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* Query language enhancements including "INSERT/UPDATE/DELETE RETURNING", multirow VALUES lists, and optional target-table alias in "UPDATE"/"DELETE" * Index creation without blocking concurrent "INSERT"/"UPDATE"/"DELETE" operations * Many query optimization improvements, including support for reordering outer joins * Improved sorting performance with lower memory usage * More efficient locking with better concurrency * More efficient vacuuming * Easier administration of warm standby servers * New FILLFACTOR support for tables and indexes * Monitoring, logging, and performance tuning additions * More control over creating and dropping objects * Table inheritance relationships can be defined for and removed from pre-existing tables * "COPY TO" can copy the output of an arbitrary "SELECT" statement * Array improvements, including nulls in arrays * Aggregate-function improvements, including multiple-input aggregates and SQL:2003 statistical functions * Many "contrib/" improvements
9 lines
441 B
Text
9 lines
441 B
Text
PostgreSQL is a robust, next-generation, Object-Relational DBMS (ORDBMS),
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derived from the Berkeley Postgres database management system. While
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PostgreSQL retains the powerful object-relational data model, rich data types
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and easy extensibility of Postgres, it replaces the PostQuel query language
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with an extended subset of SQL.
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PostgreSQL is free and the complete source is available.
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This package contains the database client programs.
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