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mysql-schema: add information about several missing system tables (#19944) #19976

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Merged
merged 3 commits into from
Mar 4, 2025
Merged

mysql-schema: add information about several missing system tables (#19944) #19976

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ea135b7
This is an automated cherry-pick of #19944
time-and-fate Mar 4, 2025
55384dc
resolve conflict
Oreoxmt Mar 4, 2025
bc03124
Apply suggestions from code review
Oreoxmt Mar 4, 2025
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9 changes: 9 additions & 0 deletions mysql-schema.md
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Expand Up @@ -34,6 +34,9 @@ summary: 了解 TiDB 系统表。
* `stats_extended` 扩展统计信息，比如列之间的顺序相关性
* `stats_feedback` 统计信息的查询反馈
* `stats_fm_sketch` 统计信息列的直方图 FMSketch 分布
* `stats_table_locked` 被锁定的统计信息
* `stats_meta_history` 历史统计信息中的元信息部分
* `stats_history` 历史统计信息中的其它部分
* `analyze_options` 各个表默认的 `analyze` 参数
* `column_stats_usage` 列统计信息的使用情况
* `schema_index_usage` 索引的使用情况
Expand All @@ -44,6 +47,11 @@ summary: 了解 TiDB 系统表。
* `bind_info` 执行计划的绑定信息
* `capture_plan_baselines_blacklist` 关于自动绑定执行计划对象的黑名单

## PLAN REPLAYER 相关系统表

* `plan_replayer_status` 存储用户注册的 [`PLAN REPLAYER CAPTURE`](/sql-plan-replayer.md#使用-plan-replayer-capture-功能) 抓取任务
* `plan_replayer_task` 存储 [`PLAN REPLAYER CAPTURE`](/sql-plan-replayer.md#使用-plan-replayer-capture-功能) 抓取结果

## GC Worker 相关系统表

* `gc_delete_range` 需要被 GC worker 定期删除的 KV 范围段
Expand Down Expand Up @@ -71,3 +79,4 @@ summary: 了解 TiDB 系统表。
* `expr_pushdown_blacklist` 表达式下推的黑名单
* `opt_rule_blacklist` 逻辑优化规则的黑名单
* `table_cache_meta` 缓存表的信息
* `advisory_locks` 存储[锁函数](/functions-and-operators/locking-functions.md)相关的信息
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