Spanner release notes

Dynamic channel pooling (DCP) for gRPC channels in the Spanner Go and Java client libraries is generally available (GA).

DCP prevents performance issues from under-provisioned or over-provisioned channels and reduces configuration overhead. DCP is disabled by default.

For more information, see Configure the number of sessions and gRPC channels in the pools.

Spanner supports creating tables without defining primary keys. When you create a table without a primary key, Spanner creates a hidden rowid column that serves as the primary key. For more information, see Create a table without defining a primary key.

You can use Gemini in Spanner Studio to fix errors in your SQL queries. When you run a query that contains an error, you can click Fix to view a line-by-line comparison of your query and a recommended correction, along with an explanation of the change. This feature is available in Preview.

Spanner supports direct connectivity. When enabled, your application traffic is routed directly to Spanner servers, bypassing the Google Front End (GFE) servers. This can reduce your overall latency. Direct connectivity is generally available (GA).

You can publish a Spanner conversational analytics agent in Gemini Enterprise. This feature is in Preview.

Spanner Graph supports a suite of graph algorithms covering use cases such as fraud detection, entity resolution, and recommendations. You can invoke graph algorithms as built-in function calls in Spanner Graph queries. You can save your output to Cloud Storage or Spanner. This feature is available in Preview.

You can optimize Spanner Graph query performance by using factorized execution. If a graph pattern traversal generates duplicate intermediate results, add the @{factorize_mode} hint to the pattern traversal or at the query level to optimize the query.

For more information, see Use factorized execution to optimize queries.

Spanner Studio supports query parameters, which let you bind literal values to a templated SQL statement at query time in the Google Cloud console. For more information, see query parameters.

Spanner supports the FACTORIZED_MODE join hint. You can control which sides of a join to factorize (deduplicate) before executing the join by using the FACTORIZE_LEFT, FACTORIZE_RIGHT, or FACTORIZE_BOTH hint values. For more information, see Factorized mode.

The Spanner change streams default retention period has been increased from 1 day to 7 days. This change affects both new and existing change streams that don't have a retention period explicitly set. You can always specify the retention period through create change stream or alter change stream DDL statements to override the default.

You can populate new PostgreSQL dialect databases in an existing Spanner instance from sample datasets that help you explore Spanner capabilities.

For more information, see Create and manage databases.

Spanner vector index and approximate nearest neighbor (ANN) distance functions are generally available (GA) for PostgreSQL databases.

Spanner full-text search supports custom dictionaries to create custom synonym mappings. You can use custom dictionaries with the SEARCH, SCORE, and SNIPPET functions.

The Spanner remote MCP server is generally available (GA). The Spanner remote MCP server lets you interact with Spanner instances from LLMs, AI applications, and AI-enabled development platforms.

You can use the Database Insights remote MCP server to analyze Spanner's performance and system metrics. This feature is generally available (GA).

You can now use Spanner Studio to visually create and manage a Spanner Graph schema. Visual modeling simplifies graph design by enabling you to map nodes and edges through an intuitive interface instead of creating manual DDL statements. This feature is available in Preview.

Repeatable read isolation is generally available. You can use it to reduce latency and transaction failure rates for workloads that have many reads contending with fewer writes. For more information, see Repeatable read isolation.

Spanner supports Gemini Cloud Assist investigation capabilities. You can create, run, and edit Gemini Cloud Assist investigations only if you have a Premium support contract.

For more information, see monitor and troubleshoot your Spanner instance with AI assistance.

Columnar engine for Spanner is now generally available (GA). Columnar engine is a storage technique used with analytical queries to make scans up to 200 times faster on live operational data without affecting transaction workloads. This release enables support for Columnar Engine in databases that use the Postgres interface.

For more information, see the Columnar engine for Spanner overview.

Spanner supports importing data from Cloud SQL for MySQL. This feature lets you migrate the schema and perform a one-time bulk data load to evaluate Spanner for your use case. For more information, see Import from Cloud SQL to Spanner.

This feature is generally available.

The QueryData tool lets you to query the data in your database using conversational language and build data agents. For more information, see QueryData tool overview. This feature is available in (Preview).

The preview release increases the accuracy of SQL generation with value search queries which match values and their context within a database. Value search queries trigger automatically.

Spanner offers conversational analytics, which lets users query their operational data using natural language. This feature is powered by the Conversational Analytics API, which can help you translate complex human dialog into precise database queries to provide actionable insights. This feature is in Preview. For more information, see Conversational analytics for Spanner overview.

You can create BigQuery non-incremental materialized views over Spanner data to improve query performance by periodically caching results. This feature is generally available (GA).

