databricks-lakebase

name	databricks-lakebase
description	Databricks Lakebase Postgres: projects, scaling, connectivity, Lakebase synced tables, and Data API. Use when asked about Lakebase databases, OLTP storage, or connecting apps to Postgres on Databricks.
compatibility	Requires databricks CLI (>= v0.294.0)
metadata	{"version":"0.1.0"}
parent	databricks-core

Lakebase Postgres Autoscaling

FIRST: Use the parent databricks-core skill for CLI basics, authentication, and profile selection.

Lakebase is Databricks' serverless Postgres-compatible database, available on both AWS and Azure (GA). It provides fully managed OLTP storage with autoscaling, branching, and scale-to-zero.

Autoscaling by Default (March 2026): All new Lakebase instances are Autoscaling projects. The /database/ APIs now create autoscaling instances behind the scenes. Existing provisioned instances are unchanged.

Compliance: Supports HIPAA, C5, TISAX, or None.

Capabilities

• Project lifecycle -- create, update, delete Lakebase Postgres Autoscaling projects
• Branching -- copy-on-write branches with TTL, point-in-time recovery, and reset
• Compute scaling -- autoscale 0.5--32 CU, fixed 36--112 CU, scale-to-zero
• High availability -- 1 primary + 1--3 secondaries, automatic failover
• PostgreSQL connectivity -- OAuth token refresh, connection pooling, SSL
• Data API -- PostgREST-compatible HTTP CRUD (Autoscaling only)
• Lakebase synced tables -- sync Unity Catalog Delta tables into Postgres (previously known as Reverse ETL)
• Databricks App integration -- scaffold apps with Lakebase feature, deploy-first workflow
• Cloud support -- AWS and Azure (GA)

Reference docs:

• computes-and-scaling.md — Sizing, endpoint management, scale-to-zero, HA
• connectivity.md — Connection patterns, token refresh, Data API
• synced-tables.md — Lakebase synced tables, data type mapping, capacity planning
• lakehouse-sync.md — CDC from Lakebase Postgres to Unity Catalog Delta tables (UI-only — cannot be configured via CLI or API)
• pgvector.md — Vector similarity search with pgvector extension
• off-platform.md — Off-platform Lakebase (NOT Databricks Apps): external Node.js apps connecting via @databricks/lakebase, env management, token refresh, Drizzle ORM

Resource Hierarchy

Project (top-level container)
  └── Branch (isolated database environment, copy-on-write)
        ├── Endpoint (read-write or read-only)
        ├── Database (standard Postgres DB)
        └── Role (Postgres role)

• Project: Top-level container. Creating one auto-provisions a production branch and a primary read-write endpoint.
• Branch: Isolated database environment sharing storage with parent (copy-on-write). States: READY, ARCHIVED.
• Endpoint (called Compute in UI): Compute resource powering a branch. Types: ENDPOINT_TYPE_READ_WRITE, ENDPOINT_TYPE_READ_ONLY.
• Database: Standard Postgres database within a branch. Default: databricks_postgres.
• Role: Postgres role within a branch.

Resource Name Formats

Resource	Format
Project	projects/{project_id}
Branch	projects/{project_id}/branches/{branch_id}
Endpoint	projects/{project_id}/branches/{branch_id}/endpoints/{endpoint_id}
Database	projects/{project_id}/branches/{branch_id}/databases/{database_id}

All IDs: 1-63 characters, start with lowercase letter, lowercase letters/numbers/hyphens only (RFC 1123).

CLI Discovery -- ALWAYS Do This First

Note: "Lakebase" is the product name; the CLI command group is postgres. All commands use databricks postgres ....

Do NOT guess command syntax. Discover available commands dynamically:

databricks postgres -h                    # List all subcommands
databricks postgres <subcommand> -h       # Flags, args, JSON fields

Create a Project

Do NOT list projects before creating.

databricks postgres create-project <PROJECT_ID> \
  --json '{"spec": {"display_name": "<DISPLAY_NAME>"}}' \
  --profile <PROFILE>

Auto-creates: production branch + primary read-write endpoint (1 CU min/max, scale-to-zero). Long-running operation; CLI waits by default. Use --no-wait to return immediately.

