As discussed in the previous sections, Citus is an extension which extends the latest PostgreSQL for distributed execution. At a high level, Citus partitions the SELECT query into smaller query fragments, assigns these query fragments to workers, oversees their execution, merges their results and orders them if needed , and returns the final result to the user. Citus supports and parallelizes most aggregate functions supported by PostgreSQL, including custom user-defined aggregates. Aggregates execute using one of three methods, in this order of preference:.
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Join Stack Overflow to learn, share knowledge, and build your career. Connect and share knowledge within a single location that is structured and easy to search. As as simplified alternative to the currently accepted answer , the UNIQUE constraint can be anonymously added upon creation of the table:. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams?
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Join Stack Overflow to learn, share knowledge, and build your career. Connect and share knowledge within a single location that is structured and easy to search. I have a table in oracle size about million records gb on top we are getting about 2 -3 million records as source flatfile.