best practices: add index best practices #20903
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| 与在单节点提供洞察的 `TIDB_INDEX_USAGE` 不同，提供集群级视图的 `CLUSTER_TIDB_INDEX_USAGE` 支持下列功能： | ||
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| - 检测索引使用不一致。例如，某索引在部分节点常用，其他节点未用。 | ||
| - 分析分布式查询的全局索引模式，确保索引决策反映实际负载分布。 | ||
| - 优化全节点索引策略，提升多节点部署下的查询效率。 |
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This section looks obscure to me. Shall we remove it?
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Co-authored-by: Roger Song <roger.song@pingcap.com>
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[APPROVALNOTIFIER] This PR is APPROVED This pull-request has been approved by: hfxsd The full list of commands accepted by this bot can be found here. The pull request process is described here
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In response to a cherrypick label: new pull request created to branch |
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