Brent Ozar Unlimited - SQL Server Consulting and Training. Come on down and join Brent in person, plus get access to a recorded version of the class that you can revisit later to reinforce what you learned. What's New in SQL Server 2. Database Engine)THIS TOPIC APPLIES TO: SQL Server (starting with 2. Azure SQL Database. Azure SQL Data Warehouse Parallel Data Warehouse. This topic summarizes the enhancements introduced in the SQL Server 2. SQL Server Database Engine. Try it out. To download SQL Server 2. Use PowerShell to gather server-level information for your SQL Server inventory. Here's how to use full-text search in SQL Server when querying exact SQL expressions or phrases that include symbols. Search symbols in SQL with these steps. I have a relatively large table (currently 2 million records) and would like to know if it's possible to improve performance for ad-hoc queries. The word ad-hoc being. Evaluation Center. Have an Azure account? For the current release notes, see SQL Server 2. Release Notes. SQL Server 2. Service Pack 1 (SP1)CREATE OR ALTER < object> syntax is now available for procedures, views, functions, and triggers. Support for a more generic query hinting model has been added: OPTION (USE HINT('< hint. For more information, see Query Hints (Transact- SQL). We have been asked to reduce our maintenance window for the SQL Server off-line index rebuilds and updating statistics in order to keep our systems online longer. You may ask the obvious question – why the range lock is required? The reason is the way how SQL Server handles modifications of the data. The data is always. When SQL Server auto-updates statistics. For more details on when, generally, SQL Server will automatically update statistics objects, see my article, Understanding.This includes adding row- level security, Always Encrypted, dynamic data masking, database auditing, in- memory OLTP and several other features to all editions. For more information see Editions and Supported Features for SQL Server 2. The configuration settings affect application behavior. The new statement is available in both SQL Server 2. SQL Database. In- Memory OLTPStorage format change. The storage format for memory- optimized tables is changed between SQL Server 2. For upgrade and attach/restore from SQL Server 2. ALTER TABLE is log- optimized, and runs in parallel. Now when you execute an ALTER TABLE statement on a memory- optimized table, only the metadata changes are written to the log. This greatly reduces log IO. Also, most ALTER TABLE scenarios now run in parallel, which can greatly shorten the duration of the statement. Statistics. Statistics for memory- optimized tables are now updated automatically. In addition, sampling is now a supported method to collect statistics, allowing you to avoid the more expensive fullscan method. Parallel and heap scan for memory- optimized tables. Memory- optimized tables, and indexes on memory- optimized tables, now support parallel scan. This improves the performance of analytical queries. In addition, heap scan is supported, and can be performed in parallel. In the case of a memory- optimized table, a heap scan refers to scanning all the rows in a table using the in- memory heap data structure used for storing the rows. For a full table scan, heap scan is more efficient than using an index. Transact- SQL Improvements for memory- optimized tables. There are several Transact- SQL elements that were not supported for memory- optimized tables in SQL Server 2. SQL Server 2. 01. UNIQUE constraints and indexes are supported. FOREIGN KEY references between memory- optimized tables are supported. These foreign keys can reference only a primary key, and cannot reference a unique key. CHECK constraints are supported. A non- unique index can allow NULL values in its key. TRIGGERs are supported on memory- optimized tables. Only AFTER triggers are supported. INSTEADOF triggers are not supported. Any trigger on a memory- optimized table must use WITH NATIVE. Change bucket. An example is a table that has three columns of type nvarchar(4. In such examples, some columns are now stored off- row. Your queries are blissfully unaware of whether a column is on- row or off- row. LOB (large object) typesvarbinary(max), nvarchar(max), and varchar(max) are now supported in memory- optimized tables. For overall information, see: Transact- SQL Improvements for natively compiled modules. There are some Transact- SQL elements that were not supported for natively compiled modules in SQL Server 2. SQL Server 2. 01. Query constructs: UNION and UNION ALLSELECT DISTINCTOUTER JOINSubqueries in SELECTINSERT, UPDATE and DELETE statements can now include the OUTPUT clause. LOBs can now be used in the following ways in a native proc: Declaration of variables. Input parameters received. Parameters passed into string functions, such as into LTrim or Substring, in a native proc. Inline (meaning single statement) table- valued functions (TVFs) can now be natively compiled. Scalar user- defined functions (UDFs) can now be natively compiled. Increased support for a native proc to call: EXECUTE AS CALLER is now support, which means the EXECUTE AS clause is no longer required when creating a natively compiled T- SQL module. For overall information, see: Performance and scaling improvements. Enhancements in SQL Server Management Studio. Cross- feature support. For more information, see In- Memory OLTP (In- Memory Optimization). Query Optimizer. Compatibility Level Guarantees. When you upgrade your database to SQL Server 2. New features and improvements related to query optimizer, will be available only under latest compatibility level. Trace Flag 4. 