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Oracle 8 Tips  

by Burleson Consulting

The Data Warehouse Development Life Cycle

Parallelism And Oracle Data Warehousing

Freelists And Oracle Parallel Server Contention

Listing 7.1 Table definition--Example 1.

CREATE TABLE ORDER (
order_nbr number,
order_date date)
STORAGE ( PCTFREE 10 PCTUSED 40 FREELISTS 3);


Here, we can infer that the table has very few updates that cause the row length to increase because PCTFREE is only 10 percent. We can also infer that this table will have a great deal of delete activity, because PCTUSED is at 40 percent, thereby preventing immediate reuse of database blocks as rows are deleted. This table must also have a lot of insert activity, because FREELISTS is set to three, indicating that up to three concurrent processes will be inserting into the table.

Listing 7.2 Table definition--Example 2.

CREATE TABLE ITEM (
item_nbr number,
item_name varchar(20),
item_description varchar(50),
current_item_status varchar(200) )
STORAGE ( PCTFREE 10 PCTUSED 90 FREELISTS 1);

Here, we can infer that update operations are frequent and will probably increase the size of the varchar columns, because PCTFREE is set to reserve 10 percent of each block for row expansion. We can also infer that this table has few deletes, because PCTUSED is set to 90, making efficient use of the database blocks. Assuming that there will not be very many deletes, these blocks would become constantly re-added to the freelist.


This is an excerpt from "High Performance Data Warehousing", copyright 1997. To learn more about Oracle, try "Oracle Tuning: The Definitive Reference", by Donald K. Burleson.  You can buy it direct from the publisher at 30% off here:
http://www.rampant-books.com/book_1002_oracle_tuning_definitive_reference_2nd_ed.htm

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