add doc for schema cache #18646
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add doc for schema cache #18646
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Signed-off-by: wjhuang2016 <[email protected]>
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Signed-off-by: wjhuang2016 <[email protected]>
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Signed-off-by: wjhuang2016 <[email protected]>
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| - 可以通过观测 TiDB 监控中 Schema load 下的子面板 Infoschema v2 Cache Operation 来查看 schema 缓存的命中率。如果命中率较低，可以调大 [`tidb_schema_cache_size`](/system-variables.md#tidb_schema_cache_size-从-v800-版本开始引入)。 | ||
| - 可以通过观测 TiDB 监控中 Schema load 下的子面板 Infoschema v2 Cache Size 来查看当前使用的 schema 缓存的大小。 |
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感觉不需要，用户如果熟悉监控的话也能找到
Co-authored-by: fzzf678 <[email protected]>
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Co-authored-by: xixirangrang <[email protected]>
Co-authored-by: xixirangrang <[email protected]>
Co-authored-by: xixirangrang <[email protected]>
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| - 可以通过观测 TiDB 监控中 Schema load 下的子面板 Infoschema v2 Cache Operation 来查看 schema 缓存的命中率。如果命中率较低，可以调大 [`tidb_schema_cache_size`](/system-variables.md#tidb_schema_cache_size-从-v800-版本开始引入)。 | ||
| - 可以通过观测 TiDB 监控中 Schema load 下的子面板 Infoschema v2 Cache Size 来查看当前使用的 schema 缓存的大小。 | ||
| - 建议关闭 [`performance.force-init-stats`](/tidb-configuration-file.md#force-init-stats-从-v657-和-v710-版本开始引入) 以减少 TiDB 的启动时间。 | ||
| - 建议关闭 [`split-table`](/tidb-configuration-file.md#split-table) 以减少 region 数量，从而降低 TiKV 的内存。 |
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建议加上场景“如果需要创建大量的表（例如 10 万张以上），建议将此参数设置为 false”
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| ## 已知限制 | ||
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| 在大量数据库和表的场景下，有以下已知问题： |
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这个是开启 schema cache v2 后在大量数据库和表的场景下的限制么？看的像，但是又不像，比如这一条“TiDB 的启动时间会变长。开启 schema 缓存能够缓解该问题。”
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这个算是大量库表下的问题，也不完全是限制
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