Read-only deal – A Multi-Version Concurrency Control (MVCC) feature that enables database information become read by one procedure without blocking another procedure’s modification of this data that are same. Often described as a “snapshot.”
Real-time – A real-time environment is one by which particular tasks should be going to perform within a specified time period. For a DBMS to be looked at really real-time, it should be in a position to perform particular database-related tasks in a period which can be deterministically demonstrated—i.e., the worst instance execution time could be demonstrated. Must be general-purpose DBMS http://datingmentor.org/germany-christian-dating/ relates to dynamic data where the sizes of tables vary in the long run, and since DBMS reaction times rely on the total amount of information become processed they can’t be looked at real-time. This is certainly real additionally for RDM. It’s real-time friendly, it to be used in beneficial ways in a real-time application because it is fast, has a small footprint and has features (such as virtual tables and in-memory storage) that allow.
Record Instance/Occurrence – One group of associated information industry values connected with a record that is specific to an SQL row.
Record Type – an accumulation closely associated information fields—equivalent to an SQL table. Just like a C struct, accurate documentation kind is defined by a collection of closely associated information areas.
Referential Integrity – a disorder where the international key column values in most for the rows within one dining dining dining table have actually matching rows when you look at the referenced primary key table. Referential integrity is maintained by SQL through the processing of a INSERT and DELETE declaration and any UPDATE statement that modifies a international or primary key value.
Relational Model – A database for which inter-table relationships are arranged mainly through common information columns, which define a one-to-many relationship between a line regarding the primary key dining table plus one or higher rows for the matching international key table. Equi-joins relate tables which have matching primary/foreign values that are key but other evaluations (relationships) might be defined. As well as explaining the way the database tables are associated, the model that is relational describes exactly how a associated data are accessed and manipulated. SQL is considered the most widely used relational model database language. See Wikipedia
Remote Procedure Phone – a technique of interprocess communication the place where a function living within another process is named as though it really is a nearby (in-process) function. The technique is implemented through a nearby proxy function and a stub function that is remote. Parameter values are marshalled in to a block of information that may be sent through the proxy to your stub for demarshalling and calling the real function. Return values are prepared when you look at the way that is same input values.
Replication – an activity where chosen changes in a master database is replicated re-played that is( into another database.
Regulation Factor – Each expression that is relational when you look at the WHERE clause of a question posseses an associated limitation factor that is predicted because of the SQL optimizer, which specifies the small fraction (or percentage) regarding the dining dining table which is why the expression may be real. As an example, into the query choose * from book where bookid = ‘austen013px’ the relational phrase bookid = ‘austen013px’ includes a limitation factor add up to .003 (only 1 away from 3213px rows will satisfy this expression).
Result Set – the entire pair of rows this is certainly came back by a specific choose statement.
Rollback – a surgical procedure, frequently done because of the SQL ROLLBACK statement, that discards all the modifications produced by all INSERT, IMPROVE and DELETE statements which have been performed because the most recently started deal ( ag e.g., BEGIN DEAL declaration).
Line – One pair of related values for many associated with the columns declared in a offered dining dining table. Also referred to as an archive event.
Royalty – A License charge established in a Agreement (Product and Pricing Addendum).