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‎docs/includes/applies-to-version/sqlserver2022-asdb-asdbmi-asa-svrless-poolonly.md‎

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---
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author: WilliamDAssafMSFT
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ms.service: sql
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ms.topic: include
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ms.date: 04/09/2021
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ms.author: wiassaf
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---
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[!INCLUDE [Applies to](../../includes/applies-md.md)] [!INCLUDE [_ss2022](_ss2022.md)] [!INCLUDE [Azure SQL Database](../../includes/applies-to-version/_asdb.md)] [!INCLUDE [SQL Managed Instance](../../includes/applies-to-version/_asdbmi.md)] [!INCLUDE [Azure Synapse Analytics (serverless SQL pool only)](../../includes/applies-to-version/_asa-svrless-sqlpool-only.md)]

‎docs/sql-server/what-s-new-in-sql-server-2022.md‎

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|System page latch concurrency enhancements|- Concurrent update to global allocation map (GAM) pages and shared global allocation map (SGAM) pages reduces page latch contention while allocating/deallocating data pages and extents. <br/><br/>- Improvements on buffer pool scan by using parallel tasks. Learn more about [Operations that trigger a buffer pool scan may run slowly on large-memory computers](https://go.microsoft.com/fwlink/?linkid=2132602).|
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|Automatic Degree of parallelism (DOP) feedback | A new database scoped configuration option `DOP_FEEDBACK` automatically adjusts degree of parallelism for repeating queries to optimize for workloads where excessive parallelism can cause performance issues. Similar to optimizations in Azure SQL Database. Requires Query Store enabled. See [Configure the max degree of parallelism Server Configuration Option](../database-engine/configure-windows/configure-the-max-degree-of-parallelism-server-configuration-option.md).|
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| Cardinality estimation feedback | Identifies and corrects suboptimal query execution plans for repeating queries, when these issues are caused by incorrect estimation model assumptions. Requires Query Store enabled. See [Cardinality Estimation (SQL Server)](../relational-databases/performance/cardinality-estimation-sql-server.md). |
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| Optimized plan forcing| Uses compilation replay to improve the compilation time for forced plan generation by pre-caching non-repeatable plan compilation steps. Learn more in [Optimized plan forcing with Query Store](../relational-databases/performance/optimized-plan-forcing-query-store.md).|
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## Operations
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## Management
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| New feature or update | Details |
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|:---|:---|
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| Accelerated Database Recovery (ADR) improvement | There are several improvements to address persistent version store (PVS) storage and improve overall scalability. SQL Server 2022 implements a persistent version store cleaner thread per database instead of per instance and the memory footprint for PVS page tracker has been improved. There are also a number of ADR efficiencies. Concurrency improvements help the cleanup process to work more efficiently. ADR cleans pages that could not previously be cleaned due to locking.<br/><br/>See [Restore and Recovery Overview (SQL Server)](../relational-databases/backup-restore/restore-and-recovery-overview-sql-server.md#adr).|
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| Improved snapshot backup support | Adds Transact-SQL support for freezing and thawing I/O without requiring a VDI client.[Create a Transact-SQL snapshot backup](../relational-databases/backup-restore/create-a-transact-sql-snapshot-backup.md)|
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| Setup attached to Azure | Install Azure Arc agent via SQL Server command line setup. For more information, see [Install SQL Server from the Command Prompt](../database-engine/install-windows/install-sql-server-from-the-command-prompt.md#install-sql-server-from-the-command-prompt).|
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| Optimized plan forcing| Uses compilation replay to improve the compilation time for forced plan generation by pre-caching non-repeatable plan compilation steps. Learn more in [Optimized plan forcing with Query Store](../relational-databases/performance/optimized-plan-forcing-query-store.md).|
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| Shrink database wait with low priority | In previous releases, shrinking databases and database files to reclaim space often leads to concurrency issues. In SQL Server 2022 an additional option for DBCC SHRINKDATABASE and DBCC SHRINKFILE 'WAIT_AT_LOW_PRIORITY' changes the default behavior. When specifying WAIT_AT_LOW_PRIORITY behavior, new queries requiring Sch-S locks are not blocked by the waiting shrink operation, until the shrink operation stops waiting and begins executing.|
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| Setup attached to Azure | Install Azure Arc agent via SQL Server at setup. For more information, see [Install SQL Server from the Command Prompt](../database-engine/install-windows/install-sql-server-from-the-command-prompt.md#install-sql-server-from-the-command-prompt).|
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| Max server memory calculations | During setup, the installation will configure max server memory to align with recommendations. See [Server memory configuration options](../database-engine/configure-windows/server-memory-server-configuration-options.md). |