After creation, verify:

databricks postgres list-branches projects/<PROJECT_ID> --profile <PROFILE>
databricks postgres list-endpoints projects/<PROJECT_ID>/branches/<BRANCH_ID> --profile <PROFILE>
databricks postgres list-databases projects/<PROJECT_ID>/branches/<BRANCH_ID> --profile <PROFILE>

Extract connection values from JSON output:

Value	JSON path	Used for
Endpoint host	status.hosts.host	PGHOST, lakebase.postgres.host
Endpoint resource path	name	LAKEBASE_ENDPOINT, lakebase.postgres.endpointPath
Database resource path	name	lakebase.postgres.database
PostgreSQL database name	status.postgres_database	PGDATABASE, lakebase.postgres.databaseName

Updating a Project

databricks postgres update-project projects/<PROJECT_ID> spec.display_name \
  --json '{"spec": {"display_name": "My Updated Application"}}' \
  --profile <PROFILE>

Deleting a Project

WARNING: Permanent -- deletes all branches, computes, databases, roles, and data. Do not delete without explicit user permission.

databricks postgres delete-project projects/<PROJECT_ID> --profile <PROFILE>

Autoscaling

Endpoints use compute units (CU) (~2 GB RAM per CU). Range: 0.5--32 CU (dynamic), 36--112 CU (fixed). Scale-to-zero enabled by default (5 min timeout).

See computes-and-scaling.md for sizing tables, endpoint CRUD, and configuration details.

Branches

Branches are copy-on-write snapshots. Use for testing schema migrations, trying queries, or previewing data changes without affecting production.

databricks postgres create-branch projects/<PROJECT_ID> <BRANCH_ID> \
  --json '{"spec": {"source_branch": "projects/<PROJECT_ID>/branches/<SOURCE>", "no_expiry": true}}' \
  --profile <PROFILE>

Branches require an expiration policy: "no_expiry": true for permanent, or "ttl": "<seconds>s" (max 30 days).

Limits: 10 unarchived branches per project. 8 TB logical data per branch. 1,000 projects per workspace.

Use Case	TTL
CI/CD environments	2--4 hours ("ttl": "14400s")
Demos	24--48 hours ("ttl": "172800s")
Feature development	1--7 days ("ttl": "604800s")
Long-term testing	Up to 30 days ("ttl": "2592000s")

Point-in-time branching: Create from a past state (within restore window) for recovery. Run databricks postgres create-branch -h for time specification fields.

Reset: Replaces branch data with latest from parent. Local changes are lost. Root branches and branches with children cannot be reset.

databricks postgres reset-branch projects/<PROJECT_ID>/branches/<BRANCH_ID> --profile <PROFILE>

Delete: Protected branches must be unprotected first (update-branch to set spec.is_protected to false). Cannot delete branches with children. Never delete the production branch.

Key Differences from Lakebase Provisioned

All new instances default to Autoscaling as of March 2026. Automatic migration of Provisioned instances begins June 2026.

Aspect	Provisioned	Autoscaling
CLI group	databricks database	databricks postgres
Top-level resource	Instance	Project
Capacity	CU_1--CU_8 (16 GB/CU)	0.5--112 CU (2 GB/CU)
Branching	Not supported	Full support
Scale-to-zero	Not supported	Configurable
HA	Readable secondaries	1--3 secondaries + read replicas
Data API	Not available	PostgREST HTTP API
Cloud	AWS only	AWS and Azure

Migration: Manual via pg_dump/pg_restore (requires pausing writes). Automatic seamless upgrades (seconds of downtime) begin June 2026 -- no customer action required.

