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...
Virtual log file growthIn previous versions of SQL Server, if the next growth is more than 1/8 of the current log size, and the growth is less than 64MB, four VLFs were created. In SQL Server 2022 (16.x), this behavior is slightly different. Only one VLF is created if the growth ...
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 ...
To alter a table already created in MySQL, SQL Server, Oracle, or MS Access use the following SQL: ALTER TABLE Orders ADD FOREIGN KEY (P_Id) REFERENCES Persons(P_Id) CHECK Constraint The CHECK constraint ensures that all values in a column satisfy certain conditions. This is your checks ...
SQL is used to declare the data to be returned, and a SQL query processor and query optimizer turn the SQL declaration into a query plan that is executed by the database engine. SQL includes a sub-language for defining schemas, the data definition language (DDL), along with a sub-...
Since the data dictionary contains the definition of the database, it is a really good resource for you to use to gain information about the database. What I like is it contains information about tables and views. This makes it a great resource to look up information. In fact, this means...
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 ...
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. ...
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 (...