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TomShawn merged 5 commits into from
Oct 12, 2020
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*: remove expression index out of experimental feature #4034

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*: remove expression index out of experimental feature
Joyinqin Oct 12, 2020
54248e9
Merge branch 'master' into create-index
Joyinqin Oct 12, 2020
b153ab4
Update tidb-configuration-file.md
Joyinqin Oct 12, 2020
79b4fbc
Merge branch 'create-index' of https://github.com/Joyinqin/docs into …
Joyinqin Oct 12, 2020
6d0c3b0
Update tidb-configuration-file.md
TomShawn Oct 12, 2020
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12 changes: 0 additions & 12 deletions sql-statements/sql-statement-create-index.md
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Expand Up @@ -111,18 +111,6 @@ Query OK, 0 rows affected (0.31 sec)

## Expression index

> **Warning:**
>
> Expression index is still an experimental feature. It is **NOT** recommended that you use it in the production environment.

To use this feature, make the following setting in [TiDB Configuration File](/tidb-configuration-file.md#allow-expression-index-new-in-v400):

{{< copyable "sql" >}}

```sql
allow-expression-index = true
```

TiDB can build indexes not only on one or more columns in a table, but also on an expression. When queries involve expressions, expression indexes can speed up those queries.

Take the following query as an example:
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13 changes: 1 addition & 12 deletions tidb-configuration-file.md
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Expand Up @@ -558,15 +558,4 @@ For pessimistic transaction usage, refer to [TiDB Pessimistic Transaction Mode](

## experimental

The `experimental` section describes configurations related to the experimental features of TiDB. This section is introduced since v3.1.0.

### `allow-auto-random` <span class="version-mark">New in v3.1.0</span>

- Determines whether to allow using `AUTO_RANDOM`.
- Default value: `false`
- By default, TiDB does not support using `AUTO_RANDOM`. When the value is `true`, you cannot set `alter-primary-key` to `true` at the same time.

### `allow-expression-index` <span class="version-mark">New in v4.0.0</span>

- Determines whether to create the expression index.
- Default value: `false`
The `experimental` section, introduced in v3.1.0, describes configurations related to the experimental features of TiDB. Currently, this section has no configuration item.