To sync different sets of data to each user, data is organized into buckets.

Each user can sync a number of buckets (up to 1,000), and each bucket defines a set of tables/collections and rows/documents to sync.

This is defined using two queries:

  1. Select bucket parameters from a user ID and/or other parameters (parameter queries)

  2. Select data in the bucket using the bucket parameters (data queries)

When designing your buckets, it is recommended, but not required, to group all data in a bucket where the same parameters apply.

An example:

bucket_definitions:
  user_lists:
    # Optionally define the priority of the bucket to sync certain buckets before others
    priority: 1 # See https://docs.powersync.com/usage/use-case-examples/prioritized-sync  
    # Select parameters for the bucket, using the current user_id
    parameters: SELECT request.user_id() as user_id # (request.user_id() comes from the JWT token)  
    data:
      # Select data rows/documents using the parameters above
      - SELECT * FROM lists WHERE owner_id = bucket.user_id

Note:

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