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CHAPTER 13 PARTITIONING
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Composite Partitioning
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Lastly, we ll look at some examples of composite partitioning, which is a mixture of range, hash, and/or list. The methods by which you can composite partition, that is the types of partitioning schemes you can mix and match, varies by release. Table 13-1 lists what is available in each of the major releases. The partitioning scheme listed down the table is the top level partitioning scheme permitted, whereas as the partitioning scheme listed across the table is the subpartition the partition within the partition scheme. Table 13-1. Oracle Database Supported Composite Partitioning Schemes by Version
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So, for example, in Oracle 9i Release 2 and later you can partition a table by RANGE and then within each range partition, by LIST or HASH. Starting in Oracle Database 11g Release 1 and above, you go from two composite schemes to six. And in Oracle Database 11g Release 2 and later, you have nine to choose from. It is interesting to note that when you use composite partitioning, there will be no partition segments; there will be only subpartition segments. When using composite partitioning, the partitions themselves do not have segments (much like a partitioned table doesn t have a segment). The data is physically stored in subpartition segments and the partition becomes a logical container, or a container that points to the actual subpartitions. In our example, we ll look at a range-hash composite. Here, we are using a different set of columns for the range partition from those used for the hash partition. This is not mandatory; we could use the same set of columns for both: ops$tkyte%ORA11GR2> CREATE TABLE composite_example 2 ( range_key_column date, 3 hash_key_column int, 4 data varchar2(20) 5 ) 6 PARTITION BY RANGE (range_key_column) 7 subpartition by hash(hash_key_column) subpartitions 2 8 ( 9 PARTITION part_1 10 VALUES LESS THAN(to_date('01/01/2008','dd/mm/yyyy')) 11 (subpartition part_1_sub_1, 12 subpartition part_1_sub_2 13 ), 14 PARTITION part_2 15 VALUES LESS THAN(to_date('01/01/2011','dd/mm/yyyy')) 16 (subpartition part_2_sub_1, 17 subpartition part_2_sub_2 18 ) 19 ) 20 / Table created.
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CHAPTER 13 PARTITIONING
In range-hash composite partitioning, Oracle will first apply the range partitioning rules to figure out which range the data falls into. Then it will apply the hash function to decide into which physical partition the data should finally be placed. This process is described in Figure 13-4.
Figure 13-4. Range-hash composite partition example So, composite partitioning gives you the ability to break your data up by range and, when a given range is considered too large or further partition elimination could be useful, to break it up further by hash or list. It is interesting to note that each range partition need not have the same number of subpartitions; for example, suppose you were range partitioning on a date column in support of data purging (to remove all old data rapidly and easily). In the year 2007 and before, you had equal amounts of data in odd code numbers in the CODE_KEY_COLUMN and in even code numbers. But after that, you knew the number of records associated with the odd code number was more than double, and you wanted to have more subpartitions for the odd code values. You can achieve that rather easily just by defining more subpartitions: ops$tkyte%ORA11GR2> CREATE TABLE composite_range_list_example 2 ( range_key_column date, 3 code_key_column int, 4 data varchar2(20) 5 ) 6 PARTITION BY RANGE (range_key_column) 7 subpartition by list(code_key_column) 8 ( 9 PARTITION part_1 10 VALUES LESS THAN(to_date('01/01/2008','dd/mm/yyyy'))
CHAPTER 13 PARTITIONING
11 (subpartition part_1_sub_1 values( 1, 3, 5, 7 ), 12 subpartition part_1_sub_2 values( 2, 4, 6, 8 ) 13 ), 14 PARTITION part_2 15 VALUES LESS THAN(to_date('01/01/2011','dd/mm/yyyy')) 16 (subpartition part_2_sub_1 values ( 1, 3 ), 17 subpartition part_2_sub_2 values ( 5, 7 ), 18 subpartition part_2_sub_3 values ( 2, 4, 6, 8 ) 19 ) 20 ) 21 / Table created. Here you end up with five partitions altogether: two subpartitions for partition PART_1 and three for partition PART_2.
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