What's Next

Build a Databricks App

After creating a project, scaffold a connected Databricks App:

# 1. Get branch name
databricks postgres list-branches projects/<PROJECT_ID> --profile <PROFILE>

# 2. Get database name
databricks postgres list-databases projects/<PROJECT_ID>/branches/<BRANCH_ID> --profile <PROFILE>

# 3. Scaffold with lakebase feature
databricks apps init --name <APP_NAME> --features lakebase \
  --set "lakebase.postgres.branch=<BRANCH_NAME>" \
  --set "lakebase.postgres.database=<DATABASE_NAME>" \
  --run none --profile <PROFILE>

For the full app workflow, use the databricks-apps skill.

Schema Permissions for Deployed Apps

The app's Service Principal has CAN_CONNECT_AND_CREATE -- it can create new objects but cannot access existing schemas. The SP must create the schema to become its owner.

ALWAYS deploy the app before running it locally. This is the #1 source of Lakebase permission errors.

Correct workflow:

1. Deploy first: databricks apps deploy <APP_NAME> --profile <PROFILE>
2. Grant local access (if needed): assign databricks_superuser via UI (project creators already have access)
3. Develop locally: your credentials get DML access to SP-owned schemas

If you already ran locally first and hit permission denied: the schema is owned by your credentials, not the SP. Do NOT drop the schema without asking the user -- dropping it deletes all data.

Ask the user to choose:

• (A) Drop and redeploy: databricks psql --project <PROJECT_ID> -- -c "DROP SCHEMA IF EXISTS <SCHEMA_NAME> CASCADE;", then databricks apps deploy from the app directory. The SP recreates the schema on startup.
• (B) Export first, then drop and redeploy: export via pg_dump (use connection details from databricks postgres get-endpoint; see Other Workflows below for HOST and TOKEN) or copy tables to a temp schema using databricks psql --project <PROJECT_ID>, then do option A. After the SP recreates the schema on redeploy, restore with pg_restore or re-INSERT from the temp schema.

Other Workflows

# Connect a Postgres client -- get connection string
databricks postgres get-endpoint projects/<PROJECT_ID>/branches/<BRANCH_ID>/endpoints/<ENDPOINT_ID> --profile <PROFILE>

# Manage roles
databricks postgres create-role -h

# Add a read replica
databricks postgres create-endpoint projects/<PROJECT_ID>/branches/<BRANCH_ID> <ENDPOINT_ID> \
  --json '{"spec": {"type": "ENDPOINT_TYPE_READ_ONLY"}}' --profile <PROFILE>

Run SQL against Lakebase (GRANT, CREATE INDEX, etc.):

# 1. Get endpoint host
databricks postgres get-endpoint projects/<PROJECT_ID>/branches/<BRANCH_ID>/endpoints/<ENDPOINT_ID> --profile <PROFILE>

# 2. Generate OAuth token
databricks postgres generate-database-credential \
  projects/<PROJECT_ID>/branches/<BRANCH_ID>/endpoints/<ENDPOINT_ID> \
  --profile <PROFILE>

# 3. Connect (use token from step 2 as password, host from step 1)
PGPASSWORD='<TOKEN>' psql "host=<HOST> user=<USERNAME> dbname=databricks_postgres sslmode=require"

Note: generate-database-credential requires the endpoint resource path (.../endpoints/<ENDPOINT_ID>), not a database or branch path.

Scriptable version (single copy-paste, useful for agents):

EP=projects/<PROJECT_ID>/branches/<BRANCH_ID>/endpoints/<ENDPOINT_ID>
# get-endpoint JSON shape: {"status": {"hosts": {"host": "<HOSTNAME>"}, ...}, ...}
HOST=$(databricks postgres get-endpoint $EP --profile <PROFILE> -o json \
  | python3 -c "import json,sys; print(json.load(sys.stdin)['status']['hosts']['host'])")
TOKEN=$(databricks postgres generate-database-credential $EP --profile <PROFILE> -o json \
  | python3 -c "import json,sys; print(json.load(sys.stdin)['token'])")
PGPASSWORD="$TOKEN" psql "host=$HOST user=<USERNAME> dbname=databricks_postgres sslmode=require"

Grant app SP access to synced tables (run as project owner after sync is ONLINE and app is deployed):

GRANT USAGE ON SCHEMA public TO "<SP_CLIENT_ID>";
GRANT SELECT ON ALL TABLES IN SCHEMA public TO "<SP_CLIENT_ID>";
ALTER DEFAULT PRIVILEGES IN SCHEMA public GRANT SELECT ON TABLES TO "<SP_CLIENT_ID>";

For least-privilege, consider syncing into a dedicated schema instead of public so the grant is scoped to synced data only.

