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*: remove the limit on single column data size #13949

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Jun 21, 2023
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*: remove the limit on single column data size #13949

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44 changes: 40 additions & 4 deletions data-type-string.md
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Expand Up @@ -54,15 +54,33 @@ TINYTEXT [CHARACTER SET charset_name] [COLLATE collation_name]

### `MEDIUMTEXT` type

The `MEDIUMTEXT` type is similar to the [`TEXT` type](#text-type). The difference is that the maximum column length of `MEDIUMTEXT` is 16,777,215. But due to the [Limitation on a single column in TiDB](/tidb-limitations.md#limitation-on-a-single-column), the maximum storage size of a single column in TiDB is 6 MiB by default and can be increased to 120 MiB by changing the configuration.
<CustomContent platform="tidb">

The `MEDIUMTEXT` type is similar to the [`TEXT` type](#text-type). The difference is that the maximum column length of `MEDIUMTEXT` is 16,777,215. But due to the limitation of [`txn-entry-size-limit`](/tidb-configuration-file.md#txn-entry-size-limit-new-in-v50), the maximum storage size of a single row in TiDB is 6 MiB by default and can be increased to 120 MiB by changing the configuration.

</CustomContent>
<CustomContent platform="tidb-cloud">

The `MEDIUMTEXT` type is similar to the [`TEXT` type](#text-type). The difference is that the maximum column length of `MEDIUMTEXT` is 16,777,215. But due to the limitation of [`txn-entry-size-limit`](https://docs.pingcap.com/tidb/stable/tidb-configuration-file#txn-entry-size-limit-new-in-v50), the maximum storage size of a single row in TiDB is 6 MiB by default and can be increased to 120 MiB by changing the configuration.

</CustomContent>

```sql
MEDIUMTEXT [CHARACTER SET charset_name] [COLLATE collation_name]
```

### `LONGTEXT` type

The `LONGTEXT` type is similar to the [`TEXT` type](#text-type). The difference is that the maximum column length of `LONGTEXT` is 4,294,967,295. But due to the [Limitation on a single column in TiDB](/tidb-limitations.md#limitation-on-a-single-column), the maximum storage size of a single column in TiDB is 6 MiB by default and can be increased to 120 MiB by changing the configuration.
<CustomContent platform="tidb">

The `LONGTEXT` type is similar to the [`TEXT` type](#text-type). The difference is that the maximum column length of `LONGTEXT` is 4,294,967,295. But due to the limitation of [`txn-entry-size-limit`](/tidb-configuration-file.md#txn-entry-size-limit-new-in-v50), the maximum storage size of a single row in TiDB is 6 MiB by default and can be increased to 120 MiB by changing the configuration.

</CustomContent>
<CustomContent platform="tidb-cloud">

The `LONGTEXT` type is similar to the [`TEXT` type](#text-type). The difference is that the maximum column length of `LONGTEXT` is 4,294,967,295. But due to the limitation of [`txn-entry-size-limit`](https://docs.pingcap.com/tidb/stable/tidb-configuration-file#txn-entry-size-limit-new-in-v50), the maximum storage size of a single row in TiDB is 6 MiB by default and can be increased to 120 MiB by changing the configuration.

</CustomContent>

```sql
LONGTEXT [CHARACTER SET charset_name] [COLLATE collation_name]
Expand Down Expand Up @@ -102,15 +120,33 @@ TINYBLOB

### `MEDIUMBLOB` type

The `MEDIUMBLOB` type is similar to the [`BLOB` type](#blob-type). The difference is that the maximum column length of `MEDIUMBLOB` is 16,777,215. But due to the [Limitation on a single column in TiDB](/tidb-limitations.md#limitation-on-a-single-column), the maximum storage size of a single column in TiDB is 6 MiB by default and can be increased to 120 MiB by changing the configuration.
<CustomContent platform="tidb">

The `MEDIUMBLOB` type is similar to the [`BLOB` type](#blob-type). The difference is that the maximum column length of `MEDIUMBLOB` is 16,777,215. But due to the limitation of [`txn-entry-size-limit`](/tidb-configuration-file.md#txn-entry-size-limit-new-in-v50), the maximum storage size of a single row in TiDB is 6 MiB by default and can be increased to 120 MiB by changing the configuration.

</CustomContent>
<CustomContent platform="tidb-cloud">

The `MEDIUMBLOB` type is similar to the [`BLOB` type](#blob-type). The difference is that the maximum column length of `MEDIUMBLOB` is 16,777,215. But due to the limitation of [`txn-entry-size-limit`](https://docs.pingcap.com/tidb/stable/tidb-configuration-file#txn-entry-size-limit-new-in-v50), the maximum storage size of a single row in TiDB is 6 MiB by default and can be increased to 120 MiB by changing the configuration.

</CustomContent>

```sql
MEDIUMBLOB
```

### `LONGBLOB` type

The `LONGBLOB` type is similar to the [`BLOB` type](#blob-type). The difference is that the maximum column length of `LONGBLOB` is 4,294,967,295. But due to the [Limitation on a single column in TiDB](/tidb-limitations.md#limitation-on-a-single-column), the maximum storage size of a single column in TiDB is 6 MiB by default and can be increased to 120 MiB by changing the configuration.
<CustomContent platform="tidb">

The `LONGBLOB` type is similar to the [`BLOB` type](#blob-type). The difference is that the maximum column length of `LONGBLOB` is 4,294,967,295. But due to the limitation of [`txn-entry-size-limit`](/tidb-configuration-file.md#txn-entry-size-limit-new-in-v50), the maximum storage size of a single row in TiDB is 6 MiB by default and can be increased to 120 MiB by changing the configuration.

</CustomContent>
<CustomContent platform="tidb-cloud">

The `LONGBLOB` type is similar to the [`BLOB` type](#blob-type). The difference is that the maximum column length of `LONGBLOB` is 4,294,967,295. But due to the limitation of [`txn-entry-size-limit`](https://docs.pingcap.com/tidb/stable/tidb-configuration-file#txn-entry-size-limit-new-in-v50), the maximum storage size of a single row in TiDB is 6 MiB by default and can be increased to 120 MiB by changing the configuration.

</CustomContent>

```sql
LONGBLOB
Expand Down
12 changes: 0 additions & 12 deletions tidb-limitations.md
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Expand Up @@ -63,18 +63,6 @@ You can adjust the size limit via the [`txn-entry-size-limit`](/tidb-configurati

</CustomContent>

## Limitation on a single column

| Type | Upper limit (default value) |
|:----------|:----------|
| Size | Defaults to 6 MiB and can be adjusted to 120 MiB |

<CustomContent platform="tidb">

You can adjust the size limit via the [`txn-entry-size-limit`](/tidb-configuration-file.md#txn-entry-size-limit-new-in-v50) configuration item.

</CustomContent>

## Limitations on data types

| Type | Upper limit |
Expand Down