A constraint is a rule in a relational database that you create to make sure that data stored in a table adheres to specific standards that you set, such as always making sure there is a value in a particular column, or that the data in a column has to be unique from all other val...
Object storage integration SQL Server 2022 (16.x) introduces new object storage integration to the data platform, enabling you to integrate SQL Server with S3-compatible object storage, in addition to Azure Storage. The first is backup to URL and the second is Data Lake Virtualization.Data Lake...
This constraint makes sure that no matter what, a column cannot have a NULL value. By default, columns can hold NULL values. A sample of using NOT NULL in modifying an existing tables rules, is below. Please note that a NOT NULL value is not the same as no data, is just means that...
As part of the schema synchronization procedure performed when starting, an SQL node now compares all databases on the cluster's data nodes with those in its own data dictionary, and if any of these is found to be missing from the SQL node's data dictionary, the SQL Node installs it loc...
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For details and examples, see ADD SENSITIVITY CLASSIFICATION.High availabilityOne common task that everyone who deploys SQL Server has to account for is making sure that all mission critical SQL Server instances and the databases within them are available whenever the business and end users need ...
After triggers are run after a DML action, such as an INSERT statement and any ensuing referential cascade actions and constraint checks have run. You can’t cancel the database action using an AFTER trigger. This is because the action has already completed. ...
This behavior is on by default in all databases (including tempdb) starting with SQL Server 2019 (15.x). Scheduler worker migration Worker migration allows an idle scheduler to migrate a worker from the runnable queue of another scheduler on the same NUMA node and immediately resume the task ...
concurrent object allocation threads. This improvement changes the way that concurrency is managed with PFS updates so that they can be updated under a shared latch, rather than an exclusive latch. This behavior is on by default in all databases (includingtempdb) starting with SQL Server 2019 (...
ADD CHECK (id<>10); GO ALTER TABLE PARENT2 ADD CONSTRAINT DF_PARENT2 DEFAULT 0 FOR ID; GO Wait for SQL Server replication sync. Now go to the subscriber and check for the newly created constraints. We can see the new constraints got replicated to the subscribers. Now let us drop the...