Get SP client ID: databricks apps get <APP_NAME> --profile <PROFILE> → service_principal_client_id field.

Data API: PostgREST-compatible HTTP CRUD on Postgres tables. See connectivity.md. Synced Tables: Sync Delta tables into Lakebase. See synced-tables.md.

PostgreSQL Extensions

Lakebase supports PostgreSQL extensions (e.g., pgvector for vector embeddings, pg_stat_statements for query statistics). See the full list of supported extensions.

-- List available extensions
SELECT * FROM pg_available_extensions ORDER BY name;

-- Install an extension
CREATE EXTENSION IF NOT EXISTS <extension_name>;

For vector embeddings with pgvector, see pgvector.md.

Troubleshooting

Error	Solution
cannot configure default credentials	Use --profile flag or authenticate first
PERMISSION_DENIED	Check workspace permissions
permission denied for schema	Schema owned by another role. If app not yet deployed: deploy first so the SP creates and owns the schema. If deployed but hitting this error (dev ran locally first): warn user about data loss, offer to export first (pg_dump with connection details from databricks postgres get-endpoint, or temp schema copy via databricks psql), then DROP SCHEMA IF EXISTS <SCHEMA_NAME> CASCADE + redeploy.
Protected branch won't delete	update-branch to set spec.is_protected to false first
Long-running operation timeout	Use --no-wait and poll with get-operation
Token expired during long query	Tokens expire after 1 hour; implement refresh (see connectivity.md)
Connection refused after scale-to-zero	Compute wakes in ~100ms; implement retry logic
Branch deletion blocked	Delete child branches first
Autoscaling range too wide	Max - Min cannot exceed 16 CU
SSL required error	Always use sslmode=require
Update mask required	All update-* operations require specifying fields (see -h)
Connection closed after idle	24h idle timeout; max lifetime beyond 24h not guaranteed. Implement retry.
DNS resolution fails (macOS)	Python socket.getaddrinfo() fails with long hostnames. Use dig to resolve IP, pass via hostaddr param alongside host (for TLS SNI). See connectivity.md.
storage_catalog pipeline failure	new_pipeline_spec.storage_catalog must be a regular UC catalog, not the Lakebase catalog. DLT cannot write event logs to Postgres-backed schemas.
Synced table CDF error	Enable CDF on source: ALTER TABLE ... SET TBLPROPERTIES (delta.enableChangeDataFeed = true). Required for Triggered/Continuous modes.
Sync permissions error	Ensure USE CATALOG/USE SCHEMA on source table and CREATE TABLE in storage catalog
Synced table null bytes	Null bytes (0x00) in STRING/ARRAY/MAP/STRUCT columns cause sync failures. Sanitize source data: REPLACE(col, CAST(CHAR(0) AS STRING), '')
Synced table data modified	Only read queries, indexes, and DROP TABLE allowed on synced tables in Postgres. Modifications break sync pipeline.
DABs synced_database_tables with Autoscaling	Do NOT use — maps to the Provisioned API. Use databricks postgres create-synced-table CLI instead. DAB support for Autoscaling synced tables (postgres_synced_tables) is not yet available.

SDK and Version Requirements

Component	Minimum Version
Databricks CLI	>= v0.294.0
Databricks SDK for Python	>= 0.81.0 (for w.postgres module)
psycopg	2.x or 3.x (3.x recommended for async/pooling)
Postgres	16 or 17 (default: PG 17)