ACCESS FULL | MTC_CD_LKUP | 1 | 91 | 5 | | |
| 17 | BUFFER SORT | | 1 | 12 | 41 | | |
| 18 | VIEW | MTC EXCPN CATEGORY CD V | 1 | 12 | 21 | | |
| 19 | SORT ORDER BY | | 1 | 91 | 21 | | |
|* 20 | TABLE ACCESS FULL | MTC_CD_LKUP | 1 | 91 | 5 | | |
| 21 | BUFFER SORT | | 1 | 20 | 61 | | |
| 22 | VIEW | MTC EXCPN NUM V | 1 | 20 | 21 | | |
| 23 | SORT ORDER BY | | 1 | 91 | 21 | | |
|* 24 | TABLE ACCESS FULL | MTC_CD_LKUP | 1 | 91 | 5 | | |
| 25 | BUFFER SORT | | 22 | 2948 | 82 | | |
| 26 | VIEW | MTC EXCPN CURRENT STATUS V | 22 | 2948 | 21 | | |
| 27 | SORT ORDER BY | | 22 | 2002 | 21 | | |
|* 28 | FILTER | | | | | | |
|* 29 | TABLE ACCESS FULL | MTC_CD_LKUP | 22 | 2002 | 5 | | |
| 30 | TABLE ACCESS BY LOCAL INDEX ROWID| MTC_BLNG_EXCEPTION_DTL_ODS | 1056 | 65472 | 179 | 62 | 62 |
|* 31 | INDEX RANGE SCAN | BLNG_EXCPN_CMP_INS_TMST_LO_IDX | 38019 | | 123 | 62 | 62 |
--------------------------------------------------------------------------------------------------------------------------I wonder, why Oracle didn't feed rowids immediately to table after doing Index range scan in First query, like it did in second query ??
Thanks.
. . . E t c . . .
First query finished in 243 s with FULL table scan when NO Index was there on table.
When I created a local prefixed index, it took around 2000 s with following plan. Please note at bottom step #24 its doing Index range scan, then in #3, its > accessing table using Index rowid. Performance has degraded USING INDEX. I wonder WHY Oracle did not choose FULL scan ?
. . . E t c . . .
If performance degraded, remove the local prefixed index.
Besides it seems not to be the same statement, the second query has an additional view: "MTC EXCPN CURRENT STATUS V "
:p
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