January 2019
Beginner
556 pages
14h 19m
English
Content preview from Learning PostgreSQL 11 - Third Edition
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PostgreSQL utility tools
Several PostgreSQL utility tools are wrappers around SQL constructs. These tools are used to create and drop databases, users, and languages. For example, the dropdb and createdb commands are wrappers around DROP DATABASE [ IF EXISTS ] and CREATE DATABASE, respectively.
PostgreSQL also provides tools to maintain the system objects, mainly clusterdb and reindexdb. clusterdb is a wrapper around the CLUSTER statement, which is used to physically reorder the table based on certain index information. This can increase database-performance read operations due to the locality of reference principles, mainly the spatial locality. Clustering the table helps to retrieve data from adjacent storage blocks and thus reduces the ...
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