Ingestion

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Events and streaming data

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Data warehouses and data lakes

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Databases

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ELT / ETL Platforms

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Understanding Data Pools

Data Pools are ClickHouse tables with an ingestion pipeline from a data source.

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Understanding event-based Data Pools

Event-based data sources like the Webhook Data Pool collect and write events into Data Pools. These Data Pools have a very simple schema:

Column	Type	Description
_propel_received_at	TIMESTAMP	The timestamp when the event was collected in UTC.
_propel_payload	JSON	The JSON Payload of the event

During the setup of a Webhook Data Pool, you can optionally unpack top-level or nested keys from the incoming JSON event into specific columns. See the Webhook Data Pool for more details.

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Understanding data warehouse and data lake-based Data Pools

Data warehouses and data lake-based Data Pools, such as Snowflake or Amazon S3 Parquet, synchronize records at a given interval from the source table and write them into Data Pools. You can create multiple Data Pools, one for each table.

Data warehouses and data lake-based Data Pools also offer additional properties that enable you to control their synchronization behavior. These include:

• Scheduled Syncs: A Data Pool’s sync interval determines how often Propel checks for new data to synchronize. For near real-time applications, the interval can be as short as 1 minute, while for applications with more relaxed data freshness requirements, it can be set to once a day or anything in between.
• Manually triggered Syncs: Syncs can be triggered on-demand when a Data Pool’s underlying data source has changed, or in order to re-sync the Data Pool from scratch.
• Pausing and resuming syncing: Controls whether a Data Pool syncs data or not. When paused, Propel stops synchronizing records to your Data Pool. When resumed, it will start syncing on the configured interval.

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Frequently asked questions