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What Is Partitioning
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A partition is simply a smaller segment of a database object When you partition an object, you break it into smaller pieces, based on the value of a partition key, which consists of one or more columns
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All SQL statements interact with the partitioned object as a single unified entity, but the Oracle optimizer is aware that an object is partitioned and how it is partitioned The optimizer uses this information to implement a strategy of partition pruning A query that needs to implement some type of selection, either with a predicate or a join, can simply avoid reading partitions whose partition key indicates that none of the data in the partition will pass the criteria In this way, the execution path can avoid accessing a large portion of an object, reducing the overall I/O requirements The performance gain, like the partition, is implemented transparently You can partition both tables and indexes with any of the partition methods that are described in the next section Three different relationships are possible between a partitioned table and an index, as shown in Figure 2-8
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The index and the partition can be partitioned on the same partition key This relationship, known as equipartitioning or a local index, means a separate portion of the index for each partition in the database If most of the queries running against your partitioned table will result in partition pruning, equipartitioning amplifies the benefits of this approach An index could be global and partitioned on a different partition key than the associated table This scheme will deliver benefits for some queries where the index partition key can be used for partition pruning, and other benefits for queries where the table partition key can be used An index can also be global and unpartitioned, and the table is partitioned Although this relationship may not produce as large a benefit as equipartitioning, some types of random access will work better this way, as a global index can be accessed with a single read rather than having to probe each index partition
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Partitioning provides benefits by dividing up a larger table into smaller portions, based on the value of the partition key A table or index can only be partitioned once at the top level, of course, since partitioning dictates the logical storage of the object, but the partitioning scheme used must correspond with the way that a query will be requesting data in order to provide performance benefits Because of this, Oracle has continually expanded the ways that you can partition tables since the introduction of this feature with Oracle 8
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Oracle 11g Enterprise Edition Features
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Index Partition
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Index Partition
Index Partition
Index Partition
Partition Q1
Partition Q2
Partition Q3
Partition Q4
SALES07 Table Equipartitioned index
Global Index
Partition Q1
Partition Q2
Partition Q3
Partition Q4
SALES07 Table Global index
FIGURE 2-8
Index and table partitioning
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Oracle Database 11g Release 2, the current release of the database at the time of this writing, supports the following types of partitioning:
Hash The partition key for hash partitions is created by running a hash function on the designated partition column The hash calculation is used to ensure an even distribution among partitions, even when the distribution of the actual values of the partition column is uneven A hash-partitioned table cannot use partition pruning when the selection criteria include a range of values Range Range partitioning uses the actual value of the partition key to create the partitions Range partitioning is described with a low value and a high value for the partition key, although you can have one partition without a low value for all values lower than the specific value and one partition without a high value for a similar function at the high end Range partitions can be used for partition pruning with a range of values, either specified or implied through the use of the LIKE operator List In a list partition, you assign a specific list of values for a partition key to indicate membership in a partition The list partition is designed for those situations where a group of values are linked without being consecutive, such as the states or territories in a sales region List partitions can be used for partition pruning with the LIKE operator Composite Composite partitioning is a way of adding a subpartition to a table, giving the table two levels of partitioning, as shown in Figure 2-9 Composite partitioning allows Oracle to go directly to a partition with specific values in two dimensions With Oracle Database 11g, you can have any mix of composite partitions that include range, hash, or list partitions Interval An interval partition is a way to reduce the maintenance overhead for range partitions that use a date or number as the partition key For an interval partition, you define the interval that specifies the boundaries of a partition The Oracle Database will subsequently create partitions as appropriate without any further intervention If the value for a partition key requires a new partition to be created, that operation is performed automatically You can
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