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Composite Range-List Partitioning
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In the range-list-partitioning method, you first partition the data based on a range of values. You then use list partitioning to break up the first set of partitions, using a list of discrete values. Listing 5-11 shows an example of how to create a range-list-partitioned table. Listing 5-11. Creating a Range-List-Partitioned Table SQL> 2 3 4 5 6 7 8 9 CREATE TABLE quarterly_regional_sales (ticket_no NUMBER, sale_year INT NOT NULL, sale_month INT NOT NULL, sale_day DATE, destination_city CHAR(3), start_city CHAR(3)) PARTITION BY RANGE(sale_day) SUBPARTITION BY LIST (start_city)
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CHAPTER 5 SCHEMA MANAGEMENT
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10 (PARTITION q1_2004 VALUES LESS THAN (TO_DATE('1-APR-2004','DD-MON-YYYY')) 11 TABLESPACE t1 12 (SUBPARTITION q12004_northeast_sales VALUES ('NYC','BOS','PEN'), 13 SUBPARTITION q12004_southwest_sales VALUES ('DFW','ORL','HOU'), 14 SUBPARTITION q12004_pacificwest_sales VALUES ('SAN','LOS','WAS'), 15 SUBPARTITION q12004_southeast_sales VALUES ('MIA','CHA','ATL') 16 ), 17 PARTITION q2_2004 VALUES LESS THAN (TO_DATE('1-JUL-2004','DD-MON-YYYY')) 18 TABLESPACE t2 19 (SUBPARTITION q22004_northeast_sales VALUES ('NYC','BOS','PEN'), 20 SUBPARTITION q22004_southwest_sales VALUES ('DFW','ORL','HOU'), 21 SUBPARTITION q22004_pacificwest_sales VALUES ('SAN','LOS','WAS'), 22 SUBPARTITION q22004_southeast_sales VALUES ('MIA','CHA','ATL') 23 ), 24 PARTITION q3_2004 VALUES LESS THAN (TO_DATE('1-OCT-2004','DD-MON-YYYY')) 25 TABLESPACE t3 26 (SUBPARTITION q32004_northeast_sales VALUES ('NYC','BOS','PEN'), 27 SUBPARTITION q32004_southwest_sales VALUES ('DFW','ORL','HOU'), 28 SUBPARTITION q32004_pacificwest_sales VALUES ('SAN','LOS','WAS'), 39 SUBPARTITION q32004_southeast_sales VALUES ('MIA','CHA','ATL') 30 ), 31 PARTITION q4_2004 VALUES LESS THAN (TO_DATE('1-JAN-2005','DD-MON-YYYY')) 32 TABLESPACE t4 33 (SUBPARTITION q42004_northeast_sales VALUES ('NYC','BOS','PEN'), 34 SUBPARTITION q42004_southwest_sales VALUES ('DFW','ORL','HOU'), 35 SUBPARTITION q42004_pacificwest_sales VALUES ('SAN','LOS','WAS'), 36 SUBPARTITION q42004_southeast_sales VALUES ('MIA','CHA','ATL') 37 ) 38* ); Table created. SQL> A total of 16 subpartitions will be created in the range-list-partitioned table created in Listing 5-11, with four subpartitions in each tablespace (t1, t2, t3, t4). Each time you insert a row of data into the quarterly_regional_sales table, Oracle will first check whether the value of the partitioning column for a row falls within a specific partition range. Oracle will then map the row to a subpartition within that partition, by mapping the subpartition column value to the appropriate subpartition based on the values in the subpartition s list. For example, the row with the column values (9999, 2004, 10, 1, 'DAL', 'HOU') maps to subpartition q32004_southwest_sales.
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Partition Maintenance Operations
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After you initially create partitioned tables, you can perform a number of maintenance operations on the partitions. For example, you can add and drop partitions to maintain a fixed number of partitions based on a quarterly time period. In this section, I illustrate the use of these maintenance operations by assuming a rangepartitioning scheme. These maintenance operations apply to all types of partitioning schemes, with a few exceptions, like the following: Range and list partitions can t be coalesced. Hash partitions can t be dropped, split, or merged. Only list partitions allow the modification of partitions by adding and dropping the partition values.
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You can add a new partition to the ticket_sales table to include a new quarter, as follows: SQL> ALTER TABLE ticket_sales ADD PARTITION sales_quarter5 VALUES LESS THAN (TO_DATE('1-JAN-2005','DD-MON-YYYY')) TABLESPACE ticket_sales05; This example adds a new quarterly partition for the first quarter of the year 2005, which comes after the last quarter in the original table.
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The ADD PARTITION statement will add partitions only to the upper end of the existing table. But what if you need to insert some new data into the middle of a table What if an existing partition becomes too large, and you would rather have smaller partitions Splitting a partition takes the data in an existing partition and distributes it between two partitions. You can use the SPLIT PARTITION clause to break up a partition, as shown here: SQL> ALTER TABLE ticket_sales SPLIT PARTITION ticket_sales01 AT (2000) INTO (PARTITION ticket_sales01A, ticket_sales01B);
Merging Partitions
You can use the MERGE PARTITIONS command to combine the contents of two adjacent partitions. For example, you can merge the first two partitions of the ticket_sales table in the following way: SQL> ALTER TABLE ticket_sales MERGE PARTITIONS ticket_sales01, ticket_sales02 INTO PARTITION ticket_sales02;
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