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. Usually described as a “snapshot.”
Real-time – a environment that is real-time one for which certain tasks must certanly be guaranteed in full to perform within a specified time period. For a DBMS to be viewed undoubtedly real-time, it should be in a position to perform certain database-related tasks in a period that may be deterministically demonstratedвЂ”i.e., the worst situation execution time are demonstrated. Just because a general-purpose DBMS addresses dynamic data where the sizes of tables differ with time, and since DBMS reaction times be determined by the total amount of information become prepared they can’t be looked at real-time. This might be real additionally for RDM. It’s real-time friendly, since it is fast, has a little footprint and it has features (such as for example digital tables and in-memory storage space) that enable that it is found in useful means in a real-time application.
Record Instance/Occurrence – One group of associated information industry values connected with a specific record typeвЂ”equivalent to an SQL row.
Record Type – an accumulation of closely associated information fieldsвЂ”equivalent to an SQL table. Much like a C struct, accurate documentation kind is defined by a collection of closely associated information industries.
Referential Integrity – a disorder when the international key column values in every for the rows in a single dining dining table have actually matching rows when you look at the referenced primary table that is key. Referential integrity is maintained by SQL throughout the processing of an INSERT and DELETE statement and any UPDATE statement that modifies an international or primary key value.
Relational Model – A database by which inter-table relationships are arranged mainly through typical information columns, which define a one-to-many relationship between a line regarding the main key dining table plus one or higher rows associated with matching foreign table that is key. Equi-joins relate tables which have matching primary/foreign values that are key but other comparisons (relationships) could be defined. As well as explaining the way the database tables are associated, the relational model additionally describes just how a associated data may be accessed and manipulated. SQL is considered the most widely used relational model database language. See Wikipedia
Remote Procedure Phone – a technique of interprocess interaction the place where a function living within another procedure is named as though it’s a regional (in-process) function. The strategy is implemented through an area proxy function and a remote stub function. Parameter values are marshalled right into a block of information which can be sent through the proxy towards the stub for demarshalling and calling the real function. Return values are prepared when you look at the in an identical way as input values.
Replication – a procedure where chosen changes in a master database is replicated re-played that is( into another database.
Regulation Factor – Each expression that is relational into the WHEREIN clause of a question has an associated limitation component that is predicted because of the SQL optimizer, which specifies the small fraction (or portion) regarding the dining dining table which is why the phrase is going to be real. For instance, when you look at the query choose * from book where bookid = ‘austen013px’ the expression that is relational = ‘austen013px’ features a limitation element corresponding to .003 (just one away from 3213px rows will satisfy this phrase).
Result Set – the entire collection of rows that is came back by A select that is particular statement.
Rollback – a procedure, often done because of the SQL ROLLBACK statement, that discards all the modifications created by all INSERT, MODIFY and DELETE statements which have been performed considering that the most recently started deal ( e.g., BEGIN DEAL declaration).
Line – One pair of https://datingmentor.org/escort/surprise/ associated values for many for the columns declared in an offered dining dining table. Also referred to as an archive incident.
Royalty – A License charge established in an Agreement (Product and Pricing Addendum).