You can use Cloud resource connections with EXPORT DATA statements to reverse ETL (extract, transform, load) BigQuery data to Spanner. This feature is generally available (GA).

The Spark Spanner connector supports writing a Spark Dataframe to a Spanner table using the Spark data source API. For more information, see Use the Spark Spanner connector.

Spanner now offers AI functions, as a part of machine learning functions, that help you perform semantic operations using Large Language Models (LLMs) in SQL to classify, evaluate, and rank your data:

• AI.CLASSIFY: Classify a natural language input into user-defined categories.
• AI.IF: Evaluate a condition described in natural language.
• AI.SCORE: Rate natural language input and assign it a score.

Spanner supports the optimistic concurrency control mode. Optimistic concurrency control is suitable for transactional workloads with low read-write contention. It assumes that conflicts in transactions are rare. Reads and queries within a read-write transaction proceed without acquiring locks. For more information, see Concurrency control.

You can use continuous queries to stream BigQuery data to Spanner in real time. This feature is generally available (GA).

Spanner supports the ON CONFLICT clause for GoogleSQL INSERT statements to handle unique constraint violations. For more information, see ON CONFLICT DO NOTHING and ON CONFLICT DO UPDATE.

Spanner supports using the pending commit timestamp function as a default value and an ON UPDATE expression for column definitions. For more information, see the GoogleSQL ON UPDATE clause and the PostgreSQL ON UPDATE clause.

Spanner provides JSON string versions of the following statistics columns for PostgreSQL-dialect databases:

• TOTAL_LATENCY_DISTRIBUTION_JSON_STRING in Transaction statistics
• OPERATIONS_BY_TABLE_JSON_STRING in Transaction statistics
• LATENCY_DISTRIBUTION_JSON_STRING in Query statistics
• SAMPLE_LOCK_REQUESTS_JSON_STRING in Lock statistics

You can use these columns to retrieve statistics in JSON format from the SPANNER_SYS tables.

Spanner supports the following:

• Monitor the usage of Enterprise edition and Enterprise Plus edition features in your Spanner instance.
• Downgrade the instance's edition using the Google Cloud console.
• Verify edition compatibility when restoring from a backup. If the database uses higher-tier features, you must restore the backup to a destination instance that uses the same or a higher-tier edition.
• Set custom edition constraints within your organization policies, limiting the edition of your instance that your users can create.

Spanner supports the following managed autoscaler features:

• Autoscaling based on total CPU utilization target. When an instance's total CPU utilization exceeds or falls below the target that you have set, Spanner adds or removes compute capacity.
• Autoscaling for instance partitions (in Preview).

For more information, see Managed autoscaler.

Spanner provides UNSPLITTABLE_REASONS in hotspot insights and split statistics views to detect when splits can't be split further. Unsplittable reasons can help you identify schema anti-patterns that require intervention. For more information, see Find hotspots in your database and Split statistics.

This feature is generally available (GA).

Control of MCP use with organization policies is deprecated. After March 17, 2026, organization policies that use the gcp.managed.allowedMCPServices constraint won't work, and you can control MCP use with IAM deny policies.

For more information about controlling MCP use, see Control MCP use with IAM.

After March 17, 2026, when you enable Spanner, the Spanner MCP server is automatically enabled.

New best practices are available for securing generative AI agents using Model Context Protocol (MCP) with Google Cloud databases. This guide covers key security measures like least privilege, native database controls, and secure agent design to help you build safer AI applications. For more information, see Best practices for securing agent interactions with Model Context Protocol.

This feature is in Preview.

You can use the Spanner remote MCP server to interact with Spanner instances and databases from agentic AI applications such as Gemini CLI, agent mode in Gemini Code Assist, or Claude.ai.

This feature is in Preview.

You can right-click a node in a Spanner Graph query visualization to access options like expanding or collapsing adjacent nodes, highlighting or hiding nodes, and viewing only a node's neighbors.

For more information, see Work with visualizations.

You can create and host remote functions in Cloud Run and call them from Spanner queries using the GoogleSQL dialect. This feature is in Preview.

Spanner supports the UUID data type for both GoogleSQL and PostgreSQL-dialect databases. This data type stores universally unique identifiers (UUIDs) as 128-bit values.

You can use the GoogleSQL NEW_UUID() function or the PostgreSQL gen_random_uuid() to function to create UUID values.

For more information, see Use a universally unique identifier (UUID).

