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PostgreSQL (/ ˌ p oʊ s t ɡ r ɛ s k j u ˈ ɛ l / POHST-gres-kew-EL) [12] [13] also known as Postgres, is a free and open-source relational database management system (RDBMS) emphasizing extensibility and SQL compliance.
Ingres Database (/ ɪ ŋ ˈ ɡ r ɛ s / ing-GRESS) is a proprietary SQL relational database management system intended to support large commercial and government applications.. Actian Corporation, which announced April 2018 that it is being acquired by HCL Technologies, [2] controls the development of Ingres and makes certified binaries available for download, as well as providing worldwide ...
Materialized view. In computing, a materialized view is a database object that contains the results of a query. For example, it may be a local copy of data located remotely, or may be a subset of the rows and/or columns of a table or join result, or may be a summary using an aggregate function. The process of setting up a materialized view is ...
Features. Legend. User Interface: Browser based - executes on a computer server and is accessed via a network using a web browser. desktop - executes on a personal computer. Create/alter table: Yes - can create table, alter its definition and data, and add new rows.
Website. greenplum.org. Greenplum is a big data technology based on MPP architecture and the Postgres open source database technology. The technology was created by a company of the same name headquartered in San Mateo, California around 2005. Greenplum was acquired by EMC Corporation in July 2010. [1]
Data definition language. Saving a ddl file in Oracle SQL Developer. In the context of SQL, data definition or data description language (DDL) is a syntax for creating and modifying database objects such as tables, indices, and users. DDL statements are similar to a computer programming language for defining data structures, especially database ...
Adaptive replacement cache. Adaptive Replacement Cache ( ARC) is a page replacement algorithm with better performance [1] than LRU (least recently used). This is accomplished by keeping track of both frequently used and recently used pages plus a recent eviction history for both. The algorithm was developed [2] at the IBM Almaden Research Center.
View (SQL) In a database, a view is the result set of a stored query that presents a limited perspective of the database to a user. [1] This pre-established query command is kept in the data dictionary. Unlike ordinary base tables in a relational database, a view does not form part of the physical schema: as a result set, it is a virtual table ...