From bd69750b15a713d405b2632723e97365a357b968 Mon Sep 17 00:00:00 2001 From: toutdesuite Date: Thu, 9 Apr 2020 14:16:29 +0800 Subject: [PATCH 1/2] specify index name --- reference/performance/optimizer-hints.md | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/reference/performance/optimizer-hints.md b/reference/performance/optimizer-hints.md index a501d9b2536dd..3c968235c46a3 100644 --- a/reference/performance/optimizer-hints.md +++ b/reference/performance/optimizer-hints.md @@ -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 index is `primary`. + ### NO_INDEX_MERGE() The `NO_INDEX_MERGE()` hint disables the index merge feature of the optimizer. From 25480fa2eb897d6850fb2ec030e7ee68888e1a40 Mon Sep 17 00:00:00 2001 From: toutdesuite Date: Thu, 9 Apr 2020 14:20:16 +0800 Subject: [PATCH 2/2] delete repetition --- reference/performance/optimizer-hints.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/reference/performance/optimizer-hints.md b/reference/performance/optimizer-hints.md index 3c968235c46a3..f75b4399e0a50 100644 --- a/reference/performance/optimizer-hints.md +++ b/reference/performance/optimizer-hints.md @@ -192,7 +192,7 @@ select /*+ USE_INDEX_MERGE(t1, idx_a, idx_b, idx_c) */ * from t t1 where t1.a > > **Note:** > -> The parameters of `USE_INDEX_MERGE` refer to index names, rather than column names. The index name of the primary key index is `primary`. +> 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()