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tidb-configuration-file: add more notes to txn-entry-size-limit (#12595) #12645

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Jan 12, 2023
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tidb-configuration-file: add more notes to txn-entry-size-limit (#12595) #12645

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2 changes: 1 addition & 1 deletion system-variables.md
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Expand Up @@ -1752,7 +1752,7 @@ v5.0 后，用户仍可以单独修改以上系统变量（会有废弃警告）
>
> * [go-sql-driver](https://github.com/go-sql-driver/mysql#multistatements) (`multiStatements`)
> * [Connector/J](https://dev.mysql.com/doc/connector-j/8.0/en/connector-j-reference-configuration-properties.html) (`allowMultiQueries`)
> * PHP [mysqli](https://dev.mysql.com/doc/apis-php/en/apis-php-mysqli.quickstart.multiple-statement.html) (`mysqli_multi_query`)
> * PHP [mysqli](https://www.php.net/manual/en/mysqli.quickstart.multiple-statement.php) (`mysqli_multi_query`)

### `tidb_enable_new_cost_interface`

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2 changes: 2 additions & 0 deletions tidb-configuration-file.md
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Expand Up @@ -357,6 +357,8 @@ TiDB 配置文件比命令行参数支持更多的选项。你可以在 [config/
+ 单位：Byte
+ 事务中单个 key-value 记录的大小限制。若超出该限制，TiDB 将会返回 `entry too large` 错误。该配置项的最大值不超过 `125829120`（表示 120MB）。
+ 注意，TiKV 有类似的限制。若单个写入请求的数据量大小超出 [`raft-entry-max-size`](/tikv-configuration-file.md#raft-entry-max-size)，默认为 8MB，TiKV 会拒绝处理该请求。当表的一行记录较大时，需要同时修改这两个配置。
+ [`max_allowed_packet`](/system-variables.md#max_allowed_packet-从-v610-版本开始引入) (MySQL 协议的最大数据包大小) 的默认值为 `67108864`（64 MiB）。如果一行记录的大小超过 `max_allowed_packet`，该行记录会被截断。
+ [`txn-total-size-limit`](#txn-total-size-limit)（TiDB 单个事务大小限制）的默认值为 100 MiB。如果将 `txn-entry-size-limit` 的值设置为 100 MiB 以上，需要相应地调大 `txn-total-size-limit` 的值。

### `txn-total-size-limit`

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14 changes: 7 additions & 7 deletions tidb-limitations.md
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Expand Up @@ -47,26 +47,26 @@ title: TiDB 使用限制

## 单行的限制

| 类型 | 最大限制 |
| 类型 | 最大限制（默认值） |
|:----------|:----------|
| Size | 默认为 6MB，可通过 [`txn-entry-size-limit`](/tidb-configuration-file.md#txn-entry-size-limit-从-v50-版本开始引入) 配置项调整 |
| Size | 默认为 6 MiB，可通过 [`txn-entry-size-limit`](/tidb-configuration-file.md#txn-entry-size-limit-从-v50-版本开始引入) 配置项调至 120 MiB |

## 单列的限制

| 类型 | 最大限制 |
| 类型 | 最大限制（默认值） |
|:----------|:----------|
| Size | 6MB |
| Size | 默认为 6 MiB，可通过 [`txn-entry-size-limit`](/tidb-configuration-file.md#txn-entry-size-limit-从-v50-版本开始引入) 配置项调至 120 MiB |

## 字符串类型限制
## 数据类型限制

| 类型 | 最大限制 |
|:----------|:----------|
| CHAR | 256 字符 |
| BINARY | 256 字节 |
| VARBINARY | 65535 字节 |
| VARCHAR | 16383 字符 |
| TEXT | 6MB 字节 |
| BLOB | 6MB 字节 |
| TEXT | 默认为 6291456 字节（即 6 MiB），可调至 125829120 字节（即 120 MiB） |
| BLOB | 默认为 6291456 字节（即 6 MiB），可调至 125829120 字节（即 120 MiB） |

## SQL Statements 的限制

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