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statistics: mark NDV as deprecated and update variable scopes (#18318) #18319

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Aug 7, 2024
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statistics: mark NDV as deprecated and update variable scopes (#18318) #18319

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statistics: mark NDV as deprecated and update variable scopes
Oreoxmt Aug 7, 2024
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2 changes: 1 addition & 1 deletion sql-statements/sql-statement-show-stats-buckets.md
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Expand Up @@ -21,7 +21,7 @@ summary: TiDB 数据库中 SHOW STATS_BUCKETS 的使用概况。
| `Repeats` | 最大值的出现次数 |
| `Lower_bound` | 最小值 |
| `Upper_bound` | 最大值 |
| `Ndv` | 桶中不同值的数量。当 `tidb_analyze_version` = `1` 时，`Ndv` 总是 `0`，没有实际意义。 |
| `Ndv` | 桶中不同值的数量。该字段已废弃，其值由于不准确会始终显示为 `0`。 |

## 语法图

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2 changes: 1 addition & 1 deletion system-variables.md
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Expand Up @@ -967,7 +967,7 @@ MPP 是 TiFlash 引擎提供的分布式计算框架，允许节点之间的数

### `tidb_analyze_distsql_scan_concurrency` <span class="version-mark">从 v7.6.0 版本开始引入</span>

- 作用域：GLOBAL
- 作用域：SESSION | GLOBAL
- 是否持久化到集群：是
- 是否受 Hint [SET_VAR](/optimizer-hints.md#set_varvar_namevar_value) 控制：否
- 类型：整数型
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