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YDBDOCS-1571-CHANGE-DESCRIPTION #30593

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YDBDOCS-1571-CHANGE-DESCRIPTION
Dec 12, 2025
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Change if
Dec 12, 2025
7a5dbd9
fix syntax
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fix links
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close condition block
Dec 15, 2025
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16 changes: 11 additions & 5 deletions ydb/docs/en/core/yql/reference/syntax/pragma.md
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Expand Up @@ -429,17 +429,25 @@ SELECT $foo;
{% endif %}


{% if tech %}
{% if backend_name == "YDB" %}

## YDB

### `ydb.CostBasedOptimization` {#costbasedoptimization}

| Value | Description |
| ------- | ---------------------- |
| on | Cost optimizer is enabled for the current query |
| off | Cost optimizer is disabled for the current query |
| auto | The cost optimizer works in accordance with the current [CostBasedOptimizationLevel](#costbasedoptimizationlevel) level |

### `ydb.CostBasedOptimizationLevel` {#costbasedoptimizationlevel}

| Level | Description |
| ----- | ------------------------ |
| 0 | Cost-based optimizer is disabled. |
| 1 | Cost-based optimizer is disabled, but estimates are computed and available. |
| 2 | Cost-based optimizer is enabled only for queries that include [column-oriented tables](../concepts/glossary.md#column-oriented-table). |
| 2 | Cost-based optimizer is enabled only for queries that include {% if backend_name == "YDB" and oss == true %}[column-oriented tables](../../../concepts/glossary.md#column-oriented-table-column-oriented-table) {% else %} column-oriented tables.{% endif %} |
| 3 | Cost-based optimizer is enabled for all queries, but `LookupJoin` is preferred for row-oriented tables. |
| 4 | Cost-based optimizer is enabled for all queries. |

Expand All @@ -453,8 +461,6 @@ An experimental pragma that allows you to reduce the isolation level of the curr

{% endif %}



{% if tech %}

## Debugging and auxiliary settings {#debug}
Expand All @@ -467,7 +473,7 @@ An experimental pragma that allows you to reduce the isolation level of the curr
| --- | --- |
| Flag | false |

An auxiliary setting for previewing tables in the [HTTP API](../interfaces/http.md) (both for the web interface and console client).
An auxiliary setting for previewing tables in the [HTTP API](../) (both for the web interface and console client).
{% endif %}

### `config.flags("ValidateUdf", "Lazy")`
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2 changes: 1 addition & 1 deletion ydb/docs/ru/core/yql/reference/syntax/pragma.md
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Expand Up @@ -470,7 +470,7 @@ SELECT $foo;

| Значение | Поведение оптимизатора |
| ------- | ---------------------- |
| on | Cтоимостный оптимизатор выключен для текущего запроса |
| on | Cтоимостный оптимизатор включен для текущего запроса |
| off | Cтоимостный оптимизатор выключен для текущего запроса |
| auto | Cтоимостный оптимизатор работает в соотвествии с текущем уровнем [CostBasedOptimizationLevel](#costbasedoptimizationlevel) |

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