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 exact same information. Often called a “snapshot.”
Real-time – a environment that is real-time one by which particular tasks must certanly be going to perform in just a specified time period. For a DBMS to be viewed really real-time, it should be in a position to perform particular database-related tasks in a period that may be deterministically demonstratedвЂ”i.e., the case execution time that is worst may be demonstrated. Just because a general-purpose DBMS addresses dynamic information where the sizes of tables differ as time passes, and since DBMS response times rely on the quantity of information become prepared they can not be looked at real-time. That is real additionally for RDM. It really is 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 particular record typeвЂ”equivalent to an SQL row.
Record Type – an accumulation closely associated information fieldsвЂ”equivalent to an SQL table. Comparable to a C struct, an archive kind is defined by a collection of closely associated information areas.
Referential Integrity – an ailment in which the international key column values in most associated with the rows in a single dining table have actually matching rows when you look at the referenced primary table that is key. Referential integrity is maintained by SQL through the processing of a INSERT and DELETE declaration and any UPDATE statement that modifies a foreign 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 associated with the main key dining table and another or even more rows associated with the matching international key table. Equi-joins relate tables which have matching primary/foreign values that are key but other evaluations (relationships) can be defined. As well as explaining the way the database tables are associated, the relational model additionally describes just how the associated information is accessed and manipulated. SQL is one of widely used relational model database language. See Wikipedia
Remote Procedure Phone – an approach of interprocess interaction the place where a function living within another procedure is named as if it’s a regional (in-process) function. The strategy is implemented through a nearby proxy function and a stub function that is remote. Parameter values are marshalled into a block of information which can be sent through the proxy towards the stub for demarshalling and calling the function that is actual. Return values are prepared when you look at the way that is same input values.
Replication – a process where chosen adjustments in a master database is replicated re-played that is( into another database.
Regulation Factor – Each relational phrase specified into the WHEREIN clause of a question has an associated limitation component that is approximated because of the SQL optimizer, which specifies the fraction (or portion) regarding the dining table which is why the phrase is going to be real. For instance, within the query choose * from book where bookid = ‘austen013px’ the relational phrase bookid = ‘austen013px’ includes a limitation factor datingmentor.org/escort/abilene/ add up to .003 (just one out of 3213px rows will satisfy this phrase).
Result Set – The complete pair of rows this is certainly came back by A select that is particular statement.
Rollback – a procedure, frequently done because of the SQL ROLLBACK statement, that discards all the modifications produced by all INSERT, MODIFY and DELETE statements which have been performed considering that the most recently started deal ( ag e.g., BEGIN TRANSACTION statement).
Line – One group of relevant values for many for the columns declared in an offered dining dining dining table. Also referred to as a record event.
Royalty – A License cost established in an Agreement (Product and Pricing Addendum).