In-depth understanding of the relationship between Oracle table (4) and segments
Source: Internet
Author: User
Table It is a segment, but the segment is not necessarily a table, and the segment also has the index segment, undo segment, partition and so on.
The details are as follows:
First, we need to understand their concept: tables are logical objects; segments are physical storage objects.
Then, let's look at the relationship between them:
The existence of segment ① does not depend on the table. Other logical objects, such as indexes and materialized views, will also be created.
② A common table (heap organization table) corresponds to a segment
③ Creating a table does not mean creating segments, such as a temporary table)
④ A table can also create multiple segments, such as a partition table)
⑤ Multiple tables can coexist in one segment, for example, cluster table)
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