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mysql-schema: add information about several missing system tables (#20409) #20444

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Merged
merged 2 commits into from
Mar 4, 2025
Merged

mysql-schema: add information about several missing system tables (#20409) #20444

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f26ff56
This is an automated cherry-pick of #20409
time-and-fate Mar 4, 2025
97de5cd
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 @@ -43,6 +43,9 @@ Currently, the `help_topic` is NULL.
- `stats_extended`: extended statistics, such as the order correlation between columns
- `stats_feedback`: the query feedback of statistics
- `stats_fm_sketch`: the FMSketch distribution of the histogram of the statistics column
- `stats_table_locked`: information about the locked statistics
- `stats_meta_history`: the meta information in the historical statistics
- `stats_history`: the other information in the historical statistics
- `analyze_options`: the default `analyze` options for each table
- `column_stats_usage`: the usage of column statistics
- `schema_index_usage`: the usage of indexes
Expand All @@ -53,6 +56,11 @@ Currently, the `help_topic` is NULL.
- `bind_info`: the binding information of execution plans
- `capture_plan_baselines_blacklist`: the blocklist for the automatic binding of the execution plan

## System tables related to PLAN REPLAYER

- `plan_replayer_status`: the [`PLAN REPLAYER CAPTURE`](https://docs.pingcap.com/tidb/stable/sql-plan-replayer#use-plan-replayer-capture) tasks registered by the user
- `plan_replayer_task`: the results of [`PLAN REPLAYER CAPTURE`](https://docs.pingcap.com/tidb/stable/sql-plan-replayer#use-plan-replayer-capture) tasks

## GC worker system tables

> **Note:**
Expand Down Expand Up @@ -93,3 +101,4 @@ Currently, the `help_topic` is NULL.
- `expr_pushdown_blacklist`: the blocklist for expression pushdown
- `opt_rule_blacklist`: the blocklist for logical optimization rules
- `tidb_timers`: the metadata of internal timers
- `advisory_locks`: information related to [Locking functions](/functions-and-operators/locking-functions.md)