---
title: Fact Load Strategy (Dataflow)
description: Fact Load Strategy (FactLoadStrategy) decides whether the loader of a Fact or Mart Fact empties the table before it inserts the source rows.
---

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# Fact Load Strategy (Dataflow)

**Applies to**  
Platform: Microsoft SQL Server · Snowflake · Databricks · Databricks dbt · Fabric Lakehouse · Fabric Warehouse · Oracle  
Architecture: Dimensional · Data Mart

Fact Load Strategy (`FactLoadStrategy`) decides whether the loader of a Fact or Mart Fact empties the table before it inserts the source rows. It is the only load setting of these types: their Implementation Type is fixed to `FactLoadStrategy`.

### Where to set it

Set the property when you [edit a dataflow](https://knowledge.bigenius-x.com/edit-a-data-flow?hsLang=en) of a [Fact](https://knowledge.bigenius-x.com/create-a-fact?hsLang=en) or a [Mart Fact](https://knowledge.bigenius-x.com/create-a-mart-fact?hsLang=en).

### Values and default

- `Truncate Insert` (default): the TruncateInsertLoader empties the table and inserts all rows of the source view.
- `Insert`: the InsertLoader inserts rows into the table and keeps the existing rows.

Select one value per dataflow. With both values, validation reports a warning ([One Fact Load Strategy selected (Business Rule)](https://knowledge.bigenius-x.com/one-fact-load-strategy-selected-business-rule?hsLang=en)), and the generator creates both loaders. With no value, validation reports an error ([Fact Load Strategy selected (Business Rule)](https://knowledge.bigenius-x.com/fact-load-strategy-selected-business-rule?hsLang=en)).

### Effect on generated output

A Mart Fact with `Insert` and a mapped [BG\_IncrementalFilter](https://knowledge.bigenius-x.com/bg_incrementalfilter?hsLang=en) gets an increment table. Each load then reads only the source rows whose `BG_IncrementalFilter` is above the value stored by the previous load. When a Mart Fact with `Insert` has no incremental load, validation reports a warning ([Fact Load Strategy Insert needs Incremental selected (Business Rule)](https://knowledge.bigenius-x.com/fact-load-strategy-insert-needs-incremental-selected-business-rule?hsLang=en)). [Configure an incremental load](https://knowledge.bigenius-x.com/configure-an-incremental-load?hsLang=en) describes the increment.

### Example

A Mart Fact on Microsoft SQL Server with `Truncate Insert`. Its loader contains, shortened:

```
TRUNCATE TABLE [<schema>].[DM_MF_load_truncate_insert_..._timestamp];
INSERT
INTO [<schema>].[DM_MF_load_truncate_insert_..._timestamp]
    WITH(TABLOCK) (
    ...
FROM [<schema>].[DM_MF_load_truncate_insert_..._timestamp_Lkp]
    AS [BG_Source]
```

With `Insert`, the loader is named `DM_MF_<model object name>_InsertLoader` and has no `TRUNCATE TABLE`.

### Related articles

- Reference: [Implementation Type (Model Object)](https://knowledge.bigenius-x.com/implementation-type-model-object?hsLang=en), [BG\_IncrementalFilter](https://knowledge.bigenius-x.com/bg_incrementalfilter?hsLang=en), [One Fact Load Strategy selected (Business Rule)](https://knowledge.bigenius-x.com/one-fact-load-strategy-selected-business-rule?hsLang=en), [Fact Load Strategy selected (Business Rule)](https://knowledge.bigenius-x.com/fact-load-strategy-selected-business-rule?hsLang=en)
- See also: [Fact](https://knowledge.bigenius-x.com/create-a-fact?hsLang=en), [Mart Fact](https://knowledge.bigenius-x.com/create-a-mart-fact?hsLang=en), [Configure an incremental load](https://knowledge.bigenius-x.com/configure-an-incremental-load?hsLang=en)

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