Spanner supports the following compression functions:

• ZSTD_COMPRESS
• ZSTD_DECOMPRESS_TO_BYTES
• ZSTD_DECOMPRESS_TO_STRING

These functions use the Zstandard (Zstd) lossless data compression algorithm to compress and decompress STRING or BYTES values. For more information, see Compression functions.

Columnar engine for Spanner is now in Public Preview. Columnar engine is a storage technique used with analytical queries to speed up scans up to 200 times faster on live operational data without affecting transaction workloads. In databases or tables enabled with columnar engine, this release:

• Supports the ability to execute columnar queries automatically and perform faster columnar scans using vectorized execution.
• Provides a new major compaction API to accelerate the conversion of non-columnar data into columnar data.

For more information, see the Columnar engine for Spanner overview.

You can create Spanner regional instance configurations in Bangkok, Thailand (asia-southeast3). For more information, see Google Cloud locations and Spanner pricing.

Several updates have been made to full-text search:

• Named schemas support full-text search.
• Spanner search indexes can accelerate pattern matching expressions such as LIKE, STARTS_WITH, and ENDS_WITH for pattern matching, and REGEXP_CONTAINS for regular expression matching.
• TOKENIZE_FULLTEXT has an argument for removing diacritics. SEARCH and SCORE use this if the data was tokenized with this option.
• TOKENIZE_SUBSTRING supports emojis.

You can use SQL views to create a graph. For requirements, considerations, and the benefits of using SQL views to create a graph, see Overview of graphs created from SQL views. To learn how to create a graph from views, see Create a property graph from SQL views.

The GoogleSQL function ELEMENT_DEFINITION_NAME is available. ELEMENT_DEFINITION_NAME returns the name of the graph element table underlying a graph element.

You can build data agents that interact with the data in your database using conversational language. Use these data agents as tools to empower your applications. For more information, see Data agents overview. This feature is available in Preview, and access to it requires a sign-up.

Spanner supports the PostgreSQL generate_series() function. You can use this function to create a sequence of numbers. For more information, see Set returning functions.

Spanner Data Boost includes a the Data Boost concurrent requests in milli-operations per second per region quota, which applies fine-grained control over how multiple concurrent requests for your project share Data Boost resources. Instead of counting 1 request against 1 unit of quota under the existing concurrency quota regime, Data Boost splits a request at a granularity of 1/1000, allowing for a greater number of concurrent requests to make progress. For more information, see Quotas and limits.

Spanner Graph supports using the ANY CHEAPEST path search prefix in a query to return the path with the lowest total compute cost. For more information, see Path search prefix in the Spanner Graph Language reference.

Spanner supports the following new columns in the SPANNER_SYS oldest active queries table:

• CLIENT_IP_ADDRESS
• API_CLIENT_HEADER
• USER_AGENT_HEADER
• SERVER_REGION
• PRIORITY
• TRANSACTION_TYPE

You can also view these columns in the Spanner query insights page on the Google Cloud console. For more information, see Monitor active queries.

String values in Spanner Studio query results are enclosed in double quotes, providing a visual cue to differentiate string values from other data types. This enhancement is for display purposes only and doesn't affect how data is exported or accessed.

Query optimizer version 8 is the default version for Spanner.

The GoogleSQL function IS_FIRST is available for graph queries. IS_FIRST returns true if a row is in the first k rows (1-based) within a window. You can use IS_FIRST in graph queries to limit traversed edges to improve query performance. You can also use IS_FIRST to sample intermediate nodes to optimize multi-hop queries.

Spanner Studio added support for several export options for your query results. You can export to a CSV or JSON file, Google Sheets, or copy the results to a clipboard. For more information, see Create, modify, and query your data.

Spanner automatically provides recommendations to apply schema design best practices to your databases. You can view these schema issue recommendations on the Spanner Studio page for your database. For more information, see View schema design best practice recommendations. This feature is in Preview.

A monthly digest of client library updates from across the Google Cloud SDK.

Named schemas are supported in Spanner Graph. For more information, see Spanner Graph schema overview.

Schema object drop protection is generally available. This feature protects schema objects such as tables, indexes, and columns from accidental deletion.

You can use the GoogleSQL ML.PREDICT function to convert your natural language query text into an embedding and perform approximate nearest neighbors (ANN) vector search.

You can use repeatable read isolation (in Preview) to reduce latency and transaction abort rates for workloads that have many reads contending with fewer writes. For more information, see Repeatable read isolation.

The Spanner CLI is generally available. Bundled with Google Cloud CLI, you can use the Spanner command-line interface to open an interactive session or automate SQL executions from the shell or an input file.

A monthly digest of client library updates from across the Google Cloud SDK.