White Papers

On Loading and Extents

Category: Data Management, Software and Web Development

Overview Parallel DDL and operations such as a direct path load via SQL*Loader rely on direct path operations. That is, the data is not passed to the buffer cache to be written later; rather, an operation such as a CREATE TABLE AS SELECT will create new extents and write directly to them, and the data goes straight from the query to disk in those newly allocated extents. Each parallel execution server performing its part of the CREATE TABLE AS SELECT writes to its own extent. The INSERT /+ APPEND / (a direct path insert) writes above a segment's High-Water Mark (HWM), and each parallel execution server again writes to its own set of extents, never sharing them with other parallel execution servers.

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Publisher: Oracle
File Format: HTML
Date Published: May 1, 2007
Format: White Papers
Topics: Programming Languages, Database Management

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