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---
title: "Spanner (PostgreSQL dialect)"
type: docs
description: "Details of the Spanner (PostgreSQL dialect) prebuilt configuration."
---
## Spanner (PostgreSQL dialect)
* `--prebuilt` value: `spanner-postgres`
* **Environment Variables:**
* `SPANNER_PROJECT`: The GCP project ID.
* `SPANNER_INSTANCE`: The Spanner instance ID.
* `SPANNER_DATABASE`: The Spanner database ID.
* **Permissions:**
* **Cloud Spanner Database Reader** (`roles/spanner.databaseReader`) to
execute DQL queries and list tables.
* **Cloud Spanner Database User** (`roles/spanner.databaseUser`) to
execute DML queries.
* **Tools:**
* `execute_sql`: Executes a DML SQL query using the PostgreSQL interface
for Spanner.
* `execute_sql_dql`: Executes a DQL SQL query using the PostgreSQL
interface for Spanner.
* `list_tables`: Lists tables in the database.
* `search_catalog`: Searches for data assets in Knowledge Catalog (Dataplex).