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system variables.md: add a warning message (#6298) #6313

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Aug 27, 2021
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system variables.md: add a warning message (#6298) #6313

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10 changes: 9 additions & 1 deletion system-variables.md
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Expand Up @@ -513,9 +513,13 @@ Constraint checking is always performed in place for pessimistic transactions (d

### tidb_enable_cascades_planner

> **Warning:**
>
> Currently, cascades planner is an experimental feature. It is not recommended that you use it in the production environment.

- Scope: SESSION | GLOBAL
- Default value: `OFF`
- This variable is used to control whether to enable the cascades planner, which is currently considered experimental.
- This variable is used to control whether to enable the cascades planner.

### tidb_enable_chunk_rpc <span class="version-mark">New in v4.0</span>

Expand Down Expand Up @@ -552,6 +556,10 @@ Constraint checking is always performed in place for pessimistic transactions (d

### tidb_enable_fast_analyze

> **Warning:**
>
> Currently, `Fast Analyze` is an experimental feature. It is not recommended that you use it in the production environment.

- Scope: SESSION | GLOBAL
- Default value: `OFF`
- This variable is used to set whether to enable the statistics `Fast Analyze` feature.
Expand Down