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| Backup and restore to S3 compatible object storage | SQL Server 2022 extends the `BACKUP`/`RESTORE` `TO`/`FROM` `URL` syntax by adding support for a new S3 connector using the REST API.|
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| Accelerated Database Recovery (ADR) improvement | There are several improvements to address persistent version store (PVS) storage and improve overall scalability. SQL Server 2022 implements a persistent version store cleaner thread per database instead of per instance and the memory footprint for PVS page tracker has been improved. There are also a number of ADR efficiencies. Concurrency improvements help the cleanup process to work more efficiently. ADR cleans pages that could not previously be cleaned due to locking.<br/><br/>See [Restore and Recovery Overview (SQL Server)](../relational-databases/backup-restore/restore-and-recovery-overview-sql-server.md#adr).|
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| Improved snapshot backup support | Adds Transact-SQL support for freezing and thawing I/O without requiring a VDI client. [Create a Transact-SQL snapshot backup](../relational-databases/backup-restore/create-a-transact-sql-snapshot-backup.md).|
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| Shrink database wait with low priority | In previous releases, shrinking databases and database files to reclaim space often leads to concurrency issues. In SQL Server 2022 an additional option for DBCC SHRINKDATABASE and DBCC SHRINKFILE 'WAIT_AT_LOW_PRIORITY' changes the default behavior. When specifying WAIT_AT_LOW_PRIORITY behavior, new queries requiring Sch-S locks are not blocked by the waiting shrink operation, until the shrink operation stops waiting and begins executing. See [WAIT_AT_LOW_PRIORITY](../relational-databases/databases/shrink-a-database.md#remarks).|
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| Backup and restore to S3 compatible object storage | SQL Server 2022 extends the `BACKUP`/`RESTORE` `TO`/`FROM` `URL` syntax by adding support for a new S3 connector using the REST API. See [backup to URL](../relational-databases/backup-restore/sql-server-backup-to-url-s3-compatible-object-storage.md).|
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## Language
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| Time series functions | You can store and analyze data that changes over time, using time-windowing, aggregation, and filtering capabilities.<br/>- [DATE_BUCKET](../t-sql/functions/date-bucket-transact-sql.md)<br/>- [GENERATE_SERIES](../t-sql/functions/generate-series-transact-sql.md)<br/><br/>The following adds support to IGNORE NULLS and RESPECT NULLS:<br/>- [FIRST_VALUE](../t-sql/functions/first-value-transact-sql.md)<br/>- [LAST_VALUE](../t-sql/functions/last-value-transact-sql.md)|
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| JSON functions | - [ISJSON (Transact-SQL)](../t-sql/functions/isjson-transact-sql.md)<br/>- [JSON_PATH_EXISTS (Transact-SQL)](../t-sql/functions/json-path-exists-transact-sql.md)<br/>- [JSON_OBJECT (Transact-SQL)](../t-sql/functions/json-object-transact-sql.md)<br/>- [JSON_ARRAY (Transact-SQL)](../t-sql/functions/json-array-transact-sql.md)|
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|SELECT ... WINDOW clause | Determines the partitioning and ordering of a rowset before the window function which uses the window in OVER clause is applied. See [SELECT (Transact-SQL)](../t-sql/queries/select-transact-sql.md).|
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| Resumable ALTER TABLE ADD CONSTRAINT | Support to pause, and resume a running ADD CONSTRAINT operation to perform it during maintenance windows. Resume such operation after failovers and system failures. Execute such operation on a large table despite the small log size available.
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| Resumable ALTER TABLE ADD CONSTRAINT | Support to pause, and resume a running ADD CONSTRAINT operation to perform it during maintenance windows. Resume such operation after failovers and system failures. Execute such operation on a large table despite the small log size available. See [ALTER TABLE (Transact-SQL)](../t-sql/statements/alter-table-transact-sql.md)|
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|T-SQL functions |- [GREATEST (Transact-SQL)](../t-sql/functions/logical-functions-greatest-transact-sql.md)<br/>- [LEAST (Transact-SQL)](../t-sql/functions/logical-functions-least-transact-sql.md)<br/>- [STRING_SPLIT (Transact-SQL)](../t-sql/functions/string-split-transact-sql.md).|
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## Tools

‎docs/t-sql/functions/logical-functions-greatest-transact-sql.md‎

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# Logical Functions - GREATEST (Transact-SQL)
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[!INCLUDE [sql-asdb-asdbmi-asa-svrless-poolonly](../../includes/applies-to-version/sql-asdb-asdbmi-asa-svrless-poolonly.md)]
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[!INCLUDE [sqlserver-2022-asdb-asdbmi-asa-svrless-poolonly](../../includes/applies-to-version/sqlserver2022-asdb-asdbmi-asa-svrless-poolonly.md)]
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This function returns the maximum value from a list of one or more expressions.

‎docs/t-sql/functions/logical-functions-least-transact-sql.md‎

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# Logical Functions - LEAST (Transact-SQL)
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[!INCLUDE [sql-asdb-asdbmi-asa-svrless-poolonly](../../includes/applies-to-version/sql-asdb-asdbmi-asa-svrless-poolonly.md)]
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[!INCLUDE [sqlserver-2022-asdb-asdbmi-asa-svrless-poolonly](../../includes/applies-to-version/sqlserver2022-asdb-asdbmi-asa-svrless-poolonly.md)]
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This function returns the minimum value from a list of one or more expressions.
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