19. In general, you do not need to use trace flag 4. SQL Server 2. 01. SQL Server 2. 01. New Referential Integrity Operator. A table can reference a maximum of 2. For restrictions, see Create Foreign Key Relationships. A new referential integrity operator is introduced (under compatibility level 1. This improves overall performance for UPDATE and DELETE operations, on tables that have a large number of incoming references, thereby making it feasible to have large number of incoming references. For more information, see Query Optimizer Additions in SQL Server 2. Parallel update of sampled statistics. Data sampling to build statistics is now done in parallel (under compatibility level 1. For more information, see Update Statistics. Sublinear threshold for update of statistics. Automatic update of statistics is now more aggressive on large tables (under compatibility level 1. The threshold to trigger auto- update of statistics is 2. SQL Server 2. 01. You will no longer need to set trace flag 2. Other enhancements. The Insert in an Insert- select statement is multi- threaded or can have a parallel plan (under compatibility level 1. To get a parallel plan, INSERT . For more information, see Parallel Insert Select Live Query Statistics Management Studio provides the ability to view the live execution plan of an active query. This live query plan provides real- time insights into the query execution process as the controls flow from one query plan operator to another. For more information, see Live Query Statistics. Query Store. Query store is a new feature that provides DBAs with insight on query plan choice and performance. It simplifies performance troubleshooting by enabling you to quickly find performance differences caused by changes in query plans. The feature automatically captures a history of queries, plans, and runtime statistics, and retains these for your review. It separates data by time windows, allowing you to see database usage patterns and understand when query plan changes happened on the server. The query store presents information by using a Management Studio dialog box, and lets you force the query to one of the selected query plans. For more information, see Monitoring Performance By Using the Query Store. Temporal Tables SQL Server 2. A temporal table is a new type of table that provides correct information about stored facts at any point in time. Each temporal table consists of two tables actually, one for the current data and one for the historical data. The system ensures that when the data changes in the table with the current data the previous values are stored in the historical table. Querying constructs are provided to hide this complexity from users. For more information, see Temporal Tables. Striped Backups to Microsoft Azure Blob Storage. In SQL Server 2. 01. SQL Server backup to URL using the Microsoft Azure Blob storage service now supports striped backups sets using block blobs to support a maximum backup size of 1. TB. For examples, see Code Examples. File- Snapshot Backups to Microsoft Azure Blob Storage In SQL Server 2. SQL Server backup to URL now supports using Azure snapshots to backup databases in which all database files are stored using the Microsoft Azure Blob storage service. For more information, see File- Snapshot Backups for Database Files in Azure. Managed Backup. In SQL Server 2. SQL Server Managed Backup to Microsoft Azure uses the new block blob storage for backup files. There are also several changes and enhancements to Managed Backup. Support for both automated and custom scheduling of backups. Support backups for system databases. Support for databases that are using the Simple recovery model. For more information, see SQL Server Managed Backup to Microsoft Azure. Note For SQL Server 2. UI support in SQL Server Management Studio. Temp. DB Database There are several enhancements to Temp. DB: Trace Flags 1. If there are multiple tempdb database files all files will grow at the same time depending on growth settings. In addition, all allocations in tempdb will use uniform extents. By default, setup adds as many tempdb files as the CPU count or 8, whichever is lower. During setup, you can configure the number of tempdb database files, initial size, autogrowth and directory placement using the new UI input control on the Database Engine Configuration - Temp. DB section of SQL Server Installation Wizard. The default initial size is 8. MB and the default autogrowth is 6. MB. You can specify multiple volumes for tempdb database files. If multiple directories are specified tempdb data files will be spread across the directories in a round- robin fashion. Built- in JSON Support. SQL Server 2. 01. JSON and working with JSON strings. This built- in support includes the following statements and functions. Format query results as JSON, or export JSON, by adding the FOR JSON clause to a SELECT statement. Use the FOR JSON clause, for example, to delegate the formatting of JSON output from your client applications to SQL Server. For more info, see Format Query Results as JSON with FOR JSON (SQL Server). Convert JSON data to rows and columns, or import JSON, by calling the OPENJSON rowset provider function. Use OPENJSON to import JSON data into SQL Server, or convert JSON data to rows and columns for an app or service that can't currently consume JSON directly. For more info, see Convert JSON Data to Rows and Columns with OPENJSON (SQL Server).
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