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reference/performance: specify index name of primary key for USE_INDEX_MERGE #2221

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sre-bot merged 3 commits into from
Apr 9, 2020
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reference/performance: specify index name of primary key for USE_INDEX_MERGE #2221

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bd69750
specify index name
toutdesuite Apr 9, 2020
25480fa
delete repetition
toutdesuite Apr 9, 2020
bc4c69f
Merge branch 'master' into specify-index-name
sre-bot Apr 9, 2020
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4 changes: 4 additions & 0 deletions reference/performance/optimizer-hints.md
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Expand Up @@ -190,6 +190,10 @@ The `USE_INDEX_MERGE(t1_name, idx1_name [, idx2_name ...])` hint tells the optim
select /*+ USE_INDEX_MERGE(t1, idx_a, idx_b, idx_c) */ * from t t1 where t1.a > 10 or t1.b > 10;
```

> **Note:**
>
> The parameters of `USE_INDEX_MERGE` refer to index names, rather than column names. The index name of the primary key is `primary`.

### NO_INDEX_MERGE()

The `NO_INDEX_MERGE()` hint disables the index merge feature of the optimizer.
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