This query works in SQL Server. In MySQL and PostgreSQL, we need to add the word RECURSIVE after the WITH keyword. This will work in MySQL 8.0 when the WITH clause was introduced, but not in earlier versions. You can also use the HierarchyID data type in SQL Server when working with hi...
Because we’ve separated the compute nodes containing the query engine from the storage, they’re effectively stateless, meaning you can lose a compute node without endangering any data at all. It also means that you can scale the compute resources up or down without moving any data,...
Meaning, certain rows in a database table based on the user executing the query (group membership or execution context) are hidden. The access restriction is done on the database tier instead of in an application tier, to simplify your app logic. You start by creating a filter predicate, ...
The second section indicates that Joe has granted read access to PUBLIC (a special pseudo-role meaning everyone), while the third section shows that the Sales Team has been given INSERT, SELECT, and UPDATE privileges, also by Joe. Privilege flags in ACLs can vary significantly de...
The table name and column names are helpful to interpret the meaning of values in each row. The data are represented as a set of relations. In the relational model, data are stored as tables. However, the physical storage of the data is independent of the way the data are logically organ...
DBCC CHECKDB reads only allocated pages (meaning pages that are currently in use). In your case, I'm guessing that the rest of the nightly maintenance job includes index rebuilds or reorganizing—both of which can drastically alter the set of pages that are allocated to a particular object ...
SQL databases' implementation of relations varies a little but are mostly a combination of two different underlying data structures: theheap fileandb-trees. Consequently the operation times are generally logarithmic - meaning that they grow slowly as the size of the data-set grows. ...
In theConfigure Database Connectiondialog box, underServer Information, in theServer Namebox, type the name of the server where your database resides. In theProvider Namebox, do one of the following: If you are connecting to an external Microsoft SQL Server database, clickMicrosoft .NET Framew...
Traversing relationships within the graph structure is highly efficient, allowing for fast and scalable questions that explore connections and patterns in the data. Scalability–Graph databases are designed to scale horizontally, meaning they can handle large and growing datasets by distributing them ...
meaning any transactions that need to be rolled forward will be, and any transactions that are incomplete will be rolled back. Therefore, the database is consistent from a data point to the time of the failure or manual failover, hence no data loss. Databases are only available after recover...