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https://stackoverflow.com/questions/11238642/not-exists-clause-in-postgresql
When I execute such query, postgresql complains "ERROR: Greenplum Database does not yet support that query." EDIT: And how about this one: SELECT * FROM tabA WHERE NOT EXISTS ( SELECT * FROM tabB WHERE tabB.id = tabA.id AND tabB.id2 = tabA.id2 ) EDIT: I tested in postgresql 8.2.15 for the 4 answers provided by @ypercube. Conclusions are:
Innovative Query Optimization. The query optimizer available in Greenplum Database is the industry’s first cost-based query optimizer for big data workloads. It can scale interactive and batch mode analytics to large datasets in the petabytes without degrading query performance and throughput.
https://greenplum.org/gpdb-sandbox-tutorials/introduction-greenplum-database-architecture/
Greenplum Database stores and processes large amounts of data by distributing the data and processing workload across several servers or hosts. Greenplum Database is an array of individual databases based upon PostgreSQL 8.2 working together to present a single database image. The master is the entry point to the Greenplum Database system.
https://gpdb.docs.pivotal.io/6-0/admin_guide/intro/about_mvcc.html
A query operates on a snapshot of the database at the start of the query. A snapshot is the set of rows that are visible at the beginning of a statement or transaction. ... which Greenplum Database does not fully support ... Every page in the table is checked, and visible rows are moved up into pages which are not yet fully packed. Empty pages ...
https://gpdb.docs.pivotal.io/500/admin_guide/intro/arch_overview.html
The internals of PostgreSQL have been modified or supplemented to support the parallel structure of Greenplum Database. For example, the system catalog, optimizer, query executor, and transaction manager components have been modified and enhanced to be able to execute queries simultaneously across all of the parallel PostgreSQL database instances.
http://gpcc.docs.pivotal.io/470/topics/ui/query-details.html
If the estimate is greater than 100% and the query has not yet completed, 99.9% completion is reported. 100% is reported if the formula produces an estimated percentage greater than 100%. CPU Master Current CPU percent on the Greenplum Database master host for this query…
https://github.com/greenplum-db/gpdb/wiki/Greenplum-Database-project-contributions-FAQ
Jun 22, 2017 · Greenplum Database project contributions FAQ. ... Uniquely geared toward big data analytics, Greenplum Database is powered by the world’s most advanced cost-based query optimizer, delivering high analytical query performance on large data volumes. ... To ensure that the use of the Greenplum Database Trademarks will not lead to confusion, ...
https://gpcc.docs.pivotal.io/470/topics/ui/query-monitor.html
The Query Monitor view allows you to view information for all Greenplum Database server queries, including details about queries running, queued to run, and blocked by other queries. Users with Admin or Operator permission can see and cancel all users’ queries. If a Command Center administrator has enabled Query Monitor Guest Access, anyone able to access the Command Center web server can ...
https://sites.google.com/a/greenplumdba.com/gpdb/command-center-database-reference
This is a transitional table for query workload data that has been cleared from database_now but has not yet been committed to database_history. ... component, or a Greenplum Database instance startup. Once an ConnectEMC event is triggered, an alert is sent to EMC Support. ... The tables in this section list all possible iterators in a query on ...
https://2ndquadrant.in/courses/it-software/databases/greenplum-database/lessons/greenplum-database-architecture-2/
Greenplum Database segment instances are independent PostgreSQL databases that each store a portion of the data and perform the majority of query processing. When a user connects to the database via the Greenplum master and issues a query, processes are created in each segment database to handle the work of that query.
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